Tigercat M726D MULCHER SERVICE MANUAL - PDF DOWNLOAD

SERVICE MANUAL Tigercat M726D MULCHER ISSUE 1.0, MARCH, 2006

TABLE OF CONTENTS SECTION INTRODUCTION ................................................................................................. III SAFETY ............................................................................................................... 1 USING HIGH SPEED DISC SAWS SAFELY ............. APPENDIX TO SECTION 1 CONTROLS AND OPERATION ........................... SEE OPERATOR'S MANUAL LUBRICATION AND MAINTENANCE ................................................................. 3 PILOT SYSTEM ................................................................................................... 5 ELECTRICAL, GAUGES AND ALARMS ............................................................. 6 ENGINE ............................................................................................................... 7 DRIVE .................................................................................................................. 8 BRAKES AND DIFFERENTIAL LOCKS .............................................................. 9 OIL COOLER, RADIATOR AND CROSS-FLOW FAN ...................................... 10 STEERING ......................................................................................................... 11 LIFT BOOM ........................................................................................................ 12 TILT .................................................................................................................... 13 SAW DRIVE ....................................................................................................... 17 CLAMPS WITH SAW ......................................................................................... 18 MULCH DEFLECTOR DOOR ............................................................................ 19 M726DSM00

M726D Available Literature Operator's Manual .................................................. Part No. 24259A Service Manual (This Manual) .............................. Part No. 24260A Parts Catalog .......................................................... Part No. 24258A

Tigercat

®

Tigercat Industries Inc. P.O. Box 544 Paris, Ontario Canada N3L 3T6 Tel: (519) 442-1000 Fax: (519) 442-1855

Tigercat M726D Mulcher

Introduction

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Tigercat M726D Mulcher Tigercat M726D Mulcher

Introduction

INTRODUCTION An Operator's manual, Service manual and a Parts catalog are made available by Tigercat to assist the dealer, customer and operator in becoming familiar with the features of the M726D Mulcher serial number 726M3001 and up.

The operator's manual will assist the operator with the techniques of proper and safe operation of the M726D Mulcher. There is also important information regarding the safe operation of the mulching head.

The service manual contains safety and servicing procedures and a preventive maintenance schedule to ensure optimum machine performance.

Section 1 in both the operator's manual and the service manual contains safety information that must be followed. As well, throughout the rest of the manuals, WARNING and CAUTION notices are displayed where necessary, drawing attention to possible hazards when performing certain procedures.

Only trained personnel should be allowed to operate or work on the machine.

The information contained in this manual is current at time of printing. Improvements to the machine are on-going and may not be covered, therefore in these cases contact your Tigercat dealer for the appropriate information.

The phrase “and up” appearing in this manual after the serial number implies that the related information is current for any machine serial number HIGHER than the serial number preceding the “and up”.

Tigercat reserves the right to make changes to the machine after this manual release date that may not immediately appear in this manual.

Every effort is made to send out updates on a regular basis. If the machine in question was built after the release date of this manual and there is a discrepancy, call Tigercat service department. The release date appears on the first page.

The Company reserves the right to change information contained herein at any time without prior notice.

Tigercat Industries Inc.

726M-007

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Tigercat M726D Mulcher

Introduction

S.A.E. STANDARDS ROLL-OVER PROTECTION STRUCTURES (ROPS) FALLING OBJECTS PROTECTION STRUCTURES (FOPS) OPERATOR PROTECTION STRUCTURES (OPS) * MODIFICATIONS AND REPAIRS: The integrity of the ROPS, FOPS, OPS structure and its continued ability to provide the level of protection it was designed for could be seriously affected by any modifications to the structure, its mounting or to the chassis to which it is attached.

Tigercat emphasizes that the certification of approval of the ROPS, FOPS, OPS structure will become void if any such modifications take place.

Tigercat may officially grant approval for modifications only by: i.

Written approval of repairs or modifications signed by the Tigercat Engineering Manager; or

ii.

Approved modifications officially released by Tigercat.

Both of the above are provided that the work is carried out in the factory approved manner.

Unauthorized modifications and/or repairs made or contributed to by a customer or a Tigercat distributor may result in creating a dangerous situation and therefore the customer or Tigercat distributor will be considered to have assumed the risk involved or be negligent in creating this situation.

Tigercat will not be held responsible for situations arising from having created unauthorized modifications/changes to the structure.

Operator's cabs are designed to ROPS, FOPS, OPS standards so that they will withstand force and absorb energy during a roll-over (ROPS), when resisting the impact of a falling object (FOPS) and minimize the possibility of operator injury from penetrating objects (OPS). When a permanent deflection of the structure occurs, the structure can no longer provide the original designed level of protection and should be replaced. Attempts to straighten the structure, particularly by the application of heat, can reduce still further the structures remaining capability to protect.

The mounting and the frame or chassis to which the cab is attached is considered an integral part of the ROPS, FOPS, OPS and is included in the design, test and certification of the product.

Contact the Tigercat Service department before attempting any modifications or repair to roll-over protective structures.

Tigercat Industries Inc.

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Tigercat M726D Mulcher

Introduction

NON-APPROVED FIELD PRODUCT CHANGES The installation of any unauthorized attachment or changes made of any kind to this Tigercat product could affect the product's ability to perform as originally intended. The product's integrity, stability and it's ability to perform safely could be at serious risk.

IT IS Tigercat POLICY THAT NO CHANGES ARE TO BE MADE TO ITS PRODUCTS INCLUDING DELETIONS OR ADDITIONS OTHER THAN A Tigercat APPROVED OPTION FITTED IN THE FACTORY APPROVED MANNER. Official approval to make changes or install options is only to be undertaken as follows: i) The relevant options for that product must be shown or listed on current Tigercat documentation or literature such as a printed specification sheet, price list, parts manual, or product literature issued by Tigercat. ii) Approved options or product changes authorized in writing by the Tigercat Engineering Manager.

AUTHORIZATION BY ANY OTHER PERSON IS UNACCEPTABLE. Unauthorized changes made or contributed to by a person or organization may result in creating a dangerous situation and therefore the person or organization will be considered to have assumed the risk involved or be negligent in having created this situation.

Weight is an important factor when considering the addition of options or an attachment, Refer to your Tigercat distributor for information on maximum permissible operating weight and the effect the addition of various options may have on your machine.

Tigercat will not be held responsible for any situation that may arise resulting from Non-approved Field Product Changes to its product.

Should Tigercat become involved in a dispute resulting from changes made to the product without proper authorization by Tigercat as stated above, Tigercat will take whatever action is appropriate to protect its interests.

The product warranty policy and the certification on any safety items installed on the modified product will become NULL and VOID if the above policy is not adhered to as specified.

Non-approved product changes also nullify warranties given to Tigercat by its component manufacturers.

Tigercat Industries Inc.

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Introduction

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Tigercat M726D Mulcher SECTION 1 - SAFETY MARCH, 2006

Read and understand this safety section prior to operating any equipment.

Read and understand all manuals for any attachments or accessories.

CONTENTS - SECTION 1 BOOM LIFT LOCK ........................................................................................ 1.14 CAB EXITS ..................................................................................................... 1.9 EMERGENCY CAB EXITS .............................................................................. 1.9 ENGINE ACCESS PANELS ......................................................................... 1.15 FIRE PREVENTION ...................................................................................... 1.16 FIRE PREVENTION GUIDELINES ............................................................. 1.16 WHAT ELSE TO DO BEFORE YOU EXPERIENCE A FIRE ...................... 1.17 WHAT TO DO AFTER A FIRE ................................................................... 1.18 WHAT TO DO IN CASE OF A MACHINE FIRE .......................................... 1.17 HAZARD ZONE .............................................................................................. 1.3 MULCHING OPERATION SAFETY ............................................................... 1.10 PARKING THE MACHINE ............................................................................... 1.8 SAFETY INTERLOCK SWITCHES ON CAB DOORS ..................................... 1.9 SAFETY PRECAUTIONS, GENERAL ............................................................ 1.2 SAFETY PRECAUTIONS, OPERATING ......................................................... 1.6 SAFETY PRECAUTIONS, SERVICING ........................................................ 1.12 SAFETY SYMBOLS ....................................................................................... 1.2 SIGNAL WORDS ............................................................................................ 1.2

Tigercat M726D Mulcher

Safety

SAFETY SYMBOLS

GENERAL SAFETY PRECAUTIONS Remember that safety is a prime responsibility of all.

To minimize the risks and promote safety at all times, this section of the operator’s manual details a number of safety rules which should always be followed and obeyed.

This safety alert symbol means ATTENTION! BECOME ALERT! YOUR SAFETY IS INVOLVED!

Always read the operator's manual before operating the machine. Pay close attention to WARNINGS and HAZARD identifications

The safety alert symbol identifies important safety messages on machines, safety signs, in manuals, or elsewhere. When you see this symbol, be alert to the possibility of personal injury or death. Follow the instructions in the safety message.

Understanding Signal Words

DANGER DANGER identifies the most serious hazards where failure to follow listed procedures would result in a high probability of death or serious injury.

Follow all instructions from safety inspector and supervisors.

You must be fully trained to operate this piece of equipment. Know the capabilities and the limitations of the equipment. Learn the most efficient operating techniques.

WARNING WARNING denotes a hazard exists which can result in serious injury or death if proper precautions are not taken.

Do not let an untrained person operate the machine.

CAUTION CAUTION is used in areas where failure to follow listed procedures may cause personal injury, component damage or subsequent malfunction.

IMPORTANT Use recommended protective clothing and safety devices such as orange safety vest, gloves, safety boots, safety hat, goggles, and ear protection when necessary. These safety rules highlight both general and specific measures the operator should be familiar with and adhere to. More specific measures are illustrated with pictograms which may also be attached to the machine in locations pertinent to their respective message. Keep safety labels in good condition. Repair or replace damaged labels.

IMPORTANT is used to focus attention on items that should be checked, controlled, adjusted or cleaned to ensure the efficiency and long term operation of the machine.

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Tigercat M726D Mulcher

Safety When approaching an operating machine on foot, stay at least 500 feet (150 meters) away until the operator recognizes your presence. Make sure that all equipment has been shut down before advancing to the machine.

GENERAL SAFETY PRECAUTIONS continued

KEEP BACK 500 FEET

DANGER ROTATING CUTTER

DANGER

The safety of persons outside the cab is the responsibility of the machine operator

Thrown debris keep back 500 feet.

The following diagram illustrates the HAZARD ZONE. All personnel should be kept clear of this zone while the attachment is operating.

500 FEET

Wear a suitable hearing protective device such as earmuffs or earplugs to protect against noise.

Prolonged exposure to loud noise can cause impairment or loss of hearing.

500 FEET

500 FEET

Use the handrails and steps provided when mounting and dismounting from the machine.

500 FEET

Do not climb onto or jump off the machine at any time.

Do not try to climb onto or off a moving machine.

M724D-03

Do not use the joystick(s) or steering wheel as a handle to assist entering or leaving the cab.

HAZARD ZONE

The HAZARD ZONE should be considered off limits to all individuals.

Do not use the machine foot controls as a step.

DANGER Danger caused by flying debris.

Improper operation of the attachment and failure to follow safety precautions can result in personal injury.

When mounting or dismounting the machine always use the 3 point technique - Use 1 hand with 2 feet or 2 hands with 1 foot.

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Tigercat M726D Mulcher

Safety

GENERAL SAFETY PRECAUTIONS continued Avoid mounting or dismounting the machine in areas with slippery surfaces. If this is not possible clean up or cover slippery surfaces with a nonslip material.

Keep a first aid kit in an easily accessible location on the vehicle at all times.

Safety Hazards - Viton Seals O-rings and other seals manufactured of Viton material produce a highly corrosive acid when subjected to temperatures above. 600°f (315°c).

This contamination can have extreme consequences on human tissue since it is almost impossible to remove after contact.

The following procedures are recommended when inspecting equipment that has been subjected to high temperatures such as fire:

Machines should be completely cleaned of debris at least daily, particularly around the engine exhaust components. Hydraulic oil leaks, excess grease, fuel and oil accumulation (including spillage) should be eliminated immediately.

Maintain a clean cab interior, clear away trash or debris.

•

Visually inspect any seals or gaskets which have suffered from heat; they will appear black and sticky.

•

If these are found, Do Not Touch!!!

•

Determine the material composition of any seals or gaskets, If fluoro-elastomer seals (Viton, fluorel, or tecmoflon) have been used, the affected area must be decontaminated before undertaking further work. Natural rubber and nitrile materials are not hazardous.

•

Disposable heavy duty gloves (neoprene) must be worn and the affected area decontaminated by washing thoroughly with limewater (Calcium Hydroxide solution).

•

Any cloths, residue and gloves must be safely discarded after use.

Machine should be washed completely before and after every major service.

Inspect the machine daily for signs of damage or unusual wear, to ROPS, FOPS, OPS structures.

Check for fluid leaks, or faulty operation. Repair or replace malfunctioning parts and systems immediately.

Check windows and door guards for damage.

Check protective windows for cracks, a damaged window has reduced strength to stop flying objects.

Check windows for scratching, crazing and cloudiness that could impair clear visibility all round the machine.

NOTE: Burning discarded items is not recommended except in an approved incineration process where the dangerous products are treated by alkaline scrubbing.

Do not operate the machine with any defective or inoperable components.

Check all fluid levels.

Do not operate the machine with any of the exhaust system, safety covers, or other devices removed.

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Tigercat M726D Mulcher

Safety WARNING WARNING

GENERAL SAFETY PRECAUTIONS continued

Engine exhaust, some of its constituents, and certain vehicle components contain or emit chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

Maintain a charged fire extinguisher on the vehicle at all times and KNOW HOW TO USE IT. Do not carry passengers either in the cab or anywhere else on the machine. The vehicle is provided and approved with seating for the operator only.

WARNING WARNING Battery posts, terminals and related accessories contain lead and lead compounds.

Wash hands after handling.

Do not allow anyone to operate the machine who may not be physically fit or who may be under the influence of alcohol or drugs.

When moving the machine, watch that enough clearance is available on both sides and above the machine or any of its attachments. Extra clearance may be required particularly where the ground is uneven.

Approach with extreme caution any area where overhanging electrical power lines are present.

Serious injury or death by electrocution can result if the machine or any of its attachments are not kept a safe distance from these lines.

Maintain a distance of 10 feet. (3 meters) between the machine or boom and any power line carrying up to 50,000 volts or less plus 1/2 inch (10 mm) for each additional 1,000 volts above the 50,000 volt level.

If State/Provincial, local or job site regulations require even greater safety distances than stated above, adhere strictly to these regulations for your own protection.

If the machine must be transported, make sure that it is adequately secured to the transporting vehicle.

Even though the brakes are fully engaged, block the wheels to prevent movement during transport.

Install the articulation lock bar when ever the machine is to be transported.

Comply with instructions in this manual and also your company’s regulations for the operation of this machine.

Read, understand and follow all general safety precautions specified by attachment manufacturer.

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Tigercat M726D Mulcher

Safety Prior to commencing work, check all equipment controls to ensure that the machine responds correctly.

OPERATING SAFETY PRECAUTIONS

Make sure that all safety screens and guards including the skylight are installed and properly secured.

Do not open an escape hatch or the cab doors to increase ventilation when operating the machine.

Shut off engine when refuelling - DO NOT refuel the engine while smoking or near open flame or sparks.

Check that no other personnel have moved into a hazardous area before starting the machine.

Sound the machine horn before starting the machine.

Keep the cab doors closed when driving or steering the machine to prevent accidental entry of branches and debris into the cab.

The operator’s seat is equipped with either a lap belt or lap and shoulder harness belts. Use either of these restraint systems at all times when operating the machine.

Keep the cab doors closed and use seat belt when driving or steering the machine to prevent being thrown from the operator's cab.

Never use the parking brake to slow down or stop the machine except in an emergency.

Keep the brake properly adjusted at all times.

Start the engine according to the instructions in this manual. Refer to OPERATING MACHINE in SECTION 2 of the OPERATOR'S MANUAL. Always rest the attachment on the ground when operation is stopped, regardless if the engine is running or shut off.

WARNING

Never use a liquid staring aid to start an engine.

Before moving the machine to the work site, check to ensure that all doors, panels, and access covers are installed properly and secured.

Machine operations should only be performed from the operator's seat.

Secure loose items in the cab.

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Tigercat M726D Mulcher

Safety

OPERATING SAFETY PRECAUTIONS continued

CAUTION Do not open cab doors or window screens when machine is on a slope. The doors and screens are heavy and could swing out with considerable force.

When working on slopes, travel straight up or down the slope to prevent roll-over.

NEVER travel across a STEEP slope or side hill:

When the engine is running, DO NOT allow anyone in areas of the machine where they may be crushed by moving components.

Boom supports encroach on cab door opening when machine is steered.

•

Do not run engine when persons are on steps or in doorway area.

•

Serious injury or death could result from crushing.

Maintain a safe operating distance between the machine and other personnel. Never operate the boom or attachment over the heads of bystanders.

Do not turn on cutter until machine is at cutting site.

Never travel near co-workers or other pieces of equipment with cutter turning.

Do not allow people or other pieces of equipment near the machine during operation.

Use only prearranged and approved signalling practices.

Operate the machine only from a seated position in the operator’s seat.

Watch for ground hazards such as metal debris, wire fencing or rocks.

When travelling position attachment and boom accordingly so as not to impair vision.

If vision is limited by dust, smoke, fog, rain or snow, stop the machine until visibility is restored.

1.7

•

If you travel across a MODERATE slope, NEVER make an uphill turn as this could cause a tip-over situation.

•

To avoid tip over, keep the attachment as low as possible to maintain a low center of gravity.

Tigercat M726D Mulcher

Safety

OPERATING SAFETY PRECAUTIONS continued Park machine at least 50 feet (15 meters) away from other equipment and in a cleared area. In the event of a fire, this distance will minimize the chance of the fire spreading to other equipment.

1

Before leaving operator's cab, apply the parking brake and lower the attachment onto the ground.

•

If out of the operator's cab for an extended period shut the machine off.

726DM-019

When parking the machine: •

Park on level ground.

•

Do not park on a hillside or incline.

•

Lower attachment onto level ground.

•

Engage the parking brake.

•

When transporting the machine watch that enough clearance is available on both sides and above the machine or any of its attachments to avoid contact with power or telephone lines, bridge structures, etc.

PRESSURIZED HYDRAULIC TANK. Before servicing any hydraulic components, vent hydraulic tank. Refer to SECTION 2 of this manual for VENTING THE HYDRAULIC TANK procedure.

Stop the engine and vent the hydraulic tank.

Refer to SECTION 2 of this manual for VENTING THE HYDRAULIC TANK procedure.

•

Release pilot system pressure by performing the following steps:

Turn the battery disconnect switch (1) off if the machine is to be parked for an extended period of time (Example - overnight).

When travelling on public roads, use accessory lights (when installed) and other cautionary devices to provide operators of other vehicles warning of your approach. Ensure your machine meets all regulatory requirements.

CAUTION

•

BATTERY DISCONNECT SWITCH

1. Close both doors. Turn key switch to ON position. Do not start the engine. Press pilot reset switch.

Complete either steps 2A or 2B. 2A.Fully apply brake foot pedal 50 times or more.

2B.Turn rear differential switch ON and hold front differential lock switch ON for 30 seconds. While waiting, pump brake foot pedal at least 10 times.

3. Pressure may remain in the system after completing all of the above steps.

Use caution when loosening hydraulic connections.

For additional information, refer to RELEASE PILOT SYSTEM PRESSURE in SECTION 5 of the SERVICE MANUAL.

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Tigercat M726D Mulcher

Safety SWITCH

OPERATING SAFETY PRECAUTIONS continued

•

Before moving the machine to the work site, check to ensure that all doors, panels, and access covers are installed properly and secured.

•

CAB EXITS

ACTUATOR

There are three ways to exit the cab in case of an emergency.

1. Left door, this is also the main point of entry and is the only door that should be used under normal operating conditions to enter or leave the cab. This door is also equipped with a SAFETY INTERLOCK SWITCH. See SAFETY INTERLOCK SWITCH ON DOORS in THIS SECTION.

INTERLOCK SWITCH (L.H. DOOR SHOWN)

197-5

SAFETY INTERLOCK SWITCHES ON DOORS: Both doors are equipped with safety interlock switches to prevent the machine from being operated while either of the doors are open (pilot system is shut off).

2. Right door, should be used for emergency exits only. Do not use this door to routinely enter or leave the cab. This door is also equipped with a SAFETY INTERLOCK SWITCH. ALWAYS shut OFF engine before using the right door exit.

CAUTION Safety interlock switches DO NOT lock out the steering function on machines equipped with a steering wheel.

3. Escape hatch, this is a third cab exit for use if the cab door exits become blocked.

CAUTION DO NOT use the steering joystick to assist entering or leaving the cab.

This hatch is not equipped with a safety interlock switch and therefore when left open will not deactivate the pilot controls in the cab.

ALWAYS shut OFF engine before using the escape hatch exit.

NOTE: The engine can be started but the machine functions cannot be operated with a door open.

To operate:

It is important that the operator of the machine be familiar with these emergency exits and how to use them.

Close both doors and press the PILOT RESET switch.

All three exits should be checked to make sure that they are operational and will function in an emergency. The safety interlock mechanism on the cab doors and escape hatch retaining mechanisms must not be tampered with or defeated.

CAUTION All functions on the machine can now be operated, either as intended or by accidentally touching them.

Once the safety interlock system has been activated, the safety of both the operator and all persons outside the cab becomes the responsibility of the operator.

IMPORTANT Unlock both doors before operating machine to allow opening from the outside in case of an emergency. Make sure that the doors are operational, open the doors twice, once using the exterior handle and once using the interior latch handle.

The door safety interlock switches and the pilot reset switch are a safety feature and their function must not be defeated in any way.

For additional information, refer to EMERGENCY EXITS in SECTION 2 of the OPERATOR'S MANUAL.

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Tigercat M726D Mulcher

Safety DANGER ZONES

OPERATING SAFETY PRECAUTIONS continued

Danger exists most prominently to the rear and front of the mulching head.

MULCHING OPERATION SAFETY

Operate so that the main discharge areas of the mulching head are not directed at people, livestock, buildings or other machines.

Land clearing operations generally involve other machinery and people on the site. Operators must maintain an awareness of all working traffic within 500 feet of the mulching operation.

Throw distance for metal pieces and stones can be many times the distance for wood chips.

Pieces of wood, debris from the ground and even cutting tools separating from the rotor become potentially dangerous projectiles when thrown from these machines.

Danger is greater if the site contains stones or abandoned metal.

Poor maintenance increases the danger.

Through timely inspection and replacement of worn cutter tools, fasteners and wear plates.

Always heed warning signs of missing cutter tool parts or sounds of striking rocks and adjust operation to suit the site.

Inspect cutter tools, cutter tool fasteners, rotor and mulching head assembly.

Ensure that all cutter tool retaining bolts are at correct torque value.

Do not operate in a way that throws chips in a direct line at the machine cab.

Replace all worn cutter tools.

Always replace the fastener whenever replacing a cutter tool.

REAR DANGER ZONE Chunks of wood and rock can be thrown from the rear of the mulching head. This occurs when the mulching head is raised high enough to allow debris to escape the guard chains. No one should be allowed within the HAZARD ZONE. This condition is dangerous, refer to HAZARD ZONE in THIS SECTION. The following precautions should be followed:

Inspect the rotor for weld cracks and other damage.

Check that the rotor does not wobble due to worn shaft bearings.

Never start or use a machine if the rotor has missing cutting tools, missing cutting tool fasteners or a bent rotor.

Shut down the machine immediately if you feel excessive vibration when the rotating cutter is running.

• •

Check that the cutter housing is clear and undamaged.

•

DANGER ROTATING CUTTER

FRONT DANGER ZONE To the front a lower volume of projectiles may be experienced. However, no one should be allowed within the HAZARD ZONE. Refer to HAZARD ZONE in THIS SECTION. The following precautions should be followed:

The safety of persons outside the cab is the responsibility of the machine operator.

Danger caused by flying debris. Improper operation of the attachment and failure to follow safety precautions can result in personal injury.

FRONT DANGER ZONE

• 726M-026

Never allow anyone to the rear of the machine while it is in operation.

Inspect daily for damaged or missing guard chains. Replace them before operating.

Be especially careful when the tool is lowered onto new material and when the tool is raised up and out of material it has been working.

•

REAR DANGER ZONE

•

•

•

Never allow anyone to the front of the machine while it is in operation.

Close the mulch door (if equipped) while pullworking to better contain debris. This also increases the fineness of the shredded product.

Be especially careful when the tool is lowered onto new material and when the tool is raised up and out of material it has been working.

DO NOT operate without guards.

DANGER ZONES 1.10

Tigercat M726D Mulcher OPERATING SAFETY PRECAUTIONS continued URBAN PRECAUTIONS Increased safety precautions are required when working: • • • •

Near streets Near highways In parks, on golf courses or other inhabited areas.

Near buildings

Establish Safety parameters that fit the site: • • •

String coloured warning tape to cordon off the area.

Use a traffic director when the hazard zone impinges on pedestrian or vehicular traffic.

Erect barriers.

Safety ANIMAL REMAINS Animal remains such as calf and deer carcasses will plug the machine due to their leathery skin.

Avoid the unpleasant task of removing the remains from the rotor.

AVOID FENCES Do not drive the mulcher into fences, especially chain link fences. Chain link fencing can damage the rotor. Refer to AVOID METAL AND WIRE above.

When operating mulching head properly position head for push working and pull working for safety and improved operation.

When tree toppling always know and control the direction a tree will fall to prevent injury to coworkers or damage other vehicles.

CAUTION

ASSESSING THE POTENTIAL DANGERS OF THE JOB SITE Before working in a new area a visual survey of the area to be worked is helpful in identifying undesirable materials which may be present.

Remove as much of the undesirable materials as is practical before proceeding.

AVOID METAL AND WIRE. Metal can break cutter tools and create a projectile hazard.

Wire wraps itself around the rotor shaft especially near the bearings. Near bearings this can cause wire to enter past the grease seals and cause damage to bearings if it is not removed promptly.

USE CAUTION WITH STRINGY VEGETATION Shredding materials like Palmetto, Bird of Paradise, and yard waste tied with plastic should be approached with caution. Stringy vegetation and plastic ties gravitate toward the bearings.

The operator should exercise caution while working with this type of material.

AVOID PLASTICS Hoses, bags, tarps and ropes must be removed as soon as they are seen.

Mattresses, rugs, clothes and cloth will plug the machine immediately.

To prevent component damage, always have deflector door open when preparing to fell standing trees Work within your operating skills, do not attempt to cut down a tree that is too large to handle.

When pull working (moving in reverse), watch for obstacles in your path.

Always travel with mulching head as close to the ground as possible, never elevate the mulching head unless necessary.

Never use this machine to clear an area when other equipment and operator's are also moving in. Pre-plan to work the area in advance before other equipment arrives.

Never work alone. Regularly inform other crew members of your intentions, location and length of time to perform duties.

Stop the rotating cutter before leaving the mulching area. NOTE: The cutter will continue to free wheel for several minutes after the cutter switch has been turned OFF. To stop cutter from rotating, CAREFULLY lower the rotor onto a stump. This should be done gently to prevent unnecessary loading of the rotor, housing and bearings.

Inspect the rotor for clinging strands often.

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Tigercat M726D Mulcher

SERVICING SAFETY PRECAUTIONS

Safety Prior to welding on any part of the machine, it should be cleaned and a fire extinguisher should be made available at the welding location. Care must be taken in attaching the welding machine grounding clamp so electrical current does not pass through bearings, especially the center joint bearing.

This machine is equipped with sensitive electronic control equipment, prior to welding:-

Conduct maintenance inspections at least as frequently as recommended in SECTION 3 of the OPERATOR'S MANUAL.

1

When servicing or repairing equipment, shut the engine down, and disconnect the negative (-) battery cable from both batteries.

Install a “DO NOT START ENGINE” sign on the operator’s cab door and in the engine compartment when making repairs to the machine.

•

726DM-019

BATTERY DISCONNECT SWITCH

Turn Battery Disconnect Switch (1) to the OFF position and disconnect the negative (-) battery cable (2) from both batteries.

DISCONNECT MULTI PIN CONNECTORS

•• • Before performing maintenance or repair work on any equipment, consult the manufacturer’s instruction manual and follow recommended procedures.

The radiator and the engine cooling system should be cleaned and serviced at least daily to maintain moderate engine temperatures.

726D-017

DISCONNECT PIN CONNECTORS

Disconnect the engine CPU (Central Processing Unit) and engine wiring harness by unplugging the multi-pin connectors.

WARNING This machine is equipped with a reversible cooling fan. Exercise care when working in this area with the engine running.

This machine is equipped with a reversible cooling fan to facilitate cleaning of the charge air cooler, radiator and oil cooler assembly. Exercise care when working in this area with the engine running.

If the fan switch in the cab is in the AUTO position, the fan could turn ON and/or go into REVERSE mode without warning.

•• DISCONNECT MULTI PIN CONNECTORS

•• 726M-028

DISCONNECT PLUS 1 CONNECTORS

Disconnect the Plus 1 Controller by unplugging the 2 multi-pin connectors.

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Tigercat M726D Mulcher

Safety pressure from pilot system and brake accumulators before performing work on components, or disconnecting any hoses. For the procedure on how to RELIEVE PRESSURE, refer to PARKING THE MACHINE in THIS SECTION.

SERVICING SAFETY PRECAUTIONS continued WARNING Beware of the pneumatic and hydraulic stored energy sources (pressurized systems) on this machine. Vent and relieve trapped pressure as outlined in this section before performing work on components, or disconnecting any hoses.

Understand maximum pressures permitted in each pressurized system and DO NOT EXCEED MAXIMUM PRESSURE! A

& PILOT SYSTEM D BRAKE ACCUMULATORS

The hydraulic tank on this machine is pressurized by the air compressor air supply system. Lower the attachment to the ground, stop engine, vent hydraulic tank, and relieve trapped pressure from pilot system and brake accumulators before performing work on components, or disconnecting any hoses. For the procedure on how to RELIEVE PRESSURE, refer to SECTION 2 of this manual for VENTING THE HYDRAULIC RESERVOIR procedure.

PRESSURIZED HYDRAULIC OIL TANK

PRESSURIZED AIR SUPPLY TANK

•• •

PRESSURIZED HYDRAULIC TANK. Before servicing any hydraulic components, vent hydraulic tank. Refer to SECTION 2 of this manual for VENTING THE HYDRAULIC TANK procedure.

C

B

PRESSURIZED WATER SYSTEM IN CAB

CAUTION

•• • • E PRESSURIZED WATER TANK

WARNING Diesel fuel or hydraulic fluid under pressure can penetrate the skin and cause serious personal injury, blindness, or death. If any fluid is injected into the skin, it must be surgically removed within a few hours by a doctor familiar with treating this type of injury.

Explosive release of fluids from pressurized cooling system can cause serious burns.

Shut off engine. Only remove filler cap when cool enough to touch with bare hands. Slowly loosen cap to first stop to relieve pressure before removing completely.

Never use bare hand to check for fluid leaks.

Fluid leaks under pressure may not be visible.

When searching for leaks, wear work gloves and use a wrench or piece of wood to move hydraulic hoses. Do not grab hold of hydraulic hoses. Wear safety goggles for eye protection.

Do not change any pressure or relief setting unless authorized instruction has been obtained.

Use the proper tool for the job. Repair or replace worn or damaged tools including lifting equipment immediately.

Pressure can be maintained in a hydraulic system long after the power source and pump have been shut down. Lower the attachment to the ground, stop engine, vent hydraulic tank, and relieve trapped 1.13

Tigercat M726D Mulcher

Safety

SERVICING SAFETY PRECAUTIONS continued

WARNING

Keep your hands, feet, head, and loose clothing away from power driven parts. Tie long hair behind your head. Remove rings and other jewelry to prevent electrical shorts and entanglement in moving parts.

Always install boom lift lock before working on or around machine with boom raised.

• Always install 'T' handle retainer bolt • Use only to support boom and cutting head • Do not use to set hydraulics pressures

CAUTION

Always be aware of machine pinch points that could cause injury. Never place body parts within the range of motion of the working parts of the machine.

Do not open cab doors or window screens when machine is on a slope. The doors and screens are heavy and could swing out with considerable force.

WARNING Failure to follow all of the above instructions could result in serious injury or death from crushing.

REAR CHASSIS FRONT CHASSIS

•

•

RETAINING PIN

• • LYNCH PIN

LOCK BAR

• 726D-039

LOCK BAR IN LOCKED POSITION

To prevent accidental articulation of the machine and injury when working in the center joint area, install the frame articulation lock bar between the frames and hold in place with the lynch pins provided.

Never stand under an object supported with hydraulics. Always use safety stands or a locking device.

WARNING DO NOT work below or behind a machine that is parked on a grade.

WARNING Always allow the cutter to come to a COMPLETE STOP before approaching attachment to make adjustments.

1.14

Tigercat M726D Mulcher

Safety

SERVICING SAFETY PRECAUTIONS continued

20231A R1

Compartment door and panel handles should be hand tight only at all times for easy access to the engine compartment and the pressurized water system in the event of a fire or other emergency. Refer also to FIRE PREVENTION in THIS SECTION. HAND KNOB

L.H. SIDE ACCESS PANELS

If the engine is running inside a building, ensure that sufficient ventilation is available to prevent a buildup of toxic exhaust fumes. Run the engine only when it is necessary for testing or adjustments.

Work in a ventilated area. If it is necessary to run an engine in an enclosed area, use an exhaust pipe extension to remove toxic exhaust fumes.

If you don't have an exhaust pipe extension, either work outside, or open the shop doors.

•

•

• •

726-001

L.H. ENGINE ACCESS PANELS

R.H. SIDE ACCESS PANELS

••

HAND KNOB

Dispose of fluids properly.

Do not pour fluids into the ground, stream, pond or lake.

Before draining any fluids, know the proper way to dispose of them.

• •

•

726-002

R.H. ENGINE ACCESS PANELS

1.15

Tigercat M726D Mulcher

FIRE PREVENTION

When working in a forest environment, it is impossible to prevent combustible debris from collecting in tight corners of the machine. This debris, in itself, may cause a fire; however, when mixed with fuel, oil or grease in a hot or confined place, the danger of fire is greatly increased.

The following fire prevention guidelines should be used to supplement the operator’s fire prevention efforts. In no case should the guidelines be used, or assumed, as replacements for diligent operator efforts at preventing fires.

The following guidelines will help to keep your equipment up and running efficiently and keep the risk of fire damage to a minimum.

1. Maintain a CHARGED fire extinguisher on the machine at all times and KNOW HOW TO USE IT. 2. Inspect the machine for any signs of fuel or hydraulic system leakage and check for worn or eroded fuel or hydraulic lines before starting up any equipment.

3. Inspect the EXHAUST SYSTEM DAILY for any signs of LEAKAGE. Check for worn, cracked, broken, or damaged pipes or muffler. Also check for missing or damaged bolts or clamps. Should any exhaust leaks or defective parts be found, repairs must be made immediately. Engine exhaust leaks can cause fires, DO NOT OPERATE the machine until the exhaust leak is repaired.

4. During daily operation of the machine, the occurrence of exhaust leaks are usually accompanied by a change or increase in engine exhaust noise levels. These audible warnings cannot be ignored. Should any exhaust leaks occur during operation, the machine must be shut down immediately and not put back to work until the necessary repairs have been completed.

Safety 5. Remove debris and blow out dust regularly from the air intake doors, engine radiator, hydraulic oil cooler and A/C condenser core to prevent overheating of the engine and hydraulics. Refer to CLEANING A/C CONDENSER, OIL COOLER AND RADIATOR in SECTION 2 of the OPERATOR’S MANUAL. 6. Blow off all debris and dust accumulated near hot engine exhaust components (turbocharger and exhaust manifold as well as exhaust pipes and muffler) at the completion of each work shift or more frequently depending on logging conditions. Visual inspection after blow off to ensure thorough cleanliness is vital. Engine exhaust systems provide numerous small pockets where saw dust, small wood chips and other flammable forest debris can gather. Even small accumulations close to hot exhaust components can ignite and smolder. If dislodged by vibration this smoldering debris can fall into other areas of the machine and thereby spread a fire.

7. Clean out all accumulated forest debris (twigs, pine needles, branches, bark, leaves, saw dust, small wood chips) and any other combustible materials from inside the machine belly pans or lower machine structures as well as from areas in proximity to the engine, fuel and hydraulic oil systems no less frequently than at the completion of each work shift.

8. AFTER transporting (trucking) a machine from one job sight to the next, open all doors and access panels and blow off any debris that may have repositioned itself onto the engine and exhaust parts due to wind turbulence caused by the journey.

9. Clean up any grease, diesel fuel, hydraulic and lubricating oil accumulation and spillage immediately.

10. Steam clean the engine, transmission, brake, fuel and hydraulic tank compartments of all equipment at least once a month or more frequently depending on logging conditions.

11. Be cautious when smoking. An open flame, a lighted cigarette, etc., should not be permitted around any vehicle, especially during fuelling operations and/or when the fuel system is open to the atmosphere, and/or when servicing batteries.

1.16

Tigercat M726D Mulcher FIRE PREVENTION continued 12. Shut down equipment immediately when a problem is suspected or smoke is detected.

Safety •

Ensure that the nozzle of any hand held extinguishers available at the work site fits within the access holes in the doors of the machine.

•

Ensure that you have the proper fire extinguishers on site. Most fires involving mobile equipment will be of the A or B type.

You should have a dry chemical extinguisher rated ABC and a pressurized water extinguisher rated A.

•

Prevent the fire from happening by ensuring that the machine is cleaned regularly and all systems are well maintained.

13. Park the machine at least 50 feet away from other equipment at the end of each shift.

14. Turn the battery disconnect switch to OFF at shut down to avoid loss by electrical short.

15. Remain with the machine for at least 45 minutes at the end of operations while the machine cools.

16. Once a fire has started on a machine hoses will quickly burn through causing pressurized fluids (diesel fuel, hydraulic oil, etc.) to fuel the fire. NEVER leave the machine parked with booms or arches suspended off the ground, as they will inject hydraulic oil into the fire if a supporting hose burns through.

17. Remove all keys, lock equipment and fuel cap at the end of operations to reduce the risk of vandalism.

18. Before starting repair work, such as welding, the surrounding area should be cleaned and a fire extinguisher should be close by.

19. Use only nonflammable solutions for cleaning the machine or components.

20. Store rags and other combustible materials in a safe, fireproof location.

21. Do not use the machine on top of or to push piles of burning timber. A machine fire will result.

EQUIPMENT FIRES ADVERSELY EFFECT YOUR ABILITY TO LOG, MAY INCREASE YOUR INSURANCE PREMIUMS DRAMATICALLY OR PREVENT YOU FROM OBTAINING INSURANCE COVERAGE AT ALL.

*NOTE: Dry chemical fire suppression systems are offered by Tigercat as an optional installation on some of the Tigercat product lines. Please disregard any references made to fire suppression systems if not installed on your machine.

WHAT TO DO IN CASE OF A MACHINE FIRE •

At all times ensure your own personal safety and the safety of anyone that may be in the area. Approach any fire with extreme caution.

•

If the machine is in a dangerous position, attempt to move to a safe position. Lower working attachment to the ground.

•

Shut the engine off.

•

Activate the fire suppression system*

•

Radio or call for help (as appropriate).

•

Exit the machine taking fire extinguisher or water hose (if applicable) with you.

•

If you can safely do so, turn OFF battery disconnect switch.

•

If you can safely open the access panels to the machine, in the area of the fire, do so.

•

If you can safely do so, attempt to extinguish the fire.

•

A dry chemical fire extinguisher should be used first, if available.

WHAT ELSE TO DO BEFORE YOU EXPERIENCE A FIRE •

Ensure that you are familiar with emergency procedure in the event of a fire.

•

Ensure that your fire suppression system* is charged and functional.

•

Ensure that any hand held fire extinguishers are charged and functional.

•

Ensure that any stored water systems on the machine are charged and functional.

Continued on page 16

1.17

Tigercat M726D Mulcher

Safety •

Use the pressurized water hose supplied with the machine (if applicable) or a pressurized water extinguisher (if available) after the discharge of a dry chemical extinguisher or suppression system* to remove heat build up from the area. A fire suppressed by a dry chemical powder may re-ignite with the latent heat of any debris in the area.

•

Remain with the machine until help arrives to ensure that the fire does not re-ignite.

•

Ensure that the machine and all components have cooled down sufficiently after a fire has occurred. Beware of the possibility of coolant or hydraulic hoses rupturing after a fire spraying hot oil or coolant which may result in severe burns.

FIRE PREVENTION continued Continued from page 15

•

Use the PASS method with most extinguishers.

•

Pull the pin. This will allow you to discharge the extinguisher.

•

Aim at the base of the fire. If you aim at the flames (which is frequently the temptation), the extinguishing agent will fly right through and do no good. You want to hit the fuel.

•

Squeeze the top handle or lever. This depresses a button that releases the pressurized extinguishing agent in the extinguisher.

•

Sweep from side to side until the fire is completely out. Once the fire is out, keep an eye on the area in case it re-ignites.

WHAT TO DO AFTER A FIRE •

Notify your equipment dealer and or Tigercat Industries Inc. by completing an incident report, Tigercat form number 5101.

•

Ensure that the cause of the fire is determined and all appropriate repairs are completed before returning the machine to work.

•

Ensure that the fire suppression system* is properly serviced and returned to a functional state (if applicable).

•

Ensure that all extinguishers used in fighting the fire are replaced or recharged as appropriate.

*NOTE: Dry chemical fire suppression

20229A

systems are offered by Tigercat as an optional installation on some of the Tigercat product lines. Please disregard any references made to fire suppression systems if not installed on your machine.

TYPICAL FIRE EXTINGUISHER ACCESS HOLE

•

Place the nozzle of the fire extinguisher into the appropriate fire extinguisher access hole and discharge the extinguisher.

•

Failing all attempts to access the machine compartment, attempt to discharge the extinguisher through the mesh or any available openings on the machine.

1.18

DANGER USING HIGH SPEED DISC SAWS SAFELY This information is intended to encourage logging organizations and operators to develop and practice additional rules that suit particular terrain conditions and job requirements. It is also intended to assist towards a quicker understanding of how and why things can happen when a high speed disc saw is in use; and hence to assist in development of safe operating practices.

The following information is in addition to any safety instructions or recommended safe operating practices that may already be in circulation.

CONTENTS COMMENTS AND INSTRUCTIONS DIRECTION OF THROW ........................................................ 7 HIGH ANGLE WRIST ROTATION ABILITY ............................ 8 RECOGNIZING THE DANGERS ............................................ 7 THROWING LONG WOOD PIECES .................................... 10 DANGERS ................................................................................. 3 FORWARD ................................................................................. 2 BE AWARE OF THE HAZARDS ............................................. 2 OTHER INSTRUCTIONS ....................................................... 3 SAFE PRACTICES ................................................................. 3 SEVERAL TYPES OF HEADS INVOLVED ............................. 2 STORED ENERGY ................................................................. 2 HIGH ANGLE WRIST ROTATION CAPABILITY ......................... 9 SAW HEAD DON’TS ................................................................ 15 TYPE OF HOUSING MAKES A DIFFERENCE ......................... 4

Tigercat

5211A • R2-1101

PAGE 1 OF 16

®

using high speed disc saws safely FORWARD:

Tigercat

®

Several types of heads involved Tigercat wheel type feller-bunchers and crawler feller-bunchers can be supplied with several optional makes and models of high speed disc saw tree felling heads. Because each has certain advantages and disadvantages they are chosen where they best do specific types of work.

Stored energy The saw blade stores energy from the hydraulic motor during the times between tree cuts so that it can supply up to 1000 hp during a 1 sec tree cut. However this rotational energy, if misapplied can result in wood materials or other objects being thrown strongly enough to cause damage and to hurt people.

Be aware of the hazards It is important that users of machines with disc saw felling heads are aware of certain safety precautions that need to be taken. In this section some previously unknown, unexpected safety hazards are illustrated and explained . These should be studied before use of the machinery and then reviewed again after use has begun.

FIGURE 1: BROADSIDE SAW CONTACT WITH A LOG COULD PRODUCE A THROW

FIGURE 2: A SUDDEN MACHINE MOVEMENT MAY CAUSE AN UNEXPECTED THROW AT THE CAB

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using high speed disc saws safely

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Safe practices It is understood and expected that logging organizations and operators will develop and practice additional rules that suit (for example) particular conditions of terrain, trees, soil and job requirements. The information given here is intended to assist towards a quicker understanding of how and why things can happen when a high speed disc saw is in use; and hence to assist in development of safe operating practices.

It should not be assumed that all possible dangers have been discovered and described here.

Other instructions It is also understood and expected that all instructions contained in service and operator's manuals for use and maintenance of Tigercat disc saw heads and other disc saw heads installed on Tigercat machines will be followed.

THE DANGERS

There are at least these means by which a rotating disc saw can cause harm by throwing: • The normal throwing of chips from the cut.

• Soil particles are thrown from the ground.

• Loose chunks of wood encountered or produced are tossed by the exposed blade.

• Sticks and debris falling onto the blade or sliding across the blade are struck by the teeth and thrown.

• Metal pieces from the blade or from objects encountered are thrown.

• Wood pieces enter the saw housing and are expelled by the blade.

• In very peculiar cases the saw can throw long lengths of wood as spears.

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using high speed disc saws safely

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TYPE OF HOUSING MAKES A DIFFERENCE Since the configuration of the saw housing can affect the safety of its use we need to identify some particular types of housing shapes and guarding being used.

Figure 3 shows a typical commonly used saw housing plan where there is a continuous skirt around the saw except at a mouth opening where the trees are cut and taken. The skirt extends below the saw enough to intercept tangential throw. There are snouts on both sides of the mouth so that if pushed against the side of a felled tree or log the saw teeth will not contact the wood.

THROW ANGLE

IF A SAW HEAD IS PUSHED AGAINST THE SIDE OF A FELLED TREE, SNOUTS PREVENT SAW TEETH FROM CONTACTING WOOD.

•

•

FIGURE 3: TYPICAL COMMONLY USED SAW HOUSING, CONTINUOUS SKIRT WITH OPENING WHERE TREES ARE CUT. SNOUTS ON BOTH SIDES OF THE MOUTH.

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using high speed disc saws safely

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Figure 4 shows another commonly used plan. It has no blade guarding snouts so that the saw blade teeth do protrude ahead of the housing. This may be preferred over figures 3 and 5 for dexterity in tree getting.

THROW ANGLE

IF A SAW HEAD WITHOUT SNOUTS IS PUSHED AGAINST THE SIDE OF A FELLED TREE, SAW TEETH WILL CONTACT WOOD.

FIGURE 4: ANOTHER COMMONLY USED HOUSING PLAN WITH NO SNOUTS, BLADE TEETH PROTRUDE AHEAD OF THE HOUSING.

In figure 5 there is a much longer snout on the ingoing side of the mouth, i.e., where the teeth of the rotating blade are entering the housing. The broad side of a log, if nudged, will not contact the saw teeth and more thrown material will be intercepted by the extra length of snout.

THROW ANGLE

NUDGED LOG WILL NOT CONTACT SAW TEETH.

• EXTRA LENGTH OF SNOUT WILL INTERCEPT PORTION OF THROWN MATERIAL.

FIGURE 5: HOUSING USES LONGER SNOUT ON IN-GOING SIDE OF MOUTH WHERE ROTATING BLADE ENTERS HOUSING.

5

using high speed disc saws safely Housing types cont.

Tigercat

®

In figure 6a and 6b there is an additional opening in the housing skirt. Openings in this location are sometimes provided for escape of wood chips produced by the saw teeth in the cut and being taken into the housing.

A CHIP ESCAPE PORT CAN ALLOW THROW BEHIND THE MACHINE

REAR

FRONT

FIGURE 6a

FIGURE 6b

FIGURE 6c

FIGURE 6: ADDITIONAL OPENING IN THE HOUSING SKIRT.

In figure 6c a guard has been added to the chip escape port so that tangential travel of chips and other material is intercepted as soon as it leaves the housing.

Each figure shows a shaded area where normally tangentially thrown material can escape from the saw housing. Deflected and dropped chips escaping below the bottom edge of the housing skirt are not included. The areas and angles are not exact but do show that one head can be different from another.

It is important that the operator familiarize himself with the blade rotation direction, the effectiveness of any snout on the in-going side and which direction any chip escape ports allow material to fly.

6

using high speed disc saws safely COMMENTS AND INSTRUCTIONS

Tigercat

®

Recognizing the Dangers While it may appear that these illustrated danger areas can be visually recognized on the job by observing how far chips fly during a cut, that is only true for chips and other light weight materials.

Metal parts and wooden spears can be thrown to surprisingly greater distances. Even distant personnel on the ground, in other vehicles, or in buildings are at risk if the throw is in their direction.

Direction of throw The direction of possible tangential throw for metal parts and stones is dependent on the housing configuration and might be expected to be the same as observed for the chips. However, these throws can occur at any time the saw is running, in whichever direction the angle of throw is pointed by boom geometry, not just when a cut is being made.

Throw distance The throw distance for metal pieces and stones, can be many times the distance shown by the pattern for chips. More testing and data collection is needed to pin down a “safe distance” but if someone or something is in a place that can be seen by the operator and in the throw direction of a high speed disc saw, then the operation is not safe regardless of the distance.

Safe operating areas These saw heads must not be used in areas where the logging operation does not have control over the presence and movement of people. In particular, clearing of vegetation in urban and populated areas should not be done with a Tigercat manufactured or supplied high speed disc saw. High speed disc saw heads are intended for high productivity wood harvesting in areas remote from normal habitation. The possible presence of people and property within throw range and the likelihood of encountering scrap metal, wire fencing, steel posts and concrete must be respected.

Assessing the potential dangers on the job site The extent of danger from high speed disc saws on the logging operation has to be assessed on the job site, depending on how much other work activity is in the area and whether the operator can do his job of cutting and bunching with good control of throw patterns. Danger is greater if the saw is equipped with detachable, or fragile, or brittle teeth, or if the site contains stones or abandoned metal.

7

using high speed disc saws safely Comments and Instructions cont.

Tigercat

®

Regular maintenance Poor saw maintenance increases these dangers. Some designs that might allow fasteners to wear thin or fatigue and suddenly break, need thorough timely replacement procedures. It is important that the warning signs of missing saw tooth parts or the sounds of striking rocks be heeded and the operation adjusted to avoid danger.

High angle wrist rotation ability When a felling machine is equipped with a high speed disc saw head with a high angle wrist rotation ability it should be determined that the limits of the boom, stick, tilt, wrist, upper leveling and any other freedoms, do not permit a direct throw at the operators cab during normal operation, see figure 7a. It is probably essential that the housing have a long snout on the throw side and that if a chip escape port is used it should be guarded.

With these high mechanical freedom arrangements there is a chance that an unforeseeable operator misadventure or equipment failure could result in an accidental direct or deflected throw at the operators cab, refer to figure 2 and 7b. The cab should be capable of resisting such accidental and ricochet throws. The velocity energy of metal or rock pieces leaving the blade is extremely high. The operators cab cannot be considered safe to routinely operate in the chip throw area, even if it has been especially constructed to prevent penetration by accidentally thrown objects.

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using high speed disc saws safely

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FELLING HEAD • WITH A CHIP ESCAPE PORT AND SHORT SNOUT. • SHOWN IN A HIGH ANGLE WRIST ROTATION POSITION, PLACING OPERATOR'S CAB IN DIRECT LINE WITH UNGUARDED CHIP ESCAPE PORT

FIGURE 7a

PLAN VIEW OF MACHINE SHOWING CLOCKWISE AND COUNTERCLOCKWISE BLADE ROTATION

FIGURE 7b FELLING HEAD • WITH LONGER SNOUT ON THROW SIDE OF OPENING AND WITH A GUARDED CHIP ESCAPE PORT.

FIGURE 7: DISC SAW FELLING HEAD WITH HIGH ANGLE WRIST ROTATION CAPABILITY

9

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using high speed disc saws safely Comments and Instructions cont.

Tigercat

Throwing long wood pieces Dangers from throws of long wood pieces are illustrated in figures 8 to 11. Tests and experience have shown that when a high speed rotating saw is applied to a loose piece of wood, the wood is either blown or pushed away, without a throw. If the wood is held firmly in all directions and the saw advanced into it at any feed speed, cutting will take place. If the wood is only held against escape from the saw radially, but not held tangentially, then the wood will be both partly cut and partly moved tangentially. In this last case tests have shown that if the piece of wood is backed-up by a solid slippery surface; and if the feed in is very fast; and if the piece of wood is long enough; then the tangential movement is a dangerous spear-like throw.

A SLAB, WHICH COULD LATER BE THROWN, MIGHT HAPPEN WHEN NOT ENOUGH ROOM IN HEAD TO COMPLETELY CUT THE LAST TREE

SLAB

•

SLAB

• FE

ED

IN

FIGURE 8a: HOW A SLAB CAN BE THROWN FROM THE SIDE OF A LOG

TH DIR ROW EC TIO N

SAW HOUSING HAS SKIS, BUT WITHOUT SNOUTS AND BLADE TEETH PROTRUDE AHEAD OF THE HOUSING.

FIGURE 8

THROW ENGAGEMENT DISTANCE FELLING HEAD MOVING INTO SLAB/LOG

®

SLAB

LOG A LONG THROW ENGAGEMENT DISTANCE CAN CAUSE A DANGEROUS SPEAR THROW

• •

FIGURE 8b SIDE VIEW

FEED IN

IF THE SIDE OF A LOG CAN CONTACT THE SAW, THE THROW ENGAGEMENT DISTANCE CAN BE LONG

10

FIGURE 8c TOP VIEW

using high speed disc saws safely Comments and Instructions cont.

Tigercat

®

Figures 8 and 9 show two ways that this might happen in the woods if using the saw head of figure 4 (where the throw contact can be long). A slab, still partly attached to a well backed-up tree bole and wet with sap, makes an ideally bad throw situation which could unintentionally occur in woods work. A small log in a pile of other logs might also be propelled out with enough length of continued contact to reach near saw tip speed.

A SMALL LOG IN A PILE OF OTHER LOGS MIGHT ALSO BE PROPELLED OUT WITH ENOUGH LENGTH OF CONTINUED CONTACT WITH THE BLADE TO REACH NEAR SAW TIP SPEED.

• FE

ED

IN

FELLING HEAD MOVING INTO LOG PILE

FIGURE 9a: HOW A LOG CAN BE THROWN LIKE A SPEAR SAW HOUSING WITHOUT SNOUTS AND BLADE TEETH PROTRUDE AHEAD OF THE HOUSING.

SMALL LOG

THROW ENGAGEMENT DISTANCE LOG PILE

FEED IN

•

•

A SAW HOUSING WITHOUT SNOUTS ALLOWS A LONG THROW ENGAGEMENT DISTANCE

FIGURE 9b SIDE VIEW

FIGURE 9c TOP VIEW

IF THE SIDE OF A LOG CAN CONTACT THE SAW, THE THROW ENGAGEMENT DISTANCE CAN BE LONG

FEED IN

11

using high speed disc saws safely Comments and Instructions cont.

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®

Figure 10 shows how a head with snouts does not allow a long throw contact. Although tests show that a short contact length on a long log or tree butt does not result in a spear like throw, this action should nevertheless be avoided because abnormally large chips are sometimes produced and thrown.

UNCUT TREE OR STUMP BACKUP THROW ENGAGEMENT DISTANCE

• WHEN ONLY THE END OF A LOG CAN MAKE CONTACT WITH THE SAW, THERE IS NOT MUCH THROW ENGAGEMENT DISTANCE

FIGURE 10: FELLING HEAD HOUSING WITH SNOUTS DOES NOT ALLOW A LONG THROW CONTACT

FELLING HEAD MOVING INTO LOG

Figure 11 warns that blocks of wood can be tossed in any direction when improvising with a disc saw to trim over-size stumps. A long snout and a slow feed speed lessen danger during stump trimming.

A similar danger of throw may exist when clearing small brush with multiple pass cuts.

FELLING HEAD MOVING INTO STUMP (FEED SPEED)

FIGURE 11: A BLOCK OF WOOD CAN BE TOSSED WHEN TRIMMING STUMPS

12

using high speed disc saws safely Comments and Instructions cont.

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®

Saw blade throw gap Saw blades have gaps between adjacent teeth and holders to permit installation and removal of the teeth and to provide spaces to accumulate chips in the cut, see figure 12. Fallen sticks and debris or sticks and debris sliding across the the saw blade can enter these gaps when the blade is rotating and be struck by the teeth and be tossed or thrown. Larger gaps and lower rotation speeds increase these dangers.

THROW GAP

FIGURE 12: SAW BLADE THROW GAP

13

using high speed disc saws safely Comments and Instructions cont.

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Saw housing entrance and exit space To avoid the ingestion of materials into the housing space above the disc (and later ejection) the ingoing entrance for the saw rim of teeth is kept as small as practical. It is important that this high wear area be maintained at its original size and shape. The outgoing opening is large enough to allow the housing to clean itself and will allow most things inside to be thrown out, see figure 13. Its throw direction and angle must be respected. A long snout on the other side reduces this danger.

THE INGOING ENTRANCE OF THE HOUSING FOR THE SAW RIM OF TEETH SHOULD BE SMALL

THE OUTGOING OPENING IS LARGER TO ALLOW THE HOUSING TO CLEAN ITSELF AND WILL ALLOW MOST THINGS INSIDE TO BE THROWN OUT

FIGURE 13: SAW BLADE ENTRANCE AND EXIT SPACE

14

using high speed disc saws safely Comments and Instructions cont.

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®

This information is offered by Tigercat as part of interim action to make saw heads safer. It is based on what has recently been reported from the field and on tests conducted on proving grounds.

Tigercat is continuing to do design and testing of tree felling machinery towards achieving greater safety in the woods. Tigercat would be thankful for written reports describing any unsafe happenings, including near misses, in the use of felling heads and their carriers.

The following are some “SAW HEAD DON’TS” that apply particularly to throw prevention.

Do not point the throw of a disc saw head in a direction towards people, vehicles or buildings at any visible distance.

Do not operate in a way that throws chips in a direct-line at the machine cab.

Do not push hard with the saw against anything except a standing tree to be cut.

Do not mix new sharp teeth with old dull teeth on the same saw.

Do not change the blade rotation from its designed direction in the head.

Do not over speed the blade rpm.

Do not remove or shorten snouts provided by the head manufacturer or installer.

Do not neglect tooth fastening inspection, maintenance and replacement.

Do not neglect to repair worn or damaged saw housings.

Do not neglect to replace any covers removed for service or clean out.

Do not count on skis to give the throw protection that snouts do.

Do not nudge loose short pieces with the front of any type of head.

Do not nudge anything, even long logs, with the front of a head which has no snouts.

Do not cut short small stalks when blade speed is low.

Do not operate a high speed disc saw in a populated area.

Do not assume that visitors and other workers are aware of disc saw dangers.

Do not assume that the operator will spare you, a visitor, from danger.

Do not select and operate heads that throw rearward.

Do not select and operate heads with unnecessarily wide throw angles.

Do not neglect to read and follow all instructions provided by the saw and head manufacturers.

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using high speed disc saws safely

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16

®

Tigercat M726D Mulcher SECTION 3 - LUBRICATION & MAINTENANCE CONTENTS - SECTION 3 AIR CLEANER MAINTENANCE .................................................................... 3.14 AIR CONDITIONING SYSTEM, CHECKING .................................................. 3.18 BELT, ENGINE SERPENTINE, REPLACING ................................................ 3.23 CENTER JOINT LUBRICATION ........................................................................................... 3.19 MAINTENANCE ......................................................................................... 3.19 DRIVE SHAFT SPLINE LUBRICATION, MIDDLE AND REAR ....................... 3.24 ELECTRICAL SCHEMATIC SHEET 1 OF 3 ................................................................................ 3.30, 3.33 SHEET 2 OF 3 ................................................................................ 3.31, 3.34 SHEET 3 OF 3 ................................................................................ 3.32, 3.35 EMERGENCY EXITS, CHECK MONTHLY ...................................................... 3.3 ENGINE SERPENTINE BELT, REPLACING ................................................. 3.23 FILTERS ENGINE AIR CLEANER ............................................................................ 3.14 FUEL FILTER/WATER SEPARATOR ........................................................ 3.10 FUEL TANK STRAINER ............................................................................ 3.11 HYDRAULIC OIL RETURN FILTERS .......................................................... 3.12 HYDROSTATIC CHARGE PUMP PRESSURE FILTERS .......................... 3.13 SERVICING GUIDELINES FOR OIL FILTERS ........................................... 3.13 FIRE PREVENTION ........................................................................................ 3.3 HYDRAULIC OILS .......................................................................................... 3.7 NEW MACHINE MAINTENANCE FIRST 50-100 HOUR INSPECTION AND SERVICE REPORT ...................... 3.2 INITIAL PRE-DELIVERY INSPECTION ........................................................ 3.2 TIGHTENING POINTS .................................................................................. 3.2 OIL LOST FROM LEAKAGE ........................................................................... 3.2 PRESSURE SETTINGS ................................................................................ 3.29 PRESSURIZED WATER SYSTEM MAINTENANCE ..................................... 3.16 REPLACING THE ENGINE SERPENTINE BELT .......................................... 3.23 SCHEDULED MAINTENANCE GENERAL ................................................................................................... 3.3 8 HOURS .................................................................................................... 3.4 125 HOURS ................................................................................................. 3.5 250 HOURS ................................................................................................. 3.5 500 HOURS ................................................................................................. 3.6 1000 HOURS ............................................................................................... 3.6 2000 HOURS ............................................................................................... 3.6 SEASONAL ................................................................................................. 3.7 SERVICE AND LUBRICATION POINTS CHART ............................................. 3.9 SPEED CONTROL LEVER ADJUSTMENT ................................................... 3.26 STARTUP PROCEDURE AFTER MAINTENANCE ....................................... 3.20 TORQUE CHART .......................................................................................... 3.27 TORQUE SPECIFICATIONS - GENERAL ..................................................... 3.28 TRANSMISSION ........................................................................................... 3.19 CHECK OIL LEVEL ................................................................................... 3.19 WHEELS, INSTALLING .................................................................................. 3.2

MARCH, 2006

Tigercat M726D Mulcher

Lubrication and Maintenance

PREVENTIVE MAINTENANCE SCHEDULE FOR M726D MULCHER NEW MACHINE MAINTENANCE *INITIAL PRE-DELIVERY INSPECTION:PERFORM THE INITIAL PRE-DELIVERY INSPECTION USING Tigercat FORM NUMBERS 5281 AND 5283; "PDI AND 50-100 HOUR INSPECTION REPORT"

*FIRST 50-100 HOUR INSPECTION AND SERVICE REPORT:WITH THE OWNER'S MECHANIC PRESENT, PERFORM AN INSPECTION AND SERVICE ACCORDING TO THE Tigercat FORM NUMBERS 5281 AND 5283; "PDI AND 50-100 HOUR INSPECTION REPORT" THIS MUST BE COMPLETED WITHIN THE FIRST 50-100 HOUR TIME FRAME. *IMPORTANT: TO QUALIFY FOR CONTINUED WARRANTY, THIS REPORT MUST BE COMPLETED AND RETURNED TO Tigercat Industries Inc. WARRANTY DEPARTMENT.

Tightening points for First 50-100 hour inspection report:~

IMPORTANT!

All hydraulic connections

Wheels:

Hose clamps

When installing wheels, ensure that all paint has been removed from the mating surfaces of both the wheel disc and the flange of the axle to ensure metal to metal contact.

Center joint pin securing bolts Transmission securing bolts Engine mounting bolts

For additional instructions also refer to section 8 of the service manual.

Pump drive gearbox securing bolts Axle mounting bolts

Hour meter ~ maintenance:

Wheel retaining bolts

Check the machine hour meter on a regular basis to determine your scheduled maintenance times.

Cab securing bolts Pin retainers

The intervals and times on the scheduled maintenance chart in this manual are for normal operating conditions.

Any other loose nut, bolt or fitting

If your machine is being operated in difficult or severe conditions, you should service your machine at shorter intervals.

NOTE: Use of filters other than genuine Tigercat replacement filters is not recommended.

Refer to diesel engine service manual and attachment manual for additional required maintenance at this scheduled time period.

*OIL LOST FROM LEAKAGE LEAKAGE RATE ONE DROP IN 10 SECONDS ONE DROP IN 5 SECONDS ONE DROP PER SECOND THREE DROP PER SECOND DROPS BREAK INTO STREAM

3.2

LOST 0IL (GALLONS) PER PER PER DAY MONTH YEAR 0.112 3.36 40.0 0.225 6.75 81.0 1.125 33.75 405.0 3.75 112.5 1,350.0 24.00 720.0 8,640.0

Tigercat M726D Mulcher

Lubrication and Maintenance

GENERAL CAUTION All handles, steps and platforms must be kept free of grease, oil, fuel mud, snow ice and forest debris to prevent risk of personal injury.

Clean around filler caps before checking or adding fluids.

Release hydraulic pressures and clean around hydraulic fittings before breaking connection.

Plug or cap immediately.

Clean up spills as soon as possible.

Always use clean hydraulic oil and filters.

Drain dirty oil while still warm.

Do not exceed recommended fluid levels.

Service all hydraulic filters after the failure of a pump, motor, cylinder or valve. Failures of this nature could contaminate the entire hydraulic system.

Top up diesel fuel at end of each shift to reduce contamination by condensation.

Clean up oil spills on walking surfaces and top of engine enclosure immediately.

Inspect the EXHAUST SYSTEM DAILY for any signs of LEAKAGE. Check for worn, cracked, broken, or damaged pipes or muffler.

Also check for missing or damaged bolts or clamps. Should any exhaust leaks or defective parts be found, repairs must be made immediately. Engine exhaust leaks can cause fires, DO NOT OPERATE the machine until the exhaust leak is repaired.

During daily operation of the machine, the occurrence of exhaust leaks are usually accompanied by a change or increase in engine exhaust noise levels. These audible warnings cannot be ignored. Should any exhaust leaks occur during operation, the machine must be shut down immediately and not put back to work until the necessary repairs have been completed.

Before welding on machine be sure master switch is disconnected and disconnect multi pin connectors on engine CPU and engine wiring harness.

When welding secure ground connection as close to working position as possible to prevent arcing across machined surfaces or through bearings.

Clean away all branches, bark and chips.

Clean up all traces of oil to avoid fires.

Always have a fire extinguisher at hand.

For safety, always lower boom assembly to the ground when leaving cab, leaving machine unattended or during service.

For safety, when working under boom, always lower to ground, support properly or install lift boom cylinder locking device . (Refer to section 2 of this manual) ______________________________________________ CHECK EMERGENCY EXITS, MONTHLY:~ Two alternate exit routes are provided: right hand cab door and the skylight/emergency exit. These are only to be used if the left hand cab door cannot be opened.

It is therefore essential that these emergency exits be checked at least once per month to ensure they are fully operational.

FIRE PREVENTION Maintaining your machine properly will greatly extend its life and reduce your operating costs.

Fire can result in a machine loss which can be financially devastating.

CAUTION AFTER transporting (trucking) a machine from one job sight to the next, open all doors and access panels and blow off any debris that could have re-positioned itself onto the engine and exhaust parts due to wind turbulence caused by the journey.

1. Pine needles and bark when allowed to accumulate, form a fuel source that when ignited is extremely difficult to extinguish. A thorough program of regular cleaning and washing will reduce the possibility of a fire starting. In the event a fire does start, the regular cleaning program will improve the chances of successfully extinguishing a fire.

2. Pay close attention to wiring and plumbing routings during maintenance, ensure that ALL wiring harnesses or hydraulic hoses are properly restrained and clamped to prevent damage from chaffing.

3. If equipped, read the fire suppression system manual and have the system serviced regularly by qualified personnel.

4. In case of fire lower the boom system to the ground and shut off the engine before discharging the fire suppression system.

Also refer to FIRE PREVENTION in SECTION 1 of THIS MANUAL for additional information.

3.3

Tigercat M726D Mulcher

Lubrication and Maintenance

SCHEDULED MAINTENANCE EVERY 8 HOURS (EVERY SHIFT):~

Clean:~ • Potentially damaging limbs or sticks from machine.

• Check engine oil level • Drain fuel/water separator • Check air intake precleaner, clean as required

• Between air conditioner condensor, charge air cooler, oil cooler and radiator.

• Check air cleaner unloader valve

• Air intake (Turbo II) precleaner compartment.

• Check engine air filter restriction indicator

Check:~ • For leakage around hydraulic components and flexible hoses.

• Check hydraulic oil level • Check pump drive gearbox oil level with dipstick

• For loose nuts, bolts and fittings.

• Check transmission oil level at dipstick

• Exhaust system for leaks.

‡ Under normal conditions every 125 hours.

Under adverse conditions, mud, water, snow etc. every 8 hours.

• Condition and tension of accessory drive belt.

• Water pressure gauge in cab (60 psi) for pressurized water system.

• Lubricate mid drive shaft slip joint* 1-fitting, purge

If the water system has been operated, refer to PRESSURIZED WATER SYSTEM MAINTENANCE in THIS SECTION for refilling and charging instructions.

*Note: Lubricate mid drive shaft slip joint with machine articulated

• Lubricate front drive shaft support bearing, 1-fitting, purge

• Conduct an overall visual inspection.

• Refer to diesel engine service manual and attachment manual for additional required. maintenance at this scheduled time period.

• Lubricate center joint bearings, 2-fittings, purge • Lubricate steering cylinder ends, 4-fittings, purge • Lubricate tilt and lift cylinder ends, 8-fittings, purge • Lubricate lift boom and tilt linkage, 9 or 10 fittings, depending on attachment), purge

3.4

Tigercat M726D Mulcher

Lubrication and Maintenance

SCHEDULED MAINTENANCE EVERY 125 HOURS:~ Visually inspect for:• Frayed electrical wiring and hydraulic hose

• Perform 8 hour maintenance And in addition:~ • Lubricate rear axle pivot, 2-fittings, purge

• Wear in any other components Clean/replace:• Air conditioner re-circulation filter

• Lubricate rear drive shaft slip joint , 1-fitting, purge

• Cab fresh air filter

‡ Under normal conditions every 125 hours.

Under adverse conditions, mud, water, snow etc. every 8 hours.

• Refer to diesel engine service manual and attachment manual for additional required maintenance at this scheduled time period.

Check:• Engine coolant level

EVERY 250 HOURS:~

• Air intake primary filter element, check restriction indicator at FULL rpm

• Perform 8 hour maintenance

• Fluid level in batteries unless maintenance free

• Perform 125 hour maintenance

• Engine rpm.

And in addition replace:~ • Engine oil and change oil filter

• Hydraulic oil restriction indicator for boom/cutter circuit with engine at FULL rpm

• Engine fuel filter

• Hydraulic pump and motor securing bolts

• Air intake primary element

• Check fuel tank filler screen

• Oil in pump drive gearbox

• Torque tightening points as per new machine maintenance

• Oil in transmission • Refer to diesel engine service manual and attachment manual for additional required maintenance at this scheduled time period.

• Proper operation of pressurized water system.

(Refer to PRESSURIZED WATER SYSTEM in SECTION 2 of the OPERATOR'S MANUAL and PRESSURIZED WATER SYSTEM MAINTENANCE in THIS SECTION)

Continued on page 6

Visually check for damage to:• Lift boom and tilt linkage • Front and rear frame • Center joint area • Attachment Make repairs immediately

3.5

Tigercat M726D Mulcher

Lubrication and Maintenance

SCHEDULED MAINTENANCE Continued from page 5

EVERY 500 HOURS:~

EVERY 1000 HOURS:~

• Perform 8 hour maintenance

• Perform 8 hour maintenance

• Perform 125 hour maintenance

• Perform 125 hour maintenance

• Perform 250 hour maintenance

• Perform 250 hour maintenance

And in addition replace:~ • Air intake safety element

• Perform 500 hour maintenance

• Hyd. Oil press. Filter, drive charge press. †

And in addition replace :~ • Engine air cleaner unloader valve

• Hyd. Oil press. Filter, fan drive charge press. †

• Fuel intake strainer

• Hyd. Oil return filter, trav./steer †

• Strainer in accumulator charge valve

• Hyd. Oil return filters, cutter/boom †

Check:~ • Motion between center joint lugs

• Hyd. Oil return filter, pilot †

• Refer to diesel engine service manual and attachment manual for additional required maintenance at this scheduled time period.

• Lubricate door and door screen hinges.

Check:~ • All hydraulic pressures • Transmission mounting, Check, re-torque

EVERY 2000 HOURS:~

• Parking brake lever in cab, apply WD-40 to both sides of slide and clevis pin

• Perform 8 hour maintenance • Perform 125 hour maintenance

• Refer to diesel engine service manual and attachment manual for additional required maintenance at this scheduled time period.

• Perform 250 hour maintenance • Perform 500 hour maintenance • Perform 1000 hour maintenance And in addition replace:~ • Oil in axles, front and rear • Oil in hydraulic reservoir • Water in pressurized water system • Refer to diesel engine service manual and attachment manual for additional required maintenance at this scheduled time period.

† Use of filters other than genuine Tigercat replacement filters is not recommended.

3.6

Tigercat M726D Mulcher

Lubrication and Maintenance

SCHEDULED MAINTENANCE SEASONAL:~ Drain and refill hydraulic oil tank and both front and rear axles with recommended hydraulic oil. See "approved hydraulic oils". Also see section 8 of the service manual for axle draining procedure.

Drain and refill pressurized water system.

(Refer to PRESSURIZED WATER SYSTEM in SECTION 2 of the OPERATOR'S MANUAL and PRESSURIZED WATER SYSTEM MAINTENANCE in THIS SECTION)

APPROVED HYDRAULIC OILS In addition to providing the vehicle with its normal operational functions, hydraulic oil is also used to fill the axle assemblies, apply brakes and operate differential locks.

Wet disk brakes in the axles require oil with specific properties to ensure reduced chatter and ensure proper lubrication of mechanical components.

Use only one of the following oils to fill or replenish the hydraulic system.

Chevron

Tractor hydraulic fluid (summer)

Citgo

Tractor hydraulic fluid (33-310) (summer)

Imperial

Esso hydraul 56 (summer) Hydraul 50 (low visc) (winter)

Shell

Donax TD (summer) Donax TDL (winter)

Sun

Sunfleet th fluid (summer)

John Deere

Type J20C (hy-gardtm) (summer) Type J20D (hy-gardtm) (winter)

3.7

Tigercat M726D Mulcher

Lubrication and Maintenance

24140B R2

3.8

Tigercat M726D Mulcher

Lubrication and Maintenance ®

Tigercat Model M726D SERVICE AND LUBRICATION POINTS REFER TO Tigercat OPERATOR'S MANUAL FOR FURTHER INFORMATION

COOLING SYSTEM

2

COOLANT FILTER

3

CENTER JOINT PIVOT

LUB

4

ENGINE OIL AND FILTER CUMMINS QSC8.3

CHK

5

FUEL FILTER

6

FUEL WATER SEPARATOR

7 8

FUEL CAP SCREEN INTAKE FUEL STRAINER

9

AIR INTAKE PRECLEANER

10

AIR INTAKE PRIMARY FILTER ELEMENT AIR INTAKE SAFETY FILTER ELEMENT

11 12

2000

CAPACITY 1000

500

250

8

1

125

SERVICE POINT NO.

SERVICE EVERY ITEM

CHK

DESCRIPTION CAPACITY

42 REP

1 CHK

2

REP

20

5

REP DRN

1

CHK CHK REP

DRAIN TANK, CLEAN OR REPLACE AS NECESSARY

1

CHECK RESTRICTION INDICATOR ON INTAKE PIPE AT FULL RPM. CLEAN UNLOADER VALVE EVERY 8 HOURS. REPLACE VALVE EVERY 1000 HOURS.

1

REP † REP † REP † REP † REP †

2

17

PUMP DRIVE GEARBOX

CHK

D/R

4

1.1

18

TRANSMISSION - TIGERCAT 1 SPEED - FUNK 2 SPEED

CHK CHK

D/R D/R

5.7 4.9

1.5 1.3

19

AXLES: FRONT REAR

D/R D/R

53 31

14 8.2

20

HYDRAULIC RESERVOIR

D/R

189

50

21

PARKING BRAKE

22

ATTACHMENT

23

PRESSURIZED WATER SYSTEM

24

ACCUMULATOR CHARGE VALVE STRAINER

15

CLEAN OR REPLACE AS NECESSARY

1

REP

16

14

1

CHK CHK

CHK

CHK

CHECK MOTION BETWEEN CHASSIS LUGS SEE ENGINE MANUFACTURER'S MAINTENANCE MANUAL

1 REP

HYDRAULIC OIL FILTER * STEER/FAN/BOOM OR BOOM HYDRAULIC OIL FILTER * ATTACHMENT AND/OR FAN/STEER HYDRAULIC OIL FILTER PILOT HYDRAULIC DRIVE CHARGE PRESSURE FILTER A/C & HEATER FILTERS

13

60% ANTIFREEZE/40% DISTILLED WATER (GM6035M SPEC.)

11

2

CHECK RESTRICTION INDICATOR ON FILTER HEAD AT FULL ENGINE RPM

1 1 1

CHK

CLEAN OR REPLACE AS NECESSARY CHECK LEVEL WITH DIPSTICK. FILL WITH MIL-L-2105C OR API-GL-5 BELOW -10Fº(-23ºC) USE 75W-90 UP TO 100ºF(38ºC) USE 80W-90 ABOVE 100ºF(38ºC) USE 85W-140 DRAIN AND REFILL COMPLETE SYSTEM ANNUALLY OR AS REQUIRED SEASONALLY. MUST MEET JOHN DEERE TYPE J20C (HY-GARD) SUMMER OR TYPE J20D (HY-GARD) WINTER

CHK LUB

REFER TO SECTION 2 OF OPERATOR'S MANUAL. APPLY WD-40 TO BOTH SIDES OF SLIDE AND CLEVIS PIN ON HANDLE. SEE ATTACHMENT MANUFACTURER'S MANUAL

CHK TEST

D/R REP

CHECK SYSTEM PRESSURE, 60 PSI REFER TO SECTION 2 OPERATOR'S MANUAL. 1

* Functions for 12 and 13 depends on whether the machine is in Mulcher mode or Feller Buncher mode.

M726DLUBECHART R2.XLS

3.9

Tigercat M726D Mulcher

Lubrication and Maintenance

FILTERS - REMOVE AND REPLACE IMPORTANT Failure to service and replace filters at the proper intervals specified in the manufacturer's manuals, could cause damage to the machine and result in the product warranty becoming NULL and VOID. Check Tigercat parts catalog for replacement filters.

ELECTRIC FUEL SHUTOFF VALVE (NOT SHOWN)

•

FUEL LINE WATER SEPARATOR

Changing the filter: 1. Park machine on level ground, install articulation lock bar, lower cutting head to ground, stop engine, pull parking brake ON and block wheels.

2. Wipe clean the area around the filter and head.

3. Place rags below to catch the spillage of fuel.

4. Wearing face protection (in case of a fuel squirt).

NOTE: The fuel system is equipped with an electric fuel shut-off valve install in the outlet tube on the fuel tank. When the ignition key is turned off the fuel shut-off valve is off.

5. Remove and discard the small 1” I.D. gasket from the threaded extension on the filter head.

6. Remove the water sediment bowl from the bottom of the old filter. Discard this gasket also. Dispose of old filter and any fuel properly.

WATER SEPARATOR BOWL

•

DRAIN TAP

•

726M-039

FUEL FILTER/WATER SEPARATOR The fuel filter/water separator is a combination unit, with a replaceable fuel filter and a removable water sediment bowl on the bottom of the unit.

The water sediment bowl is only replaced if it becomes damaged or non-functional. For service and replacement intervals see SERVICE AND LUBRICATION CHART in THIS SECTION.

7. Clean the water sediment bowl.

8. Check the seating area for the gaskets on the filter head and the water sediment bowl and wipe clean.

9. Lubricate gasket for bottom of filter and water sediment bowl with clean engine oil and carefully hand tighten the water sediment bowl onto the new filter. Close the water drain valve.

10. Lubricate the new 1” I.D. gasket with clean engine oil and install onto the threaded extension on the filter head.

11. Lubricate the gasket on top of the new filter with clean engine oil.

12. Screw the new filter on to the filter head until the gasket makes contact with the seat and then hand tighten an additional 3/4 turn only.

13. Start the engine and check for leaks.

3.10

Tigercat M726D Mulcher

Lubrication and Maintenance 5. Remove the fuel strainer using the hex on the end of strainer. Carefully clean the strainer (it may be damaged by rough handling).

IMPORTANT Filters that are an integral part of the engine (fuel and lubricating oil) should be serviced and replaced according to the engine manufacturer’s operation and maintenance manual.

Tier II engine fuel injection systems require cleaner fuel than Tier I engines. To accomplish this, Tier II engines typically use filters with a finer micron rating. If the fuel supply is dirty, the fuel filter must be replaced more frequently than recommended in the owner’s manual.

Operating the machine with a clogged fuel filter will result in low engine power. It is also recommended that the fuel/water separator bowl be drained daily.

STRAINER

•

When installing a new fuel filter, DO NOT pre-fill with diesel fuel, or engine fuel pump damage will result. This type of failure is not warrantable by the engine manufacturer.

726-008.PLT

FUEL TANK STRAINER

6. Check for a buildup of foreign materials where the strainer threads on to the pipe and elbow.

To prolong the operating life of the fuel filter, ensure that the fuel supply storage tank is clean and free of water and that the fuel is pre-filtered prior to adding it to the machine.

7. Reinstall the strainer using the hex on end.

8. Reinstall fuel tank cover plate with “O” ring.

FUEL TANK STRAINER This is a stainless steel fuel strainer, screwed on to the inlet pipe of the engine fuel feed line inside at the bottom of the fuel tank.

9. Refuel and check for leaks. Start the engine and check for leaks again.

Changing or cleaning the strainer: NOTE: This should only be required if excessive quantities of foreign material has built up inside the tank.

1. Park machine on level ground, install articulation lock bar, lower cutting head to ground, stop engine, pull hand brake ON and block wheels.

2. Drain the fuel tank. (plug in bottom) 3. Remove the round fuel tank cleanout cover plate and “O” ring from the access hole.

4. Before removing the strainer, clean any debris from the bottom of the tank and wipe it clean.

3.11

Tigercat M726D Mulcher

Lubrication and Maintenance 4. Place rags below to catch the spillage of oil.

5. Wearing face protection (in case of an oil squirt), unscrew the old filter. Dispose of old filter and any oil properly.

6. Check the seating area for the gasket on the filter head and wipe it clean.

7. The Tigercat spin-on filter element is supplied with two gaskets. The M726D uses the round ('O' ring style) section gasket for all the return filters. Discard the square section gasket.

•• WATER ABSORBING ELEMENT (COLOR BLUE) 726M-044

HYDRAULIC OIL RETURN FILTERS

•

HYDRAULIC OIL RETURN FILTERS There are four full flow filters mounted on filter heads with built-in bypasses. These filters are for boom/cutter, steer/fan and low pressure return.

The steer/fan (blue) filter contains a water absorbing element. For service and replacement intervals see SERVICE AND LUBRICATION CHART in THIS SECTION.

•

FILTER HEAD

GASKET

• FILTER ELEMENT FILTR_SEALS2

CAUTION

ROUND SECTION GASKET INSTALLATION

PRESSURIZED HYDRAULIC TANK. Before servicing any hydraulic components, vent hydraulic tank. Open drain, valve loosen lock nut on regulator adjustment and turn regulator adjustment out (counter clockwise) to release all air pressure. Refer to SECTION 2 of this manual for air pressure regulator adjustment details.

8. Remove used gasket and clean gasket seat in head.

9. Apply clean oil to new round gasket surfaces.

10. Install new round section gasket into inside lip of filter.

11. Screw on new filter until filter makes contact with filter head.

Changing the filters: 1. Park machine on level ground, install articulation lock bar, lower attachment to ground, stop engine, pull parking brake ON and block wheels.

12. Tighten filter until top edge makes metal to metal contact with head. (Approximately 1 1/2 additional turns after gasket contact)

2. Drain the air supply system at the drain valve and vent the hydraulic tank. Refer to SECTION 2 of this manual for VENTING HYDRAULIC RESERVOIR procedure.

14. Start the engine and check for leaks.

13. Close the air supply system drain valve.

NOTE: Refer to SECTION 2 of this manual for AIR SUPPLY SYSTEM and AIR PRESSURE REGULATOR adjustment details.

3. Wipe clean the area around the filter and head.

IMPORTANT Contaminated hydraulic fluid can lead to premature failure of hydraulic components and costly repairs. Filters must be replaced at the recommended time intervals, Refer to SCHEDULED MAINTENANCE in THIS SECTION. Use of hydraulic oil filters other than the Tigercat brand could lead to severe wear and rapid failure of hydraulic system components.

3.12

Tigercat M726D Mulcher

Lubrication and Maintenance 7. The new filter has an attached gasket. Apply hydraulic oil to the gasket surface.

8. Screw on the new filter until the gasket makes contact with the seat in the filter head.

9. Hand tighten filter an additional 1/2 turn only.

10. Close the air supply system drain valve.

•

11. Start the engine and check for leaks.

CHARGE PRESSURE FILTER

726D-016

SET REGULATOR ADJUSTMENT TO OBTAIN 8 PSI MAX READING ON GAUGE

AIR PRESSURE REGULATOR AND GAUGE 150 PSI RELIEF VALVE AIR TOOL SUPPLY CONNECTOR

CHARGE PRESSURE FILTER

HYDROSTATIC CHARGE PUMP PRESSURE FILTERS

726M-O12

There are two other full flow filters mounted on filter heads with built-in bypasses. One is in the output side of the hydrostatic drive charge pump and the other is the low pressure and pilot return.

For service and replacement intervals see SERVICE AND LUBRICATION CHART in THIS SECTION.

•

•• ••

DRAIN VALVE

•

•

HYDRAULIC OIL TANK AIR PRESSURE REGULATOR

NOTE: Refer to SECTION 2 of this manual for AIR SUPPLY SYSTEM and AIR PRESSURE REGULATOR adjustment details.

HYDRAULIC FILTER SERVICING GUIDELINES FOR M726D MULCHERS

CAUTION PRESSURIZED HYDRAULIC TANK. Before servicing any hydraulic components, vent hydraulic tank. Open drain valve, loosen lock nut on regulator adjustment and turn regulator adjustment out (counter clockwise) to release all air pressure. Refer to SECTION 2 of this manual for air pressure regulator adjustment details.

IMPORTANT

NEVER PRE-FILL ANY HYDRAULIC FILTERS ON M726D MULCHERS

Changing the filters: 1. Park machine on level ground, install articulation lock bar, lower attachment to ground, stop engine, pull parking brake ON and block wheels.

2. Drain the air supply system at the drain valve and vent the hydraulic tank. Refer to SECTION 2 of this manual for VENTING HYDRAULIC RESERVOIR procedure.

3. Wipe clean the area around the filter and head.

4. Place rags below to catch the spillage of oil.

5. Wearing face protection (in case of an oil squirt), unscrew the old filter. Dispose of old filter and any oil properly.

6. Check the seating area for the gasket on the filter head and wipe it clean.

3.13

Tigercat generally does not recommend the prefilling of spin-on filters due to the risk of damage to the hydraulic system caused by unfiltered oil.

Unfiltered oil used to pre-fill filters enters directly into the hydraulic circuit. Contaminants in unfiltered oil can cause significant and costly damage to hydraulic valves, pumps and motors.

The cleanliness of hydraulic oil cannot be guaranteed unless it is always prefiltered before use.

Tigercat M726D Mulcher

Lubrication and Maintenance

AIR CLEANER MAINTENANCE

AIR CLEANER

726D-008

ENGINE AIR CLEANER

726D-007

The air cleaner on this machine uses two filter elements; a primary element and a safety element accessible in the hydraulic pump compartment.

AIR INTAKE PRECLEANER

ENGINE AIR PRECLEANER The engine air precleaner cleans engine air before it reaches the air cleaner filter elements. It removes contaminants such as dust, powder, insects, rain and snow. This precleaner is self powered and self cleaning requiring virtually no maintenance. However, it should be checked periodically to make sure that foreign materials have not plugged the intake area or the exhaust port area.

To ensure maximum engine protection, it is important that the elements be serviced correctly and at proper servicing intervals.

NOTE: The precleaner compartment should be checked and cleaned out daily to ensure proper operation of the precleaner.

AS THE AIR SPINS, CENTRIFUGAL FORCE SEPARATES FOREIGN MATERIALS FROM THE CLEAN AIR

FILTER RESTRICTION INDICATOR

•

CONTAMINANTS ARE BLOWN OUT OF SPECIAL DISCHARGE PORTS BY HIGH VELOCITY, AIR POWERED ROTOR

•

726D-020

FILTER RESTRICTION INDICATOR

A filter restriction indicator is mounted to the output side of the air cleaner. This should show green when the engine is running at FULL RPM. Service is required only if the indicator shows red.

• • • • THE TURBO II PRECLEANER HAS SPECIALLY DESIGNED BLADES THAT CAUSE THE INCOMING AIR TO SPIN TURBO 2

ONLY THE PURIFIED AIR GOES TO THE AIR FILTER

TURBO II PRECLEANER OPERATION

726D-008

UNLOADER VALVE

AIR CLEANER UNLOADER VALVE

AIR CLEANER UNLOADER VALVE This rubber valve on the body of the air cleaner housing should be checked before every shift (8 hours). If this valve is missing, damaged or has turned hard, it will cause the air cleaner to become ineffective. The valve should suck closed at 1/3 throttle.

3.14

Tigercat M726D Mulcher

Lubrication and Maintenance

This valve should be replaced every 1000 hours or when damaged. Remove the unloader valve from the tube of the air cleaner housing. Check and clean the valve. A good valve is soft and flexible. If plugged, be sure to check the filter elements as they may need replacing as well.

Reattach the valve to the body.

• SAFETY ELEMENT

When operating in high dust conditions, the unloader valve should be checked and squeezed every 2 hours to release dust buildup.

In addition to the LUBRICATION AND MAINTENANCE SCHEDULE outlined in THIS SECTION, the following instructions should also be noted: The most common and damaging servicing problems are:

•

OVER SERVICING Filter elements increase in dust cleaning efficiency as dust builds up on the media. Looks can be deceiving. A filter that looks dirty may actually be more efficient than one that is clean. A filter with dust build up on the media reaches nearly 100% dust cleaning efficiency. Only when a filter is so clogged with dirt that air restriction goes beyond engine manufacturer's guidelines, should a filter be replaced.

NOTE: This does not apply to hydraulic oil or diesel engine oil filters.

SERVICING Engine exposure to dust during servicing is a large reason for engine damage due to dust.

Abrasive dust can easily enter the intake system once the air cleaner cover and protective filter element are removed for replacement. The safety element does reduce this risk but it should also be replaced at every third primary element change.

AIR CLEANER .PLT

PRIMARY ELEMENT

AIR FILTER ELEMENTS

IMPORTANT STEPS TO FOLLOW WHEN CHANGING FILTER ELEMENTS 1. Release the cover latch gently to reduce the amount of dust dislodged.

2. Avoid dislodging dust from filter element(s) by gently pulling the element off the outlet tube.

3. Check your old filter sealing surfaces, This will help detect foreign material on the sealing surface that is causing leakage.

NOTE: Filter elements should never be cleaned and reused. Cleaning causes dust to bypass the filter and be deposited on the inner surface of the filter media. The dust is then drawn directly into the engine.

4. Always clean the inside of the outlet tube.

5. Always clean the sealing surface of the outlet tube before inserting a new filter element.

6. Inspect the new filter for damage.

7. Insert the new filter properly. Apply pressure to the outer rim of the filter not the flexible centre.

8. Check connections and ducts for an air tight fit. Ensure that all clamps, bolts and connections are tight. Check rubber elbows for splits or wear points. Leaks in these locations send dust directly to the engine.

3.15

Tigercat M726D Mulcher

Lubrication and Maintenance

PRESSURIZED WATER SYSTEM MAINTENANCE

FILL & CHARGE PRESSURIZED WATER SYSTEM

OPERATION:

1. Open water shut off valve and completely discharge all water and compressed air from the tank via the hose end nozzle.

Turn the hand operated ball valve (shut off valve) under the seat to the ON position to draw water from the 10.5 USgallon (39.7 liter) pressurized holding tank at the rear of the machine. When not in use turn the water supply OFF at this valve and relieve the pressure in the rubber hose, under the operator's seat.

HOSE

CAUTION Never remove fill plug before de-pressurizing tank or injury may result. This fill plug incorporates a vent hole to release air pressure from the tank before the threads disengage. DO NOT replace this fill plug with any substitute.

WATER SHUT OFF VALVE (SHOWN CLOSED)

9

••

196-16A

••

•

PRESSURIZED WATER SYSTEM CONTROL VALVE (UNDER SEAT)

The pressure gauge on the side of the seat should read 60 psi.

••

AIR CHARGE VALVE

TANK FILL PLUG

•

726D-44

2. Slowly unscrew fill plug two full turns. Any remaining air in the tank will be heard expelling from the special fill plug. Do not remove fill plug until all air has been expelled.

•• PRESSURE GAUGE

196-9A

PRESSURIZED WATER SYSTEM

3. Close water shut off valve.

PRESSURIZED WATER SYSTEM

Refer also to FIRE PREVENTION in SECTION 1 of THIS MANUAL.

4. Fill tank with water. Tank capacity is approximately 10.5 USgallons (39.7 liters) When temperatures below 32°F are anticipated, use a 60/40 solution of Nontoxic R. V. Antifreeze or other suitable antifreeze.

Antifreeze solution must meet GM 6038M specifications.

SYSTEM TEST: This system should be tested once every month by turning the shut-off valve ON and expelling water from the hose end nozzle. A very forceful discharge of water should be obtained. If the water does not come out with force (with pressure gauge reading 60 psi) the system needs to be PURGED. Refer to PURGING PRESSURIZED WATER SYSTEM in THIS SECTION. After testing, the tank must be refilled and pressurized to 60 psi. Refer to the following FILL AND CHARGE procedure. This FILL AND CHARGE procedure should be carried out yearly.

NOTE: Most Nontoxic RV Anti freeze solutions contain corrosion and algae inhibitors, it is therefore suggested that this solution be added to the water on a continual basis regardless of temperature conditions.

5. Install fill plug in tank.

3.16

NOTE: This is a special plug designed to withstand pressurization of the water tank. Do not substitute.

Tigercat M726D Mulcher

Lubrication and Maintenance

6. Pressurize the system to 60 psi as indicated on pressure gauge by connecting an air hose to air charge valve beside the pressure gauge.

PURGING PRESSURIZED WATER SYSTEM

7. Open the water shut off valve 8. Discharge about 1/2 US gallon (2 liters) of fluid into an empty antifreeze jug or other suitable container.

There will be significant foaming as the fluid is discharged into the jug. Continue until a very forceful flow is obtained and any contamination that may have been in the tank is flushed from the system.

Purging should be carried out whenever the flow of water does not forcefully discharge from the end of the hose with the pressure gauge reading 60 psi.

1. Open water shut off valve and completely discharge all water and compressed air from the tank via the hose end nozzle.

CAUTION Never remove fill plug before depressurizing tank or injury may result. This fill plug incorporates a vent hole to release air pressure from the tank before the threads disengage. DO NOT replace this fill plug with any substitute.

9. Check fluid in the jug for contamination. If fluid is dirty dispose of it properly.

10. Close the water shut-off valve.

11. Release pressure and fluid from the hose.

12. Pressurize the system to 60 psi as indicated on pressure gauge by connecting an air hose to air charge valve beside the pressure gauge.

13. Return the hose to its storage location.

2. Slowly unscrew fill plug two full turns. Any remaining air in the tank will be heard expelling from the special fill plug. Do not remove fill plug until all air has been expelled.

3. Close the water shut off valve and add 2 USgallons (8 litres) of clean water to the tank.

4. Install fill plug in tank.

NOTE: This is a special plug designed to withstand pressurization of the water tank. Do not substitute.

5. Pressurize the system to 60 psi as indicated on pressure gauge by connecting an air hose to air charge valve beside the pressure gauge.

6. Open the shut off valve and completely discharge all the water in the tank via the hose end nozzle.

7. Discharge all the water into an empty antifreeze jug or other suitable container.

There will be significant foaming as the fluid is discharged into the jug. Continue until a very forceful flow is obtained and any contamination that may have been in the tank is flushed from the system.

8. If a forceful discharge was not achieved, repeat the purging procedure. If a second purging does not work, remove lines and check for an obstruction.

9. After the purging operation, fill and charge the system as described in FILL & CHARGE PRESSURIZED WATER SYSTEM in THIS SECTION.

3.17

Tigercat M726D Mulcher

Lubrication and Maintenance

CHECKING THE AIR CONDITIONING SYSTEM

IMPORTANT

Any service work must be performed by authorized A/C technicians. The system should be charged with R134a refrigerant only. PAG (polyalkeylene glycol) oil should be present in the system and must be used on 'O' ring fittings during assembly.

It is recommended that during cold weather when the A/C system is not in use, that it be run for a period of 5 minutes every 2 weeks. This will circulate oil to all components of the A/C system.

AIR CONDITIONING TOTAL SYSTEM VOLUME R134a Refrigerant

PAG Oil

2 LBS. 12 OZ.

7 OZ.

CAUTION • If using compressed air for cleaning, use at 30 psi or less.

• Always use personal protective equipment to guard against flying debris.

7850AR1

The compressor and charge valves and receiver drier are accessed from the left side engine compartment. The evaporator core is accessed on the left hand side of the machine.

Use this checklist to maintain system between service intervals. a. Check and adjust compressor drive belt tension. b. Check air intake filters and clean as required. c.

Check the condenser core for dirt and debris.

Clean as required. Refer to CLEANING A/C CONDENSER AND COOLING ASSEMBLY in SECTION 2 of the OPERATOR'S MANUAL.

726D-031

d. Check the evaporator core and the inside of the A/C housing for dirt and debris. Clean as required. e. Run air conditioning system for 3 - 5 minutes. f.

Check to see that compressor clutch will engage.

CHECK A/C CONDENSER CORE

CAUTION Use compressed air for cleaning only when the machine is cold to avoid the risk of fire caused by debris contacting hot surfaces.

If using compressed air for cleaning, use at 30psi or less.

Always use personal protective equipment to guard against flying debris

CAUTION Avoid the risk of fire caused by debris accumulating on surfaces that may become hot during machine operation. Always use care when cleaning to ensure that debris removed from one area of the machine does not accumulate on other areas of the machine.

3.18

Tigercat M726D Mulcher

Lubrication and Maintenance

CENTER JOINT

TRANSMISSION:

MAINTENANCE OF CENTER JOINT Maintenance in this area is usually limited to:

By carefully following these procedures, the service life of the transmission will be extended and costly down time will be avoided.

a) Regular lubrication of the two center joint grease fittings to purge the pivot bearings of debris and water. Refer to SERVICE AND LUBRICATION POINTS in THIS SECTION for lubrication intervals. Use only high quality, lithium based EP2 grease containing molybdenum disulphide.

For additional information, refer to TRANSMISSION in SECTION 8 of the SERVICE MANUAL. TRANSMISSION OIL LEVEL DIPSTICK

b) Visually checking the center joint pivot for looseness every 1000 hours. With an observer on the ground, keeping well clear of the center joint area, perform the following test to check for looseness of center joint.

•• TRANSMISSION OIL FILL PLUG

1. Have operator lift the attachment off the ground and then rapidly raise and lower the head several times to "bounce" machine.

2. As machine bounces, check for motion between the front and rear chassis frame lugs. Also check for a "clunking" sound at the center joint area.

REAR CHASSIS

CHECK TRANSMISSION OIL LEVEL

CHECK OIL LEVEL Check oil level at end of every 8 hour shift.

Procedure: • Park on level ground, lower attachment, set parking brake on and turn off engine.

•

Clean dirt and debris from around oil dipstick and check oil level.

•

If required: add the recommended grade of oil through oil fill plug located on top of transmission housing.

FRONT CHASSIS

CHECK FOR MOVEMENT IN THIS JOINT AREA

724D-D11

726M-018

•

Do not overfill.

1000 HOUR CHECK

3. Movement between front and rear chassis lugs or clunking of the pivot indicates a loose joint and preload must be checked.

Refer SECTION 11 of the SERVICE MANUAL for more information..

3.19

Tigercat M726D Mulcher

Lubrication and Maintenance

START-UP PROCEDURE AFTER MAJOR MACHINE MAINTENANCE This procedure should be followed: •

After major service or a rebuild.

•

Whenever the machine has been drained of hydraulic oil.

•

When any major component has been removed, repaired or replaced.

PRE-STARTUP AND FILLING 1. Check oil levels in the engine, the pump drive gearbox and the transmission.

2. Check coolant level in the radiator.

3. Do a final inspection of all fittings and clamps to make sure they are tight and will not leak.

4. Install the articulation lock bar and apply the parking brake.

5. Turn both differential lock switches to OFF. 6. Do not start engine. Purge air from hydraulic system as follows: •

Fill the hydraulic tank if it has been drained.

•

Ensure all filters are in place.

•

Fill all hydraulic pumps and motors with hydraulic oil through the case drain ports.

NOTE: If the axles were drained of oil, refer to FILLING THE AXLES in SECTION 8 of THE SERVICE MANUAL.

3.20

Tigercat M726D Mulcher

Lubrication and Maintenance

MACHINE START-UP

CAUTION

Before beginning this procedure, perform the PRE START-UP AND FILLING steps.

Machine operator must ONLY take directions from the person doing the set-up.

1. Ensure the articulation lock bar is installed.

INSTALL A 0-1000 PSI. GAUGE AT ‘G’ PORT.

DISCONNECT 23 PIN CONNECTOR

• DRIVE PUMP

••

726D-017

•

DISCONNECT 23 PIN CONNECTOR

2. Disconnect the engine 23 pin connector (prevents engine starting).

3. Crank engine for 3 seconds, wait for 5 seconds. Repeat 5 times to pump oil into pumps.

4. Reconnect the 23 pin connector. Do not start engine.

DRIVE PUMP 'G' TEST PORT CONNECTION 5. Remove protective cap and install a 0-1000 psi. gauge on drive pump to check charge pressure at ‘G’ port. Watch gauge closely during startup.

724M-004

6. Start engine. If charge pressure does not rise within 20 to 30 seconds, TURN ENGINE OFF. If charge pressure is between 420 and 450 psi., run engine at IDLE for 20 minutes.

Check engine oil pressure in cab. Do not operate any functions.

7. Remove pressure gauge from 'G' port.

8. Install a 0 - 1000 psi. gauge on pilot manifold. ("P2" on right side, quick connect fitting)

INSTALL A 0 - 1000 PSI. GAUGE ON "P2" PORT

PILOT PRESSURE RELIEF VALVE 675 PSI.

•

• •

PILOT PRESSURE REDUCING VALVE 550 PSI. 726D-019

PILOT MANIFOLD

3.21

Tigercat M726D Mulcher

•

•

Lubrication and Maintenance 18. Set throttle to IDLE and run each BOOM function for 2 minutes to purge air from circuit.

PILOT PRESSURE RELIEF VALVE 675 PSI.

19. Set throttle to FULL and run each BOOM function again for 2 minutes to flush circuit.

20. At FULL throttle, operate all other functions for 2 minutes to flush circuits.

21. Top up the radiator with clean coolant. With cylinders fully retracted, top up the hydraulic oil reservoir with clean hydraulic oil.

PILOT PRESSURE REDUCING VALVE 550 PSI.

NOTE: If the machine was on wheels, the steer and drive functions were not properly purged or flushed. Remove the articulation lock bar and at LOW IDLE, slowly operate the steer function right and left a few times. With the parking brake released and at LOW IDLE, slowly operate the drive function forward and reverse a few times.

PILOT MANIFOLD

726D-019

9. Turn pilot pressure reducing valve (far left end, top of pilot manifold) all the way IN until it is lightly seated.

10. Adjust pilot pressure relief valve (second from left, top of pilot manifold) using gauge and set to 675 psi. and lock.

NOTE: If possible, allow the machine to stand for 4 to 6 hours before setting any of the operating pressures. This will allow any air bubbles in the oil to escape and is a good time to check for leaks.

11. Using same gauge, reset pilot pressure reducing valve to 550 psi. and lock.

12. Remove pressure gauge from the pilot manifold.

IMPORTANT Without an attachment installed, the tilt function can cause damage to the arms.

Watch the two LINK ARMS very carefully, as they may drop down beside the boom arms and wedge, causing the crank arms to bend.

When necessary, lower the boom DOWN, watching closely and tilt FORWARD, again watching the link arms closely.

STEER CIRCUIT MAIN RELIEF 2500 PSI.

•• ••

CRANK, LINK AND BOOM ARMS INSTALL A 0-5000 PSI. GAUGE

726D-O52

STEER CIRCUIT MAIN RELIEF VALVE

CRANK ARM LINK ARM

••

13. Install a 0-5000 psi. gauge on steer circuit main relief (quick connect fitting).

•

14. Set steer relief to 2500 psi. on gauge.

15. With engine at IDLE, parking brake ON, hold foot brake down, bleed brakes in rear axle.

BOOM ARM

16. Remove pressure gauge from steer relief valve.

•

17. Turn both differential locks ON and run engine at IDLE for 30 minutes to purge air and fill axles with oil (axles fill with leakage from diff. locks). If wheels have been removed, operate forward and reverse pedals very slowly to fill axles with oil.

3.22

192-21A

Tigercat M726D Mulcher

Lubrication and Maintenance

REPLACING THE ENGINE SERPENTINE BELT 1. Park the machine on level ground. Parking brake ON, attachment resting on the ground and engine off. Turn battery disconnect switch OFF.

••

SERPENTINE BELT

••

BELT TENSIONER

726D-007PLT

REMOVING SERPENTINE BELT

2. Install a Johnson bar with a 3/8" square drive in the square socket hole of the belt tensioner.

3. Loosen belt tensioner and remove the serpentine belt.

4. Replace the serpentine belt. Ensure that all of the ribs on the serpentine belt align with the grooves on the engine pulleys.

3.23

Tigercat M726D Mulcher

Lubrication and Maintenance

MIDDLE AND REAR DRIVE SHAFT SPLINE LUBRICATION When operating in extremely wet or dusty conditions or when the regular service schedule has been neglected, insufficient lubrication to the spline area of the middle drive shaft will result in premature wear. In addition old grease often forms into a semi-solid, rubber-like plug preventing the purging of contaminants (water, dirt, sand, etc.) through the slip spline seal.

2

•• •

The most common cause of joint and slip spline failure is lack of proper lubrication.

726M-008

1

MIDDLE SLIP SPLINE

MIDDLE SLIP SPLINE LUBRICATION 1. Park machine on level ground, and steer fully to the right. Lower attachment to the ground.

Set parking brake ON. 2. Stop the engine.

3. Apply grease to grease nipple (1) until new, clean grease exits from the relief fitting (2).

1

•• •

2

726M-011

Check to see if grease is exiting from the relief fitting (2). If grease does not exit from the relief fitting, remove the relief fitting and apply grease at the grease nipple. If grease flows out of relief fitting hole replace relief fitting.

If grease does not exit from the relief fitting hole, remove drive shaft and inspect for "hardened" grease build up, rust or other contaminants within the drive shaft. Repair or Replace drive shaft.

3.24

Tigercat M726D Mulcher

Lubrication and Maintenance GREASE GUN

• •

1

• 726M-012

726M-009

REAR SLIP SPLINE

REAR SLIP SPLINE LUBRICATION GREASE APPEARS AT RELIEF HOLE

4. Apply grease to grease nipple (1) until new, clean grease appears at the relief hole at yoke end of slip spline, FIG. 'C'.

720C-01

FIG. 'C' REAR DRIVE SHAFT YOKE END

5. Plug or cover relief hole and continue to apply pressure to grease nipple until new, clean grease appears at slip spline seal.

6. If grease does not appear at slip spline seal and continues to exit from the covered relief hole, remove the drive shaft and inspect for "hardened" grease build up, rust or other contaminants within the drive shaft. Repair or Replace drive shaft.

3.25

Tigercat M726D Mulcher

Lubrication and Maintenance

SPEED CONTROL LEVER ADJUSTMENT The friction setting on the speed control lever is variable and can be adjusted to allow proper operation.

The friction setting on the speed control lever may require adjustment, during normal operation, to maintain the set position of the lever, especially at maximum throw.

FRICTION SETTING PROCEDURE Before starting work, read and follow all servicing safety precautions in SECTION 1 of THIS MANUAL. 1. Park machine on level ground, apply parking brake, lower attachment to ground, shut off engine.

2. Position the speed control lever in the neutral position (pointing straight up).

M724D-02

3. Raise the protective rubber ‘boot’ from the speed control valve body.

SPEED CONTROL LEVER

4. Locate the adjustable friction set screw.

5. Tighten the adjustable friction set screw as required (2.5mm hex key)

SPEED CONTROL LEVER

6. Replace the protective rubber ‘boot’ over the speed control valve body.

• PROTECTIVE RUBBER BOOT

• ADJUSTABLE FRICTION SET SCREW

••

CONTROL PANEL

••

630B-31

3.26

SPEED CONTROL LEVER FRICTION SET SCREW LOCATION

Tigercat M726D Mulcher

Lubrication and Maintenance

TORQUE CHART LOCATION

THREAD DIAMETER

Cylinders Pin bolts Piston nut, steer cyl.

Piston nut, boom/tilt cyl.

Gland, steer cyl.

Keeper plate bolts

TORQUE (LUBRICATED) lbf-ft Nm

3/4" UNC 1 1/4" UNF 1 1/2" UNF 3/4" UNC

282-310 930 1640 450 282-310

393-420 1282 2260 620 389-420

1/2" UNC 3/4" UNC

80-88 282-310

109-119 393-420

Engine mounting Bolts, mount to chassis Bolts, brackets to engine Bolts, bracket to pump drive

7/8" UNC M12-1.75 (10.9) 5/8" UNC

364 75 159-175

500 100 216-237

Pump drive gearbox Drive plate to flywheel Bell housing to CUMMINS engine

M10 x 1.5 (10.9) M10 x 1.5 (10.9)

32 32

43 43

1 1/4" x 18 UNEF 3/4" UNC

475-525 357

644-711 484

1/2" UNF 1/2" UNF 3/8" UNF

120-132 120-132 37-49

163-179 163-179 50-66

Axle mounting bolts Front Rear

7/8" UNC 3/4" UNC

364 226

500 310

Wheel bolts

7/8" UNF

500-550

679-745

Transmission housing to frame

7/8" UNC

364

500

Center joint bearing Bearing retaining bolts Pin retaining bolts

Drive shafts Yoke retaining nut, front shaft Pillow block retaining bolts Universal joint bolts Rear & Mid. drive shaft Front drive shaft to Mid. drive shaft Front drive shaft to axle

Torque values pertaining to the engine and attachment are provided in the appropriate manuals.

724D-TORQUECHART.XLS

3.27

Tigercat M726D Mulcher

Lubrication and Maintenance

GENERAL TORQUE SPECIFICATIONS The torque values listed below are for general use only.

DO NOT use these values if a different torque value or tightening procedure is shown for a specific application.

IMPERIAL GRADE 8 BOLTS

GRADE 5 BOLTS

IMPERIAL BOLT TORQUE SPECIFICATIONS GRADE 5 BOLTS GRADE 8 BOLTS COARSE THREAD 1/4" - 20 5/16" - 18 3/8" - 16 7/16" - 14 1/2" - 13 9/16" - 12 5/8" - 11 3/4" - 10 7/8" - 9 1" - 8 1 1/8" - 7 1 1/4" - 7 FINE THREAD 1/4" - 28 5/16" - 24 3/8" - 24 7/16" - 20 1/2" - 20 9/16" - 18 5/8" - 18 3/4" - 16 7/8" - 14 1" - 12 1 1/8" - 12 1 1/4" - 12

DRY lbf-ft Nm 11 - 12 15 - 16 20 - 28 27 - 38 44 -48 60 - 65 70 - 77 95 - 104 106 - 117 144 - 158 153 - 168 208 - 228 212 - 233 288 - 316 376 - 414 510 - 561 606 - 667 822 - 904 909 - 1000 1233 - 1355 1288 - 1417 1746 - 1921 1817 - 1999 2464 - 2710 DRY lbf-ft Nm 13 - 14 18 - 19 23 - 28 31 - 38 49 - 54 67 - 73 78 - 86 106 - 116 120 - 132 163 - 179 171 - 188 232 - 255 240 - 264 326 - 358 420 - 462 570 - 626 668 - 735 906 - 996 995 - 1096 1359 - 1486 1445 - 1590 1960 - 2155 2012 - 2213 2728 - 2997

LUBRICATED lbf-ft Nm 8 - 10 11 - 13 26 - 30 35 - 40 33 - 36 45 - 49 52 - 57 71 - 77 80 - 88 109 - 119 115 - 127 156 - 172 159 - 175 216 - 237 282 - 310 393 - 420 455 - 501 617 - 679 682 - 750 925 - 1016 966 - 1062 1310 - 1441 1360 - 1496 1844 - 2027 LUBRICATED lbf-ft Nm 10 - 13 14 - 17 18 - 25 25 - 33 37 - 41 50 - 55 58 - 64 79 - 86 90 - 99 122 - 134 128 - 141 174 - 191 180 - 198 244 - 268 315 - 347 427 - 470 501 - 550 679 - 745 746 - 821 1012 - 1113 1083 - 1191 1469 - 1613 1509 - 1660 2046 - 2250

DRY LUBRICATED COARSE lbf-ft Nm lbf-ft Nm THREAD 1/4" - 20 7- 8 10 - 11 8 - 10 11 - 13 5/16" - 18 14 - 18 19 - 24 38275 13 - 20 3/8" - 16 31 - 34 42 - 46 23 - 25 31 - 34 7/16" - 14 49 - 54 66 - 73 37 - 41 50 - 55 1/2" - 13 75 - 83 102 - 112 57 - 63 77 - 85 9/16" - 12 109 - 120 148 - 162 82 - 90 111 - 122 5/8" - 11 150 - 165 204 - 223 113 - 124 152 - 168 3/4" - 10 266 - 293 360 - 397 200 - 220 271 - 298 7/8" - 9 394 - 433 535 - 586 296 - 326 402 - 441 1" - 8 591 - 649 802 - 879 443 - 489 601 - 663 1 1/8" - 7 794 - 873 1077 - 1183 596 - 656 808 - 889 1 1/4" - 7 1120 - 1232 1519 - 1670 840 - 924 1139 - 1252 FINE DRY LUBRICATED lbf-ft Nm lbf-ft Nm THREAD 1/4" - 28 9 - 10 12 - 13 9 - 10 12 - 13 5/16" - 24 17 - 22 23 - 29 16 - 20 21 - 27 3/8" - 24 35 - 39 48 - 53 26 - 29 35 - 39 7/16" - 20 55 - 61 75 - 83 41 - 45 56 - 61 1/2" - 20 85 - 94 116 - 127 64 - 70 87 - 95 9/16" - 18 121 - 133 164 - 180 91 - 100 124 - 135 5/8" - 18 170 - 187 231 - 253 128 - 141 174 - 191 3/4" - 16 297 - 327 403 - 443 223 - 245 303 - 332 7/8" - 14 434 - 477 589 - 646 326 - 359 442 - 486 1" - 12 646 - 711 876 - 965 484 - 534 657 - 724 1 1/8" - 12 891 - 980 1208 - 1328 668 - 735 906 - 996 1 1/4" - 12 1240 - 1364 1682 - 1849 931 - 1024 1262 - 1387

METRIC

METRIC BOLT TORQUE SPECIFICATIONS SIZE

CLASS 4.8 LUBRICATED DRY Nm lbf-ft Nm lbf-ft

CLASS 8.8 OR 9.9 LUBRICATED DRY Nm lbf-ft Nm lbf-ft

CLASS 10.9 LUBRICATED DRY Nm lbf-ft Nm lbf-ft

CLASS 12.9 LUBRICATED DRY Nm lbf-ft Nm lbf-ft

M6 M8 M10

4.8 12.0 23.0

3.5 8.5 17.0

6.0 15.0 29.0

4.5 11.0 21.0

9.0 22.0 43.0

6.5 16.0 32.0

11.0 28.0 55.0

8.5 20.0 40.0

13.0 32.0 63.0

9.5 24.0 47.0

17.0 40.0 80.0

12.0 30.0 60.0

15.0 37.0 75.0

11.5 28.0 55.0

19.0 47.0 95.0

14.5 35.0 70.0

M12 M14 M16

40.0 63.0 100.0

29.0 47.0 73.0

50.0 80.0 125.0

37.0 60.0 92.0

75.0 120.0 190.0

55.0 88.0 140.0

95.0 150.0 240.0

70.0 110.0 175.0

110.0 175.0 275.0

80.0 130.0 200.0

140.0 225.0 350.0

105.0 165.0 225.0

130.0 205.0 320.0

95.0 150.0 240.0

165.0 260.0 400.0

120.0 190.0 300.0

M18 M20 M22

135.0 190.0 260.0

100.0 140.0 190.0

175.0 240.0 330.0

125.0 180.0 250.0

260.0 375.0 510.0

195.0 275.0 375.0

330.0 475.0 650.0

250.0 350.0 475.0

375.0 530.0 725.0

275.0 400.0 540.0

475.0 675.0 925.0

350.0 500.0 675.0

440.0 625.0 850.0

325.0 560.0 460.0 800.0 625.0 1,075.0

410.0 580.0 800.0

M24 M27 M30

330.0 490.0 675.0

250.0 360.0 490.0

425.0 625.0 850.0

310.0 650.0 450.0 950.0 625.0 1,300.0

M33 900.0 M36 1,150.0

475.0 825.0 600.0 925.0 675.0 1,150.0 850.0 1,075.0 800.0 1,350.0 1,000.0 700.0 1,200.0 875.0 1,350.0 1,000.0 1,700.0 1,250.0 1,600.0 1,150.0 2,000.0 1,500.0 950.0 1,650.0 1,200.0 1,850.0 1,350.0 2,300.0 1,700.0 2,150.0 1,600.0 2,700.0 2,000.0

675.0 1,150.0 850.0 1,750.0 1,300.0 2,200.0 1,650.0 2,500.0 1,850.0 3,150.0 2,350.0 2,900.0 2,150.0 3,700.0 2,750.0 850.0 1,450.0 1,075.0 2,250.0 1,650.0 2,850.0 2,100.0 3,200.0 2,350.0 4,050.0 3,000.0 3,750.0 2,750.0 4,750.0 3,500.0

TORQUECHARTGENERAL.XLS

3.28

Tigercat M726D Mulcher

Lubrication and Maintenance

PRESSURE SETTINGS M726D With hydraulic oil at operating temperature (120°F - 140°F) Location

Pressure (PSI)

Engine RPM

Engine RPM 1920 ± 25 High Idle 850 ± 25 Low Idle

Pilot Manifold Pressure Relief Valve Pressure Reducing Valve

675 550

850 850

Drive Pump - Single Motor Two Speed Charge Pressure Relief Valve Multi Function Valve: · P.O.R. Forward · P.O.R. Reverse · High Pressure Relief Forward · High Pressure Relief Reverse

450

1380

5050 5050 5650 5650

1800 1800

Drive Motor - Single Motor Two Speed Drive Motor P.O.R.

4450

1800

Steer Valve (Joystick Steering Only) Steer Valve Main Relief Steer Right Port Relief Steer Left Port Relief

2500 3200 3200

1800 850 850

Attachment Circuit Mulching Head Spike Relief Cutter Control Vavle Main Relief Pump P.O.R. Saw Mode Remote P.O.R. Load Sense Standby Differential Pressure

Early Machines 5800 5500 5000 NA 600 NA

Boom Valve Inlet Main Relief Tilt In Port Relief Tilt Out Port Relief Accumulator Clamp Open Port Relief Accumulator Clamp Close Port Relief Clamp Open Port Relief Clamp Close Port Relief Boom Lift Port Relief Boom Lower Port Relief

Later Machines 5600 5300 4800 3600 NA 218 2600 2900 2900 3200 3200 1100 3200 2900 2200

1200 1200 1200 1200 1200 1200 1800 850 850 850 850 850 850 850 850

IMPORTANT NOTES: ~ Boom support must be used part# 4128A ~ When performing tilt out function, without an attachment installed, do not allow crank arms to hit boom Early Machines - Serial Number 726M3001 to 726M3020 ~ Later Machines - Serial Number 726M3021 And Up PRESSURE SETTINGS R3

3.29

Tigercat M726D Mulcher

Lubrication and Maintenance

ELECTRICAL SCHEMATIC - SHEET 1 OF 3 ~ SERIAL NUMBER 726M3001 TO 726M3020

26226BS1.DWG 726M-015

3.30

Tigercat M726D Mulcher

Lubrication and Maintenance

ELECTRICAL SCHEMATIC - SHEET 2 OF 3 ~ SERIAL NUMBER 726M3001 TO 726M3020

26226BS2.DWG 726M-016

3.31

Tigercat M726D Mulcher

Lubrication and Maintenance

ELECTRICAL SCHEMATIC - SHEET 3 OF 3 ~ SERIAL NUMBER 726M3001 TO 726M3020

26226BS3.DWG 726M-017

3.32

Tigercat M726D Mulcher

Lubrication and Maintenance

ELECTRICAL SCHEMATIC - SHEET 1 OF 3 ~ SERIAL NUMBER 726M3021 AND UP

27288BS1.DWG 726M-032

3.33

Tigercat M726D Mulcher

Lubrication and Maintenance

ELECTRICAL SCHEMATIC - SHEET 2 OF 3 ~ SERIAL NUMBER 726M3021 AND UP

27288BS2.DWG 726M-031

3.34

Tigercat M726D Mulcher

Lubrication and Maintenance

ELECTRICAL SCHEMATIC - SHEET 3 OF 3 ~ SERIAL NUMBER 726M3021 AND UP

27288BS3.DWG 726M-025

3.35

Tigercat M726D Mulcher

Lubrication and Maintenance

3.36

Tigercat M726D Mulcher SECTION 5 - PILOT SYSTEM MARCH, 2006

CONTENTS - SECTION 5 ACCUMULATOR CHARGE VALVE ................................................................... 2 OPERATING DESCRIPTION .......................................................................... 2 REPLACE FILTER .......................................................................................... 8 SCHEMATIC .................................................................................................. 2 ACCUMULATORS ............................................................................................. 3 BRAKE ACCUMULATOR ............................................................................... 3 CHARGING .................................................................................................... 9 CHECK PRE-CHARGE PRESSURE .............................................................. 9 PILOT ACCUMULATOR .................................................................................. 3 TESTING DEVICE .......................................................................................... 9 COMPONENTS ................................................................................................. 2 HYDRAULIC OIL HEATING PROCEDURE ....................................................... 11 PILOT CIRCUIT DESCRIPTION .......................................................................... 6 PILOT MANIFOLD ............................................................................................. 4 ASSEMBLY DIAGRAM .................................................................................. 5 OPERATING DESCRIPTION .......................................................................... 4 PILOT SHUT OFF ........................................................................................... 4 PILOT PRESSURE SETTINGS ........................................................................ 10 RELEASE PILOT SYSTEM PRESSURE ........................................................... 8

Tigercat M726D Mulcher PILOT SYSTEM COMPONENTS

Pilot System For filter replacement procedures, refer to REPLACE CHARGE VALVE FILTER in THIS SECTION. No further adjustments or pressure settings are required.

Oil flow for the pilot system is supplied by the fixed displacement boom/fan/steer pump. The accumulator charge valve diverts some of this oil to the pilot accumulator, brake accumulator and pilot manifold. The pilot manifold supplies oil at a reduced pressure, to two joysticks, a foot control valve and six solenoid operated control valves (within the manifold). A seventh solenoid valve is used as the pilot shut off to stop the flow of pilot oil to all pilot actuated functions.

••

PRESSURE PORT

STEERING PORT

••

For information on the BOOM/STEER PUMP and JOYSTICK CONTROL VALVES, refer to SECTION 11 in THIS MANUAL. For a detailed description of FOOT CONTROL VALVES, refer to SECTION 8 in THIS MANUAL. THIS SECTION details the location, and operation of the accumulator charge valve, accumulators and pilot manifold (including solenoid valves).

••

DRAIN PORT

ACCUMULATOR CHARGE VALVE

OPERATING DESCRIPTION

The accumulator charge valve controls the flow of oil to the steer valve, the pilot manifold and both the pilot and brake accumulators.

When the accumulator is charged above its lower limit (1200 psi), the charging valve spool is held against the spool stop by normal system back pressure. System pressure is directed to one end of the charging valve spool through a drilled passage. The lower limit check ball is held on its seat by accumulator pressure.

The accumulator charge valve has an internal sintered bronze filter, through which all oil passing to the pilot manifold and accumulators must flow.

This filter should be replaced every 1000 hours.

ACCUMULATOR PRESSURE

RETURN LINE PRESSURE

UPPER LIMIT CHECK BALL

UPPER LIMIT CHECK BALL

PILOT VALVE SPOOL TO ACCUMULATOR

FILTER LOCATION

ACCUMULATOR PORT M724D-23

ACCUMULATOR CHARGE VALVE

SYSTEM PRESSURE

••

•

PILOT VALVE SPOOL RETURN

TO ACCUMULATOR

LOWER LIMIT CHECK BALL

LOWER LIMIT CHECK BALL

PILOT VALVE SPRING

CHECK VALVE

RETURN

PILOT VALVE SPRING

CHECK VALVE ORIFICE

ORIFICE

CHARGING VALVE SPRING

SPOOL STOP

TO STEER VALVE

PRESS. PORT

CHARGING VALVE SPOOL

SPOOL STOP

CHARGING VALVE SPRING

TO STEER VALVE

ACCUMULATOR CHARGED

ACCUCHG

PRESS. PORT

CHARGING VALVE SPOOL

ACCUMULATOR BEING CHARGED

TYPICAL CHARGING VALVE SCHEMATICS 5.2

Tigercat M726D Mulcher When the pressure in the accumulator drops to its lower limit (1200 psi) charging is required.

Reduced accumulator pressure allows the pilot valve spring to unseat the lower limit check ball.

At the same time, the upper limit check ball is seated. The pilot valve spool permits only one limit check ball to be seated at any time.

Unseating the lower limit check ball allows pressure from the accumulator to enter the chamber behind the charging valve spool. A combination of accumulator hydraulic force and charging valve spring force balances the hydraulic force due to the pump pressure (system pressure) acting on the opposite end of the charging valve spool. Therefore pump pressure is higher than the accumulator pressure, which causes the accumulator to charge. The rate at which the accumulator is charged depends on the orifice in the check valve seat.

Pilot System pressure source for pilot manifold controlled functions. Second, it provides a stored pressure of 1800 psi for use as an emergency reserve for functions controlled through the pilot manifold.

Minimal movement of these functions is available after the engine stalls or is shut down.

BRAKE ACCUMULATOR The brake accumulator receives pressure from the accumulator charge valve. The brake accumulator ensures that the brake remains responsive at all times by maintaining an optimum pilot pressure of 1800 psi to the brake foot control valve. The brake accumulator holds sufficient pressure for up to 5 brake applications after the engine stalls or is shut down. Beyond this the pressure drops substantially. For further information about BRAKES refer to SECTION 9 of THIS MANUAL.

When the accumulator is charged to its high limit (1800 psi), accumulator pressure will unseat the upper limit check ball, and seat the lower limit check ball. Unseating the upper limit check ball releases the pressure in the chamber behind the charging valve spool, which flows to return and permits the charging valve spool to unload the pump.

VALVE GUARD

VALVE CAP GAS VALVE

BODY

When the operating pressure in the system (pump pressure) is greater than the pressure in the accumulator, the check valve at the accumulator charging orifice is forced off its seat; thus charging the accumulator to system pressure without the aid of the charging valve.

BLADDER

HYDRAULIC CONNECTION ACCU-1

POPPET (Seats against oil port after oil evacuation)

ACCUMULATOR (BLADDER TYPE)

ACCUMULATORS Both the pilot and brake accumulators are bladder type and are installed with a nitrogen precharge pressure. The gas pressures should be checked if the pilot system exhibits repeated and frequent charging cycles. Refer to CHECKING PRE-CHARGE PRESSURE in THIS SECTION.

WARNING Hydraulic circuits with accumulators store hydraulic oil under pressure and may remain pressurized after the engine is turned off.

WARNING

Prior to performing any maintenance or system modifications, exercise CAUTION to bleed off any stored system pressure by depressing the brake pedal at least 50 times and operating all controls several times. Refer to RELEASE PILOT SYSTEM PRESSURE in THIS SECTION for this procedure.

The accumulator must not be altered in any way. Do not weld or machine the pressure vessel. Use only NITROGEN for charging accumulators, never use oxygen or air due to risk of explosion.

PILOT ACCUMULATOR The pilot accumulator receives pressure from the accumulator charge valve. The pilot accumulator has two functions. First, it dampens system pressure fluctuations and provides a constant 5.3

Tigercat M726D Mulcher PILOT MANIFOLD

Pilot System

The pilot manifold is mounted under the edge of the outside rear wall of the cab and supplies pilot oil at a reduced pressure to the following circuits: • • • • • • • • •

Steer joystick Boom joystick Clamp(s) foot pedal Attachment Drive Door/Acc arm(s) close Door/Acc arm(s) open Front Axle differential lock Cooler Diverter Valve Rear Axle differential lock

(P2) (P2) (P2) (C2) Solenoid valve (C3) Solenoid valve (C4) Solenoid valve (C5) Solenoid valve (C6) Solenoid valve (C8) Solenoid valve

OPERATING DESCRIPTION The pilot manifold consists of a one piece manifold block into which, a pressure reducing valve, a pressure relief valve and a pilot shut off solenoid valve are installed. Seven solenoid operated control valves are installed at outlet ports C1, C2, C3, C4, C5, C6 and C8. Plugs are installed in ports C1 and C7. A “quick connect” test port fitting is installed in port P2 for attaching a pressure gauge during hydraulic set-up procedures.

Oil is supplied to the pilot manifold (port P1) from the steer pump via the accumulator charge valve and the pilot accumulator. The pilot accumulator provides a constant pressure source for the pilot controls. For a more detailed description of accumulators and their operation, refer to ACCUMULATORS in THIS SECTION. Oil entering the pilot manifold passes through the pilot pressure reducing valve. The pilot pressure reducing valve reduces and maintains the pilot pressure on the outlet side of the pilot manifold to a pre-set value.

PILOT PRESSURE RELIEF VALVE 675 PSI.

••

Pilot oil then passes through the pilot relief valve.

The relief valve is set higher than the pressure reducing valve and diverts pilot oil back to tank if the reducing valve fails to limit the pilot pressure.

To adjust the pressure reducing and the relief valves first loosen the jamnut, then to lower the pressure value screw OUT (counter-clockwise) the adjusting screw or, to raise the pressure value screw IN (clockwise) the adjusting screw. Tighten jamnut to lock this setting. For complete pressure setting instructions, refer to PILOT PRESSURE SETTINGS in THIS SECTION. The solenoid operated pilot shut off control valve blocks pilot oil to the solenoid valves (C1 - C8) when either of the cab doors are open. This will prevent the machine from being operated accidentally or in the case of an operator leaving the machine in an emergency. When the cab doors have been closed, and the pilot reset switch has been turned on, the pilot shut off solenoid is energized and pilot oil is allowed to flow to the outlet ports (P2) and solenoid operated pilot valves (C1 - C8). All functions controlled through the pilot manifold will respond to the operator’s movement. Refer to PILOT SYSTEM SHUT OFF in SECTION 2 of the OPERATOR’S MANUAL. The solenoid operated pilot valves control the position of the spool valves or pistons to which they are hydraulically connected. When a solenoid operated pilot valve is energized, usually by a switch in the cab, pilot oil is directed to shift the spool or piston in the function control valve.

When the solenoid is de-energized, a spring forces the spool back to the neutral position, blocking the pressure side and opening the pilot line back to tank. There are no adjustments on the solenoid valves.

PILOT SHUT OFF SOLENOID VALVE

INSTALL A 0 - 1000 PSI. GAUGE ON "P2" PORT

•

•• •• PILOT PRESSURE REDUCING VALVE 550 PSI.

M726D-062

PILOT MANIFOLD 5.4

Tigercat M726D Mulcher

Pilot System

• 726M-043

SOLENOID OPERATED CONTROL VALVE(S)

• • RELIEF VALVE

PLUGGED PORT

PRESSURE REDUCING VALVE

•

PILOT OIL TO BOOM JOYSTICK (END OF BLOCK)

PILOT SHUT OFF VALVE

•

PLUGGED PORT

•

•

•

•

•

GAUGE TEST PORT

• • • •

C8*

•

C5*

• ORIFICE

•

C4 *

•

ORIFICE C3*

• C2* C1*

IN FROM ACCUMULATOR CHARGE VALVE

AW119

*NOTE: REFER TO TEXT ON THE OPPOSITE PAGE TO IDENTIFY FUNCTION OF SOLENOIDS C1 TO C8 FOR YOUR MACHINE.

PILOT OIL TO STEER JOYSTICK AND CLAMP PEDAL (FRONT OF BLOCK)

PILOT MANIFOLD ASSEMBLY - M726D S/N 726M3001 TO 726M3010 5.5

Tigercat M726D Mulcher

Pilot System

PILOT CIRCUIT DESCRIPTION The boom/steer pump supplies oil to the pilot manifold (port ‘P1’) via the accumulator charge valve.

The accumulator charge valve controls the flow of oil to the pilot manifold, the steer valve, and to both the pilot and brake accumulators.

The pilot accumulator provides a constant pressure source for the pilot manifold controlled functions. The brake accumulator provides optimum pilot pressure to the brake foot control at all times. The pilot accumulator and brake accumulator are connected in series for charging.

A check valve is located between the two accumulators. This check valve prevents the pilot system from using brake accumulator pressure, but allows the brake accumulator to use pilot accumulator pressure.

Oil entering the pilot manifold passes through the pilot pressure reducing valve, pilot pressure relief valve and pilot shut off solenoid. The pilot shut off solenoid valve (in the pilot manifold) is energized when the cab doors are CLOSED and the pilot reset switch is ON. When the pilot shut off solenoid valve is energized, pilot oil can flow to the outlet ports (P2) and the solenoid operated pilot valves (C1 - C8) in the pilot manifold.

Pilot oil from the outlet ports (P2) supplies the steering joystick control valve, boom joystick control valve and clamp foot control valve.

These three valves are manually operated pilot valves.

When a solenoid operated pilot valve (C1-C8) is energized, by a switch in the cab, pilot oil is directed to shift the spool in the corresponding control valve and operate the required function.

In the case of front and rear differential lock, the pilot oil leaving the pilot manifold operates clutch packs in the axles to lock the differentials.

5.6

Tigercat M726D Mulcher

726M-045

Pilot System

PILOT CIRCUIT (WITH SAW) 5.7

Tigercat M726D Mulcher RELEASE PILOT SYSTEM PRESSURE

Pilot System REPLACE CHARGE VALVE FILTER NOTE: This sintered bronze filter should be replaced every 1000 hours. The filter is included in kit number 90045. Do not clean and reinstall an old filter.

WARNING Hydraulic circuits with accumulators store hydraulic oil under pressure and may remain pressurized after the engine is turned off.

The accumulator charge valve is accessed from the right side cooler package door.

Prior to beginning any service work on the pilot system or the braking system, pressure must first be released to prevent injury from oil spraying.

1. The machine should be parked on level ground with felling head lowered and oil cool.

Apply parking brake and shut off engine.

The following steps must be followed to release pressure: 1. Close both doors. Turn ignition switch to ON position. Do not start the engine. Press pilot reset switch.

Complete either steps 2A or 2B. 2A. Fully apply brake foot pedal 50 times or more.

2B. Turn rear differential switch ON and hold front differential lock switch ON for 30 seconds. While waiting, pump brake foot pedal at least 10 times.

NOTE: With both of the differential locks ON when the engine is OFF pilot oil stored in the accumulator is vented to tank. This drains the pilot system accumulator only.

Pumping the brake foot pedal vents both the pilot system accumulator and the brake accumulator to tank. This is necessary to relieve the pilot pressure trapped in the brake accumulator by the brake check valve.

3. Drain the air supply system at the drain valve and vent the hydraulic tank. Refer to SECTION 2 of the operator’s manual for VENTING HYDRAULIC RESERVOIR procedure.

2. Prior to beginning any service work on the pilot system or the braking system, pressure must first be released to prevent injury from oil spraying. Refer to RELEASE PILOT SYSTEM PRESSURE in THIS SECTION. 3. The charge valve is below the hydraulic oil cooler. Clean all debris from this area.

4. Carefully remove the hex socket plug on the top of the valve (oil may run out). Loosen the outer locknut first and then the screw assembly. Remove carefully as parts may fall out.

5. Once the screw is out, there are 7 parts that need to be removed. These parts may need to be removed with a magnet or hook tool. The last washer, below the filter, does not have to be removed.

6. Discard the old filter. Do not clean this filter, replace it with a new filter. Reassemble the parts paying close attention to orientation and order of the parts. It is recommended that all items included in kit be replaced at this time.

4. Pressure may remain in the system after completing all of the above steps. Use caution when loosening hydraulic connections.

7. Torque the screw assembly to 18 - 20 lbf-ft and then the outer locknut to 18 - 20 lbf-ft

STEERING PORT

PRESSURE PORT

DRAIN PORT

SPRING "O" RING

ACCUMULATOR PORT

PLUG WASHER

LOCKNUT

FILTER WASHER "O" RING SEAT AU001-3

ACCUMULATOR CHARGE VALVE 5.8

POPPET

Tigercat M726D Mulcher CHARGING THE ACCUMULATORS NOTE: A detailed instruction sheet is provided with the charging and testing device. The following is only a suggested guide.

•

Close the drain valve on the charging and testing device and connect the hose to the nitrogen bottle.

•

Remove the valve guard and cap.

•

Screw the charging and testing device onto the gas valve.

HOSE*

PRESSURE GAUGE*

ADAPTER* ADAPTER* NITROGEN BOTTLE

ACCUMULATOR

Pilot System CHECKING THE PRE-CHARGE PRESSURE After the accumulator has been put in service, the pre-charge pressure should be checked with an accumulator charging and testing device.

Prior to beginning any service work on the pilot system or the braking system, pressure must first be released to prevent injury from oil spraying.

Refer to RELEASE PILOT SYSTEM PRESSURE in THIS SECTION. Install the charging and testing device on the gas valve. While depressing the button on the charging device, observe gas pressure reading on gauge. Refer to CHARGING THE ACCUMULATORS in THIS section for correct pressures.

If the gas pre-charge pressure is low, investigate the cause and correct it. Possible causes of lost pre-charge pressure include a leaking or damaged gas valve, or a damaged bladder.

ASSEMBLY PART NO. 90254 INCLUDES PARTS SHOWN * ACCU-

CHARGING AND TESTING DEVICE

•

Open the gas shut-off valve on the nitrogen bottle and allow gas to flow slowly into the accumulator.

•

Close the shut-off valve frequently and check the value of the pre-charge by depressing the button on the charging device and observing the gauge.

•

If pre-charge pressure is high, lower it by opening the drain valve and carefully depressing the button on the charging device.

Pilot Accumulator pre-charge - 700 psi Brake Accumulator pre-charge - 750 psi NOTE: The pre-charge pressure will vary depending on the temperature. Once the desired pre-charge is reached, wait two minutes for the gas temperature to equalize.

Re-check pre-charge and adjust if necessary.

•

Disconnect hose from nitrogen bottle.

•

Remove charging and testing device from accumulator and install valve cap and guard, torque to 175-350 lbf/ins.

•

Check to ensure there are no leaks, if the gas valve is leaking, it should be replaced. Use only valves approved for accumulator service.

NEVER USE AN AUTOMOTIVE TYPE VALVE.

5.9

Tigercat M726D Mulcher PILOT PRESSURE SETTINGS The following procedure deals with setting up the PILOT circuit, i.e., the pilot manifold relief valve and the pressure reducing valve.

WARNING To prevent injury caused by accidental steering of the machine when setting pressures, make sure the articulation lock bar is held securely in place by the lynch pins provided.

1. Park machine on level ground, lower attachment to the ground and set parking brake ON. Install articulation lock bar, block wheels and stop engine.

WARNING Hydraulic circuits with accumulators store hydraulic oil under pressure and may remain pressurized after the engine is turned off.

Pilot System 3. Connect a 0-1500 psi pressure gauge to the test port at ‘P2’ of the pilot manifold. The pilot manifold is located under the back edge of the cab, in front of the “A” frame which supports the front edge of the roof enclosure.

4. Ensure that the hydraulic oil temperature is between 120°F and 140°F. 5. Turn the pressure reducing valve adjusting screw (far left, top of manifold) all the way IN (clockwise).

6. Turn the relief valve adjusting screw (second from left) OUT (counter-clockwise) until the spring tension is completely relieved, then turn adjusting screw IN (clockwise) one full turn .

7. Start the engine and set the throttle control to IDLE. 8. Adjust the relief valve pressure to 675 psi.

9. Adjust the pressure reducing valve pressure to 550 psi.

10. Leave parking brake ON, shut off the engine.

Remove all pressure gauges and wipe up any excess oil from test port area.

2. Prior to beginning any service work on the pilot system or the braking system, pressure must first be released to prevent injury from oil spraying.

RELIEF VALVE

•

The following steps must be followed to release pressure:

PRESSURE REDUCING VALVE

••

a) close both doors, turn ignition switch to ON position, do not start the engine, press pilot reset switch. b) activate all controls (switches, joysticks, left foot pedal etc.) and pump brake foot pedal at least 50 times or more. c) drain the air supply system at the drain valve and vent the hydraulic tank. Refer to SECTION 2 of the Operator’s Manual for VENTING HYDRAULIC RESERVOIR procedure. d) pressure may remain in the system after these numerous applications, use caution when loosening hydraulic connections.

AW119

5.10

PILOT MANIFOLD

Tigercat M726D Mulcher HYDRAULIC OIL HEATING PROCEDURE

Pilot System 5. Adjust throttle to FULL.

Heat the hydraulic oil in the machine in preparation for hydraulic set-up procedures as follows: 1. Park the machine on level ground, parking brake ON, felling head down and engine off.

Install articulation lock bar, block wheels and stop engine.

2. Connect a 0-5000 psi gauges to the inlet test port on the boom valve.

•• TEST PORT

MAIN RELIEF

6. Operate clamp closed for 30 seconds, then stop for 5 seconds.

WARNING DO NOT leave the machine while heating the oil, as overheating of engine or oil can cause serious damage.

7. Repeat step 6 while monitoring hydraulic oil temperature until the temperature is between 120°F and 140°F. This process will take 20 to 30 minutes depending on ambient air temperature.

8. Ensure that hydraulic oil is between 120°F and 140°F (operating temperature), then proceed to required hydraulic set-up procedure.

WARNING

•• 726M-069

BOOM VALVE

3. Start the engine and adjust throttle to IDLE. Place a sheet of cardboard in front of the oil cooler side of the heat exchanger. The radiator must remain uncovered to prevent engine overheating.

4. Adjust the boom valve inlet main relief to 2000 psi using the clamp close function.

The temperature rises quickly when setting relief valves. Remove the cardboard blocking the oil cooler if necessary to maintain the proper temperature. Do not pass oil over relief valves for longer than 5 seconds at a time during set-up procedures. Damage to valves can occur from excessive heat.

9. Return boom valve inlet main relief to normal pressure settings using clamp closed function, refer to PRESSURE SETTINGS in SECTION 18 (SAW).

5.11

Tigercat M726D Mulcher

726M-046

Pilot System

HYDRAULIC CONNECTIONS - REAR CHASSIS

5.12

Tigercat M726D Mulcher SECTION 6 - ELECTRICAL, GAUGES & ALARMS MARCH, 2006

CONTENTS - SECTION 6 BATTERY COMPARTMENT ......................................................................... 6.11 ELECTRICAL COMPONENT LOCATIONS .......................................... 6.14, 6.15 ELECTRICAL SCHEMATIC SHEET 1 OF 3 .................................................................................... 6.2, 6.5 SHEET 2 OF 3 .................................................................................... 6.3, 6.6 SHEET 3 OF 3 .................................................................................... 6.4, 6.7 FAN AUTO REVERSE CYCLE ..................................................................... 6.17 FUSE AND RELAY PANEL CAB ................................................................................................ 6.16, 6.17 MAIN ................................................................................................... 6.8, 6.9 RELAYS AND WIRE CONNECTIONS ................................................ 6.12, 6.13 WIRE CONNECTIONS - RELAYS ...................................................... 6.12, 6.13

Tigercat M726D Mulcher

Electrical, Gauges and Alarms

ELECTRICAL SCHEMATIC - SHEET 1 OF 3 ~ SERIAL NUMBER 726M3001 TO 726M3020

26226BS1.DWG 726M-015

6.2

Tigercat M726D Mulcher

Electrical, Gauges and Alarms

ELECTRICAL SCHEMATIC - SHEET 2 OF 3 ~ SERIAL NUMBER 726M3001 TO 726M3020

26226BS2.DWG 726M-016

6.3

Tigercat M726D Mulcher

Electrical, Gauges and Alarms

ELECTRICAL SCHEMATIC - SHEET 3 OF 3 ~ SERIAL NUMBER 726M3001 TO 726M3020

26226BS3.DWG 726M-017

6.4

Tigercat M726D Mulcher

Electrical, Gauges and Alarms

ELECTRICAL SCHEMATIC - SHEET 1 OF 3 ~ SERIAL NUMBER 726M3021 AND UP

27288BS1.DWG 726M-032

6.5

Tigercat M726D Mulcher

Electrical, Gauges and Alarms

ELECTRICAL SCHEMATIC - SHEET 2 OF 3 ~ SERIAL NUMBER 726M3021 AND UP

27288BS2.DWG 726M-031

6.6

Tigercat M726D Mulcher

Electrical, Gauges and Alarms

ELECTRICAL SCHEMATIC - SHEET 3 OF 3 ~ SERIAL NUMBER 726M3021 AND UP

27288BS3.DWG 726M-025

6.7

Tigercat M726D Mulcher

Electrical, Gauges and Alarms

MAIN FUSE AND RELAY PANEL - ENGINE COMPARTMENT ~ SN 726M3001 TO 726M3020 This main fuse and relay panel is located in the electrical box on the left side of the engine compartment.

6.8

Tigercat M726D Mulcher

Electrical, Gauges and Alarms

MAIN FUSE AND RELAY PANEL - ENGINE COMPARTMENT ~ SN 726M3021 AND UP This main fuse and relay panel is located in the electrical box on the left side of the engine compartment.

6.9

Tigercat M726D Mulcher

Electrical, Gauges and Alarms

ELECTRONIC CONTROLLER

•

•• DIAGNOSTIC CONNECTOR

726D-026

ELECTRONIC FAN CONTROLLER WIRING AND DIAGNOSTIC CONNECTOR SN 726M3001 TO 726M3020

726M-008

A/C HEATER RELAYS Three relays used to controll the A/C and Heater functions are located on the side of the A/C Heater unit just inside the right cab door.

MODE SELECTOR SWITCH

••

ELECTRONIC CONTROLLER

• DIAGNOSTIC CONNECTOR

••

726M-023

A/C HEATER RELAYS

ELECTRONIC FAN CONTROLLER WIRING AND DIAGNOSTIC CONNECTOR SN 726M3021 AND UP

FAN CONTROLLER The electronic controller for the hydraulic driven engine cooling fan is located on the lower front panel of the cab just inside the right cab door.

6.10

Tigercat M726D Mulcher

Electrical, Gauges and Alarms

724M-064.DWG 726M-004.DWG

BATTERY COMPARTMENT AND ENGINE ELECTRICAL BOX - SERIAL NUMBER 726M3001 TO 726M3020

724M-064.DWG

726M-019.DWG

BATTERY COMPARTMENT AND ENGINE ELECTRICAL BOX - SERIAL NUMBER 726M3021 AND UP 6.11

Tigercat M726D Mulcher Electrical, Gauges and Alarms RELAYS AND WIRE CONNECTIONS - SERIAL NUMBER 726M3001 TO 726M3020

6.12

Tigercat M726D Mulcher Electrical, Gauges and Alarms RELAYS AND WIRE CONNECTIONS - SERIAL NUMBER 726M3021 AND UP

6.13

Tigercat M726D Mulcher Electrical, Gauges and Alarms ELECTRICAL COMPONENT LOCATIONS - SERIAL NUMBER 726M3001 TO 726M3020

INSTRUMENT PANEL

••

•• 726M003.DWG

ELECTRONIC FAN CONTROL MODULE

ELECTRICAL BOX

BATTERY COMPARTMENT

•• •

726M-001.DWG

6.14

Tigercat M726D Mulcher Electrical, Gauges and Alarms ELECTRICAL COMPONENT LOCATIONS - SERIAL NUMBER 726M3021 AND UP

INSTRUMENT PANEL

••

•• 726M003.DWG

ELECTRONIC FAN CONTROL MODULE

ELECTRICAL BOX

•

BATTERY COMPARTMENT

•

726M-020.DWG

6.15

Tigercat M726D Mulcher

Electrical, Gauges and Alarms 5

• 1

2

3

4

••

••

•

•

10

11

• 7

•• •

8

•

••

6

•

9

•

12

14

••

15

••

••

13 16

•

1.

2.

3.

4.

5.

6.

7.

8.

FIRE EXTINGUISHER LEFT FOOT PEDALS BRAKE PEDAL RIGHT FOOT PEDALS FUSE AND RELAY PANEL LEFT DOOR SAFETY SWITCH LEFT JOYSTICK SEAT

726-018

9.

10.

11.

12 13.

14.

15.

16.

RIGHT JOYSTICK LIGHT SWITCHES (OPTIONAL) RIGHT DOOR SAFETY SWITCH INSTRUMENT PANEL HEATER/AC CONTROLS PARKING BRAKE LEVER PARKING BRAKE WARNING SWITCH PILOT MANIFOLD (UNDER CAB)

M726D MULCHER CAB COMPONENTS AND CONTROLS 6.16

Tigercat M726D Mulcher FUSES AND RELAYS

Electrical, Gauges and Alarms

FAN AUTO REVERSE ADJUSTMENT

+

FUSE AND RELAY PANEL - CAB Each major circuit on the vehicle is protected against current overload by fuses. The fuses and relays are located in two places on the machine.

The Cab fuse and relay panel is located in the compartment just below the main control panel as shown above. The main fuse and relay panel is located in the electrical box in the engine compartment as shown on the next page.

FAN AUTO REVERSE CYCLE The fan auto reverse cycle is set by adjusting the potentiometer "A" located in the fuse and relay panel shown above. This adjustment can be set to auto reverse every 10 to 60 minutes in one minute increments.

••

-

Turn the potentiometer clockwise to decrease time between fan auto reversals or counter clockwise to increase time between auto reversals.

RECALIBRATING THE POTENTIOMETER If blink code 45 is displayed by the red LED on the fan controller, the auto reverse potentiometer requires recalibration. To recalibrate the potentiometer, turn adjustment “A” fully counterclockwise, wait 5 seconds, then turn the adjustment “A” fully clockwise and wait 5 seconds.

Turn the adjustment “A” counterclockwise 1/4 to 3/8 of a turn to set the auto reversal interval to approximately 20 minutes.”

6.17

Tigercat M726D Mulcher

Electrical, Gauges and Alarms

6.18

Tigercat M726D Mulcher SECTION 7 - ENGINE MARCH, 2006

CONTENTS - SECTION 7 CHARGE AIR COOLER .................................................................................. 7.9 CIRCUIT DESCRIPTION CUMMINS ENGINE ..................................................................................... 7.2 COOLING SYSTEM CHARGE AIR COOLER ............................................................................... 7.9 COOLANT FLOW DIAGRAM ....................................................................... 7.8 COOLANT FLOW DURING OPERATION ..................................................... 7.8 FILLING THE SYSTEM WITH COOLANT ..................................................... 7.8 CUMMINS QSC ENGINE WIRING DIAGRAM ......................................... 7.6, 7.7 PARKING BRAKE .......................................................................................... 7.2 PRECLEANER OPERATION ............................................................................................. 7.10 SERVICE .................................................................................................. 7.10 RELAYS, DIODES AND FUSES PANEL ........................................................ 7.3 START CIRCUIT DIAGRAMS - CUMMINS 'C' ENGINE AT REST ..................................................................................................... 7.4 RUN AND DRIVE ......................................................................................... 7.5 RUN, NO DRIVE .......................................................................................... 7.5 START ......................................................................................................... 7.4 STARTING SYSTEM DESCRIPTION .............................................................. 7.2

Tigercat M726D Mulcher

Engine

STARTING CIRCUIT

CIRCUIT DESCRIPTION - CUMMINS ENGINE

For detailed engine information, refer to the engine manufacturer's manual.

With the parking brake ON, the parking brake proximity switch is closed and the drive enable relay (4) is energized through wires 6 and 11.

For engine starting and stopping procedures refer to STARTING ENGINE and STOPPING ENGINE in SECTION 2 of the OPERATOR’S MANUAL.

KEY SWITCH

•

The engine starting circuit is controlled by a proximity switch located on the parking brake lever which prevents the engine from being started when the parking brake is OFF.

•

KEY SWITCH

726M-020

When the key is turned to the START position, voltage is supplied to the start circuit through wire 6 to the contacts of drive enable relay (4) and wire 9 to the start relay (3).

PROXIMITY SWITCH

REMOTE START SOLENOID

337-19

••

PARKING BRAKE "OFF" POSITION

125 AMP FUSE

•

726D-023

337-20

Voltage is supplied through wire 23 to the coil of the start relay (3), which closes and supplies voltage through wire 16 to the coils of the remote start solenoid and the fuel solenoid. The start solenoid relay closes and supplies voltage through wire 12 to close the contacts of the start solenoid and supply battery power to the starter to turn the engine.

PARKING BRAKE "ON" POSITION

The parking brake must be in the ON position to allow the engine to start. The engine is started by turning the key to the ON position wait for WAIT TO START light to go OUT then turn key to START position and then releasing it to the RUN position after the engine starts.

If the engine stalls during operation of the vehicle, the key must be turned to the OFF position to reset the ignition switch before the engine can be restarted.

Refer to START CIRCUIT DIAGRAMS in THIS SECTION. 7.2

Tigercat M726D Mulcher

Engine

726D-004

RELAYS, DIODES AND FUSES PANEL When the parking brake is OFF, the drive enable relay (4) is de-energized, voltage is not available in wire 9 and therefore the engine cannot be started. This prevents accidental starting of the engine when the parking brake is OFF. It should be noted that with the engine running, the parking brake ON and the drive enable relay energized, voltage is not available in wire 66 to the drive lock relay (2). Because of this, driving the machine is still not possible until both cab doors are closed and the pilot reset switch is pressed.

197-5

CAB DOOR SWITCH

To set machine in drive mode, place parking brake OFF to de-energize the drive enable relay (4) and allow voltage to flow to drive lock relay (2) along wire 66. Close both doors and press the pilot reset switch. This will energize the pilot shut off relay (1), de-energize the drive lock relay (2) and allow voltage to flow through wire 36 to energize the drive prevent valve solenoid and allow pilot oil to the drive pedals.

For schematic diagrams, showing various stages of the start circuit, refer to START CIRCUIT DIAGRAMS - CUMMINS 'C' ENGINE OPTION in THIS SECTION. 7.3

Tigercat M726D Mulcher

Engine

START CIRCUIT DIAGRAMS - CUMMINS 'C' OR 'L' ENGINE START CIRCUIT - AT REST

726M-038

START CIRCUIT - START MASTER DISCONNECT - ON PARKING BRAKE - ON

IGNITION KEY - START POSITION

726M-039

7.4

Tigercat M726D Mulcher

Engine

START CIRCUIT DIAGRAMS - CUMMINS 'C' OR 'L' ENGINE START CIRCUIT - RUN, NO DRIVE MASTER DISCONNECT - ON PARKING BRAKE - OFF

PILOT RESET SW. - OFF IGNITION KEY - RUN (IGNITION)

726M-040

START CIRCUIT - RUN AND DRIVE MASTER DISCONNECT - ON PARKING BRAKE - OFF

PILOT RESET SW. - ON IGNITION KEY - RUN (IGNITION)

726M-041

7.5

Tigercat M726D Mulcher

Engine B A

B12

C B A

B29 B30 B19

B C A

B26 B25

A C

B24 B38 B43 B47 B21

B D

B

B17 B23 B28 B07 B13

U N E F

L

G

K

B14

H B34

H

E J

B37

A D

B35 B36

B C P A K D

C

B01 B03 B04 B11 B02

D

N

B33

N

B27 B39

E

B48

C

B49 B50

L M

O

C A

A B

T O

A B

B08 B18 B44

R

D A B

B05 B16 B45 B46

C

C

C

B

B

A

A

A

A

B

B

A B C D

A B C D

B10 B09 B20

KEYSWITCH (PAGE 2)

CUMMINS ENGINE WIRING DIAGRAM 7.6

B40 B41 B31

Tigercat M726D Mulcher

Engine KEYSWITCH (PAGE 1)

5.0A

A 7.5A

B

5 39

7.5A

C

40

7.5A

D

10 AMP

M

50 38

S 10 AMP

E F

20 28

H

29

P

30

W

19

N

41

O

42

Q

04

R

19

J

01

K

47

L

48

2

X

26

1

V

24

T

19

U

16

G

13

1 2

A B C

A B C

A B C

A B C C D E A B

CUMMINS ENGINE WIRING DIAGRAM 7.7

2 12 44

Tigercat M726D Mulcher ENGINE COOLING SYSTEM

Engine Additional coolant stored in the surge tank flows slowly down the shunt hose to the water pump inlet replacing the air removed from the cooling system.

COOLANT FLOW DURING OPERATION The water pump circulates coolant through the radiator, engine oil cooler, the engine block and cylinder head. If the thermostat is closed, coolant is returned to the water pump through a bypass inside the engine.

FILLING THE SYSTEM WITH COOLANT The coolant is added through the filler neck in the surge tank. This coolant fills the bottom radiator hose at the water pump through the shunt hose and then fills the radiator from the bottom upwards. Air is displaced through the vent tube to the surge tank. As the radiator is filled, coolant flows through the water pump and engine oil cooler to fill the engine. Coolant will flow out the top radiator hose through the thermostat bypass and into the engine once the radiator has filled.

The engine vent discharges air directly from the engine to the surge tank.

The thermostat opens when the coolant reaches operating temperature. Then the coolant flows across the radiator core to the outlet and back to the water pump through the bottom radiator hose.

A surge tank is located above the engine. A small vent tube is connected between the surge tank and the thermostat housing. The anti-freeze/water solution used in the cooling system always contains small amounts of gas produced by combustion leakage. This gas must be vented to the outside to prevent cavitation of the engine water pump and to promote efficient heat transfer between the engine block and the coolant. These gases separate from the coolant in the radiator top tank and are carried up through the vent tube where they collect in the surge tank and eventually discharge through the pressure cap.

When the engine has been run up to operating temperature and the thermostat has opened, any remaining air is purged through the vent tube.

The system will then require more coolant to fully top off both the engine and the radiator.

The engine vent discharges air directly from the top of the engine to the surge tank.

FLOW OF COOLANT WITH ENGINE RUNNING AT OPERATING TEMPERATURE AND THERMOSTAT OPEN

SURGE TANK RADIATOR

•

VENT TUBE THERMOSTST HOUSING WATER PUMP

CHARGE AIR COOLER

RAD CAP

SHUNT HOSE

•

•• ••

•• ••

•• • •• • • • ENGINE OIL COOLER 726M-037A

DRAIN TAP

ENGINE COOLING SYSTEM 7.8

TOP RADIATOR HOSE

•

BOTTOM RADIATOR HOSE HYDRAULIC OIL COOLER

Tigercat M726D Mulcher CHARGE AIR COOLER (CAC)

Engine MAINTAINING THE CHARGE AIR COOLER

The charge air cooler is an air to air heat exchanger which cools turbocharged engine intake air. This cooling makes the intake air more dense for improved combustion, reduced emissions and increased efficiency of the engine.

Other advantages of a charge air cooler include increased fuel economy and reduced wear of engine components due to lower intake manifold temperatures. The charge air cooler is located above the oil cooler and radiator sections of the heat exchanger. Refer also to ENGINE MANUFACTURER'S MANUAL.

Inspect charge air cooler for dirt and debris blocking fins. Inspect the charge air piping and hoses for leaks holes, cracks or loose connections. Tighten hose clamps as required.

Refer to SCHEDULED MAINTENANCE in SECTION 3 of THIS MANUAL and CLEANING THE A/C CONDENSER AND COOLING ASSEMBLY in SECTION 2 of the OPERATOR'S MANUAL. NOTE: If the engine experiences a turbocharger failure or other event where oil or debris enters the charge air cooler the charge air cooler must be cleaned. If debris cannot be removed the charge air cooler must be replaced. Refer to ENGINE MANUFACTURER'S MAINTENANCE MANUAL.

AIR FLOW DURING OPERATION Intake air from the engine air cleaner enters the turbocharger where the air is pressurized. The pressurized air flows from the turbocharger to the charge air cooler where it is cooled by ambient air flow. The cooler pressurized air flows from the charge air cooler to the intake manifold of the engine.

Refer also to COOLING SYSTEM AND CROSSFLOW FAN in SECTION 10 of THIS MANUAL.

CHARGE AIR COOLER (CAC)

CROSS-FLOW COOLING FAN

•• • INTAKE MANIFOLD

• •• TURBOCHARGER

726M-047

CHARGE AIR COOLER: AIR FLOW DURING OPERATION 7.9

Tigercat M726D Mulcher PRECLEANER - ENGINE AIR INTAKE

Engine

The precleaner is the first defense against foreign objects entering the air intake to the air cleaner filter elements and the engine. This unit draws its air supply through the perforated side engine door where the course outer screen blocks the passage of large particles such as leaves, twigs or pine needles. Inside the precleaner is a turbine fan which spins due to the passage of air over its blades. The blades direct large particles to the outside of the casing, where they are blown out the exhaust port area. The main air stream continues into the air filter assembly for removal of fine dust and particles.

AS THE AIR SPINS, CENTRIFUGAL FORCE SEPARATES FOREIGN MATERIALS FROM THE CLEAN AIR

CONTAMINANTS ARE BLOWN OUT OF SPECIAL DISCHARGE PORTS BY HIGH VELOCITY, AIR POWERED ROTOR

• • • •

THE PRECLEANER HAS SPECIALLY DESIGNED BLADES THAT CAUSE THE INCOMING AIR TO SPIN TURBO 2

ONLY THE PURIFIED AIR GOES TO THE AIR FILTER

PRECLEANER OPERATION

SERVICE Under normal conditions, the outer screen should be checked every 8 hours for obstructions such as leaves, needles and twigs. This is done by opening the left, rear, upper engine door.

The complete precleaner unit must be removed for inspection and cleaning whenever the air cleaner primary filter element is replaced. This is done by loosening the gear clamp behind the unit and pulling it loose. Check the blades for dirt build-up and clean them. Check the exhaust port area (narrow slots around outside of casing) for dirt and particle build-up. Clean the entire unit.

When installing the unit, ensure that the intake end with the screen is protruding into the hole in the engine door by about 1/4" when the door is closed. Tighten the gear clamp and check to see that the engine door closes properly.

7.10

Tigercat M726D Mulcher SECTION 8 - DRIVE MARCH, 2006

CONTENTS - SECTION 8 AXLES .......................................................................................................................... 8.23 AXLE LUBRICATION ................................................................................................. 8.25 BRAKE BLEEDING ................................................................................................... 8.25 BRAKE LINING INSPECTION (REAR AXLE ONLY) ................................................... 8.24 DIFFERENTIAL AND DIFFERENTIAL LOCKS ........................................................... 8.24 DRAINING THE AXLES ............................................................................................. 8.25 FILLING AXLES, ALTERNATIVE METHOD ................................................................ 8.26 FILLING THE AXLES ................................................................................................. 8.25 REAR AXLE OSCILLATION SHIM ............................................................................. 8.27 SERVICE BRAKES (REAR AXLE ONLY) .................................................................. 8.24 CIRCUIT DESCRIPTION SINGLE MOTOR 2-SPEED TRANSMISSION .............................................................. 8.2 CIRCUIT DIAGRAM, DRIVE SINGLE MOTOR 2-SPEED TRANSMISSION ............................................................ 8.13 DRIVE MOTOR SINGLE MOTOR 2-SPEED TRANSMISSION .............................................................. 8.8 DRIVE PEDAL PILOT VALVE ....................................................................................... 8.10 DRIVE PREVENT VALVE ............................................................................................ 8.11 DRIVE PUMP ................................................................................................................. 8.2 DRIVE PUMP AND MOTOR PRESSURE SETTINGS AND ADJUST DUAL MOTOR 1-SPEED TRANSMISSION ................................................................ 8.16 DRIVE SHAFT, FRONT, INSTALLATION ...................................................................... 8.21 HYDRAULIC OIL HEAT-UP ................................................................................. 8.15, 8.16 HYDROSTATIC DRIVE SYSTEM SINGLE MOTOR 2-SPEED TRANSMISSION .............................................................. 8.2 SPEED CONTROL LEVER VALVE .............................................................................. 8.12 TEST DRIVE SINGLE MOTOR 2-SPEED TRANSMISSION ............................................................ 8.14 TRANSMISSION 2-SPEED (SINGLE MOTOR) ............................................................. 8.19 SHIFT LEVER ........................................................................................................... 8.20 WHEEL INSTALLATION ............................................................................................... 8.29

Tigercat M726D Mulcher

Drive LOW PRESSURE RETURN

BENT AXIS PISTON DRIVE MOTOR B

B

TO VEHICLE DRIVE

FROM DIESEL ENGINE

A

A SWASHPLATE, AXIAL PISTON DRIVE PUMP HIGH PRESSURE SUPPLY

726M-052

TYPICAL CONTINUOUS CLOSED LOOP HYDRAULIC CIRCUIT SINGLE MOTOR (2-SPEED TRANSMISSION)

HYDROSTATIC DRIVE SYSTEM

REXROTH DRIVE PUMP

SINGLE MOTOR 2-SPEED TRANSMISSION

PUMP DRIVE GEARBOX

The primary components of the single motor two speed transmission hydrostatic drive system are a hydraulic pump and a hydraulic motor connected together by two hydrostatic hoses. The pump converts the mechanical power of the diesel engine into hydraulic power. This high pressure flow of hydraulic oil is then transmitted to the hydraulic motor through a connecting hose. The motor then reconverts the hydraulic power back into the mechanical power used to propel the machine. Low pressure hydraulic oil flow then returns from the motor to the pump through the other connecting hose thereby completing a continuous closed loop hydraulic circuit.

••

ATTACHMENT PUMP

•• BOOM/FAN/ STEER PUMP

•

DRIVE PUMP

A hydraulic system is termed closed loop when the hydraulic oil returning from the motor is fed straight back to the pump without first returning to tank. When the machine is travelling forward, one side of the closed loop is a high pressure supply while the other side is a low pressure return. The supply and return will alternate from side to side of the closed loop as the direction of travel of the vehicle goes from forward to reverse.

726M-061

• DRIVE PUMP LOCATION

The hydrostatic drive pump is mounted at the bottom right position of the pump drive gearbox.

The input drive shaft of the pump is connected directly to the output of the gearbox. The gearbox is driven directly by the diesel engine through a steel flex plate.

Hydrostatic drives are used because they offer enhanced operator control of vehicle speed and tractive effort. As well hydrostatic drive systems give flexibility in the positioning of components within the machine when compared to mechanical drive systems.

The hydrostatic drive pump is actually two separate hydraulic pumps mounted in a common case and driven by the same input drive shaft.

8.2

Tigercat M726D Mulcher

Drive

DRIVE PUMP SCHEMATIC

726M-056

DRIVE PUMP PRIMARY SECTION

The primary pump is a variable displacement, swashplate, in line axial piston type pump. The volume and direction of oil flow from the piston pump is determined by the angle of the tiltable swashplate. When the swashplate is stroked to a maximum displacement angle, the piston pump will produce maximum flow in one direction in the closed loop. As the swashplate is de-stroked, the flow smoothly decreases until there is no flow at an angle of zero (0°). Continuing to angle the swashplate past this neutral position steplessly reverses the direction of flow from the piston pump.

CHARGE PUMP

SWASH PLATE

• •• • ••

The secondary pump is a fixed displacement, internal gear type which provides charge oil (make-up oil) for the hydrostatic pump and motors in the closed loop system. The charge pump also provides pilot oil to the drive pedals and speed control.

ROTARY GROUP AP096A

DRIVE PUMP CROSS SECTION

8.3

Tigercat M726D Mulcher DRIVE SHAFT

CONTROL CYLINDER

Drive

SWASHPLATE CONTROL VALVE

CHARGE PUMP

'B' PORT RELIEF

PORT 'B'

PORT 'B' CHARGE PUMP RELIEF

A

AP024-F AP024-G

'A' PORT RELIEF SWASHPLATE

SPLINED SHAFT

PORT 'A'

VIEW A

PORT 'A'

PRESSURE OVERRIDE VALVE (P.O.R.)

DRIVE PUMP SECTION(REXROTH) The drive footpedal control valve directs oil from the charge pump and sends a pressure signal to shift the spool in the swashplate control valve.

This changes the position of the control cylinder which is directly connected to the swashplate of the piston pump. The angle and direction that the swashplate moves determines the speed and direction of travel of the vehicle. The angle and direction that the swashplate moves is directly proportional to the position of the drive footpedal and may be limited by the use of the speed control valve.

oil can be directed to either the forward or reverse side of the pump swashplate control valve as required. With the drive prevent valve deenergized, drive footpedal oil is directed to tank the drive pump displacement control valve does not move and the pump swashplate angle remains at zero (0o).

The hydrostatic piston pump is equipped with a pressure override (P.O.R.) valve to protect the closed loop hydrostatic drive components from excessive pressure. When the tractive effort requirements of the vehicle are demanding then pressure on the high side of the closed loop can reach maximum. At this pressure the P.O.R. valve signals the swashplate control valve to destroke the swashplate, reducing piston pump flow and maintaining system pressure at the P.O.R. setting.

The P.O.R. prevents continuous dumping of high pressure oil across the piston pump high pressure relief valves. This eliminates unnecessary heating of the oil and protects the pump and motors during rapid acceleration and deceleration or when the drive system stalls.

When neither of the drive footpedals are depressed, pilot oil is not supplied to the swashplate. The swashplate therefore remains in the neutral position and no oil is pumped by the piston pump.

The speed control valve limits the maximum speed of the vehicle by reducing the flow of pilot oil to the drive pedal, allowing the operator to maintain a given speed without the need to feather the footpedals. Note that some early machines are not equipped with the speed control valve.

The two high pressure relief valves at ‘A’ and ‘B’ ports are intended only to act as pressure limiting safety devices in the event that the P.O.R. valve malfunctions or does not respond quickly enough to high pressure surges. For this reason the high pressure relief valves are always adjusted higher than the P.O.R. valve setting. The high pressure relief valves always dump oil from the high pressure to the low pressure side of the closed loop thereby keeping the hydraulic oil within the closed loop.

The drive footpedal control valve only functions when the parking brake lever is in the OFF position. This prevents driving the machine when the parking brake is applied. A proximity switch is attached to the parking brake lever. When this lever is in the OFF position, the proximity switch contacts are open, de-energizing the drive enable relay and energizing the drive prevent valve. With the drive prevent valve energized, drive footpedal 8.4

Tigercat M726D Mulcher

Drive

726M-055

DRIVE HYDRAULIC SCHEMATIC Excess charge pump oil is relieved by the charge pump relief valve back into the case of the piston pump. The charge pump pressure filter ensures that only clean charge pump oil is introduced into the closed loop hydrostatic circuit and the swashplate control system. Should this pressure filter become clogged with debris, charge pump flow is diverted to tank thus preventing the entry of unfiltered charge pump oil.

The charge pump continuously introduces oil from the hydraulic tank back into the hydrostatic drive system. The charge pump relief valve maintains a constant pilot pressure for use by the swashplate control system. In addition, the charge pump oil is used as make up oil to the low pressure side of the closed loop to replenish losses due to internal leakage in the hydrostatic pump and motor. This same flow acts as a cooling fluid for the piston pump and motors to ensure peak hydrostatic drive performance and long service life.

8.5

Tigercat M726D Mulcher

726M-054

Drive

DRIVE PUMP AND MOTOR HYDRAULIC CONNECTIONS SINGLE MOTOR (2-SPEED TRANSMISSION)

8.6

Tigercat M726D Mulcher

726M-055

Drive

DRIVE HYDRAULIC SCHEMATIC 8.7

Tigercat M726D Mulcher

Drive

HYDROSTATIC DRIVE MOTOR SINGLE MOTOR 2-SPEED TRANSMISSION One motor is used to drive this machine. It is mounted to the input side of the transmission. A splined coupling connects the motor shaft to the transmission input shaft.

The motor is an axial piston, variable displacement, pressure compensated type. It forms a closed loop circuit with the pump.

High pressure oil from the drive pump enters the motor via port 'A' or port 'B', depending on the direction of travel. The oil is directed to the back of a set of pistons in the motor's rotary group. The pistons push against the back of the drive shaft at an angle causing it to rotate.

SINGLE DRIVE MOTOR 2-SPEED TRANSMISSION cylinder thus decreasing the displacement control of the motor to the minimum setting. Removal of the pressure signal from the foot pedals will cause the displacement control spool to return to the neutral position, shutting off the pressure to the displacement control cylinder thus increasing displacement to maximum.

726M-058

The angle of the pistons relative to the drive shaft determine the speed of the motor and the available torque. Reducing the angle provides increased speed with less torque. Increasing the angle will reduce the speed and provide more torque.

The angle of the pistons is variable and is changed by an internal control cylinder that receives high pressure oil via the MOTOR's pressure override valve (POR) and a displacement control spool.

The spool in the POR valve is moved by system pressure from the high pressure side of the loop.

When the POR spool moves as a result of high pressures it reduces the pressure directed to the displacement control cylinder. The reduced pressure will cause the displacement control piston to move. The point at which the displacement control spool begins to move is known as "begin of stroke set point" or "pressure override set point".

•

The displacement control spool is operated by pilot pressure from the forward and reverse foot pedals via the speed control joystick. When sufficient pressure from the pedals is directed to the spool, it shifts against a spring and directs oil past the POR valve to the displacement control

FLUSHING VALVE

•

ROTATING GROUP

PORT 'M1'

AQ010-5Y

'A'

•

PORT 'A'

PORT 'B'

•

BEGIN OF STROKE ADJUSTING SCREW PORT 'G'

• M724D-01

•

VIEW 'A'

POR ADJUSTING SCREW

DRIVE SHAFT

•

•

•

PORT 'X'

SINGLE DRIVE MOTOR ~ REXROTH (160CC SIZE) 8.8

MINIMUM DISPLACEMENT ADJUSTING SCREW

Tigercat M726D Mulcher

Drive

FLUSHING VALVE

•

MAX

CONTROL CYLINDER

MIN

• POR VALVE

DISPLACEMENT CONTROL SPOOL

•

FROM PEDALS AND SPEED CONTROL FROM PUMP

720C-24

FROM PUMP

726M-059

DRIVE MOTOR SCHEMATIC (REXROTH)

The MOTOR POR set point must be correctly set for the system to function properly. Refer to DRIVE MOTOR PRESSURE SETTINGS in THIS SECTION .

A minimum displacement adjusting screw on the outside of the motor housing limits the maximum speed of the motor.

WARNING: Improper adjustment of Minimum displacement adjusting screw can result in motor and transmission failure due to overspeeding.

When installing a new motor always ensure stroke limiting screw is set correctly. Refer to SET MOTOR MINIMUM DISPLACEMENT, in this section.

A flushing valve is incorporated into the motor.

This valve provides a regulated flow of oil from the low pressure side of the loop in the motor case. This action reduces the possibility of particle build up in the loop by providing a continuous change of oil, it also assists with cooling. This valve is factory set and requires no adjusting.

NOTE** The term "begin of stroke set point" or "pressure override set point" can also be known as "begin of displacement regulation" or "begin of regulation" or "begin of displacement" or "motor POR". In this manual it will be referred to as MOTOR POR.

8.9

DRIVE MOTOR

Tigercat M726D Mulcher

Drive

DRIVE PEDAL PILOT VALVE

At the same time the regulating spool (2) is moved through the regulating spring (3).

When the regulating stroke begins, there is a connection from port 'P' via hole (8) in the spool and work ports 1 and 2 in the base of the valve, to the swashplate control valve on the drive pump.

Pressure provided by the drive charge pump at ports 1 and 2 is directly proportional to the position of the operator's foot on the foot pedal and the regulating spring characteristic.

1

2

P

T

DRIVE PILOT VALVE

AU004

This pilot valve is a manually operated directional valve and operates on the same principal as a direct operating pressure reducing valve.

Operated by foot, this valve directs oil pressure* provided by the drive charge pump, to the swashplate control valve on the drive pump to drive the machine either forward or reverse.

•

5

• •

4

•

2

3

•

1

•

• • •

•

8

'P' PORT

AU013-1

WORK PORTS 1, OR 2

SPOOL ARRANGEMENT

AU013-2

OPERATING DESCRIPTION In the neutral position the foot pedal is held centered by return spring (4).

When the pedal (1) is operated, the plunger (5) is pushed against the return spring (4).

8.10

Tigercat M726D Mulcher

Drive

DRIVE PREVENT VALVE The drive prevent valve is located under the cab.

This solenoid operated spool valve prevents the machine from being driven either forward or reverse when the parking brake is ON. UNDERSIDE OF CAB

DRIVE PREVENT VALVE

•

••

DRIVE PREVENT VALVE

724D-D24

SOLENOID AND CONNECTOR

SM-29

• P1

•

P2

SPOOL SECTION VALVE BLOCK

• •

PORT 1

PORT 2 V-04

DRIVE PREVENT VALVE

OPERATING DESCRIPTION When the solenoid valve is de-energized (parking brake ON) the spool cross connects the forward and reverse pilot lines causing drive charge pump oil to return to tank in the event the foot control is operated. This prevents the foot control from supplying pressure to the drive pump displacement controller.

When the solenoid valve is energized (parking brake OFF), the spool in the drive prevent valve shifts and blocks the cross connection between the forward and reverse pilot line. This allows the foot control (forward or reverse) to send drive charge pump pressure* to the drive pump displacement controller.

8.11

Tigercat M726D Mulcher

Drive

SPEED CONTROL LEVER VALVE •

5

• •

4

•

2

3

•

1

•

• • •

•

8

'P' PORT WORK PORTS 1, 2

SPOOL ARRANGEMENT

AU013-1

AU013-2

OPERATING DESCRIPTION When the lever (1) is operated, plunger (5) is pushed against the return spring (4). The friction clutch makes the lever infinitely adjustable.

At the same time, control spool (2) is moved by control spring (3).

AW020

As the spool moves down, the control chamber to tank connection is closed. As the spool continues to move, the connection between input pressure (P) and the control chamber is opened and the pressure is then able to build up in the control chamber.

SPEED CONTROL LEVER VALVE

This pilot valve is a manually operated directional control valve and operates on the same principal as a direct operating pressure reducing valve.

The control lever, the joystick and foot control valves use similar spool arrangements.

Once the pressure equals the value set by control spring (3), the control spool closes the loop and there is a connection to work port 2.

Oil flow is directly proportional to the position of the control lever setting by the operator and the control spring (3) characteristics.

This control valve is used to control the amount of pilot oil supplied to the drive motor, limiting the maximum speed of the vehicle and allowing the operator to maintain a given speed without having to feather the drive pedals. When the lever is pushed fully forward oil is supplied to the drive motors at pilot pressure (450 psi). When pulled all the way back the machine will be in CREEP MODE. The speed control lever has a friction clutch which is infinitely adjustable and can be used while the machine is in motion.

SPEED CONTROL LEVER

•

Refer also to SPEED CONTROL LEVER in SECTION 2 of the OPERATOR'S MANUAL and SPEED CONTROL LEVER ADJUSTMENT in SECTION 3 of THIS MANUAL.

M724D-02

8.12

SPEED CONTROL LEVER

Tigercat M726D Mulcher

726M-062

Drive

DRIVE CIRCUIT - SINGLE MOTOR 2 -SPEED TRANSMISSION 8.13

Tigercat M726D Mulcher

Drive

TEST DRIVE

DRIVE MOTOR PRESSURE OVERRIDE (POR) CONTROL PRESSURE:

SINGLE MOTOR 2-SPEED TRANSMISSION

1. Shift the transmission to HIGH RANGE, turn ON both front and rear differential locks.

Ensure drive limiter switch is OFF. Set throttle control to FULL.

Note: This procedure is for a Rexroth pump and Rexroth single motor installation.

This test drive will verify the following: 1.

2.

3.

4.

5.

6.

7.

8.

Drive motor pressure override.

Engine horsepower audit Transmission low and high Ranges.

Drive limiter function.

Front and rear differential lock functions.

Mulcher/Saw recovery time.

Boom functions Parking brake operation.

2. Drive the machine FORWARD at FULL SPEED. Apply the foot brake to slow the machine. The pressure at 'MA' on the drive pump will begin to rise.

3. When the 'MA' gauge on the DRIVE PUMP reads 5650 psi., the pressure at the 'M1' gauge on the DRIVE MOTOR should rise to 2000 - 2600 psi., pause for a moment, then spike to over 3000 psi.

Install a 0 - 5,000 psi. gauge at the 'M1' port of the DRIVE MOTOR, and a 0 - 10,000 psi. gauge at the 'M1' port of the DRIVE PUMP.

Note: If these results cannot be obtained, refer to DRIVE MOTOR PRESSURE SETTINGS AND ADJUSTMENTS in THIS SECTION.

NOTE: Fasten these gauges so that they can be viewed from the operator’s seat in the cab.

Fasten your seat belt and move the machine to a suitable test area, where it can be safely driven at full speed for approximately 150 feet.

ENGINE HORSEPOWER AUDIT: 1. Install the articulation lock bar to prevent the machine from steering.

IMPORTANT: Shifting gears while machine is moving will result in transmission damage.

Shift gears only when machine is stationary.

Slight movement of the steering joystick may be used to aid shifting. Do not press drive pedals to 'nudge' machine when shifting.

2. Set the throttle control to FULL. Verify the tachometer reading at high idle 1920 ± 25 RPM. 3a. Leave the THROTTLE control set to FULL. 3b Turn A/C switch OFF and set FAN speed to FULL ON (OVERRIDE).

IMPORTANT: Foot brake must only be applied for 5 -10 seconds followed each time by a minimum 20 second cool down period. Failure to do so will result in 'burn out' of the rear axle brake.

"G" TEST PORT

••

"G" (CHARGE)

"MA" (REVERSE) "A"

MIN DISPLACEMENT SCREW

•

••

•

••

••

•• •• 726M-059

••

MAX DISPLACEMENT SCREW "MB" (FORWARD) "M1" TEST PORT

726M-060

DRIVE MOTOR

8.14

DRIVE PUMP

"B"

Tigercat M726D Mulcher 3c. Operate the BOOM TILT function and STEER the machine.

4. While doing the above, carefully drive the machine FORWARD and apply the foot brake to develop a reading of 5650 psi pressure at the 'MA' gauge on the DRIVE PUMP. 5. Observe the engine rpm while doing the above. The engine should lug down to 1800 RPM. Note: This test may have to be done a few times to get a proper reading.

TRANSMISSION LOW AND HIGH RANGES: 1. Bring machine to a full stop, apply foot brake, set throttle to IDLE and shift to HIGH RANGE. 2. Operate the machine at FULL throttle and FULL forward drive pedal. Speed should be 4.4 seconds for 5 wheel revolutions.

3. Bring machine to a full stop, apply foot brake, set throttle to IDLE and shift to LOW RANGE. 4. Operate the machine at FULL throttle and FULL forward drive pedal. Speed should be 10.6 seconds for 5 wheel revolutions.

Drive DIFFERENTIAL LOCKS: 1. Bring machine to a full stop, set throttle to IDLE, ensure both front and rear differential lock switches are turned OFF. Steer machine without depressing drive pedal.

All wheels should rotate as machine is being steered. Steer several times, check all wheels.

2. Turn only the front differential lock switch ON. While steering the machine, both front wheels should slide instead of rotating. Rear wheels should still rotate.

3. Turn front differential lock switch OFF. 4. Turn only the rear differential lock switch ON. While steering the machine, both rear wheels should slide instead of rotating.

Front wheels should still rotate.

ATTACHMENT MOTOR POR CONTROL PRESSURE, NOTE: Refer to SECTION 17 OF THIS MANUAL for testing, setup and servicing procedures.

BOOM FUNCTIONS Test all boom functions for proper operation (lift, tilt, accumulating arms, clamp arms).

DRIVE LIMITER FUNCTION NOTE: Placing drive limiter switch in the ON position (when the saw/cutter switch is also in the ON position) activates the drive limiting system. This system detects drops in engine rpm and automatically limits power to machine drive function(s) in order to prevent engine stalling and divert maximum engine horsepower to the mulching head.

CHECKING FOR PROPER PARKING BRAKE ADJUSTMENT The parking brake is properly adjusted when resistance is encountered half way through the brake lever’s travel.

Refer to SECTION 9 of THIS MANUAL for adjusting procedure and additional information on brakes.

CAUTION Ensure that all personnel are clear of the attachment.

1. Shift transmission to LOW RANGE, turn the cutter switch and drive limiter switch ON, set throttle to 1600 +/- 25 rpm, drive machine FORWARD at FULL SPEED. Record time for 5 wheel revolutions.

2. Turn drive limiter switch OFF, keep at FULL throttle, apply FULL forward drive pedal. record time for 5 wheel revolutions.

3. Time with drive limiter switch OFF should be approximately 1/2 to 1/3 of that when drive limiter switch was ON.

HYDRAULIC OIL HEAT-UP 1. Block Air Flow through Oil Cooler, intake side of the Heat Exchanger, with Cardboard. DO NOT block Engine Radiator or Charge Air Cooler.

2. Full Throttle - Operate Clamp Close and Steer for 15 sec, then off for 5 sec, Repeat.

Monitor Engine Temperature and Hydraulic Oil Temperature until Hydraulic Oil Temperature reaches 130 ° F. This procedure will take 20-30min depending on Ambient Air Temperature.

8.15

Tigercat M726D Mulcher

Drive

DRIVE PUMP AND MOTOR PRESSURE SETTINGS AND ADJUSTMENTS dual motor 1-speed transmission

"A"

1. Park the machine on level ground, lower attachment to the ground, set parking brake and install articulation lock.

•

CHARGE PRESSURE RELIEF • 5 MM ALLEN KEY • 17 MM WRENCH

•• •• •

2. Caution: DO NOT adjust the Maximum Displacement Screw located on the bottom side of the motor. Remove Minimum Displacement Adjusting Screw (top of Motor) and measure its overall length. Set exposed thread (above locknut) as per FAR specification.

"G" TEST PORT

"G" (CHARGE)

"MA" (REVERSE)

•

MIN DISPLACEMENT SCREW

•

•

•• "MB" (FORWARD) 726M-060

••

POR VALVE

"B"

DRIVE PUMP

6. Set charge pressure at pump to 450 psi, measured at charge pressure gauge port (G).

• •• 726M-059

7. Turn in the pump pressure override valve (POR) until lightly seated, then turn out ½ turn. POR adjusting screw is located in the bottom right of the drive pump.

MAX DISPLACEMENT SCREW

"M1" TEST PORT

DRIVE MOTOR

3. Start engine and raise hydraulic oil temperature to 130-140°F as per HYDRAULIC OIL HEAT-UP procedure in this section.

4. Engine off, install gauges at the following locations: Drive Pump

8. Engine at 1800 rpm, fully depress foot brake and fully depress the forward drive pedal. Set the high-pressure forward relief valve at port B on the pump to 5650 psi measured at (MB).

Note: When simultaneously pressing the foot brake and drive pedal, do not hold down the pedals for more than 8 secs. After a max of 8 seconds, release pressure on both pedals and wait 5 secs to avoid overheating the relief valve.

9. Engine at 1800 rpm, fully depress foot brake and fully depress the reverse drive pedal. Set the high-pressure reverse relief valve at port A on the pump to 5650 psi measured at (MA).

MA (Reverse) 10,000 psi gauge MB (Forward) 10,000 psi gauge G (Charge) 500 psi gauge Drive Motor

10. With the engine still at 1800 rpm fully depress the foot brake and forward drive pedal and set the pump POR to 4000-4500 psi (measured at MB). Note: This is a temporary setting.

M1 (Control Pressure) 10,000 psi gauge Speed Control Joystick X (Drive motor control line) 500 psi gauge

11. Turn the drive motor POR in all the way until it lightly seats.

Install in port X of speed control joystick by teeing into the motor control line 5. Shift the transmission into high range, start the engine and set the throttle to 1380 rpm.

8.16

Tigercat M726D Mulcher

Drive

MINIMUM DISPLACEMENT ADJUSTING SCREW - 6MM ALLEN KEY - 19MM WRENCH DIM. 'X' = 5/8" (16MM) FOR A 90MM LONG SCREW

•

P.O.R. ADJUSTING SCREW

•

PORT 'X'

•

•

AQ010-1

BEGIN OF DISPLACEMENT ADJUSTING SCREW - 3MM ALLEN KEY - 10MM WRENCH PORT 'B'

AQ010-5Y

MAXIMUM DISPLACEMENT ADJUSTING SCREW (DO NOT ADJUST) FOR REFERENCE ONLY: DIM. 'X' = 5/8" (16MM) FOR A 50MM LONG SCREW

PORT 'A'

'A'

•

VIEW 'A'

•

PORT 'M1' • 6 ORB 1/4" ALLEN KEY

DRIVE MOTOR (160CC SIZE) 12. With the engine still at 1800 rpm, fully depress the foot brake and forward drive pedal and adjust the speed control joystick so that the gauge reads 135 psi. Set the begin of displacement screw (BODC) (top centre of motor control) to 2000-2200 psi, measured at port M1 (lower RHS of motor). Note: The BODC screw is very sensitive, very fine adjustment is required to correctly set the pressure.

BEGIN OF DISPLACEMENT ADJUSTING SCREW - 3MM ALLEN KEY - 10MM WRENCH

MOTOR PRESSURE OVERRIDE ADJUSTING SCREW (P.O.R.) "G" TEST PORT

••

13. Fully depress the foot brake and reverse drive pedal and adjust the speed control joystick to 125 psi. The motor should not stroke and a low-pressure reading of 800 psi or less should be obtained at M1 of the drive motor.

If these readings are obtained then the motor will begin to stroke between 125 psi and 135 psi. If these readings are not obtained repeat step 11 until the correct set points are achieved.

MIN DISPLACEMENT SCREW

•• ••

••

• ••

14. Put the speed control joystick to full speed, a reading of 450-460 psi should be obtained at port A of the joystick. Fully depress the foot brake and forward drive pedal and turn the motor POR out to 2000-2200 psi.

726M-059

15. Set the pump POR to 5050 psi (measured at MB).

16. Remove all pressure gauges and reinstall all plugs, caps and hoses.

8.17

MAX DISPLACEMENT SCREW

"M1" TEST PORT

DRIVE MOTOR

Tigercat M726D Mulcher

Drive

PRESSURE SETTINGS M726D With hydraulic oil at operating temperature (120°F - 140°F) Location

Pressure (PSI)

Engine RPM

Engine RPM 1920 ± 25 High Idle 850 ± 25 Low Idle

Pilot Manifold Pressure Relief Valve Pressure Reducing Valve

675 550

850 850

Drive Pump - Single Motor Two Speed Charge Pressure Relief Valve Multi Function Valve: · P.O.R. Forward · P.O.R. Reverse · High Pressure Relief Forward · High Pressure Relief Reverse

450

1380

5050 5050 5650 5650

1800 1800

Drive Motor - Single Motor Two Speed Drive Motor P.O.R.

2000-2200

1800

2500 3200 3200

1800 850 850

Steer Valve (Joystick Steering Only) Steer Valve Main Relief Steer Right Port Relief Steer Left Port Relief Attachment Circuit Mulching Head Spike Relief Cutter Control Vavle Main Relief Pump P.O.R. Saw Mode Remote P.O.R. Load Sense Standby Differential Pressure

Early Machines 5800 5500 5000 NA 600 NA

Boom Valve Inlet Main Relief Tilt In Port Relief Tilt Out Port Relief Accumulator Clamp Open Port Relief Accumulator Clamp Close Port Relief Clamp Open Port Relief Clamp Close Port Relief Boom Lift Port Relief Boom Lower Port Relief

Later Machines 5600 5300 4800 3600 NA 218 2600 2900 2900 3200 3200 1100 3200 2900 2200

1200 1200 1200 1200 1200 1200 1800 850 850 850 850 850 850 850 850

IMPORTANT NOTES: ~ Boom support must be used part# 4128A ~ When performing tilt out function, without an attachment installed, do not allow crank arms to hit boom Early Machines - Serial Number 726M3001 to 726M3020 ~ Later Machines - Serial Number 726M3021 And Up

8.18

Tigercat M726D Mulcher

Drive

TRANSMISSION

OPERATION

SINGLE MOTOR 2-SPEED TRANSMISSION

Pulling up or pushing down the gearshift lever inside the cab moves the shift lever (1) on the transmission, which moves the shift collar (2), to connect either the LOW gear (3) or the HIGH gear (4) to the output shaft (5).

The two speed manual shift transmission drives both the front and rear axles of the machine.

Power is supplied by the hydrostatic drive motor mounted to the input side of the transmission.

The output shaft transmits power to both the front and rear axles.

Detent balls (6) between the collar and output shaft provide positive feel for the selected range.

This results in either low speed operation , or high speed operation. The mid position is neutral.

A lubrication pump (7) mounted on the front of the transmission and driven off the end of the input shaft (8) provides oil to lubricate the gears and bearings and also the splines of the hydrostatic drive motor. Oil is channelled to these areas via a passageway and a series of crossed drilled holes in the input shaft. Additional lubrication is provided by escaping oil from the input shaft and also oil splashed up on to the gears from the sump in the bottom of the transmission. The oil level in the gearbox must be up to the level marked on the dipstick. For the recommended lubricant refer to SECTION 3 of THIS MANUAL.

NOTE: Shift gears only when the machine is stationary and on level ground. Slight movement of the steering joystick may be required to facilitate shifting from one gear to the next.

The transmission must be in neutral for machine to be towed by another vehicle. For more information on towing, refer to TOWING INSTRUCTIONS in SECTION 2 of the OPERATOR'S MANUAL.

INPUT SHAFT (8)

INPUT SHAFT (8) LUBRICATION PUMP (7)

•

FROM MOTOR

•

LUBRICATION PUMP (7)

•

FROM MOTOR

SHIFT COLLAR (2)

SHIFT COLLAR (2) SHIFT LEVER (1)

SHIFT LEVER (1)

•

DETENT BALLS (6)

• REAR AXLE

•

• •

FRONT AXLE

•

FRONT AXLE

• •

•

OUTPUT SHAFT (5)

REAR AXLE

•

•

OUTPUT SHAFT (5)

LOW GEAR (3)

HIGH GEAR (4)

LOW GEAR (3)

HIGH GEAR (4)

HIGH SPEED OPERATION

LOW SPEED OPERATION 2-SPEED TRANSMISSION 720B15

8.19

Tigercat M726D Mulcher

Drive

TRANSMISSION SHIFT LEVER (2-SPEED TRANSMISSION ONLY)

8

LEVER ADJUSTMENT

•

The 2-speed transmission gear shift lever is located at the right side, behind the seat. Lever UP is HIGH speed, NEUTRAL in the center and DOWN is LOW speed. If required, these positions can be adjusted at the transmission end of the cable.

To shorten or lengthen the cable, remove the cotter pin and the clevis pin and loosen the jam nut, screw the clevis on or off the cable to change the cable length. Tighten the jam nut, replace the clevis pin and cotter pin. The outer cable can be adjusted by adjusting the two jam nuts holding it in the support bracket.

229-20

GEAR SHIFT LEVER

BELLCRANK

HEX NUT 7/16"

CLEVIS CABLE END

CLEVIS SHIFT LEVER "U" BOLT

COTTER PIN

CABLE HOLD DOWN NUT

CLEVIS PIN

CABLE

TRANSMISSION

JAM NUTS

720B23

SHIFT CABLE ADJUSTMENT 8.20

Tigercat M726D Mulcher

Drive

FRONT DRIVE SHAFT

nut hand tight only. Be sure to align front and rear yoke in the same plane (see illustration).

Assembly and installation of a front drive shaft assembly.

1. Park machine on level ground, install articulation lock bar, lower felling head to ground, stop engine, pull parking brake ON and block wheels.

NOTE: For this repair, front and rear chassis must be aligned.

2. Remove the upper guards and cover plates and belly pan access door on front chassis.

9. Carefully clamp flat wing of yoke in a vice and torque the large 1 1/4"- 18 UNEF retaining nut to 475-525 lbf-ft. DO NOT CLAMP TUBULAR PART OF DRIVE SHAFT IN VICE. FRONT DRIVE SHAFT AND PILLOW BLOCK BEARING INSTALLATION IN TO MACHINE: 1. Install front drive shaft and pillow block bearing first. Attach front universal, leave pillow block mounting bolts loose and attach grease line.

2. Install mid drive shaft and tighten all universal joints. For torque values, refer to TORQUE CHART in SECTION 3 of THIS MANUAL.

3. Remove the mid drive shaft first by separating the two universal joints.

4. Remove the front drive shaft and pillow block bearing. Remove the grease line from the pillow block bearing, unbolt the bearing from the chassis and separate the front universal joint.

IMPORTANT The mid shaft should not be installed backwards. The slip shaft end of mid drive shaft must fasten to the universal joint at the transmission as illustrtated.

PILLOW BLOCK BEARING INSTALLATION ONTO FRONT DRIVE SHAFT: 1. Remove the yoke retaining nut and the yoke from the front drive shaft. DO NOT clamp the TUBULAR portion of the drive shaft in a vice during any of the assembly process.

3. Care must be taken to correctly align the front and rear chassis before tightening the pillow block bearing bolts. The front drive shaft must line up directly on center with the center steering articulation pin.

2. Slide the old pillow block bearing off of the drive shaft.

NOTE: To align the front and rear chassis, measure the distance between outer axle bearing grease fitting on the front and rear axles on one side of the machine. Then measure the same distance on the other side of the machine. Articulate the machine to get the same reading on both sides.

3. Remove the set screw supplied with the bearing and discard.

4. Remove the grease fitting supplied with the new bearing and discard. Care should be taken not to lose the locking pin inside the bearing housing.

4. Holding the front and rear chassis and the front drive shaft in alignment, tighten the two pillow block bearing bolts (3/4” UNC x 2”) with hardened washers under heads. Use LOCTITE 242 (blue - removable) and torque to 357 lbf-ft.

5. Make sure that the locking pin is properly positioned inside the bearing housing. Install the 90° grease fitting (from the grease line assembly) to ensure that the locking pin stays properly positioned within the dimple in the outer race of the bearing.

5. Re-install the grease line to the pillow block bearing.

6. Use anti-seize on the shaft. Install the new pillow block bearing with the long extension (set screw side) facing the splined end of the shaft (rear of machine). The bearing must slide freely on the shaft.

6. Slowly add grease to the pillow block bearing using a hand grease gun until it starts to leak from the bearing. Be careful not to 'pop' the grease seal by adding grease too rapidly.

7. Install the set screw supplied with the new bearing lining it up with the slot in the shaft.

The bearing must slide freely along the shaft, for the length of the set screw slot.

NOTE: DO NOT use a power greaser.

Also refer to MIDDLE AND REAR DRIVE SHAFT SPLINE LUBRICATION in SECTION 3 of THIS MANUAL.

8. Use anti-seize on the shaft splines and install the yoke onto the drive shaft. Install retaining 8.21

Tigercat M726D Mulcher

Drive FRONT AXLE

GREASE LINE

SET SCREW UNIVERSALS

PILLOW BLOCK BEARING YOKE RETAINING NUT

FRONT DRIVE SHAFT SLIP SPLINE

DUST CAP FLAT WING OF YOKE YOKE

TRANSMISSION REAR OUTPUT YOKE

SPLINES RELIEF FITTING SEALS

MIDDLE DRIVE SHAFT SLIP SHAFT

GREASE FITTING SLIP SPLINE

TRANSMISSION FRONT OUTPUT YOKE REAR AXLE

REAR DRIVE SHAFT SLIP SPLINE SEAL

M724D-31

DRIVE SHAFT INSTALLATION 8.22

GREASE FITTING

Tigercat M726D Mulcher AXLES

Drive

Power from the drive motors is transmitted to the front and rear axles via the transmission and the front and rear drive shafts.

The front axle assembly is bolted directly to the front chassis. The rear axle assembly is pivot mounted to the rear chassis, allowing oscillation of the axle.

DRAIN (TOP)

Apart from the mounting, both front and rear axle assemblies are configured in a similar way except that the rear axle has internal service brakes and the front axle has none.

DIFF. LOCK (BTM.)

Each axle assembly consists of an input yoke (1), a spiral bevel gear set (2), a differential gear set (3), hydraulic differential locks (4), inboard multiple wet disk brakes (5) (one each side in rear axle only), inboard planetary final drives (6) (one each side) and axle housings and shafts (7).

FRONT AXLE

26KSM

PIVOT LUBRICATION POINT

DIFF. LOCK (BTM.)

BRAKE

The final drive (6) is an inboard mounted planetary gear arrangement which further reduces speed and increases torque to the axles. The input side receives drive power from the differential via a sun gear shaft. The output side (planetary carrier) is splined on to the axle.

DRAIN (TOP)

The lubricant in both axle assemblies is hydraulic oil. There are drain lines from each axle plumbed to the machine's hydraulic system. These drain lines take care of internal leakage originating from the differential locks, which use the same hydraulic oil as the machine's hydraulic system.

Refer also to AXLE LUBRICATION in THIS SECTION.

1

PIVOT LUBRICATION POINT

REAR AXLE 27KSM

AXLE HYDRAULIC CONNECTIONS

2 4

6

7

3

5 AXL-4X

AXLE ASSEMBLY CROSS SECTION (REAR SHOWN) 8.23

Tigercat M726D Mulcher

Drive

DIFFERENTIAL AND DIFFERENTIAL LOCKS BRAKE DISC

The differentials (3) distribute the power to each side of the axle while allowing the wheels to turn at different speeds. The differential locks (4), in the front and rear axle assemblies, are hydraulically controlled and can be independently turned ON or OFF by switches in the cab.

BACKING PLATE

Placing one or both switches in the ON position, energizes the differential lock control valve solenoid(s) (located on the pilot manifold) and directs pilot oil to the corresponding differential clutch pack assembly pistons to lock the differential(s).

ANNULAR PISTON

AXL-BRK ANNULAR BRAKE depressed, brake pressure oil moves the piston up against the brake disc and traps it between the piston and the backing plate to apply the brakes.

Maximum operating pressure for the brakes is 1000 psi. For information on the hydraulic circuit, refer to SECTION 9 of THIS MANUAL.

This condition provides positive drive to both wheels of the axle when tractive conditions might otherwise allow one wheel to spin.

IMPORTANT

BRAKE LINING INSPECTION (REAR AXLE ONLY)

Differential locks should only be used when additional traction is needed.

Inspection ports are provided in the differential case and are located on each side of the pivot boss when viewed from the opposite side of the input shaft. Before inspecting the brakes the axle must be drained. Refer to DRAINING THE AXLES in THIS SECTION.

SERVICE BRAKES (REAR AXLE ONLY) The "wet" disc type service brakes consist of an annular piston, a brake disc with brake facing material, and a brake backing plate. One brake assembly is located on each side of the differential case and before the final drive.

• • •

The piston and the backing plate are attached to the case and the brake disc is splined on to the sun gear of the planetary final drive.

When the brake foot control pedal in the cab is

1

Remove brake inspection port plugs.

Inspect brake linings on both sides of disc.

If brake lining material is worn down to the bottom of the oil grooves, brake backing plate and annular piston pressure plate assemblies must be replaced.

2 4

6

7

3

5 AXL-4X

AXLE ASSEMBLY CROSS SECTION (REAR SHOWN) 8.24

Tigercat M726D Mulcher

Drive

BRAKE BLEEDING The rear axle assembly is equipped with two brake bleed screws, one for each side. Brakes must be bled whenever there has been potential for air to enter the system, such as removal of hydraulic lines. Both passages must be bled, one at a time.

SINGLE BRAKE LINE ACTUATES BOTH BRAKES IN REAR AXLE

BLEED SCREWS

SINGLE BRAKE PEDAL

REAR AXLE ASSEMBLY

AXL-BRK1

AXLE LUBRICATION The axles are allowed to completely fill with oil to the top of the differential case. This hydraulic oil buildup inside the differential case is due to normal internal leakage from the differential locks and is used as lubricant for the differential. The excess oil drains back to the hydraulic tank via the axle drain line.

DRAINING THE AXLES Care should be taken when draining the hydraulic oil from the axles, not to also drain the oil from the hydraulic tank. To prevent oil from siphoning from the tank, first remove the hydraulic drain line from the top of the axle to allow air to vent into the axle when the bottom drain plug is removed and oil drains out. The line that is removed must be capped to prevent draining from the hydraulic tank.

The time to schedule an oil change in the axles is when doing the seasonal oil change on the hydraulic oil tank, as they are part of the overall system and use the same oil.

DUAL BRAKES (REAR AXLE)

IMPORTANT

PROCEDURE

Care should be taken to refill the axle(s) before moving the machine after draining.

1. Place parking brake ON. 2. Place a clear plastic tube over bleed screw with other end in a container.

3. Start engine and set throttle at IDLE. 4. Loosen bleed screw.

5. With the aid of an assistant push and hold brake pedal down until brake bleeding is complete (no air bubbles in clear plastic tube).

6. Tighten bleed screw when oil is free of air.

7. Release brake foot pedal.

FILLING THE AXLES The axles must be filled by pumping oil in through the ports on the front of the differential housing on the front axle and the top left side of the differential housing on the rear axle.

Front Axle: Remove the two pipe plugs on the front face of the differential housing on the front axle, use one to fill the axle with and the other as a breather to allow air to vent out and also to allow oil to exit when the axle is full of oil.

REMOVE BOTH PLUGS, USE ONE FOR FILLING AND ONE FOR BREATHER

8. Repeat above steps for the other bleed screw.

••

724D-D30

8.25

•

FRONT AXLE

Tigercat M726D Mulcher

Drive ALTERNATIVE METHOD OF FILLING AXLES The following alternative method of filling the axles with oil applies when only the axles have been drained of oil and not the hydraulic tank as well. If a major service has been done, the replacement of any major component or the complete machine has been drained of hydraulic oil, refer to START-UP PROCEDURE AFTER MAJOR MACHINE MAINTENANCE in SECTION 3 of THIS MANUAL.

• • CASE DRAIN PLUG

1. Ensure the articulation lock pin is installed.

2. With engine at IDLE, parking brake ON, hold foot brake down, bleed brakes in front axle.

VENT PLUG

3. Turn both differential locks ON and run engine at IDLE for 30 minutes, this procedure will fill the axles with hydraulic oil and purge the air from them at the same time. (axles fill with controlled leakage from diff. locks). If wheels have been removed, operate forward and reverse pedals very slowly to fill axles with oil.

4. Set throttle to IDLE and run each function for 2 minutes to purge air from circuit.

635-P06

5. Set throttle to FULL and run each function again for 2 minutes to flush circuit.

REAR AXLE (LEFT SIDE OF MACHINE)

6. With cylinders fully retracted, top up the hydraulic oil reservoir with clean hydraulic oil.

Rear Axle: Remove the two plugs* located on the front feft side of the rear axle. To access these plugs remove the hose guard bolted to the axle with three bolts. Tilt the left side of the axle down to facilitate better access. Use the case drain plug to fill the axle and the vent plug* to vent air

NOTE:If the machine was on wheels, the steer and drive functions would not have been properly purged or flushed. Remove the articulation lock pin and at LOW IDLE, slowly operate the steer function right and left a few times. With the parking brake released and at LOW IDLE, slowly operate the drive function forward and reverse a few times.

*NOTE: If ONLY the axles were drained and not the entire hydraulic system, the port from which the drain line was removed will provide the vent and oil will exit from this port when the axle is full of oil. The drain line should remain capped until it is reinstalled.

NOTE: If possible, allow the machine to stand for 4 to 6 hours before setting any of the operating pressures. This will allow any air bubbles trapped in the oil to escape, this will also be a good time to check for leaks.

Care must be taken to ensure that both axles are completely full of oil and that all plugs, fittings and lines are tight.

CAPACITIES For front and rear axle oil fill capacities, refer to the table: SERVICE AND LUBRICATION in SECTION 3 of THIS MANUAL.

8.26

Tigercat M726D Mulcher REAR AXLE OSCILLATION SHIM CHECK AND ADJUSTMENT

Drive 3.

Set a dial indicator against the input pinion shaft on the input end of the axle.

1. The axle must be securely bolted to the chassis through the axle supports (front and back). Torque all axle mounting bolts. Refer to TORQUE CHART in SECTION 3 of THIS MANUAL. 2. Temporarily disconnect the two grease hoses from the axle pivot to prevent grease pressure from affecting the set-up. Plug hose ends to avoid contamination.

DISCONNECT REAR PIVOT GREASE HOSE

AXLE-05

SET DIAL INDICATOR

4. Using a long pry bar between the chassis and the axle housing pry the axle backward. It may be necessary to tip the axle from side to side to position the axle fully back for a proper reading.

••

AXLE-13

••

AXLE-06

USE LONG PRY BAR

AXLE-07

BETWEEN CHASSIS AND AXLE HOUSING

DISCONNECT FRONT PIVOT GREASE HOSE

724D-D31

8.27

Tigercat M726D Mulcher

Drive 10. Remove the outer cover plate. Carefully remove the centre pivot cover plate from the axle (6 bolts). Care must be taken to ensure that the thrust washer (a round perforated disk) and shims do not fall.

AXLE-10

TIP AXLE SIDE TO SIDE

AXLE-12

REMOVE CENTER PIVOT COVER

SHIMS

•• AXLE-11

TIP AXLE SIDE TO SIDE

THRUST WASHER

••

5. Zero the dial indicator.

6. Using a long pry bar between the chassis and the axle housing pry the axle forward. It may be necessary to tip the axle from side to side to position the axle fully forward for a proper reading.

AXLE-16

THRUST WASHER AND SHIMS

11. If the measurement was below .004” ADD shims to get the required range. A 0.010” shim will change the reading by 0.010”. Stock shims are 0.010” and 0.040” thick.

7. Read the dial indicator. Axle movement should be .004” to .014”. Check the reading twice by repeating steps 4 through 7.

12. If the measurement was above .014” REMOVE SHIMS to correct the reading. A 0.010” shim will change the reading by 0.010”. Stock shims are 0.010” and 0.040” thick.

8. If the reading is within the required range go to step 16.

9. If the reading is not within the required range follow steps 10 through 15 to adjust.

13. Replace the thrust washer.

14. Replace the center pivot front cover plate.

Make sure that the thrust washer and shims do not slide out of place and become damaged.

Torque cover bolts (6) to 80 lbf-ft.

15. Repeat steps 4 to 7 to check the adjustment again. This reading should be checked twice.

16. Reinstall cover plate and grease hoses in the axle pivot, add grease until back pressure is felt.

8.28

Tigercat M726D Mulcher

Drive

WHEEL INSTALLATION NOTE: All wheel installation joints and surfaces should be clean, flat surfaces (free of paint, grease and oil etc.) using grade 8 bolts, hardened washers and standard torque practices.

• Use tapered assembly studs to help with wheel installation. Two or three studs can be used on each side.

2.17" MIN. FULL THREAD

.79" .406" DRILL

.06" X 45° 7/8" - 14 UNF THREAD

20°

2.64" 3.41"

TAPERED ASSEMBLY STUD FOR 7/8" BOLTS AXL-WHL

The tapered assembly stud shown can be fabricated to aid in wheel installation on an axle flange.

•

Thoroughly clean the wheel bolts, washers and the tapped holes in the axle flange.

When cleaning axle wheel flange, be sure to use the proper thread size tap, 7/8" - 14 UNF thread.

• Install the wheel with the aid of the tapered assembly studs.

• Install wheel bolts by hand to insure bolts are not cross threaded.

• Remove assembly studs and install the remaining bolts.

• Torque wheel bolts to the following values: 7/8"-14 UNF torque to 500-550 lbf/ft. lubricated.

WARNING If a power wrench is used, be sure that the wheel bolts are first hand-engaged to prevent stripping. Operate the wrench slowly to prevent damage to the threads.

8.29

Tigercat M726D Mulcher

Drive

8.30

Tigercat M726D Mulcher SECTION 9 - BRAKES AND DIFFERENTIAL LOCKS MARCH, 2006

CONTENTS - SECTION 9 AUXILIARY SET-UP CALIPER ............................................................................................ 9.4 BRAKES BRAKE ACCUMULATOR .................................................................................................. 9.2 CIRCUIT DESCRIPTION .................................................................................................. 9.2 CIRCUIT DIAGRAM ......................................................................................................... 9.3 FOOT CONTROL VALVE .................................................................................................. 9.2 DIFFERENTIAL LOCKS CIRCUIT DESCRIPTION .................................................................................................. 9.2 CIRCUIT DIAGRAM ......................................................................................................... 9.3 PARKING BRAKE ............................................................................................................... 9.4 AUXILIARY SET-UP CALIPER ......................................................................................... 9.4 BRAKE CALIPER ASSEMBLY ......................................................................................... 9.6 CALIPER FLOAT ADJUSTMENT ..................................................................................... 9.7 CHECKING FOR PROPER ADJUSTMENT ...................................................................... 9.5 LINING REPLACEMENT .................................................................................................. 9.7 PROXIMITY SENSOR ..................................................................................................... 9.5

Tigercat M726D Mulcher

Brakes and Differential Locks

BRAKE COMPONENTS

BRAKE ACCUMULATOR

For information on bleeding lines, inspecting brake linings and integral parts of the disc brakes, refer to SECTION 8 of THIS MANUAL.

The accumulator is installed to ensure that the brake control remains responsive at all times by maintaining a constant pressure of 1800 psi to the brake foot control valve. The brake accumulator holds sufficient pressure for up to five (5) brake applications after the engine stalls or is shut down. Beyond this, the pressure drops substantially.

To release hydraulic pressure in the brake system, refer to RELEASE PILOT SYSTEM PRESSURE in SECTION 5 of THIS MANUAL. BRAKE PEDAL

For further information about the brake accumulator refer to BRAKE ACCUMULATOR in SECTION 5 of THIS MANUAL.

••

CIRCUIT DESCRIPTIONS 213-20

BRAKE CIRCUIT

BRAKE PEDAL

BRAKE FOOT CONTROL VALVE This pilot valve is a manually operated directional valve and operates on the same principle as a pressure reducing valve.

As the pedal is depressed, pressure from the brake accumulator is sent to the brakes in the rear axle. A reaction piston in the valve senses this increase in brake pressure and relays feedback to the operator, i.e. as brake pressure increases the pedal effort increases proportionately.

For further information on brake accumulator and the accumulator charge valve operation, refer to SECTION 5 of THIS MANUAL. DIFFERENTIAL LOCKS CIRCUIT

A positive stop in the brake valve limits the brake pressure to a preset value. This preset value is determined by the requirements of the brakes in the rear axle, which in this case is 1000 psi. The brake pedal therefore regulates the pressure in the brake lines to 1000 psi maximum.

The differential locks in both the front and rear axles (optional on front axle with a steering wheel) are controlled by switches. The rear differential lock switch is located on the control panel in the cab. The front differential lock switch is located on the left hand (steering) joystick (on instrument panel with a steering wheel). The switches control two solenoid operated pilot valves in ports 'C1' (rear) and 'C5' (front) of the pilot manifold. Placing the front or rear differential lock switch in the ON position energizes the solenoid operated pilot valve which directs pilot oil to the differential lock clutch packs in the corresponding axle to lock the differentials.

Refer also to AXLES-DIFFERENTIAL LOCKS in SECTION 8 of THIS MANUAL.

When the pedal is released, the spool returns to its neutral position and allows the brake cylinders to drain to tank.

T A P

MO-02 MO-01

A fixed displacement pump supplies oil to the accumulator charge valve. This valve directs oil to the brake accumulator through a check valve located between the pilot and brake accumulators. The oil from the brake accumulator side of the check valve is sent to the brake foot control valve to operate the rear axle brakes.

CROSS SECTION OF VALVE BODY

BRAKE FOOT CONTROL VALVE

9.2

Tigercat M726D Mulcher

726M-048

Brakes and Differential Locks

BRAKE AND DIFFERENTIAL LOCK CIRCUITS 9.3

Tigercat M726D Mulcher

Brakes and Differential Locks Pulling up on the parking brake lever engages the brake caliper on the brake disc. A proximity sensor mounted on the side of the parking brake

PARKING BRAKE The parking brake lever is located beside the operator’s seat. It is connected by a cable to a main disc brake caliper assembly mounted on the output side of the transmission.

BRAKE CABLE

••

ADJUST AUXILIARY BRAKE SET-UP CALIPER (ADJUSTING NUT) TO 50 LBF-FT.

• PROXIMITY SENSOR

PARKING BRAKE LEVER

AUXILIARY BRAKE SET-UP CALIPER 336-3AX A second AUXILIARY SET-UP CALIPER is used for hydraulic set-up procedures (on machines equipped with dual motors only) and is not cable operated. When the auxiliary set-up caliper is not being used the adjusting nut should be loose with the jam nut tightened against it. Friction between the brake caliper and the rotating disc can cause a fire. Refer to individual pressure setting procedures throughout this manual for further information on the use of the auxiliary brake setup caliper.

••

•

METAL BAR

••

PARKING BRAKE PROXIMITY SENSOR

337-21

lever is also activated by a metal bar which moves to within 1/8" - 3/16" of the sensor. The proximity sensor activates the drive prevent circuit, to prevent the machine from being driven when the parking brake is ON. Pushing down on the lever releases the brake and de-activates the proximity sensor.

There are two ways to adjust the parking brake to compensate for wear. The first is to use the adjusting knob on the end of the parking brake lever. The second is to adjust the cable clevis at the caliper end of the brake cable.

9.4

Tigercat M726D Mulcher

Brakes and Differential Locks

CHECKING FOR PROPER PARKING BRAKE CABLE ADJUSTMENT

Proximity sensor: A proximity sensor attached to the parking brake has two main functions; When the brake is ON It (1) deactivates the drive prevent circuit to prevent the machine from being driven when the brake is ON and (2) enables the START circuit so that the engine can only be started with the parking brake ON. To drive the machine the parking brake must be OFF, both cab doors closed and the pilot reset button PRESSED.

The parking brake is properly adjusted when Resistance is encountered half way through the brake lever’s travel.

PARKING BRAKE CABLE ADJUSTMENTS Lever end: Turn the knob on the end of the brake lever to increase or decrease braking effect. (Set screw on side of adjusting knob will lock setting) Caliper end: Remove the cotter pin and clevis pin. Loosen the jamnut and thread the clevis on of off the cable to change the cable length. Tighten the jamnut. The jamnut should provide ¼" of preload to the spring.

Replace the clevis pin and cotter pin.

The parking brake proximity sensor should be adjusted so that the distance measured between the end of the sensor and the metal actuating bar of the brake lever is 1/8" with the parking brake in the OFF position. The sensor can be adjusted by loosening the two jamnuts and adjusting the location of the sensor.

The parking brake must be kept properly adjusted at all times and should be lubricated every 500 hours under normal operating conditions.

After making adjustments verify that the sensor will activate the drive prevent circuit when the parking brake is in the OFF position.

Do not allow the sensor and the metal actuating bar make contact with each other.

WARNING All brake adjustments and service must be followed by a test drive using these procedures and then checked for proper caliper "float".

BRAKE CABLE

WASHER (2)

SPRING

CLEVIS NUT (3)

•

COTTER PIN

•

CLEVIS PIN

•

•

•

•

• CALIPER ASSEMBLY

720C-PB5

PARKING BRAKE LEVER

ADJ. NUTS ADJUSTING KNOB

• • •

LOCKING SET SCREW

• •

• DISC

CLEVIS

•

•

•

•

••

TRANSMISSION

METAL BAR

LEVER PARKBRK5

•

PARKING BRAKE ASSEMBLY 9.5

PROXIMITY SENSOR 724D-26

Tigercat M726D Mulcher

Brakes and Differential Locks

REAR CALIPER TORQUE PLATE CARRIER AND LINING ASSEMBLY

CENTER ADJUSTING BOLT

CALIPER MOUNTING NUTS (2)

•

•

• • •

CALIPER MOUNTING BOLTS (2)

•

INNER SEAL (RUBBER)

•

BALL BEARINGS (3)

•

SLEEVES (2)

•

SPRING

•

RUBBER BOOT

•

THRUST WASHER

•

STAINLESS WASHER HARDENED WASHER

• •

•

•

• FRONT CALIPER TORQUE PLATE INNER CAM

•

•

SLEEVE SEAL (2)

RETAINER OUTER CAM

••

OUTER ADJUSTING NUT 720C-PB4

•

LEVER

INNER ADJUSTING NUT

BRAKE CALIPER ASSEMBLY

9.6

Tigercat M726D Mulcher

Brakes and Differential Locks LINING REPLACEMENT 1. Loosen inner and outer locking nuts on the center adjusting bolt just enough to slide each of the caliper torque plates away from the disc and far enough to allow removal of the carrier and lining assemblies. It may be necessary to completely remove one or both nuts from the center adjusting bolt for this procedure.

CALIPER FLOAT ADJUSTMENT 1. Using a feeler gauge, check that a gap (0.010” – 0.060”), referred to as caliper float, exists between the two mounting bolt sleeves and the caliper mounting bracket. There must be a 0.010” to 0.060” caliper float.

If adjustment is required; Loosen the two caliper mounting locknuts (behind the mounting bracket), adjust the two caliper mounting bolts and re-torque the two locking nuts to 100 to 120 lbf-ft, while holding the bolts from turning.

2. Collapse the lining retraction spring (sheet metal spring) and remove it from assembly.

3. Slide both torque plates away from the disc, move the carrier and lining assemblies out of the pockets and remove them from the brake assembly by sliding them sideways.

2. Loosen the two inner and outer locking nuts on the center adjusting bolt.

4. Apply a coating of "anti-seize" to the outside of the two sleeves and slide the torque plates back and forth along the sleeves to ensure that "anti-seize" gets into bores of caliper plates.

3. Rotate the caliper actuating lever to the 5:00 o’clock position (as viewed from the front of the machine looking towards the back). This lever has six possible positions. Lift the lever off of the pins on the back of the outer cam.

Hold the cam from moving and rotate the lever to the desired position and place it back on to the pins on the back of the cam.

5. Install new carrier and lining assemblies into each caliper torque plate.

6. Re-install the retraction spring into the assembly. The feet on the spring must be properly located into the holes in both lining carrier assemblies.

4. Tighten the inner adjustment nut until firm contact is made with the brake disc by the linings. Torque to 100 in-lbs (8 lbf-ft) and then back off 4 to 5 flats. Check that disc is free to rotate.

7. See previous procedure: caliper float adjustment to complete adjustment of new brake linings.

5. Tighten outer locknut against inner adjustment nut to hold this lining clearance adjustment in place (45 to 55 lbf-ft).

CALIPER MOUNTING NUTS

MOUNTING BRKT.

CALIPER "FLOAT"

MOUNTING SLEEVES

REAR TORQUE PLATE

FRONT TORQUE PLATE

CALIPER MOUNTING BOLTS LEVER INNER ADJ. NUT OUTER ADJ. NUT

PARKBRK3

BRAKE CALIPER

9.7

Tigercat M726D Mulcher

Brakes and Differential Locks

9.8

Tigercat M726D Mulcher SECTION 10 - OIL COOLER/RADIATOR AND CROSS-FLOW FAN MARCH, 2006

CONTENTS - SECTION 10 BLINK CODES ................................................................................................................. 10.17 CHARGE AIR COOLER ...................................................................................................... 10.2 CIRCUIT DIAGRAM, CROSS-FLOW FAN ............................................................. 10.14, 10.15 COOLING SYSTEM COOLANT FLOW DIAGRAM ........................................................................................... 10.4 COOLING SYSTEM, ENGINE ........................................... SEE SECTION 7 IN THIS MANUAL CROSS-FLOW FAN CIRCUIT DIAGRAM .............................................................. 10.14, 10.15 CROSS-FLOW FAN WITH ELECTRONIC FAN DRIVE CONTROL ................................... 10.10 ENGINE ACCESS PANELS ............................................................................................. 10.18 ENGINE COOLING SYSTEM ............................................ SEE SECTION 7 IN THIS MANUAL FAN CONTROLLER BLINK CODES .................................................................................

FAN COOLING CIRCUIT DESCRIPTION .........................................................................

FAN DRIVE MOTOR .........................................................................................................

FAN SPEED CHECKS ......................................................................................................

CHECK FOR NO A/C DURING CLEAN MODE ..............................................................

FAN 'CLEAN' SPEED ....................................................................................................

FAN FULL ON SPEED ...................................................................................................

MINIMUM FAN SPEED WITH A/C "ON" ........................................................................

10.17 10.13 10.13 10.16 10.16 10.16 10.16 10.16

HYDRAULIC HAND FILL PUMP ......................................................................................... 10.7 OIL COOLER ...................................................................................................................... 10.2 OIL COOLER AND RADIATOR INSTALLATION .................................................................. 10.3 OIL COOLER CIRCUIT DESCRIPTION .............................................................................. 10.8 PRESSURIZING THE HYDRAULIC TANK .......................................................................... 10.6 PUMP CIRCUIT SCHEMATIC................................................................................... 10.8, 10.9 SCHEMATIC - PUMP CIRCUIT ................................................................................ 10.8, 10.9 VENTING THE HYDRAULIC RESERVOIR .......................................................................... 10.6

Tigercat M726D Mulcher

Oil Cooler/Radiator and Cross-flow Fan

CHARGE AIR COOLER/OIL COOLER/ RADIATOR The charge air cooler, hydraulic oil cooler and engine radiator are mounted on top of each other as an assembly. The assembly is mounted longitudinally in the rear chassis to provide cross flow ventilation.

726D-044

726D-030

RIGHT SIDE - CROSS-FLOW FAN

The fan drive system is reversible to facilitate cleaning by blowing air in the opposite direction through the cooling assembly This cooling assembly must be checked daily for accumulation of debris.

LEFT SIDE - A/C CONDENSER AND COOLER

The complete CAC/oil cooler/radiator/A-C condensor/fan drive assembly is rubber isolation mounted to reduce the transmission of noise and to isolate the components from vibration.

Refer to SECTION 7 for information on the ENGINE COOLING SYSTEM. For detailed cleaning procedures, refer to CLEANING A/C CONDENSER, CHARGE AIR COOLER, OIL COOLER AND RADIATOR in SECTION 2 of the OPERATOR’S MANUAL. 726D-031 CHECK A/C CONDENSER CORE The A/C condenser core is mounted in front of these three units and on hinges to facilitate cleaning. The cooling fan is mounted behind the charge air cooler(CAC)/oil cooler/radiator assembly and draws air from the left side of the machine. The air passes through the CAC/oil cooler/radiator and A/C condensor core and exhausts on the right side of the machine.

10.2

Tigercat M726D Mulcher

CHARGE AIR COOLER

Oil Cooler/Radiator and Cross-flow Fan

FAN SHROUD

A/C CONDENSER (NOT SHOWN)

• FAN FINGER GUARD

••

••

•• SURGE TANK

•

•• FAN MOTOR

RADIATOR

•• OIL COOLER

NOTE: REGULARLY CHECK FOR DEBRIS ACCUMULATION BETWEEN CAC/ RADIATOR/ OIL COOLER AND A/C CONDENSER

726M-064

CHARGE AIR COOLER, OIL COOLER AND RADIATOR INSTALLATION 10.3

Tigercat M726D Mulcher

Oil Cooler/Radiator and Cross-flow Fan

FLOW OF COOLANT WITH ENGINE RUNNING AT OPERATING TEMPERATURE AND THERMOSTAT OPEN

SURGE TANK RADIATOR

•

VENT TUBE THERMOSTST HOUSING WATER PUMP

CHARGE AIR COOLER

RAD CAP

SHUNT HOSE

••

•• ••

•• •

•• • • •• •

• • ENGINE OIL COOLER

DRAIN TAP

TOP RADIATOR HOSE

BOTTOM RADIATOR HOSE HYDRAULIC OIL COOLER

ENGINE COOLING SYSTEM

726M-037A

CHARGE AIR COOLER (CAC)

CROSS-FLOW COOLING FAN

• • INTAKE MANIFOLD

• • TURBOCHARGER

726M-047

CHARGE AIR COOLER: AIR FLOW DURING OPERATION 10.4

Tigercat M726D Mulcher

Oil Cooler/Radiator and Cross-flow Fan

COOLING FAN DRIVE SYSTEM

FAN MOTOR

••

BOOM/FAN/ STEER PUMP

•• ••

726M-069

FAN VALVE

A B

COOLING FAN DRIVE COMPONENTS

10.5

Tigercat M726D Mulcher

Oil Cooler/Radiator and Cross-flow Fan

CAUTION

SET REGULATOR ADJUSTMENT TO OBTAIN 8 PSI MAX READING ON GAUGE

AIR PRESSURE REGULATOR AND GAUGE

PRESSURIZED HYDRAULIC TANK. Before servicing any hydraulic components, vent hydraulic tank. Open drain valve, loosen lock nut on regulator adjustment and turn regulator adjustment out (counter clockwise) to release all air pressure.

150 PSI RELIEF VALVE

•

•

AIR TOOL SUPPLY CONNECTOR

•

DRAIN VALVE

•

•

HYDRAULIC OIL TANK AIR PRESSURE REGULATOR PRESSURIZING THE HYDRAULIC TANK

HYD. OIL TANK

726M-O12

•

When the air tank is drained and the hydraulic tank is vented, the pressure for the hydraulic tank must be reset. Once the compressor has refilled the air tank, turn the adjustment lever on the air regulator to set the air pressure in the hydraulic tank at 8 psi maximum, DO NOT EXCEED 8 psi. Tighten the lock nut on the lever.

SIGHT GAUGE HYD. OIL LEVEL

• SENDING UNIT LOW HYDRAULIC OIL

NOTE: The air breather on the top of the hydraulic tank has a check/relief valve that is set at 10 psi.

•

AIR BREATHER

•

HYDRAULIC TANK 726M-OO5

HYDRAULIC OIL TANK

••

HYDRAULIC OIL TANK

SIGHT GAUGE HYD. OIL LEVEL

Located at the left rear of the machine, the hydraulic tank has a capacity of 50 gallons (189 liters).

A sight gauge, accessible through the rear door indicates the HIGH and LOW levels of the hydraulic oil. Incorporated into this gauge is a low level sending unit which signals a “low hydraulic oil” light in the cab to come ON when the oil level is low. Always keep the hydraulic oil between the ADD and FULL calibrations.

••

A low hydraulic oil level can result in severe damage to pumps.

Over filling causes the excess oil to discharge from the breather vent.

The hydraulic tank is pressurized by the air compressor. A regulator is used to set air pressure to 8 psi.

••

DRAIN PLUG

HYDRAULIC OIL TANK DRAINING/REFILLING THE HYDRAULIC TANK 726M-065

VENTING THE HYDRAULIC TANK Open drain valve, loosen lock nut on regulator adjustment and turn regulator adjustment out (counter clockwise) to release all air pressure.

Replace the oil in the hydraulic tank every 2000 hours of use and Seasonally as recommended in Section 3 of this manual.

Vent the hydraulic tank as outlined in VENTING THE HYDRAULIC TANK.

10.6

Tigercat M726D Mulcher

Oil Cooler/Radiator and Cross-flow Fan

Place a suitable container under the hydraulic tank and remove the drain plug on bottom of tank.

OIL FILL SHUT OFF VALVE

When the tank is drained, reinstall the drain plug and wipe up any spilled oil. Refill the tank using the hand fill pump. Keep the hydraulic oil between the ADD and FULL calibrations.

•

NOTE: When refilling the hydraulic system, vent pumps, motors and valves of air by opening a plug or hose fitting located near or on top of the pumps, motors and valves until oil free of air is seen flowing out of the plug or hose fitting. Failure to vent air from the hydraulic system could cause serious damage to hydraulic components. Tighten plugs or fittings and clean up any spilled oil when completed.

NOTE: Changing strainers, filters and replacing the hydraulic oil tends to aerate the oil. For maximum pump life, the machine should sit for 1 hour after servicing to allow entrained air to escape from the oil prior to applying working pressures to the pumps.

HAND PUMP

•

HAND FILL PUMP

726M-064

HYDRAULIC HAND FILL PUMP The hydraulic hand fill pump, located at the rear of the machine is used for adding oil to the hydraulic oil tank.

NOTE: Check all hydraulic system components especially cooling fan for proper operation after hydraulic oil has been replaced.

To add oil to the tank, vent the tank, clean suction tube and remove cap. Open oil fill shut-off valve, insert end of suction tube into supply drum and operate the pump. The oil is pumped directly into the hydraulic reservoir via a return filter. The pump should always be operated at a medium speed with steady motion. Pumping too fast may cause oil to by-pass oil filter.

IMPORTANT: Close shut-off valve after filling and replace cap on suction tube.

•• CHARGE PRESSURE FILTER

726D-016

10.7

CHARGE PRESSURE FILTER

Tigercat M726D Mulcher

Oil Cooler/Radiator and Cross-flow Fan OIL COOLER CIRCUIT DESCRIPTION Return oil from the attachment circuit is directed to flow to the oil cooler, through the oil cooler to the return filter and back to the hydraulic tank.

Cooling of the oil occurs as air is drawn over the oil cooler cooling fins. Cooled oil then passes through the dual head return filter and into the hydraulic tank.

A 40 psi relief valve, installed in the line between the cooler inlet and outlet, provides a bypass route to allow thick cool oil to bypass the cooler to aid in warming the machine and for oil to flow in the event the oil cooler is plugged.

ATTACHMENT PUMP CIRCUIT SCHEMATIC - SAW HEAD 10.8

726M-028

Tigercat M726D Mulcher

Oil Cooler/Radiator and Cross-flow Fan

•• ••

FLUSHING VALVES TURN IN FULLY THEN BACK OUT 1 1/2 TURNS

726M-027

ATTACHMENT PUMP CIRCUIT SCHEMATIC - MULCHING HEAD 10.9

Tigercat M726D Mulcher

Oil Cooler/Radiator and Cross-flow Fan

FAN DRIVE MOTOR

••

SYSTEM PRESSURE PORT 'A'

726M-044

••

••

SYSTEM PRESSURE PORT 'B'

RIGHT SIDE OF MACHINE

FAN DRIVE

CROSS-FLOW FAN WITH ELECTRONIC FAN DRIVE CONTROL The cross-flow fan is driven by an open loop hydraulic system consisting of a gear pump, a fan drive control valve and a fixed displacement fan drive motor. The cooling fan is mounted behind the charge air cooler/oil cooler/radiator assembly and draws air from the left side of the machine. The air passes through the charge air cooler/oil cooler/ radiator and A/C condensor core and exhausts on the right side of the machine.

The fan drive control valve controls the hydraulic oil flow (speed) and provides a reversing function for the fan drive motor. By reversing the direction of air flow (CLEAN or PURGE) dust and debris are forced out of the charge air cooler/radiator, oil cooler, A/C condenser cores. The fan drive is controlled electronically by the electronic control system.

•• DIAGNOSTIC CONNECTOR

ELECTRONIC CONTROLLER

••

For additional information regarding the operation of the cross flow fan refer to FAN CONTROL and CLEANING A/C CONDENSER AND OIL COOLER/RADIATOR in SECTION 2 of THE OPERATOR'S MANUAL. 726M-008

10.10

ELECTRONIC FAN CONTROLLER WIRING AND DIAGNOSTIC CONNECTOR

Tigercat M726D Mulcher

Oil Cooler/Radiator and Cross-flow Fan

BOOM/FAN/STEER PUMP OUTLET

This is a triple gear pump mounted to the lower left output pad of the pump drive gearbox. The pump drive shaft is connected to the gearbox via a splined adapter.

DRIVEN (IDLER) GEAR

DRIVE GEAR

•

•

INLET

TYPICAL GEAR PUMP

GEAR1

BOOM/FAN/ STEER PUMP

The operation of a typical external gear pump (so called because the gear teeth are on the external surface of the hub) is shown in Figure gear1.

••

A gear pump carries oil from the inlet to the outlet in the spaces between gear teeth. The pumping chamber is formed by the gears, the pump housing, and side plates. One of the two gears is the drive gear and is connected to the drive shaft.

The other idler gear is driven by the drive gear.

726M-070

FAN DRIVE PUMP

The shaft end section of the pump supplies hydraulic oil for the boom and clamp functions.

The center section of the pump supplies oil for the cooling fan drive function. The end section of the pump supplies hydraulic oil for the steering, brake and differential lock functions and oil to the pilot circuit.

CENTER SECTION (FAN)

SHAFT END SECTION (BOOM)

•

726M-071

•

BOOM/FAN/STEER DRIVE PUMP CROSS SECTION 10.11

END SECTION (STEER)

•

AP214

Tigercat M726D Mulcher

Oil Cooler/Radiator and Cross-flow Fan

FAN CONTROL

The temperature sensor in the hydraulic tank operates in a similar manner to the engine coolant temperature sensor but independently and with a different temperature range of (See COOLING SET POINTS).

ELECTRONIC CONTROLLER

••

This sensor will turn the fan ON at (See COOLING SET POINTS). As the temperature of the hydraulic oil increases, the speed of the fan will also increase to a maximum 2200 rpm fan speed @1800 rpm engine speed, at this point the temperature of the hydraulic oil will be (See COOLING SET POINTS), of higher.

•• DIAGNOSTIC CONNECTOR

726M-008

ELECTRONIC FAN CONTROLLER WIRING AND DIAGNOSTIC CONNECTOR

COOLING SET POINTS Charge Air Min Charge Air Max Engine Coolant Min Engine Coolant Max Hydraulic Oil Temp Min Hydraulic Oil Temp Max

When the switch is in the AUTO position and the fan is slowly rotating due to low engine coolant, air intake or hydraulic oil temperatures, turning ON the A/C will immediately turn the cooling fan to run at 1200 rpm. This is to ensure that sufficient air flow is available for the cab A/C even while the machine is still warming up.

720D-052

FAN ELECTRONIC CONTROL MODULE This control consists of an electronic processing module, a three position FAN switch in the operator's cab with CLEAN/AUTO/FULL ON* positions for fan control.

CLEAN (PURGE)

AUTO

CAUTION FULL ON (OVERRIDE)

Before placing the fan switch in the CLEAN (PURGE) position make sure that there are no personnel on the left side of the machine in the area where the fan will expel debris

•• •• • •• •

When the switch is in the FULL ON (OVERRIDE) position, the fan will run at FULL speed for cooling regardless of coolant, air intake or oil temperatures.

The AUTO CLEAN/REVERSE feature will not function in the FULL ON position.

CROSS FLOW FAN SWITCH 720D-049

122°F 183°F 185°F 205°F 120°F 160°F

FAN CONTROL SWITCH

When the engine coolant temperature reaches 185°F the sensor on the engine in conjunction with the electronic control will send a signal to the control valve to start to turn the fan slowly. The fan speed is variable from zero up to a maximum of 2200 rpm fan speed @1800 rpm engine speed. As the temperature of the coolant increases so does the speed of the fan up to the maximum 2200 rpm fan speed @1800 rpm engine speed. At this point the engine coolant temperature will be 205°F, or higher.

When the engine is running and all machine temperatures are below min set points and the A/C is off, the fan will turn at a slow speed.

10.12

When the switch is pressed momentarily to the CLEAN (PURGE) position, the control module will signal the control valve to reverse the flow of oil to the motor and turn the fan in reverse for 10 seconds. The control module will also turn the air conditioning system OFF for as long as the fan switch is in the CLEAN (PURGE) position.

Tigercat M726D Mulcher

Oil Cooler/Radiator and Cross-flow Fan Automatic control of fan speed to match operating conditions can lower fuel consumption and reduce operating costs. In high temperature operating conditions the fan speed is increased to improve cooling ability and efficient operation of the charge air cooler, oil cooler, radiator and air conditioning systems.

In low temperature operating conditions fan speed is reduced, as less cooling is required. This also allows the machine temperatures to reach operating temperature faster.

When the switch is in the AUTO position, the fan will operate at low speed when charge air, engine coolant or hydraulic oil temperatures are low, turning ON the A/C will cause the fan control to immediately turn the cooling fan On. This is to ensure that sufficient air flow is available for the cab A/C even while the machine is still warming up.

FAN DRIVE MOTOR The fan drive motor is a fixed displacement axial piston motor. The fan drive motor is driven by hydraulic flow and pressure from the fan drive pump and in turn directly drives the cross-flow fan.

FULL ON (OVERRIDE) POSITION - When the switch is in the FULL ON (OVERRIDE) position, the fan control system is overridden and the fan will run at FULL speed for cooling regardless of charge air, coolant or oil temperatures. Normally the fan control switch is placed in the AUTO position for optimal cooling. The FULL ON (OVERRIDE) position is intended for use in the event of a temporary failure of the fan control.

FAN COOLING CIRCUIT DESCRIPTION The fan "cooling" circuit is an open loop hydraulic system consisting of a gear pump, a fixed displacement motor and a control valve .

The electronic control module receives signals from the fan switch, engine coolant temperature sensor, engine intake air temperature sensor and hydraulic oil temperature sensor.

NOTE: AUTO REVERSE/CLEANING does not work with fan "FULL ON".

CLEAN POSITION - This is a momentary position of the switch. When the switch is depressed the direction of rotation is reversed for 10 seconds and automatically returns to forward rotation. Reverse rotation is used to clean the charge air cooler, radiator, oil cooler, A/C condenser and air intake door screens. By "reversing" the flow of the fan, air flow is propelled in the opposite direction, thereby forcing dust and debris off of the radiator.

With the fan switch in the AUTO position, the electronic module has full control over the operation of the cooling fan.

This is a three position switch, labelled CLEAN/ AUTO/FULL ON*. This switch along with an electronic fan control module, controls the operation of the hydraulic cross-flow fan.

AUTO POSITION - AUTO is the normal operating position for the fan control switch. When the switch is in the AUTO position, the fan will operate completely in an automatic mode which includes AUTO REVERSE every 15 to 20 minutes for 15 seconds (or what ever cycle time setting has been selected) See Auto Reverse Cycle Time Adjustment later in this section.

The electronic fan control will also turn the A/C system OFF for as long as the fan is in the CLEAN mode. As previously mentioned, rotation is reversed for 10 seconds and automatically returns to forward rotation.

It will start, speed up, slow down or stop all based on the temperature of the charge air, engine coolant and/or the temperature of the hydraulic oil. The electronic fan control module automatically adjusts fan speed to the minimum required level to maintain optimal operating conditions, provide auto reversing and default to fan at full speed if an error in the controller exists.

It is also important to manually clean debris from the machine on a regular basis to maintain low machine operating temperatures. Refer to CLEANING A/C CONDENSER, CHARGE AIR COOLER, OIL COOLER AND RADIATOR in THIS SECTION.

10.13

Tigercat M726D Mulcher

720D-046

Oil Cooler/Radiator and Cross-flow Fan

CROSS-FLOW FAN ELECTRICAL CIRCUIT

10.14

Tigercat M726D Mulcher

Oil Cooler/Radiator and Cross-flow Fan

726M-067

726M-068

CROSS-FLOW FAN HYDRAULIC CIRCUIT 10.15

Tigercat M726D Mulcher

Oil Cooler/Radiator and Cross-flow Fan

FAN SPEED CHECKS

CLEAN (PURGE)

AUTO

FULL ON (OVERRIDE)

MINIMUM FAN SPEED WITH A/C "ON" NOTE: A calibrated "electronic photo tachometer" is required for this procedure.

1.

• • •• •

Park machine on level ground, lower the attachment and stop engine.

CROSS FLOW FAN SWITCH

Ensure that engine coolant and hydraulic oil temperatures are well below the normal operating temperatures of 195°F coolant, 130°F hydraulic oil and 111°F charge air cooler throughout entire test or fan will rotate and test will be invalid.

2.

Place a piece of reflecting tape on the fan hub.

3.

Start the engine.

4.

Set engine speed to 1800 rpm.

5.

Place FAN switch in AUTOMATIC position.

6.

Place A/C switch in ON position.

7.

Use a photo-tachometer to measure the speed of rotation of the fan blade, it should be 1200-1600 rpm.

720D-049

FAN CONTROL SWITCH

7.

With the help of an assistant momentariliy press the fan switch (1) in the CLEAN position and visually check clutch on A/C compressor. It should be disengaged and compressor not running.

8.

When the CLEAN cycle is complete (10 seconds) the fan automatically returns to normal rotation direction and the clutch on the A/C compressor should engage and the compressor should be running.

FAN FULL ON SPEED NOTE: A calibrated "electronic photo tachometer" is required for this procedure.

1.

Park machine on level ground, lower the attachment and stop engine.

2.

Place a piece of reflecting tape on the fan hub.

3.

Start the engine.

Park machine on level ground, lower the attachment and stop engine.

4.

Set engine speed to 1800 rpm.

5.

Place FAN switch in FULL ON position.

2.

Place a piece of reflecting tape on the fan hub.

6.

3.

Start the engine.

Use a photo-tachometer to measure the speed of rotation of the fan blade, it should be 2200 rpm.

4.

Set engine speed to 1800 rpm.

FAN 'CLEAN' SPEED AND CHECK FOR NO A/C DURING CLEAN MODE NOTE: A calibrated "electronic photo tachometer" is required for this procedure.

1.

CAUTION Before placing the fan switch in the CLEAN position make sure that there are no personnel at the rear of the machine in the area where the fan will expel debris 5.

With the help of an assistant momentariliy press the fan switch (1) in the CLEAN position.

6.

Use a photo-tachometer to measure the speed of rotation of the fan blade, it should be 1600-1900 rpm.

10.16

Tigercat M726D Mulcher

Oil Cooler/Radiator and Cross-flow Fan

ELECTRONIC CONTROLLER BLINK CODES

GREEN LED

The Plus 1 electronic controller has two LED lights on the front top left side of the controller. A GREEN LED is used to indicate that power is ON and the controller is activated. The RED LED is used to provide a visual warning in the form of BLINK CODES whenever the controller senses a fault in the system.

RED LED

•••

The following chart can be used for BLINK CODE TRANSLATION AND DIAGNOSTICS. 724E-018

PLUS 1 ELECTRONIC CONTROLLER

700 SERIES Plus 1 BLINK CODE TRANSLATION / DIAGNOSTICS "RED LED" (Flash Bit Sequence)

FAULT CODE 11

•

1 sec

•

••

12

•

1 sec

13

•

1 sec

•••

14

•

1 sec

••••

41

••••

1 sec

•

42

••••

1 sec

••

43

••••

1 sec

•••

44

••••

1 sec

••••

45

••••

1 sec

•••••

46

••••

1 sec

••••••

47

••••

1 sec

•••••••

48

••••

1 sec

••••••••

DESCRIPTION (Fault Location)

EFFECT (Only when fault code is active)

POSSIBLE CAUSE / SOLUTION (To diagnose fault)

Attachment pump displacement control coil Attachment pump will turn off and will not turn on.

Current is out of operating range.

Incorrect Cutter Mode Selected

Mode selector switch is in the incorrect position or the electrical boom connector is not connected. Place mode selector switch in the correct mode or connect boom eletrical connector and turn cutter on

Attachment pump will not turn on.

Saw Blade Overspeed

Attachment pump will turn off and will not turn on.

Speed Sensor Fault

Attachment pump will turn off and will not turn on.

A/C OFF Output Relay is out of operating Range

Fan runs at full speed forward. Fan will not automatically reverse.

720D/724D - Fan will try to continue to perform as normal. If the fault is detected more than 5 times in 10 minutes; fan will attempt to run at full speed forward, not automatically reverse and send SPN 977 FMI 11 Fan Controller Fault to the Engine diagnostic display.

726D/M726D - Fan will try to continue to perform as normal. If the fault is detected more than 5 times in 10 minutes; fan will run at full speed forward, not automatically reverse and send SPN 977 FMI 11 Fan Controller Fault to the Engine diagnostic display.

Fan Forward Coil is out of operating range

Saw blade speed has exceeded the saw max speed set point.

Speed sensor has malfunctioned or blade has not turned for an extended period of time with the cutter on.

Current is out of operating range. Check relay.

Current is out of operating range at the fan forward coil. Check wire connection at the forward coil of fan pump. Check coil ground connections. Ensure ground is common between the coil and the controller.

Current is out of operating range at fan valve coils. Check connections at proportional and directional coils of fan valve. Check ground connections.

Fan Reverse Coil is out of operating range

Fan will try to continue to perform as normal. If the fault is detected more than 3 times in 10 minutes; fan will run at full speed forward, not automatically reverse and send SPN 977 FMI 11 Fan Controller Fault to the Engine diagnostic display.

Current is out of operating range at the fan coils. Check wire connection at the reverse coil of fan pump (720/724D). Check connections at proportional and directional coils of fan valve (726D/M726D). Check ground connections.

Hydraulic Oil Temperature Sender

Fan runs at full speed forward. Fan will not automatically reverse.

Resistance is out of operating range at hydraulic oil temprature sender.

Check wire connections and replace hydraulic oil temperature sender if necessary.

Fan Reverse Frequency Potentiometer

Fan performs normal operation but will be default to automatically reverse every 20 minutes.

Voltage is out of operating range at the reverse frequency potentiometer or it is uncalbirated. To calibrate pot- Turn potentiometer fully out (+), wait 5 secs, then turn potentiometer fully in (-), wait 5 sec. Turn out (+) 1/4 turn to reset automatic reverse frequency.

J1939 CAN BUS Fault

Fan runs at full speed forward. Fan will not automatically reverse.

Engine J1939 not present or Faulted. Check that J1939 backbone is in good condition, all resistors and connectors are properly connected.

Engine Coolant Overheat Condition

Fan runs at full speed forward. Fan will not automatically reverse.

Coolant has reached/exceeded Overheat Set Point. Decrease coolant temp to below overheat set point.

Hydraulic Overheat Condition

Fan runs at full speed forward. No effect on automatic reverse. Hydraulic Oil has reached/exceeded Overheat Set Point. Decrease Engine diagnostic display reads fault code SPN 441 FMI 0 hydraulic oil temp to below overheat set point.

NOTES : 1) To clear fault codes from controller, turn master disconnect switch "off", wait 15 secs, and turn "on". If fault persists see Possible Cause/Solution.

2) If multiple faults are present a 5 second delay will separate the Fault Code Sequences.

"GREEN LED" ON Steady indicates System is Activated/ON

10.17

Tigercat M726D Mulcher

Oil Cooler/Radiator and Cross-flow Fan

CLEANING PROCEDURE: 1.

CAUTION

Shut down as per instructions in OPERATING MACHINE in SECTION 2.

Use compressed air for cleaning only when the machine is cold to avoid the risk of fire caused by debris being blown into contact with hot surfaces.

If using compressed air for cleaning, use at 30 psi or less.

Always use personal protective equipment (eyewear) to guard against flying debris.

Always follow proper engine shutdown procedures.

The important benefits are: •

Extended life of engine, cooling and exhaust systems.

•

Reduced risk of post shutdown fires.

•

Interior of machine cools significantly reducing risks from touching hot surfaces.

R.H. SIDE ACCESS PANELS

4.

HAND KNOB

When the units have been cleaned return all cooling components to their operating position.

CAUTION

•

••

Avoid the risk of fire caused by debris accumulating on surfaces that may become hot during machine operation.

Always use care when cleaning to ensure that debris removed from one area of the machine does not accumulate on other areas of the machine.

•

•

NOTE: The cooling assembly must be checked daily and may have to be thoroughly cleaned on a daily, weekly or monthly basis, depending on operating conditions. Use personal protective equipment (eyewear) to guard against flying debris. Use compressed air for cleaning only when the machine is cold to avoid the risk of fire caused by debris contacting hot surfaces. Care must be taken not to set the pressure too high otherwise damage to the components could result.

R.H. ENGINE ACCESS PANELS

726-002

HAND KNOB

L.H. SIDE ACCESS PANELS

•

•

• •

Pay particular attention to cleaning in the corners of the cooler as these areas usually plug deeply.

Reversing the fan at least once per hour will help reduce the dust accumulation in the cooler cores.

726-001

2.

L.H. ENGINE ACCESS PANELS

Open the right and left side access panels.

3. Remove two nuts and carefully swing open the A/C condenser (on hinges) to expose oil cooler/radiator/CAC cooling assembly. Remove any accumulated debris from between A/C / condenser and oil cooler/radiator/CAC cooling assembly.

10.18

Avoid the risk of fire caused by debris accumulating on surfaces that may become hot during machine operation. Always use care when cleaning to ensure that debris removed from one area of the machine does not accumulate on other areas of the machine. For more information on fire prevention refer to FIRE PREVENTION in SECTION 1 of THIS MANUAL. If an oil leak occurs in this area it should be thoroughly power-washed with a mild soap to ensure that all of the oil is removed. The presence of oil causes dust and dirt to cling to surfaces which will impair the reversible fan's ability to remove dust and dirt particles.

Tigercat M726D Mulcher SECTION 11- STEERING AND CENTER JOINT MARCH, 2006

CONTENTS - SECTION 11 CENTER JOINT ADJUSTMENT ............................................................. 11.10 CHECKING .................................................................. 11.10 DIAGRAM .................................................................... 11.11 GREASE SEALS ......................................................... 11.11 LUBRICATION .............................................................. 11.10 MAINTENANCE ........................................................... 11.10 CIRCUIT DESCRIPTION ................................................. 11.6 CIRCUIT DIAGRAM ......................................................... 11.7 JOYSTICK CONTROL VALVE ......................................... 11.5 PRESSURE SETTINGS .................................................. 11.8 SAFETY .......................................................................... 11.8 STEER RELIEF VALVE ................................................... 11.4 STEER VALVE ................................................................ 11.4 CROSS SECTION ........................................................ 11.4 DESCRIPTION ............................................................. 11.4 OPERATING DESCRIPTION ........................................ 11.4

Tigercat M726D Mulcher BOOM/FAN/STEER PUMP

Steering and Center Joint OUTLET

This is a triple gear pump mounted to the lower left output pad of the pump drive gearbox. The pump drive shaft is connected to the gearbox via a splined adapter.

DRIVEN (IDLER) GEAR

DRIVE GEAR

•

•

INLET

TYPICAL GEAR PUMP

GEAR1

BOOM/FAN/ STEER PUMP

The operation of a typical external gear pump (so called because the gear teeth are on the external surface of the hub) is shown in Figure gear1.

•

A gear pump carries oil from the inlet to the outlet in the spaces between gear teeth. The pumping chamber is formed by the gears, the pump housing, and side plates. One of the two gears is the drive gear and is connected to the drive shaft.

The other idler gear is driven by the drive gear.

726M-070

BOOM/FAN/STEER PUMP The shaft end section of the pump supplies hydraulic oil for the boom and clamp functions.

The center section of the pump supplies oil for the cooling fan drive function. The end section of the pump supplies hydraulic oil for the steering, brake and differential lock functions and oil to the pilot circuit.

CENTER SECTION (FAN)

SHAFT END SECTION (BOOM)

••

726M-071

••

BOOM/FAN/STEER DRIVE PUMP CROSS SECTION 11.2

END SECTION (STEER)

•

AP214

Tigercat M726D Mulcher STEER RELIEF VALVE

Steering and Center Joint

The steer relief valve is located between the steer pump and the steer valve. The steer relief valve protects the steer pump and steer circuit from over pressurizing. Relief oil is directed back to tank via a return filter.

The relief valve is adjusted by loosening the locknut and turning the hex head screw. Turning the hex head screw clockwise increases the STEER RELIEF (2500 PSI) - 1/2" WRENCH - 9/16" WRENCH

•• ••

TEST PORT

••

ADJUSTING SCREW

LOCKNUT

• TANK

PRESSURE 726M-065

STEER RELIEF VALVE

RELIEF CARTRIDGE

pressure setting and counter-clockwise decreases the pressure setting. Once the pressure is set correctly, tighten the locknut and re-check the pressure setting. A gauge test port is provided at the relief valve.

11.3

RPGC

Tigercat M726D Mulcher STEER VALVE

Steering and Center Joint

The steer valve is a control valve which consists of an open center spool section, an inlet section and an outlet section. Cartridge type relief valves are installed in both work ports of the spool section.

Shifting the spool directs oil from the steer pump to the steer cylinders.

The port relief valves in the steer valve also function as anti-cavitation relief valve. The return oil from the port relief valves is diverted back to tank via the tank passage in the spool section and the outlet section.

OPERATING DESCRIPTION Oil from the boom/steer pump (via the accumulator charge valve) enters the inlet section of the steer valve, passes through the open center spool section and back to tank via the outlet section.

For a detailed description of port relief valves, refer to RELIEF VALVES in SECTION 18 of THIS MANUAL.

The open center spool has three positions. A spring in the spool end cap holds the spool in the center neutral position. The spool is shifted one way or the other by pilot pressure applied to either end of the spool.

RELIEF VALVE PORT 'A'

PARALLEL PASSAGE

WORK PORT BRIDGE

A

LOAD CHECK VALVE

RELIEF VALVE PORT 'B'

B

SPOOL SPOOL CENTERING SPRING TANK PASSAGE

90136-3

THRU' NEUTRAL PASSAGE

STEERING VALVE CROSS SECTION

11.4

Tigercat M726D Mulcher JOYSTICK CONTROL VALVE

Steering and Center Joint OPERATING DESCRIPTION

This pilot valve is a manually operated directional control valve and operates on the same principle as a direct operating pressure reducing valve.

Operated by hand this valve directs pilot pressure to the steer control valve pilot end caps. The valve spool then shifts from its centre position and directs pump flow to operate the corresponding cylinder.

In the neutral position the joystick lever is held centered by return spring (4).

When the lever (1) is operated, the plunger (5) is pushed against the return spring (4).

At the same time the regulating spool (2) is moved through the regulating spring (3).

When the regulating stroke begins, there is a connection from port 'P' via hole (8) in the spool and work port 2 or 4 in the base of the valve, to the steer valve pilot end caps.

Pressure provided by the steer/boom pump via the pilot manifold at ports 2 and 4 of the joystick valve is directly proportional to the operator position of the joystick and the regulating spring characteristic. Moving the joystick to the right will steer the machine to the right and moving the joystick to the left will steer the machine to the left.

The steering joystick cannot move forward or back due to stops installed in these plunger ports.

RR-12

JOYSTICK PILOT VALVE

•

•

5

• •

4 3

• •

•

2

•

1

•

'P' PORT WORK PORTS 2 OR 4

AU013-2

SPOOL ARRANGEMENT

AU013-1

11.5

Tigercat M726D Mulcher STEER CIRCUIT DESCRIPTION

Steering and Center Joint

Two steer cylinders are used to steer the machine. Operating oil is supplied from the fixed displacement boom/steer pump, via steer relief valve and the accumulator charge valve, to the steer valve. The steer valve controls the flow of oil to and from the steering cylinders. The steering joystick supplies pilot oil to shift the spool in the steer valve.

Moving the joystick to the LEFT directs pilot oil to the "A" port pilot end cap of the steer control valve, this shifts the spool in the control valve and allows oil to flow from the steer pump (via the accumulator charge valve) to the two steer cylinders and steer the machine LEFT. Moving the joystick to the RIGHT directs pilot oil to the "B" port pilot end cap of the steer valve and steers the machine RIGHT. Return oil from the cylinders flows back to the steer valve and is directed back to tank through the outlet section of the steer valve.

The steering "speed" is controlled by the amount the joystick is moved to the right or left. A small movement of the joystick will turn the machine slowly and a large movement of the joystick will turn the machine very rapidly. Relief valves are installed on both ports of the steer valve to prevent over pressurizing of the steer cylinders when the control spool is in the center position.

The steer relief valve is the steer circuit main relief valve. It is set lower than the steer valve port reliefs and is installed in the line between the boom/steer pump and the accumulator charge valve. This protects the system by preventing system pressure from rising above the preset value. Higher system pressures will cause the steer relief valve to direct oil back to tank.

NOTE: Hydraulic lines to the steer cylinders must be cross connected to allow the machine to steer while being towed by another vehicle. For complete towing information, refer to TOWING INSTRUCTIONS in SECTION 2 of the OPERATOR'S MANUAL.

11.6

Tigercat M726D Mulcher

726M-073

Steering and Center Joint

STEER CIRCUIT DIAGRAM 11.7

Tigercat M726D Mulcher STEERING PRESSURE SETTINGS

Steering and Center Joint 1. Park the machine on level ground, lower the felling head to the ground and set the parking brake ON. Install articulation lock bar, block wheels and stop engine.

NOTE: Refer to RELIEF VALVE ADJUSTING PROCEDURE in SECTION 18 of THIS MANUAL. Before starting this procedure, read the following safety precautions:~

WARNING

• Wear safety glasses and safety shoes when working on or around machine.

To prevent injury caused by accidental steering of the machine when setting pressures, make sure the articulation lock bar is held securely in place by the lynch pins provided.

• Never stand in the articulating zone of the machine during set-up. Always stand on the side opposite to the direction in which the machine is being steered.

• Be aware of machine pinch points that could cause injury. Never place body parts within the range of motion of moving parts.

2. Install a 0-5000 psi pressure gauge to the steer relief valve gauge test port .

3. Turn the steer relief valve adjusting screw all the way in and then back out two turns.

• Be sure to use lynch pins when installing articulation lock bar. Vibration and the motion of steering could work retaining pins upward.

4. Turn both steer valve port relief adjusting screws on steer valve out until spring pressure is relieved.

REAR CHASSIS FRONT CHASSIS

•

•

RETAINING PIN

• • LYNCH PIN

LOCK BAR

• 726D-039

LOCK BAR IN LOCKED POSITION

11.8

Tigercat M726D Mulcher

Steering and Center Joint

5. Start the engine and set the throttle control to IDLE. 6. Ensure that the hydraulic oil temperature is between 120°F - 140°F.

IMPORTANT Avoid blowing oil over relief longer than 5 seconds, as excessive heating of hydraulic fluid and damage to boom/steer pump can occur.

7. While attempting to steer the machine to the RIGHT, set the port 'B' relief on the steer valve to 3200 psi.

PORT 'B' RELIEF

PORT 'A' RELIEF

A B

LEFT

RIGHT

STEER VALVE

AT055

8. While attempting to steer the machine to the LEFT, set the port 'A' relief to 3200 psi.

9. Turn steer relief valve all the way out.

STEER RELIEF (2500 PSI) - 1/2" WRENCH - 9/16" WRENCH

• ••

TEST PORT

•

ADJUSTING SCREW

LOCKNUT

•• TANK

PRESSURE 726M-065

STEER RELIEF VALVE

RELIEF CARTRIDGE

10. Move the throttle control to the FULL position.

11. While attempting to STEER the machine either RIGHT or LEFT, set the steer relief valve pressure to 2500 psi.

12. Remove pressure gauge and wipe up any excess oil in test port area.

13. Remove the articulation lock bar and place it in the storage position.

11.9

RPGC

Tigercat M726D Mulcher

Steering and Center Joint

CENTER JOINT MAINTENANCE OF CENTER JOINT Maintenance in this area is usually limited to: a) Regular lubrication of the two center joint grease fittings (items 11) to purge the pivot bearings of debris and water. Refer to SCHEDULED MAINTENANCE in SECTION 3 of THIS MANUAL for lubrication intervals.

Use only high quality, lithium based EP2 grease containing molybdenum disulphide.

4. Partially depress the plunger end of the dial indicator against the bottom surface of the front chassis upper lug 'B' as close to center pin as possible. Zero the dial indicator.

5. Fully loosen only the 6 bottom pin retainer bolts (item 2) that were torqued in step 2.

DIAL INDICATOR PLUNGER

B

•• ••

b) Visually checking the center joint pivot for looseness every 1000 hours. With an observer on the ground, keeping well clear of the center joint area, perform the following test to check for looseness of center joint.

REAR CHASSIS

DIAL INDICATOR FRONT CHASSIS

1. Have operator lift the felling head off the ground and then rapidly raise and lower head several times to "bounce" machine.

DIAL INDICATOR BASE

2. As machine bounces, check for motion between the front and rear chassis frame lugs. Also check for a "clunking" sound at the center joint area.

267-17

• A

CHECK PRELOAD

6. The dial indicator should now show a change of 0.008" to 0.012" between lug 'A' and 'B'.

This is the proper bearing preload setting.

FRONT CHASSIS

CHECK FOR MOVEMENT IN THIS JOINT AREA

267-8

A change of less than 0.008" indicates that the bearing preload is too low. No change on the dial indicator is the result of a loose center joint. In these cases, proceed to CENTER JOINT PRELOAD ADJUSTMENT.

REAR CHASSIS

1000 HOUR CHECK

3. Movement between front and rear chassis lugs or clunking of the pivot indicates a loose joint and preload must be checked.

CHECKING THE CENTER JOINT PRELOAD 1. Park the machine on level ground. Set parking brake ON and shut off engine.

CENTER JOINT PRELOAD ADJUSTMENT Before making any adjustments to the center joint, please follow CHECKING THE CENTER JOINT BEARING procedure in THIS SECTION. With dial indicator still in place; 7. Remove all bottom pin retainer bolts (item 2), the bottom pin retainer plate (item 3) and all of the shims in the shim pack (items 10).

CAUTION: Keep upward pressure on the bottom pin (item 9) and do not allow pin to fall out from bearing. These pivot pins are very heavy, block the pin in place if necessary.

2. Torque the 6 top and 6 bottom retainer bolts (items 1 and 2) to 282 - 310 lbf-ft.

3. Place the magnetic base of a dial indicator on the top surface of the front chassis lower lug 'A' as close to the center pin as possible.

8. Remove the thinnest shim from the pack.

9. Reinstall the remaining shims, the retainer plate and the bolts. Leave the bolts loose.

10. Zero the dial indicator again and torque the 6 bottom bolts in sequence to 282 - 310 lbf-ft.

11.10

Tigercat M726D Mulcher

Steering and Center Joint

11. A change of 0.008" to 0.012" should register on the dial indicator.

ORIENTATION OF GREASE SEALS The pivot bearings (item 4) are sealed on both sides by grease seals (items 5 and 6). These seals have proven to have a long life.

This is the proper bearing preload setting. a) If change in dial indicator reading is greater than 0.012", the shim removed (in step 8) was not thin enough. Obtain a thinner shim and put it back into the shim pack (item 10).

If replacement becomes necessary, new seals must be installed in the proper orientation. Refer to the center joint diagram and follow these guidelines for correct installation;

b) If the change in the dial indicator reading is less than 0.008", another shim will have to be removed. Repeat steps 7 through 11, removing additional shims but only the thinnest shim each time, until the change in the reading on dial indicator is within the proper range. c) It is possible that the total thickness of two shims is too great and a single shim, of lesser thickness than these two, must be removed.

•

The two seals installed on either side of the top bearing must be installed with the seal garter spring facing UP.

•

The two seals installed on either side of the bottom bearing must be installed with the seal garter spring facing DOWN.

Apply Loctite (blue - removable) or equivalent and torque the six bolts (item 7) for the bearing retainer plate (item 8) to 80 - 88 lbf-ft.

TORQUE TO 282 - 310 LBF-FT. 1 NO LOCTITE REQUIRED

•

GREASE SEALS WITH SPRINGS FACING UPWARD

REAR CHASSIS • •

FRONT CHASSIS

11

•

9

• • •

• 6

• • • • CENTER JOINT 11.11

3

2

TORQUE TO 282 - 310 LBF-FT. NO LOCTITE REQUIRED

5

•

GREASE SEALS WITH SPRINGS FACING DOWN 726M-074

4

10

8 7 TORQUE TO 80 - 88 LBF-FT. USE LOCTITE (REMOVABLE)

Tigercat M726D Mulcher

Steering and Center Joint

11.12

Tigercat M726D Mulcher SECTION 12 - LIFT BOOM MARCH, 2006

CONTENTS - SECTION 12 BOOM LIFT LOCK .................................................................................................................... 12.6 BOOM VALVE ASSEMBLY PROCEDURE ................................................................................................... 12.10 CROSS SECTION OF SPOOL SECTION .............................................................................. 12.3 OPERATING DESCRIPTION .................................................................................................. 12.2 RELIEF VALVES .................................................................................................................... 12.8 CIRCUIT DESCRIPTION ........................................................................................................... 12.4 CIRCUIT DIAGRAM ................................................................................................................... 12.5 JOYSTICK CONTROL VALVE ................................................................................................... 12.2 OPERATING DESCRIPTION .................................................................................................. 12.2 PRESSURE SETTINGS ............................................................................................................ 12.6 PUMP, DESCRIPTION BOOM/STEER PUMP ................................................................. SEE SECTION 11 - STEERING RELIEF VALVES ADJUSTING PROCEDURE .................................................................................................... 12.9 OPERATION .......................................................................................................................... 12.8

Tigercat M726D Mulcher BOOM JOYSTICK VALVE

Lift boom OPERATING DESCRIPTION

The boom joystick pilot valve is a manually operated directional control valve and operates on the same principle as a direct operating pressure reducing valve. Operated by hand, this valve directs pilot pressure to the boom valve pilot end caps. The corresponding spool valve then shifts from its centre position and directs pump flow to operate the corresponding cylinder.

In the neutral position, the joystick lever is held centered by return spring (4).

When the lever (1) is operated, the plunger (5) is pushed against the return spring (4).

At the same time, the regulating spool (2) is moved through the regulating spring (3).

When the regulating stroke begins, there is a connection from port 'P' via the hole (8) in the spool and work ports 1, 2, 3 or 4 in the base of the valve, to the boom valve pilot end caps.

Pressure provided by the steer/boom pump via the pilot manifold at ports 1, 2, 3 and 4 of the joystick valve is directly proportional to the operator position of the joystick and the regulating spring characteristic.

BOOM VALVE The boom valve consists of four open center spool sections and one inlet section. Each spool section is pilot operated. An outlet section directs return oil back to tank. The control valve is located on the front chassis above the front axle and behind the cover plate.

OPERATING DESCRIPTION

JOYSTICK PILOT VALVE

RR-12

•

5

• •

4

•

'P' PORT

AUO13-2

Oil enters the inlet section and is allowed to pass through the four spool sections and back to tank via the outlet section. Each of these spool sections has a self centering 3-position spool which is open centered. A spring in the spool end cap holds the spool in the center neutral position.

The spool is shifted by pilot pressure being applied to either end of the spool. Shifting the spool directs oil to operate any one of the four functions (or all at the same time if required but with reduced flow to each).

3 2

•

1

•

To prevent over pressurizing of the operating circuits, each work port in the valve sections has a port relief valve.

• •

A main relief valve is installed in the inlet section of the valve. The inlet main relief valve controls the lift spool section and is set lower than the lift up port relief valve. All relief valves are the same type (anti-cavitation relief valve). For a detailed description of these relief valves, refer to RELIEF VALVES in THIS SECTION.

•

WORK PORTS 1, 2, 3 OR 4

SPOOL ARRANGEMENT

12.2

Tigercat M726D Mulcher

Lift boom

LIFT 'DOWN' PORT RELIEF (2200 PSI)

LIFT 'UP' PORT RELIEF (2900 PSI)

•

•

LIFT

GAUGE TEST PORT

•

•

MAIN RELIEF (2600 PSI)

•

INLET SECTION

BOOM CONTROL VALVE WITH SAW

726M-076

RELIEF VALVE PORT 'A'

PARALLEL PASSAGE

LOAD CHECK VALVE

A

WORK PORT BRIDGE

RELIEF VALVE PORT 'B'

B

PILOT END CAP PILOT END CAP

90136-3

SPOOL CENTERING SPRING

SPOOL TANK PASSAGE

THRU' NEUTRAL PASSAGE

CROSS SECTION OF SPOOL SECTIONS

12.3

Tigercat M726D Mulcher BOOM CIRCUIT DESCRIPTION

Lift boom

The boom valve in use will vary depending on whether a saw attachment or bunching shear is being used. Which ever valve is used, the following circuit description and pressure setting procedures will apply for both.

Two cylinders are used to raise and lower the felling head. The boom cylinders receive oil from a fixed displacement pump via the LIFT spool section in the boom valve. The lift spool section in the boom valve is pilot operated at both ends.

Pilot oil from the boom (right hand) joystick control valve in the operator's cab shifts the spool. The spool directs oil from the pump to either end of the cylinders and from the cylinders back to tank via the oil cooler and primary return double filter.

12.4

Tigercat M726D Mulcher

726M-075

Lift boom

LIFT BOOM CIRCUIT 12.5

Tigercat M726D Mulcher PRESSURE SETTINGS

Lift boom WARNING

NOTE: Refer to RELIEF VALVE ADJUSTING PROCEDURE in this section.

Do not stand above or below the felling head and lift boom or between the boom and front chassis during this procedure.

Before starting this procedure, read the following safety precautions:~ • Never reach between boom crank arms or link arms during machine set-up.

4. Turn the boom mid inlet main relief adjusting screw all the way IN.

• Wear safety glasses and safety shoes when working on shears.

5. Turn both lift spool section port relief valve adjusting screws OUT until spring pressure is relieved then turn adjusting screws one full turn IN.

• Do not stand on top or inside of boom arms.

1. Park machine on level ground. Completely raise lift boom. Set parking brake ON. Install articulation lock bar, block wheels and stop engine.

6. Start the engine, and set the throttle control to the IDLE position.

IMPORTANT During the following procedures, DO NOT hold ANY function control for LONGER THAN 5 SECONDS.

WARNING To prevent injury caused by accidental steering of the machine when setting pressures, make sure the articulation lock bar is held securely in place by the lynch pins provided.

7. Ensure that the hydraulic oil temperature is between 120°F - 140°F. 8. While holding the joystick in the LIFT UP position (fully extended), check gauge pressure reading.

2. Completely raise lift boom and install lift boom cylinder lock over one of the two cylinder rods with the open side at the bottom and wide end up against the keeper plate bolt heads. Install retaining bolt and locknut through center hole. Slowly lower boom until lock is securely held in place.

If less than 2900 psi, lower boom to rest against lock, stop engine and readjust LIFT UP port relief. Repeat above procedure until a gauge reading of 2900 psi is obtained.

IMPORTANT Approach the gauge reading slowly and deliberately by turning the adjusting screw in a little at a time. The pressure setting must not exceed the above value.

WARNING

Always install boom lift lock before working on or around machine with boom raised.

• Always install 'T' handle retainer bolt • Use only to support boom and cutting head • Do not use to set hydraulics pressures 3. Connect a 0 - 5000 psi pressure gauge (with at least 4' of hose) to the boom control valve mid inlet test port.

12.6

Tigercat M726D Mulcher

Lift boom

9. Remove lift boom cylinder lock. It is not designed to withstand high forces created by the hydraulic system. Never use this cylinder lock to set boom down port relief.

10. While holding the joystick in the LIFT DOWN position (fully retracted), check gauge pressure reading. Front wheels may lift off ground.

If less than 2200 psi, release pressure in rod end of lift cylinders and allow felling head to sit on the ground. Stop engine and readjust LIFT DOWN port relief. Repeat above procedure until a gauge reading of 2200 psi is obtained.

11. Stop engine, unscrew mid inlet main relief adjusting screw three(3) full turns.

12. Start engine and move the throttle control to the FULL position.

IMPORTANT Never run engine at full throttle with main relief turned all the way in.

13. While holding the joystick in the LIFT UP position (fully extended), check gauge pressure reading.

If less than 2600 psi, release pressure in base end of lift cylinders and allow felling head to sit on the ground. Stop engine and readjust the mid inlet main relief. Repeat above procedure until a gauge reading of 2600 psi is obtained.

14. Remove pressure gauge and wipe up any excess oil from test port area.

12.7

Tigercat M726D Mulcher

Lift boom ANTI-CAVITATION RELIEF VALVE

VALVE POPPET

This valve is used as a MAIN and PORT relief valve in the saw, clamp arm, and accumulating arm control valves.

T P

Operation Step 1.

T

STEP 1 PILOT POPPET

‘P’ represents a high pressure area and ‘T’ represents tank. Under normal operation, ‘P’ is below the relief pressures, the valve poppet is firmly seated and oil cannot flow to tank.

T

Step 2.

P

STEP 2

When the pressure at ‘P’ reaches the relief valve setting, the pilot poppet unseats and allows oil in the inner cavity to flow to tank, thus lowering the pressure in the cavity between the pilot poppet and the other poppets.

T SEATING POPPET

Step 3.

T

As a result of the opening of the pilot poppet, the seating poppet moves back, due to the pressure drop caused by oil flow through the bore of the seating poppet, and seats against the pilot poppet.

This shuts off the flow of oil through the seating poppet and the cavity pressure now drops to tank pressure.

P

STEP 3

T

Step 4.

VALVE POPPET

T

As the seating poppet began to move away from the valve poppet, the valve poppet began to open under the effect of the pressure at P thus allowing a large volume of flow to tank. The drop in pressure behind the valve poppet when the seating poppet seats on the pilot poppet ensures full opening of the valve poppet.

P

STEP 4

T

Step 5.

When pressure ‘P’ drops the pilot poppet closes and then the seating poppet moves back to its original position and permits oil pressure to flow into the cavity behind the valve poppet. As the seating poppet moves back it comes in contact with the valve poppet and its spring force plus the oil pressure cause the valve poppet to move back to the closed position.

T

VALVE POPPET

P

STEP 5

T CHECK POPPET

As an anti-void or check valve.

The anti-void unit supplies oil to the pressure area ‘P’ when its pressure drops below the pressure in the tank gallery of the valve. The valve then acts as a free flow check valve and prevents cavitation. In this condition, the pressure at ‘P’ is lower than at ‘T’ and due to the shape of the check poppet, the pressure forces cause the poppet to unseat, allowing oil to flow from ‘T’ to ‘P’.

T P

ANTI-VOID CHECK OPERATION

T 12.8

Tigercat M726D Mulcher

Lift boom

ANTI-CAVITATION RELIEF VALVE ADJUSTING PROCEDURE For relief valve with adjusting nut ADJUSTING NUT

•

JAMNUT

•

RELIEF VALVE 51055-2

WITH ADJUSTING NUT

1.

Loosen jamnut.

2.

Turn adjusting nut to obtain desired pressure reading on gauge.

3.

Lock jamnut against adjusting nut, making sure the adjusting nut does not turn.

5.

Re-check relief setting.

12.9

Tigercat M726D Mulcher BOOM VALVE ASSEMBLY PROCEDURE

Lift boom

4. Position end section on last spool section as shown and hand tighten tie rod nuts.

1. Lay out valve components on a clean, flat working surface. The inlet assembly will include an "O" ring, a load check poppet and a load check spring. Tools required for basic valve assembly include a 3/4" and 11/16" wrench and a torque wrench with thin wall sockets.

5. Position valve assembly with the mounting pads of the end sections on a flat surface. To obtain proper alignment of end sections relative to the spool sections, apply downward pressure to the end sections and snug the tie rod nuts to 10 lbf-ft.

Torque the two 11/16" nuts at 45-50 lbf-ft.

2. Assemble tie rod nuts to one end of each tie rod with one or two threads showing. Insert tie rods through rod holes in inlet section (larger diameter rod at top). Lay inlet section on end with tie rods up. Place the "O" ring in position within the groove.

Torque the 3/4" nut at 70-80 lbf-ft.

6. Install auxiliary valves and plugs and torque to proper values.

3. Place first spool section ("O" ring side facing up) on the inlet section. Position "O" ring in to groove and insert load check poppet (nose down) and spring (behind poppet) into load check cavity as shown. Repeat this procedure for each spool section. The load check springs are compressed by the following sections during assembly.

12.10

Tigercat M726D Mulcher SECTION 13 - TILT MARCH, 2006

CONTENTS - SECTION 13 BOOM LIFT LOCK ................................................................................................. 13.5 BOOM VALVE DIAGRAM ....................................................................................... 13.2 CIRCUIT DESCRIPTION ........................................................................................ 13.2 CIRCUIT DIAGRAM ................................................................................................ 13.3 CONTROL VALVES ................................................................................................ 13.2 PRESSURE SETTINGS ......................................................................................... 13.4 RELIEF VALVES ADJUSTING PROCEDURE ................................................................................. 13.5

Tigercat M726D Mulcher

Tilt

TILT 'OUT' PORT RELIEF (2900 psi) TILT 'IN' PORT RELIEF (2900 psi)

•

•

GAUGE TEST PORT

•

•

•

NLET SECTION

MAIN RELIEF (2600 psi)

BOOM VALVE

CONTROL VALVES

TILT CIRCUIT DESCRIPTION

For a complete description of the boom valve, refer to BOOM VALVE in SECTION 12 of THIS MANUAL.

The boom valve in use will vary depending on whether a saw attachment or bunching shear is being used. Which ever valve is used, the following circuit description and pressure setting procedures will apply for both.

For a complete description of the boom joystick pilot valve, refer to JOYSTICK CONTROL VALVE in SECTION 12 of THIS MANUAL.

The boom valve is located on the front chassis above the front axle, behind the cover plate.

Two cylinders are used to tilt the felling head forward and back. The cylinders receive oil from the fixed displacement boom/steer pump via the TILT spool section in the boom control valve. The tilt spool section in this control valve is pilot operated at both ends. It receives pilot oil from the boom joystick control valve in the operator's cab to shift the spool. The spool directs oil from the pump to either end of the cylinders and from the cylinders back to tank via the oil cooler and primary return double filter.

13.2

Tigercat M726D Mulcher

724D-10

Tilt

TILT CIRCUIT 13.3

Tigercat M726D Mulcher PRESSURE SETTINGS

Tilt 4. Turn the boom mid inlet main relief adjusting screw all the way IN.

NOTE: Refer to RELIEF VALVE ADJUSTING PROCEDURE in THIS SECTION.

5. Turn both tilt spool section port relief valve adjusting screws OUT until spring pressure is relieved then turn adjusting screws one full turn IN.

Before starting this procedure, read the following safety precautions:~

6. Start the engine, and put the throttle control to the IDLE position.

• Never reach between boom crank arms or link arms during machine set-up.

7. Ensure that the hydraulic oil temperature is between 120°F - 140°F.

• Wear safety glasses and safety shoes when working on shears.

8. While holding the joystick in the TILT OUT position (fully extended), check gauge pressure reading.

• Do not stand on top or inside of boom arms.

If less than 2900 psi, lower felling head to the ground, stop engine and readjust TILT OUT port relief. Repeat above procedure until a gauge reading of 2900 psi is obtained.

1. Park machine on level ground. Completely raise lift boom. Set parking brake ON. Install articulation lock bar, block wheels and stop engine.

IMPORTANT WARNING

During the following procedures, DO NOT hold ANY function control for LONGER THAN 5 SECONDS.

To prevent injury caused by accidental steering of the machine when setting pressures, make sure the articulation lock bar is held securely in place by the lynch pins provided.

9. While holding the joystick in the TILT IN position (fully retracted), check gauge pressure reading.

If less than 2900 psi, lower felling head to the ground. Stop engine and readjust TILT IN port relief. Repeat above procedure until a gauge reading of 2900 psi is obtained.

2. Completely raise lift boom and install lift boom cylinder lock over one of the two cylinder rods with the open side at the bottom and wide end up against the keeper plate bolt heads. Install retaining bolt and locknut through center hole.

Slowly lower boom until lock is securely held in place.

IMPORTANT Approach the gauge reading slowly and deliberately by turning the adjusting screw in a little at a time. The pressure setting must not exceed the above value.

WARNING

10. Stop engine, unscrew mid inlet main relief adjusting screw 3 full turns.

11. Start engine and move the throttle control to the FULL position.

Always install boom lift lock before working on or around machine with boom raised.

• Always install 'T' handle retainer bolt • Use only to support boom and cutting head

IMPORTANT Never run engine at full throttle with main relief turned all the way in.

3. Connect a 0 - 5000 psi pressure gauge (with at least 4' of hose) to the mid inlet test port.

12. While holding the joystick in the TILT IN position, check gauge pressure reading.

If less than 2600 psi, lower felling head to the ground. Stop engine and readjust the mid inlet main relief. Repeat above procedure until a gauge reading of 2600 psi is obtained.

WARNING Do not stand above or below the felling head and lift boom or between the boom and front chassis during this procedure.

13. Remove pressure gauge and wipe up any excess oil from test port area.

13.4

Tigercat M726D Mulcher

Tilt

ANTI-CAVITATION RELIEF VALVE ADJUSTING PROCEDURE For relief valve with adjusting nut ADJUSTING NUT

•

JAMNUT

•

RELIEF VALVE 51055-2

WITH ADJUSTING NUT

1.

Loosen jamnut.

2.

Turn adjusting nut to obtain desired pressure reading on gauge.

3.

Lock jamnut against adjusting nut, making sure the adjusting nut does not turn.

5.

Re-check relief setting.

13.5

Tigercat M726D Mulcher

Tilt

13.6

Tigercat M726D Mulcher SECTION 17 - ATTACHMENT DRIVE MARCH, 2006

CONTENTS - SECTION 17 ATTACHMENT DRIVE - EARLY MACHINES SERIAL NUMBER 726M3001 TO 726M3020 ................................................ 17.2 ATTACHMENT DRIVE - LATER MACHINES SERIAL NUMBER 726M3021 AND UP ....................................................... 17.13 CIRCUIT DESCRIPTION SERIAL NUMBER 726M3001 TO 726M3020 ................................................ 17.5 SERIAL NUMBER 726M3021 AND UP ............................................ 17.17, 17.21 CIRCUIT DIAGRAM SERIAL NUMBER 726M3001 TO 726M3020 ................................................ 17.6 CUT-OFF PRESSURE SERIAL NUMBER 726M3021 AND UP ............................................ 17.17, 17.28 CUTTER CONTROL VALVE SERIAL NUMBER 726M3001 TO 726M3020 ................................................ 17.4 ELECTRONIC DISPLACEMENT CONTROL SERIAL NUMBER 726M3021 AND UP ............................................ 17.16, 17.28 GAUGE TEST PORTS SERIAL NUMBER 726M3021 AND UP ................................ 17.24, 17.26, 17.28 HYDRAULIC SET-UP PROCEDURE SERIAL NUMBER 726M3021 AND UP ....................................................... 17.25 PRESSURE SETTINGS SERIAL NUMBER 726M3001 TO 726M3020 ..................................... 17.7, 17.10 SERIAL NUMBER 726M3021 AND UP ....................................................... 17.24 PUMP CIRCUIT SCHEMATIC SERIAL NUMBER 726M3021 AND UP ......... 17.18, 17.19, 17.20, 17.22, 17.23 PUMP CONTROL VALVES & RELIEF VALVES SERIAL NUMBER 726M3021 AND UP ............................................ 17.16, 17.28 RELIEF VALVES SERIAL NUMBER 726M3021 AND UP ............................................ 17.16, 17.28 SAFETY SERIAL NUMBER 726M3021 AND UP ....................................................... 17.24 SAW MOTOR. ........................................ SEE SAW MANUFACTURER'S MANUAL SAW VALVES PILOT OPERATED SOLENOID VALVE SERIAL NUMBER 726M3021 AND UP ...................................................................... 17.15

SCHEMATIC - PUMP CIRCUIT SERIAL NUMBER 726M3021 AND UP ......... 17.18, 17.19, 17.20, 17.22, 17.23 SET-UP PROCEDURE SERIAL NUMBER 726M3021 AND UP ....................................................... 17.25 TEST PORTS SERIAL NUMBER 726M3021 AND UP ................................ 17.24, 17.26, 17.28

Tigercat M726D Mulcher Attachment drive ATTACHMENT DRIVE - EARLY MACHINES SERIAL NUMBER 726M3001 TO 726M3020 The following pages of this section deal with the attachment drive for early machines that are not equipped with the multifunction option.

ATTACHMENT PUMP - EARLY MACHINES

•

726M-003

ATTACHMENT PUMP - EARLY MACHINES

CUTTER CONTROL VALVE

726M-067

••

CUTTER CONTROL VALVE LOCATION - EARLY MACHINES 17.2

Tigercat M726D Mulcher

Attachment drive

ATTACHMENT PUMP

•

PUMP CONTROL VALVE

STANDBY VALVE

PRESSURE COMPENSATOR VALVE

• ••

•• MAXIMUM DISPLACEMENT ADJUSTING SCREW

726M-067

ATTACHMENT PUMP

726M-005

The attachment pump is an axial-piston variable displacement pump controlled by a load sense and pressure compensated pump control. The pump control is mounted directly onto the pump and has a STANDBY pressure adjustment and a PRESSURE COMPENSATOR adjustment.

PUMP CONTROL PRESSURE COMPENSATOR VALVE

The STANDBY pressure valve is part of the pump's loadsensing control. The loadsensing controls pump displacement starting from a zero pump flow condition. If no flow is demanded, only the "standby" pressure required by the system is maintained by the pump.

ATTACHMENT PUMP

Until system pressure reaches the pressure compensator setting, the compensator valve will be in the "return" position blocking oil flow to the swashplate control piston leaving the pump at maximum displacement.

The pump is mounted to the lower right output pad of the pump drive gearbox. The pump drive shaft is connected to the gearbox via a splined adapter.

M724D-27

NOTE: It is important to note that pressure settings and maximum displacement settings for the attachment pump are different for mulching head attachments and saw attachments (feller buncher configuration). Refer to PRESSURE SETTINGS MULCHER and PRESSURE SETTINGS FELLER BUNCHER SAW in THIS SECTION. Refer also to CONVERTING MULCHER TO FELLER BUNCHER CONFIGURATION and CONVERTING FELLER BUNCHER CONFIGURATION TO MULCHER in SECTION 3 of THIS MANUAL.

ATTACHMENT PUMP SCHEMATIC

••

ATTACHMENT PUMP PRESSURE COMPENSATOR VALVE

INPUT SHAFT

••

ATTACHMENT PUMP ~ SIDE VIEW

17.3

Tigercat M726D Mulcher CUTTER CONTROL VALVE

Attachment drive TO ATTACHMENT MOTOR(S) CUTTER CONTROL VALVE MAIN RELIEF ADJUSTING SCREW

••

M724D-28

FROM ATTACHMENT PUMP

CUTTER CONTROL VALVE SCHEMATIC CUTTER CONTROL VALVE The cutter control valve consists of a steel body which houses valve cartridges. The first cartridge combines a solenoid operated control valve and pilot operated check valve. The second is a relief valve cartridge.

The cutter control valve controls the flow of oil from the attachment pump to the attachment motor(s).

CUTTER CONTROL VALVE MAIN RELIEF ADJUSTING SCREW

TEST PORT 'GP'

M724D-05

(2) Transmits a pressure signal via the 'COMP' port to the attachment pump control causing the attachment pump to provide flow to the attachment motor.

The RELIEF VALVE is included to protect the pump in case of failure of the pressure compensator valve on the pump. Oil is diverted to tank via the 'TANK' port.

The RELIEF VALVE is adjusted by loosening the locknut and turning the adjusting screw clockwise to increase the pressure value and counterclockwise to decrease the value. It must be set at least 350 psi higher than the pressure compensator valve setting on the pump.

••

TEST PORT 'GM'

pressure, via internal porting, causes the CHECK VALVE to open and allow system pressure via the 'M' port to reach the attachment motor.

Two gauge test ports 'GP' and 'GM' are provided for attaching pressure gauges when checking pressures.

••

For a complete description of the circuit and pressure setting instructions, refer to PRESSURE SETTINGS: PUMP AND CUTTER CONTROL VALVE.

••

NOTE: It is important to note that pressure settings for the cutter control valve are different for mulching head attachments and saw attachments (feller buncher configuration). Refer to PRESSURE SETTINGS MULCHER and PRESSURE SETTINGS FELLER BUNCHER SAW in THIS SECTION. Refer also to CONVERTING MULCHER TO FELLER BUNCHER CONFIGURATION and CONVERTING FELLER BUNCHER CONFIGURATION TO MULCHER in SECTION 3 of THIS MANUAL.

CUTTER CONTROL VALVE

OPERATING DESCRIPTION When the SOLENOID VALVE is de-energized (saw/cutter switch in OFF position), oil entering the 'P' port is blocked by the CHECK VALVE preventing flow to the attachment motor.

When the SOLENOID VALVE is energized, (saw/ cutter switch ON) the spool in the control valve shifts and: (1) Allows system pressure to reach the back side of the PILOT OPERATED CHECK VALVE. This 17.4

Tigercat M726D Mulcher ATTACHMENT CIRCUIT DESCRIPTION The attachment is driven by variable displacement hydraulic motor(s). A variable displacement hydraulic pump mounted on the pump drive gearbox supplies oil flow to the motor(s) via the cutter control valve. The cutter control valve is solenoid operated with a built in relief and controls the flow of hydraulic oil from the attachment pump to the attachment motor(s).

The saw/cutter switch on the control panel in the cab is used to turn the attachment ON or OFF. It is a 2 position switch controlling the flow of electrical current via a relay to the cutter control valve solenoid.

IMPORTANT To maximize pump and motor life, do not shut the engine off until the cutter has come to a complete stop.

Attachment drive valve back to the STANDBY valve on the pump to prevent the STANDBY spool from shifting. This will override the standby pressure setting and allow the attachment pump to build up pressure.

When the pressure (system pressure) builds up to the attachment pump's pressure compensator valve setting the spool in the pump pressure compensator valve shifts to direct oil to the opposite end of the pump swashplate control piston. The piston moves the swashplate to the near neutral position, this will cut back the flow of oil from the pump while at the same time maintaining system pressure and continuing to turn the cutter. As the cutter gains momentum system pressure will drop below the pump pressure compensator valve setting.

This system results in a lower horsepower requirement and reduces heat generation since the pump reduces output rather than dumping hydraulic oil over relief valves.

Some attachments are equipped with variable displacement motors which adjust displacement in response to system pressure.

CAUTION Serious component damage will result: • Never stop engine with cutter rotating.

• Always stop cutter with engine at idle.

For explanation of attachment motor, refer to ATTACHMENT MANUFACTURER'S MANUAL.

NOTE: The attachment will not run unless both cab doors are closed and the pilot reset switch is pressed to activate the pilot system.

For additional information, refer to SAW/CUTTER SWITCH and PILOT RESET SWITCH in SECTION 2 of the OPERATOR'S MANUAL. With the saw/cutter switch in the OFF position, the cutter control valve solenoid is de-energized preventing oil flow to the motor. The oil is redirected, via internal ports in the pump, to the PRESSURE COMPENSATOR valve and the STANDBY valve mounted on the back of the pump. When pressure builds up to the standby pressure setting the spool in the STANDBY valve shifts to direct oil to the control piston of the pump swashplate, moving it to the neutral position. In this condition the pump flow is reduced to a minimum.

With the saw/cutter switch in the ON position, the cutter control valve solenoid is energized directing the flow of oil to unseat a PILOT OPERATED CHECK VALVE in the cutter control valve. This allows high pressure oil to flow from the attachment pump to the attachment motor(s).

Pilot oil is also directed from the cutter control 17.5

NOTE: It is important to note that pressure settings for both the attachment pump and the cutter control valve are different for mulching head attachments and feller buncher saw attachments.

Refer to PRESSURE SETTINGS MULCHER and PRESSURE SETTINGS FELLER BUNCHER SAW in THIS SECTION. Refer also to CONVERTING MULCHER TO FELLER BUNCHER CONFIGURATION and CONVERTING FELLER BUNCHER CONFIGURATION TO MULCHER in SECTION 3 of THIS MANUAL.

Tigercat M726D Mulcher

Attachment drive

ATTACHMENT CIRCUIT DIAGRAM - EARLY MACHINES M726D-085

17.6

Tigercat M726D Mulcher PRESSURE SETTINGS - EARLY MACHINES ATTACHMENT PUMP MULCHER ATTACHMENT: NOTE: Refer to RELIEF VALVE ADJUSTING PROCEDURE in SECTION 18 of THIS MANUAL. Before starting this procedure, read the following safety precautions:~ •

Never assume that other workers are aware of mulching head dangers.

•

Do not operate with discharge areas of the mulching head pointed toward people, vehicles, or buildings.

•

Guards, wear plates and covers must be properly attached during operation.

•

Do not, under any circumstances, overspeed the rotating cutter RPM.

•

A slowly rotating cutter can crush bones.

Beware of pinch points when rotating cutter by hand.

•

Never operate the mulching head inside of a building and always warn others to keep clear of the area.

•

Do not reach between boom crank arms or link arms at any time during setup.

•

Mulcher door opens and closes quickly.

Keep clear of its operating range.

•

Wear safety shoes and safety glasses when working on mulching head.

•

Keep mulcher door closed whenever possible during setup.

•

If a vibration or imbalance is detected, shut down immediately and check problem.

•

Check torque on cutter tool mounting bolts before starting cutter.

Attachment drive NOTE: When converting a machine from Feller Buncher configuration to Mulcher configuration ensure that attachment pump maximum displacement is reset for mulcher configuration before setting pressures. Refer to CONVERTING FELLER BUNCHER CONFIGURATION TO MULCHER - RESET ATTACHMENT PUMP MAXIMUM DISPLACEMENT in SECTION 3 of THIS MANUAL. NOTE: This set-up procedure applise to a Fecon Mulching Head.

1. Park machine on level ground, close mulcher door and lower mulching head to the ground.

Adjust depth shoes or rest depth shoes on firm blocks so that the rotating cutter is approximately 6" off the ground. Set parking brake ON. Install articulation lock bar, block wheels and stop engine.

WARNING To prevent injury caused by accidental steering of the machine when setting pressures, make sure the articulation lock bar is held securely in place by the lynch pins provided.

2. Remove all guards and check that the area in and around the rotating cutter is free of loose objects (wood, stones, nuts, bolts, etc.). Make sure all tools and spare parts are removed from the area.

3. Rotate slowly by hand and check for damage and "wobble ".

4. Check the torque on both the cutter tool mounting bolts and rotor mounting bolts.

5. Block rotor from rotating as outlined in mulching head manufacturer’s manual.

For more safety information refer to SECTION 1 of THIS MANUAL.

6. Clear area under the mulcher of all loose dirt, stones, wood and debris.

WARNING

7. Keep mulcher head 6" off the ground (15 cm).

Always allow the rotating cutter to coast to a COMPLETE STOP before approaching mulching head to make adjustments.

WARNING

WARNING

Do not stand above or below the attachment and lift boom or between the boom and front chassis during this procedure.

Workers on the ground should stand behind behind a safe barrier to provide protection from thrown objects.

17.7

Tigercat M726D Mulcher

Attachment drive FLUSHING VALVES TURN IN FULLY BACK OUT 1 1/2 TURNS

SPIKE RELIEF VALVE

•

•

PUMP CONTROL VALVE

• • MAXIMUM DISPLACEMENT ADJUSTING SCREW

726M-035

MULCHING HEAD SPIKE RELIEF VALVE AND FLUSHING 726M-067

8. Turn relief on spike relief valve (on overrunning protection manifold) in mulching head all the way in, turn the remaining two relief valves on the spike relief block all the way in, then turn them both out 1 ½ turns.

CUTTER CONTROL VALVE MAIN RELIEF ADJUSTING SCREW

ATTACHMENT PUMP

PRESSURE COMPENSATOR VALVE

STANDBY VALVE

•• •

••

726M-005

PUMP CONTROL

16. Start the engine and set throttle control to 1200 rpm.

TEST PORT 'GM'

••

NOTE: Close both doors and press pilot reset switch to operate the saw/cutter.

••

TEST PORT 'GP'

M724D-

17. Place the saw/cutter switch in the ON position.

18. Loosen locknut and adjust pressure compensator valve adjusting screw on the attachment pump to a setting of 5800psi on 'GP' test port. This is a temporary adjustment until the mulcher head spike relief has been set

CUTTER CONTROL VALVE

9. Install two 0-1000 psi pressure gauges in test ports 'GM' and 'GP' on cutter control valve.

10. Warn all persons to stay clear of area and especially the discharge area. Start the engine and raise hydraulic oil temperature to 120°F - 140°F.

19. Turn out the mulcher head spike relief valve pressure to approximately 5800 psi on 'GM' gauge, a hissing sound will be heard as oil begins to pass over the relief and there will be a change in the sound of the engine.

Immediately place the the saw/cutter switch in the OFF position to minimize heating of the hydraulic oil.

NOTE: Refer to RELIEF VALVE ADJUSTING PROCEDURE in THIS SECTION.

11. Set throttle control to 1200 rpm.

12. Measure standby pressure with saw/cutter switch in the OFF position. Gauge should read 600 psi, if not, adjust standby valve on the saw pump pressure compensator valve.

13. Stop engine.

20. Turn the pressure compensator valve adjusting screw OUT one turn to ensure oil is not heated by flowing over the relief valve.

14. Screw main relief valve adjusting screw on cutter control valve all the way IN. 15. Screw the mulcher head spike relief valve all the way IN. 17.8

Tigercat M726D Mulcher

Attachment drive

21. Loosen locknut and adjust pressure compensator valve adjusting screw on the attachment pump to a setting of 5500psi on 'GP' test port. This is a temporary adjustment until the cutter control main relief valve has been set.

29. Decrease throttle to idle, allow rotor to slow down and turn mulching head (cutter switch) off.

WARNING

22. Place the saw/cutter switch in the ON position.

23. Turn out the cutter control valve main relief valve pressure to approximately 5500 psi on 'GM' gauge, a hissing sound will be heard as oil begins to pass over the relief and there will be a change in the sound of the engine.

Immediately place the the saw/cutter switch in the OFF position to minimize heating of the hydraulic oil.

NOTE: Refer to RELIEF VALVE ADJUSTING PROCEDURE in THIS SECTION. 24. Turn the pressure compensator valve adjusting screw OUT one turn to ensure oil is not heated by flowing over the relief valve.

25. Place the saw/cutter switch in the ON position.

NOTE: Close both doors and press pilot reset switch to operate the saw/cutter.

26. Set pressure compensator valve on attachment pump to 5000 psi on 'GP' gauge.

After cutter switch and engine have been turned off, the mulching head will continue to rotate for an extended period of time (up to five minutes). Do not approach machine until rotor has completely stopped turning.

30. Once rotor has stopped turning lower mulching head to the ground and replace side cover plate.

NOTE: Some attachments are equipped with variable displacement motor(s) which may require adjustment. Other attachments are equipped with fixed displacement motor(s) which require no adjustment.

For explanation of attachment motor, refer to ATTACHMENT MANUFACTURER'S MANUAL. SET MOTOR POR (BEGIN OF DISPLACEMENT REGULATION) If applicable - applies only to variable displacement attachment motor(s).

SET MOTOR MINIMUM DISPLACEMENT If applicable - applies only to variable displacement attachment motor(s).

WARNING

Refer to the attachment manufacturer's own OPERATOR AND MAINTENANCE MANUAL for this information.

Always allow the rotating cutter to coast to a COMPLETE STOP before approaching mulching head to make adjustments.

27. Place the saw/cutter switch in the OFF position. Stop engine and remove block from rotating cutter. Remove pressure gauges and wipe up any excess oil.

28. Remove one of the side cover plates of the mulching head and install photo-tack tape on the front pulley sheave. Start the engine and raise the mulching head approximately 10” off the ground. Set engine speed to 1800 rpm.

Ensure that no one is near the mulching head and that the debris door is closed. Turn the mulching head (cutter switch) on. Once the mulching rotor is up to speed approach the mulching head from the side. Do not stand in front or behind the machine while the mulcher is operating. Measure the rotor speed to ensure that it is within 1680-1780 rpm.

17.9

Tigercat M726D Mulcher PRESSURE SETTINGS - EARLY MACHINES ATTACHMENT PUMP SAW ATTACHMENT NOTE: Refer to RELIEF VALVE ADJUSTING PROCEDURE in SECTION 18 of THIS MANUAL. Before starting this procedure, read the following safety precautions:~ •

Never assume that other workers are aware of disc saw dangers.

•

Do not point the discharge side of the saw toward people, vehicles, buildings, or the machine.

Attachment drive NOTE: When converting a machine from Mulcher configuration to Feller Buncher configuration ensure that attachment pump maximum displacement is reset for mulcher configuration before setting pressures. Refer to CONVERTING MULCHER CONFIGURATION TO FELLER BUNCHER CONFIGURATION - RESET ATTACHMENT PUMP MAXIMUM DISPLACEMENT in SECTION 3 of THIS MANUAL.

DANGER DO NOT operate saw before adjusting the attachment pump maximum displacement.

Attachment pump maximum displacement is significantly lower for the saw attachment (33 gpm) than for the mulcher attachment (78 gpm).

Attachment pump maximum displacement must be lowered to prevent overspeeding of the saw blade. Overspeeding of the saw blade may result in serious injury or death.

Overspeeding may also result in component damage or subsequent malfunction.

•

Guards, wear plates and covers must be properly attached during operation of saw blade.

•

Do not, under any circumstances, overspeed the saw blade RPM.

•

Be aware that the saw blade is virtually silent as it coasts to a stop.

•

A slowly rotating blade can crush bones.

Beware of pinch points when rotating blade by hand.

•

Never operate the saw head inside of a building and always warn others to keep clear of the area.

•

Do not reach between boom crank arms or link arms at any time during setup.

•

Clamp and Accumulator arms open and close very rapidly. Keep clear of their operating range.

•

Wear safety shoes and safety glasses when working on saws.

•

Keep clamp and accumulator arms closed whenever possible during setup.

•

If a vibration or imbalance is detected, shut the saw down immediately and check problem.

•

Check torque on saw blade mounting bolts and tooth mounting bolts before starting saw.

•

Install saw blade locking pin, except when setting motor "begin of stroke" and blade RPM.

1. Park machine on level ground, lower saw head to approximately 6" off the ground, set parking brake ON. Install articulation lock bar, block wheels and stop engine.

WARNING To prevent injury caused by accidental steering of the machine when setting pressures, make sure the articulation lock bar is held securely in place by the lynch pins provided.

2. Remove all guards and check that the area in and around the saw blade is free of loose objects (wood, stones, nuts, bolts, etc.).

Make sure all tools and spare parts are removed from the saw head area.

3. Rotate blade slowly by hand and check for "runout " and "wobble ".

4. Check the torque on both the saw blade mounting bolts and the saw tooth mounting bolts.

5. Properly install the saw blade guard using all hardware provided. Guard must be secure.

WARNING Always allow the blade to coast to a COMPLETE STOP before approaching saw head to make adjustments.

6. Block saw blade from rotating as outlined in saw head manufacturer’s manual.

17.10

Tigercat M726D Mulcher

Attachment drive

7. Clear area under the saw of all loose dirt, stones, wood and debris.

CUTTER CONTROL VALVE MAIN RELIEF ADJUSTING SCREW

WARNING

•

Workers on the ground should stand behind the wheels of the machine to provide an added barrier to thrown objects.

WARNING

TEST PORT 'GM'

Do not stand above or below the felling head and lift boom or between the boom and front chassis during this procedure.

TEST PORT 'GP'

8. Keep saw head 6" off the ground (15 cm) for the remaining steps of this procedure.

M724D-

9. Warn all persons to stay clear of area and especially the discharge side of saw head.

• • CUTTER CONTROL VALVE

17. Place the saw/cutter switch in the ON position.

NOTE: Close both doors and press pilot reset switch to operate the saw/cutter.

10. Start the engine and raise hydraulic oil temperature to 120°F - 140°F. 11. Set throttle control to 1200 rpm.

•

PUMP CONTROL VALVE

• MAXIMUM DISPLACEMENT ADJUSTING SCREW

726M-067 M724D-03

CUTTER/SAW PRESSURE GAUGE

12. Measure standby pressure with saw/cutter switch in the OFF position. Gauge should read 600 psi, if not, adjust standby valve on the saw pump pressure compensator valve.

ATTACHMENT PUMP

PRESSURE COMPENSATOR VALVE

STANDBY VALVE

• •

13. Stop engine.

14. Install two 0-5000 psi pressure gauges in test ports 'GM' and 'GP' on cutter control valve.

15. Screw in main relief valve adjusting screw on cutter control valve all the way IN.

PUMP CONTROL 18. Loosen locknut and adjust pressure compensator valve adjusting screw on the attachment pump to a setting of 3900 psi on 'GP' test port. This is a temporary adjustment until the cutter control main relief valve has been set.

726M-005

16. Start the engine and set throttle control to 1200 rpm.

17.11

Tigercat M726D Mulcher

Attachment drive

19. Adjust the cutter control valve main relief valve pressure lower to approximately 3900 psi on 'GM' gauge, a hissing sound will be heard as oil begins to pass over the relief and there will be a change in the sound of the engine.

Immediately place the the saw/cutter switch in the OFF position to minimize heating of the hydraulic oil.

NOTE: Refer to RELIEF VALVE ADJUSTING PROCEDURE in THIS SECTION. 20. Turn the pressure compensator valve adjusting screw OUT one turn to ensure oil is not heated by flowing over the relief valve.

21. Place the saw/cutter switch in the ON position.

NOTE: Close both doors and press pilot reset switch to operate the saw/cutter.

22. Set pressure compensator valve on attachment pump to 3650 psi on 'GP' gauge.

23. Place the saw/cutter switch in the OFF position. Stop engine and remove block from blade. Remove pressure gauges and wipe up any excess oil.

Refer to ATTACHMENT MANUFACTURER'S MANUAL for Saw Blade Speed and Begin Of Regulation settings.

NOTE: Some attachments are equipped with variable displacement motor(s) which may require adjustment. Other attachments are equipped with fixed displacement motor(s) which require no adjustment.

For explanation of attachment motor, refer to ATTACHMENT MANUFACTURER'S MANUAL. SET MOTOR POR (BEGIN OF DISPLACEMENT REGULATION) If applicable - applies only to variable displacement attachment motor(s).

SET MOTOR MINIMUM DISPLACEMENT If applicable - applies only to variable displacement attachment motor(s).

Refer to the attachment manufacturer's own OPERATOR AND MAINTENANCE MANUAL for this information.

17.12

Tigercat M726D Mulcher Attachment drive ATTACHMENT DRIVE - LATER MACHINES SERIAL NUMBER 726M3021 AND UP

726D-050

DISC SAW FELLING HEAD OPTION

726M-007

SAW/MULCHER - MULTIFUNCTION OPTION

MULCHING HEAD OPTION

This OPTION includes the following features:

Later machines serial number 726M3021 and up may be equipped with the MULTIFUNCTION OPTION capability. This option provides for quick attachment/detachment of either a Tigercat Disc Saw Felling Head or a Fecon BH250 Mulching Head.

See CHANGING THE ATTACHMENT in section 2 of the Operator's Manual.

726M-021

•

QUICK ATTACH/DETACH COUPLERS

Quick Attachment Hydraulic Couplers for both attachments.

MODE SELECTOR SWITCH

••

726M-023

MODE SELECTOR SWITCH

WARNING •

Personal injury and serious machine damage may result if a saw is run on this machine with the mode selector switch in the mulcher position.

If the saw is run in the mulcher mode the saw blade may over-speed and may run at unsafe pressures. This may result in very short bearing, blade, saw motor and tooth life. Due to the increased speed of the saw blade, debris and loose machine components may be sent out of the saw housing at very high speeds.

Attachment Mode Selector Switch.

MODE INDICATOR LIGHTS

••

CUTTER ON/OFF SWITCH

•• •• 726M-022

• 17.13

MODE INDICATOR LIGHTS

Mode Indicator Lights on instrument panel.

Tigercat M726D Mulcher

Attachment drive WARNING NEVER operate the disc saw felling head with the mode selector switch in the Mulcher Mode! Personal injury and serious machine damage may result.

When attachment mode selector switch is in the “Saw” position, the attachment pump pressure will be limitted to 3600 psi. When the “cutter” switch is turned on, the attachment pump will stroke to its required displacement and the saw blade speed will ramp up to 1150 rpm.

In the “Saw Mode” all return flow from the attachment, fan & steer circuits flow through the oil cooler.

MODE SELECTOR SWITCH 726D-036

•

SAW/MULCHER PUMP

• ••

Electronically Controlled Saw/Mulcher Pump.

UNLOCKED IN MULCHER MODE

ATTACHMENT MODE SELECTION WHEN RUNNING A SAW: Ready to run a saw: MODE SELECTOR SWITCH

• ••

LOCKED IN SAW MODE

726M-023

MODE SELECTOR SWITCH SHOWN IN MULCHER MODE

WHEN RUNNING A MULCHER:

726M-023

MODE SELECTOR SWITCH SHOWN LOCKED IN SAW MODE

After the disc saw felling head has been attached, ensure that the mode selector switch is locked in the “Saw” position. The mode selector switch is located underneath the instrument panel, and can be accessed from the RHS cab door. When the pilot reset switch is pressed and the pilot circuit is active, the “Saw Mode” LED on the instrument panel (below the “Cutter” switch) will illuminate.

This indicates that the attachment mode selector switch is in “Saw Mode”.

Ensure that the attachment mode selector switch is in the mulcher position. The attachment mode selector switch is located underneath the instrument panel, and can be accessed from the RHS cab door. When the pilot reset switched is pressed and the pilot circuit is active, the “Mulcher Mode” LED on the instrument panel (below the “Cutter” switch will illuminate. This indicates that the attachment mode selector switch is in “Mulcher Mode”.

When the attachment mode selector switch is in the “Mulcher” position, the attachment pump pressure will be limitted to 4800 psi. When the “Cutter” switch is turned on, the attachment pump will stroke to full displacement and the mulcher rotor will ramp up to 1750 to 1800 rpm.

In the “Mulcher Mode” only return flow from the attachment flows through the cooler.

17.14

Tigercat M726D Mulcher

Attachment drive

CONTROL VALVES The attachment circuit is controlled by a pilot activated logic valve (1) located in the control valve manifold block. The manifold block is mounted on top of the attachment pump. When the cutter switch in the cab is activated the attachment solenoid (C2) on the pilot manifold is energized which directs pilot oil to the attachment control logic valve in the control valve manifold block allowing attachment pump oil to flow to the attachment motor/s.

1

As well as the pilot activated logic valve, the control valve manifold block also contains the saw relief valve, main relief valve, solenoid control for mulcher mode, 'M' port outlet to attachment, 'T' port outlet to tank, 'P' port, 'P2' port, 'DR' port, 'GM' and 'GP' test ports.

Pressure Cut-off Located on the right side near the bottom of the pump is the differential pressure and cut-off pressure relief valves. As system pressure rises to the cut-off setting, the swashplate de-strokes to prevent the system pressure from exceeding the cut-off setting.

Differential Pressure - 280 psi (19.3 bar) Cut-off Pressure - 4800 psi (331 bar) Electronic Displacement Control Also mounted on the side of the pump is the displacement control and an electronic proportional pressure-reducing valve (PPRV) is added to the regulator so the pump flow can be infinitely controlled within the range of the pump.

An increase in electric signal to the PPRV will result in an increase in flow. Pilot pressure (550 psi) is supplied to the PSV port for regulator operation.

726M-079

When the Saw/Mulcher Mode Selector Switch is in the mulcher mode and the cutter switch is 'ON', the solenoid control on the control valve manifold block is energized and the electronic proportional pressure-reducing valve has maximum current (600mA) flowing to the solenoid from the electronic controller providing 82 gpm full flow and full pressure (4800 psi) pump output for MULCHER MODE. When the Saw/Mulcher Mode Selector Switch is in the saw mode, the solenoid control on the control valve manifold block is de-energized and the electronic proportional pressure-reducing valve has 472 mA flowing to the solenoid from the electronic controller providing 34 gpm pump output @ 3600 psi for SAW MODE. 17.15

ATTACHMENT PUMP SCHEMATIC DIAGRAM

Tigercat M726D Mulcher

Attachment drive FLOW ADJUSTMENT SCREW

• SAW/MULCHER CONTROL VALVE

••

SAW/MULCHER PUMP

•

•

CUT-OFF PRESSURE 4800 PSI

MAXIMUM DISPLACEMENT ADJUSTMENT

OUTLET 'M' PORT TO ATTACHMENT

'P' PORT PILOT SUPPLY

••

DRAIN

SAW RELIEF VALVE 3600 PSI

• ••

PILOT ACTIVATED LOGIC VALVE

•

ELECTRONIC DISPLACEMENT CONTROL SOLENOID DISPLACEMENT CONTROL VALVE

•

MAIN RELIEF VALVE 5300 PSI

••

•

SAW/MULCHER PUMP

••

726M-033

CONTROL SOLENOID MULCHER MODE

•

SAW/MULCHER CONTROL VALVE

RETURN TO TANK

'P2' PORT

•

••

•

• •

DIFFERENTIAL PRESSURE 280 PSI

SAW/MULCHER PUMP- CONTROL VALVES & RELIEF VALVES 17.16

••

Tigercat M726D Mulcher CIRCUIT DESCRIPTION - MULCHER

Attachment drive

The mulcher rotor is belt driven via a belt and pulley arrangement on each side of the rotor. Two (axial piston, bent axis) fixed displacement hydraulic motors drive the pulleys on each side of the mulcher attachment. A variable displacement electronically controlled hydraulic pump mounted on the pump drive gearbox supplies oil flow to the motors. Pump flow is controlled by the electronic controller.

SAW/MULCHER CONTROL VALVE

••

IMPORTANT To maximize pump and motor life, do not shut the engine off until the attachment cutter/blade has come to a complete stop.

An electrical signal from the cutter switch energizes the solenoid in the pilot valve to shift the spool and direct pilot oil to the logic valve in the cutter controll valve to shift it to the open position. The signal from the cutter switch also indicates to the electronic controller that the mulcher is on. The controller then sends a 600mA signal to the cutter pump which puts the pump into full displacement.

MODE SELECTOR SWITCH

•• •

SAW/MULCHER PUMP

UNLOCKED IN MULCHER MODE

•• 726M-023

The Saw/Mulcher control valve is pilot operated and opens and closes to allow flow of hydraulic oil from the pump to the motor. A main relief valve and saw relief valve are installed in the Saw/ Mulcher control valve.

••

A mode selector switch (located below the instrument panel inside the R.H. cab door) is used to select mulcher mode or saw mode.

When in the mulcher mode the pump displacement is 140cc/rev.

MODE SELECTOR SWITCH

A solenoid operated pilot valve (C2) in the pilot manifold controls the flow of pilot oil to the logic valve in the cutter control valve.

MODE INDICATOR LIGHTS

•• •

CUTTER ON/OFF SWITCH

726M-023

•• • 726M-022

MODE SELECTOR SWITCH SHOWN IN MULCHER MODE

LOCKED IN SAW MODE

MODE SELECTOR SWITCH SHOWN LOCKED IN SAW MODE

When in the saw mode, the pump displacement is 81cc/rev.

Refer to section 2 of the Operator's Manual for more details on Mode Selection.

MODE INDICATOR LIGHTS

The cutter switch on the control panel in the cab is used to turn the mulcher ON or OFF. It is a two position switch with a built in green light. This switch controls the flow of electrical current to the pilot valve solenoid.

17.17

Tigercat M726D Mulcher

Attachment drive FLUSHING VALVES TURN IN FULLY THEN BACK OUT 1 1/2 TURNS

•

726M-027

•

ATTACHMENT PUMP CIRCUIT SCHEMATIC - MULCHING HEAD 17.18

Tigercat M726D Mulcher

726M-027A

Attachment drive

ATTACHMENT PUMP CIRCUIT SCHEMATIC - MULCHING HEAD "ON" 17.19

Tigercat M726D Mulcher

726M-082

Attachment drive

ATTACHMENT ELECTRICAL CIRCUIT SCHEMATIC 17.20

Tigercat M726D Mulcher CIRCUIT DESCRIPTION - SAW

Attachment drive IMPORTANT

The saw blade is driven by a variable displacement hydraulic motor (axial piston, bent axis) which is mounted directly above the saw blade and coupled to the saw blade through a drive shaft. A variable displacement electronic controlled hydraulic pump mounted on the pump drive gearbox supplies oil flow to the motors.

Pump flow is controlled by the electronic controller.

SAW/MULCHER CONTROL VALVE

To maximize pump and motor life, do not shut the engine off until the attachment cutter/blade has come to a complete stop.

An electrical signal from the cutter switch energizes the solenoid in the pilot valve to shift the spool and direct pilot oil to the logic valve in the cutter control valve, shifting it to the open position. The electric signal from the cutter switch is simultaneously sent to the electronic controller.

The controller then sends 472mA to the cutter pump which puts the pump into the correct flow (34 gpm) for the saw mode.

••

The controller also determines if the mode selector switch is in the correct position by reading the value of the attachment ID resistor. If the resistor corresponds with the position of the mode selector switch it will then turn the pump ON. If not it will display a red blink code.

SAW/MULCHER PUMP

••

When running a saw the controller also looks for a signal from the saw speed sensor. If the saw blade overspeeds the controller will turn the pump off and display a blink code. If there is no signal from the speed sensor for 60 seconds the controller will turn the pump off and display a blink code.

The Saw/Mulcher control valve is pilot operated and controls the flow of hydraulic oil from the pump to the motor. A main relief valve and saw relief valve are installed in the Saw/Mulcher control valve.

MODE SELECTOR SWITCH

•• •

A solenoid operated pilot valve (C2) in the pilot manifold controls the flow of pilot oil to the logic valve in the cutter control valve.

MODE INDICATOR LIGHTS

••

CUTTER ON/OFF SWITCH

726M-023

UNLOCKED IN MULCHER MODE

MODE SELECTOR SWITCH SHOWN IN MULCHER MODE

A mode selector switch (located below the instrument panel inside the R.H. cab door) is used to select mulcher mode or saw mode.

•• •

When in the mulcher mode the pump displacement is 140cc/rev.

MODE SELECTOR SWITCH

726M-022

MODE INDICATOR LIGHTS

•

The cutter switch on the control panel in the cab is used to turn the saw ON or OFF. It is a two position switch with a built in green light. This switch controls the flow of electrical current via the relay to the pilot valve solenoid.

•• 726M-023

LOCKED IN SAW MODE

MODE SELECTOR SWITCH SHOWN LOCKED IN SAW MODE

When in the saw mode, the pump displacement is 81cc/rev.

17.21

Tigercat M726D Mulcher

726M-028

Attachment drive

ATTACHMENT PUMP CIRCUIT SCHEMATIC - SAW HEAD 17.22

Tigercat M726D Mulcher

726M-027A

Attachment drive

ATTACHMENT PUMP CIRCUIT SCHEMATIC - SAW HEAD "ON" 17.23

Tigercat M726D Mulcher

Attachment drive

PRESSURE SETTINGS:

•

Before starting this procedure, read the following safety precautions:~ • Never assume that other workers are aware of disc saw dangers.

• Do not point the discharge side of the saw toward people, vehicles, buildings, or the machine.

• Guards, wear plates and covers must be properly attached during operation of saw blade.

• Do not, under any circumstances, overspeed the saw blade RPM. • Be aware that the saw blade is virtually silent as it coasts to a stop.

• A slowly rotating blade can crush bones.

Beware pinch points when rotating blade by hand.

• Never operate the saw head inside of a building and warn others to keep clear of the area.

• Do not reach between boom crank arms or link arms at any time during setup.

• Clamp and Accumulator arms open and close very rapidly. Keep clear of their operating range.

• Wear safety shoes and safety glasses when working on saws.

• Keep clamp and accumulator arms closed whenever possible during setup.

• If a vibration or imbalance is detected, shut the saw down immediately and check problem.

•

Check torque on saw blade mounting bolts and tooth mounting bolts before starting saw.

Install saw blade locking pin, except when setting motor "begin of stroke" and blade RPM.

WARNING Always allow the blade to coast to a COMPLETE STOP before approaching saw head to make adjustments.

WARNING To prevent injury caused by accidental steering of the machine when setting pressures, make sure the articulation lock bar is held securely in place by the lynch pins provided.

WARNING Workers on the ground should stand behind a barrier to provide protection from thrown objects.

WARNING Do not stand above or below the felling head and lift boom or between the boom and front chassis during this procedure.

10000 PSI GAUGE SAW RELIEF VALVE TEST PORT ‘GM’

•• MAIN RELIEF VALVE

'POR' PRESSURE 4800 PSI

DIFFERENTIAL PRESSURE 280 PSI

10000 PSI GAUGE MAIN RELIEF VALVE TEST PORT ‘GP’

•

SAW/MULCHER CONTROL VALVE

••

•

6 THREADS

•• ••

•• •

8 THREADS

726M-033

SAW/MULCHER PUMP- GAUGE TEST PORTS 17.24

Tigercat M726D Mulcher

Attachment drive 3. Check to ensure that the rotating cutter is free from all loose objects (stones, nuts, bolts, etc.)

HYDRAULIC SET-UP PROCEDURE: KAWASAKI ATTACHMENT PUMP Tools required for Attachment Pump Set-up:

4. Slowly rotate the rotor by hand and check for any loose teeth, damage or “wobble”.

1-1/4" Hex Wrench 1-1/16" Hex Wrench 1/2" Hex Wrench 1/2“ Hex Socket 19 mm Hex Wrench 10 mm Hex Wrench 5 mm Allen Key 3 mm Allen Key `

MULCHING HEAD ROTOR LOCK

5000 PSI Pressure Gauge 10000 PSI Pressure Gauge

726M-036

5. Block rotor from rotating by using a rotor lock or large block of wood to “dead head the pump”.

6. Turn the main relief on the cutter control valve all the way in.

Mulcher Circuit Set-up:

7. Turn pump pressure compensator (POR) all the way out (the POR is located on the pump controller under the pump and is closer to the right-hand side of the machine).

337-20

SPIKE RELIEF VALVE

PARKING BRAKE ENGAGED POSITION

••

1. With a mulching head installed on the machine, park the machine on level ground, tilt mulching head forward for better access, lower mulching head to the ground, set parking brake and install articulation lock.

Remove centre access cover.

MAIN RELIEF VALVE

10000 PSI GAUGE SAW RELIEF VALVE TEST PORT ‘GM’

••

• •• •

726M-035

MULCHING HEAD OVERRUNNING RELIEF VALVE AND FLUSHING BLOCK

10000 PSI GAUGE MAIN RELIEF VALVE TEST PORT ‘GP’

8. Turn the spike relief valve in mulching head all the way in, turn the two loop flushing flow control valves on the spike relief block all the way in, then turn them both out 1 ½ turns.

••

•

FLUSHING VALVES TURN IN FULLY BACK OUT 1 1/2 TURNS

••

9. Start engine and raise hydraulic oil temperature as per HYDRAULIC OIL HEATUP procedure in this section.

SAW/MULCHER CONTROL VALVE 726M-033

10. Set engine speed to 1500 rpm.

2. Engine off, install gauges at the following locations: Cutter Control Valve GP

10,000 psi gauge

GM

10,000 psi gauge

11. Place the mode selector switch in “Mulcher Mode” and turn mulching head (cutter switch) on.

17.25

Tigercat M726D Mulcher

Attachment drive 10000 PSI GAUGE SAW RELIEF VALVE TEST PORT ‘GM’

•• ••

SAW/MULCHER CONTROL VALVE MAIN RELIEF VALVE

'POR' PRESSURE 4800 PSI

DIFFERENTIAL PRESSURE 280 PSI

10000 PSI GAUGE MAIN RELIEF VALVE TEST PORT ‘GP’

•

••

6 THREADS

•• ••

•• ••

8 THREADS

726M-033

SAW/MULCHER PUMP- GAUGE TEST PORTS

12. Set pump pressure comp. (POR) to 5600 psi for spike relief pressure setting, measured at GP test port).

21. Turn mulching head (cutter switch) off, turn engine off and remove rotor lock or wooden block from rotor.

13. Turn out relief on the spike relief valve (in mulching head) until the engine rpm drops, this should occur at approximately 5600 psi (measured at GP test port). As oil begins to pass over the relief the engine rpm will droop.

Immediately turn the mulching head (cutter switch) off. Lock the spike pressure relief valve in this position.

22. Remove one of the side cover plates of the mulching head and install photo-tachometer tape on the front pulley sheave. Start the engine and raise the mulching head approximately 10” off the ground. Set engine speed to 1800 rpm. Ensure that no one is near the mulching head and that the debris door is closed. Turn the mulching head (cutter switch) on. Once the mulching rotor is up to speed approach the mulching head from the side. Do not stand in front or behind the machine while the mulcher is operating.

Measure the rotor speed to ensure that it is within 1680-1780 rpm.

14. Turn the pump pressure comp (POR) out 1 turn.

15. Turn mulching head (cutter switch) on.

16. Adjust pump pressure comp. (POR) to 5300 psi for cutter control valve relief (measured at gauge installed at GP test port).

17. Turn out the cutter control valve relief until the engine rpm drops, this should occur at approximately 5300 psi (measured at GP test port). As oil begins to pass over the relief the engine rpm will droop. Immediately turn the mulching head (cutter switch) off.

18. Turn the pump pressure comp. (POR) out 1 turn.

19. Turn mulching head (cutter switch) on.

20. Adjust pump pressure comp. (POR) to 4800 psi (measured at gauge installed at GP test port).

23. Decrease throttle to idle, allow rotor to slow down and turn mulching head (cutter switch) off.

Note: After cutter switch and engine have been turned off, the mulching head will continue to rotate for an extended period of time (up to five minutes). Do not approach machine until rotor has completely stopped turning.

24. Once rotor has stopped turning lower mulching head to the ground and replace side cover plate and centre access cover.

17.26

Tigercat M726D Mulcher SAW CIRCUIT SET-UP

Attachment drive

(if machine is configured as a multifunction machine and is equipped with a saw head) 1. With a saw head installed on the machine, park the machine on level ground, lower saw head to 6 inches above the ground, set parking brake and install articulation lock.

Remove motor cover.

2. Confirm that the saw blade locking pin is in place. Place the mode selector switch in “Saw Mode”, set engine to 1500 rpm and turn saw (cutter switch) on.

Note: If the pump is turned on for 60 secs or more with the saw blade locking pin installed the controller will detect a saw blade speed sensor fault and will turn the pump off. If this fault occurs the cutter switch must be turned OFF to clear fault, then it can be turned back ON.

213-24

·

3. Set remote pressure compensator to 3600 psi (measured at GP port). Turn the saw (cutter switch) off.

Window saw pressure gauge should rise to 3600 psi for about 13 seconds, drop to 3100 psi for about 10 seconds and then drop to 1300-1500 psi as saw reaches full rpm.

From FULL STOP to FULL rpm. should take 28 seconds.

HYDRAULIC OIL HEAT-UP

4. Remove the saw blade locking pin, & confirm that black paint and photo-tachometer tape are on saw blade.

1. Block Air Flow through Oil Cooler, intake side of the Heat Exchanger, with Cardboard. DO NOT block Engine Radiator or Charge Air Cooler.

5. Turn the saw (cutter switch) on, and adjust saw motor POR to 3100 psi. ·

PRESSURE GAUGE

If the saw motor POR pressure setting is not correct, turn the motor regulation screw out to raise the pressure and in to lower the pressure.

6. With the saw (cutter switch) on, measure the saw blade speed. Adjust the minimum displacement screw to set saw blade speed to 1150 +/- 25 rpm.

Note: Adjust the Minimum Displacement Screw with the saw blade turned OFF. Turn OUT to RAISE the speed and turn IN to LOWER the speed.

7. Turn the cutter switch off.

8. When the blade has stopped, set engine rpm to full rpm and turn the cutter switch on.

17.27

2. Full Throttle - Operate Clamp Close and Steer for 15 sec, then off for 5 sec, Repeat. Monitor Engine Temperature and Hydraulic Oil Temperature until Hydraulic Oil Temperature reaches 130 °F. This procedure will take 20-30min depending on Ambient Air Temperature.

Tigercat M726D Mulcher

Attachment drive

SAW RELIEF VALVE 3600 PSI

••

SAW/MULCHER CONTROL VALVE

ELECTRONIC DISPLACEMENT CONTROL SOLENOID

•

DISPLACEMENT CONTROL VALVE MAIN RELIEF VALVE 5300 PSI

••

••

••

SAW/MULCHER PUMP

••

726M-033

SAW/MULCHER PUMP- CONTROL VALVES & RELIEF VALVES 10000 PSI GAUGE SAW RELIEF VALVE TEST PORT ‘GM’ (3600 PSI)

10000 PSI GAUGE MAIN RELIEF VALVE TEST PORT ‘GP’ (5300 PSI) FLOW CONTROL ADJUSTMENT

•• •• •• •• SAW/MULCHER CONTROL VALVE

MAXIMUM DISPLACEMENT ADJUSTMENT

•• CUT-OFF PRESSURE 4800 PSI

DIFFERENTIAL PRESSURE 280 PSI

726M-034

• • SAW/MULCHER PUMP- GAUGE TEST PORTS 17.28

TURN IN TO DECREASE FLOW TURN OUT TO INCREASE FLOW

Tigercat M726D Mulcher SECTION 18 - CLAMPS MARCH, 2006

CONTENTS - SECTION 18 BOOM LIFT LOCK .......................................................................................... 18.6 BOOM VALVE ................................................................................................. 18.2 OPERATING DESCRIPTION ........................................................................ 18.3 SPOOL SECTION DIAGRAM ...................................................................... 18.3 CIRCUIT DIAGRAM ......................................................................................... 18.5 CONTROL VALVES ......................................................................................... 18.2 PILOT LINE PRESSURES ............................. SEE SECTION 5 - PILOT SYSTEM PRESSURE SETTINGS .................................................................................. 18.6 RELIEF VALVES ADJUSTING PROCEDURE .......................................................................... 18.7 OPERATION ................................................................................................ 18.8 SAFETY .......................................................................................................... 18.6 SPOOL SECTION DIAGRAM .......................................................................... 18.3

Tigercat M726D Mulcher CLAMP CONTROL VALVES

Clamps The inlet receives oil from the fixed displacement boom pump.

The clamp and accumulating arm circuits are controlled by a clamp foot control valve, two solenoid operated pilot valves in the pilot manifold (accumulator) and a pilot operated boom valve.

All spools in the valve are open center type. Each spool section is pilot operated. An outlet section directs return oil back to tank.

For a complete description of the pilot manifold refer to SECTION 5 of THIS MANUAL.

Cartridge type port relief valves are installed in both work ports of the clamp spool section and both work ports in the accumulator spool section.

The inlet section has a single main relief valve.

These reliefs protect the circuits from high pressures during operation.

For a complete description of the foot operated pilot valve, refer to FOOT CONTROL VALVE in SECTION 8 of THIS MANUAL. BOOM/CLAMP VALVE The boom/clamp valve is located on the front chassis above the front axle and behind the cover plate. One of the spool sections is used to open and close the clamp and a second spool section to open and close the accumulating arm.

CLAMP 'CLOSE' PORT RELIEF (3200 PSI) CLAMP 'OPEN' PORT RELIEF (1100 PSI)

• ACCUMULATOR 'CLOSE' PORT RELIEF (3200 PSI)

•

•

CLAMP

•

ACCUM

•

•

INLET SECTION GAUGE TEST PORT (IN ELBOW) M726D-000

CONTROL VALVE

18.2

•

ACCUMULATOR 'OPEN' PORT RELIEF (3200 PSI)

MAIN RELIEF (2600 PSI)

Tigercat M726D Mulcher

Clamps

OPERATING DESCRIPTION

Shifting the spool(s) directs oil from the fixed displacement Boom/Fan/Steer Pump to the clamp and accumulating cylinders.

Oil from the fixed displacement boom/fan/steer pump enters the inlet section of the boom/clamp valve and is allowed to pass through the open center spool sections and back to tank via the outlet section.

The relief valves installed in the inlet and spool sections of the valve protect the pump in case of failure of the POR valve on the pump.

The open centered spools have three positions and are self centering. A spring in the spool end cap holds the spool in the center neutral position.

The spools are shifted one way or the other by pilot oil pressure being applied to either end of the spool.

RELIEF VALVE PORT 'A'

PARALLEL PASSAGE

LOAD CHECK VALVE

A

All of the relief valves on the valve divert oil to tank via the tank passages in the spool sections and the outlet section of the boom valve. They also function as anti-cavitation relief valves.

WORK PORT BRIDGE

RELIEF VALVE PORT 'B'

B

PILOT END CAP

PILOT END CAP SPOOL CENTERING SPRING

SPOOL TANK PASSAGE THRU' NEUTRAL PASSAGE

90136-3

CROSS SECTION OF CLAMP SPOOL SECTION

18.3

Tigercat M726D Mulcher CLAMPS

Clamps

The clamp and accumulating arms are operated by separate cylinders. A fixed displacement pump supplies oil to the cylinders via two spool sections in the boom/clamp valve.

The clamp arm is operated by the clamp foot control valve (left side of cab floor). The left pedal is used to OPEN and the right pedal to CLOSE. Pressing the CLAMP OPEN pedal directs pilot oil to shift the spool in the clamp spool section.

Pressing the CLAMP CLOSE pedal directs pilot oil to the opposite end of the spool to shift it in the opposite direction. The spool directs oil from the pump to either end of the clamp arm cylinder to open or close the arm. Return oil is directed back to tank via the oil cooler.

213-20

FOOT PEDALS

The accumulating arm is operated by a 3 position thumb switch OPEN/CLOSE (self centering to OFF) located on the right joystick control. The switch operates two solenoid pilot valves on the pilot manifold which direct pilot oil to the accumulator spool section of the boom control valve, to shift the spool. The spool directs oil from the pump to either end of the accumulating arm cylinder to open or close the arm. Return oil is directed back to tank via the oil cooler and dual head return oil filter.

M760-002 760M-27

18.4

RIGHT JOYSTICK

Tigercat M726D Mulcher

726M-081

Clamps

ACCUMULATING AND CLAMP ARMS CIRCUIT 18.5

Tigercat M726D Mulcher PRESSURE SETTINGS

Clamps TO SET CLAMP AND ACCUMULATOR OPEN AND CLOSE RELIEF VALVES:-

NOTE: Refer to RELIEF VALVE ADJUSTING PROCEDURE in THIS SECTION.

3. Connect a 0 - 5000 psi pressure gauge (with at least 4' of hose) to the mid inlet test port on of the boom control valve.

Before starting this procedure, read the following safety precautions:~ • Never reach between boom crank arms or link arms during machine setup.

• Wear safety glasses and safety shoes when working on shears.

WARNING Do not stand above or below the felling head and lift boom or between the boom and front chassis during this procedure.

• Keep clamp and accumulator arms closed whenever possible during setup.

• Clamp and accumulator arms open and close very rapidly, always keep clear of operating area.

• Do not stand on top or inside of boom arms.

NOTE: This procedure assumes that a Tigercat Bunching Saw Head is used. Follow same procedure for Koehring Waterous 20" Saw Head. Refer to illustration of LIFT BOOM CONTROL VALVE on page 2 for orientation and pressure value references .

1. Park machine on level ground, lower felling head to the ground and set parking brake ON. Install articulation lock bar, block wheels and stop engine.

4. Turn the boom mid inlet main relief adjusting screw all the way IN. 5. Turn the port relief valve adjusting screws on both the accumulator and clamp spool sections of the control valve OUT until spring pressure is relieved then turn adjusting screws one full turn IN. 6. Start the engine, and put the throttle control to the IDLE position.

7. Ensure that the hydraulic oil temperature is between 120°F - 140°F. 8. While holding the left foot pedal down in the CLAMP OPEN position (cylinder fully retracted), check gauge pressure reading.

If less than 1100 psi, stop engine and readjust clamp open port relief. Repeat above procedure until a gauge reading of 1100 psi is obtained.

WARNING To prevent injury caused by accidental steering of the machine when setting pressures, make sure the articulation lock bar is held securely in place by the lynch pins provided.

IMPORTANT

2. Completely raise lift boom and install lift boom cylinder lock over one of the two cylinder rods with the open side at the bottom and wide end up against the keeper plate bolt heads. Install retaining bolt and locknut through center hole.

Slowly lower boom until lock is securely held in place.

WARNING

During the following procedures, DO NOT hold ANY function control for LONGER THAN 5 SECONDS.

IMPORTANT Avoid blowing oil over relief longer than 5 seconds, as excessive heating of hydraulic fluid and damage to boom pump can occur.

IMPORTANT Approach the gauge reading slowly and deliberately by turning the adjusting screw in a little at a time. The pressure setting must not exceed the above value.

Always install boom lift lock before working on or around machine with boom raised.

• Always install 'T' handle retainer bolt • Use only to support boom and cutting head 18.6

Tigercat M726D Mulcher

Clamps ANTI-CAVITATION RELIEF VALVE ADJUSTING PROCEDURE For relief valve with adjusting nut

8. While holding the right foot pedal down in the CLAMP CLOSE position (cylinder fully extended), check gauge pressure reading.

If less than 3200 psi, stop engine and readjust clamp close port relief. Repeat above procedure until a gauge reading of 3200 psi is obtained.

ADJUSTING NUT

•

JAMNUT

•

10. While holding the right joystick thumb switch to the left in the ACCUMULATING ARM OPEN position (accumulator cylinder fully retracted), check gauge pressure reading.

If less than 3200 psi, stop engine and readjust accumulator open port relief. Repeat above procedure until a gauge reading of 3200 psi is obtained.

11. While holding the right joystick thumb switch to the right in the ACCUMULATING ARM CLOSE position (accumulator cylinder fully extended), check gauge pressure reading.

If less than 3200 psi, stop engine and readjust accumulator close port relief. Repeat above procedure until a gauge reading of 3200 psi is obtained.

12. Stop engine, unscrew mid inlet main relief adjusting screw 3 full turns.

13. Start engine and move the throttle control to the FULL position.

IMPORTANT Never run engine at full throttle with main relief turned all the way in.

14. While holding the joystick thumb switch in the ACCUMULATING ARM OPEN position, check gauge pressure reading.

If less than 2600 psi, stop engine and readjust mid inlet main relief. Repeat above procedure until a gauge reading of 2600 psi is obtained.

15. Remove pressure gauge and wipe up any excess oil from test port area.

SET PILOT LINE PRESSURES: NOTE: Refer to SECTION 5 of THIS MANUAL.

18.7

RELIEF VALVE 51055-2

WITH ADJUSTING NUT

1.

Loosen jamnut.

2.

Turn adjusting nut to obtain desired pressure reading on gauge.

3.

Lock jamnut against adjusting nut, making sure the adjusting nut does not turn.

5.

Re-check relief setting.

For complete step-by-step pressure setting procedures of circuits using these relief valves, refer to appropriate sections in THIS MANUAL.

Tigercat M726D Mulcher

Clamps ANTI-CAVITATION RELIEF VALVE

VALVE POPPET

This valve is used as a MAIN and PORT relief valve in the saw, clamp arm, and accumulating arm control valves.

T P

Operation Step 1.

T

STEP 1 PILOT POPPET

‘P’ represents a high pressure area and ‘T’ represents tank. Under normal operation, ‘P’ is below the relief pressures, the valve poppet is firmly seated and oil cannot flow to tank.

T

Step 2.

P

STEP 2

When the pressure at ‘P’ reaches the relief valve setting, the pilot poppet unseats and allows oil in the inner cavity to flow to tank, thus lowering the pressure in the cavity between the pilot poppet and the other poppets.

T SEATING POPPET

Step 3.

T

As a result of the opening of the pilot poppet, the seating poppet moves back, due to the pressure drop caused by oil flow through the bore of the seating poppet, and seats against the pilot poppet. This shuts off the flow of oil through the seating poppet and the cavity pressure now drops to tank pressure.

P

STEP 3

T

Step 4.

VALVE POPPET

T

As the seating poppet began to move away from the valve poppet, the valve poppet began to open under the effect of the pressure at P thus allowing a large volume of flow to tank. The drop in pressure behind the valve poppet when the seating poppet seats on the pilot poppet ensures full opening of the valve poppet.

P

STEP 4

T

Step 5.

When pressure ‘P’ drops the pilot poppet closes and then the seating poppet moves back to its original position and permits oil pressure to flow into the cavity behind the valve poppet. As the seating poppet moves back it comes in contact with the valve poppet and its spring force plus the oil pressure cause the valve poppet to move back to the closed position.

T

VALVE POPPET

P

STEP 5

T CHECK POPPET

As an anti-void or check valve.

The anti-void unit supplies oil to the pressure area ‘P’ when its pressure drops below the pressure in the tank gallery of the valve. The valve then acts as a free flow check valve and prevents cavitation.

In this condition, the pressure at ‘P’ is lower than at ‘T’ and due to the shape of the check poppet, the pressure forces cause the poppet to unseat, allowing oil to flow from ‘T’ to ‘P’.

T P

ANTI-VOID CHECK OPERATION

T 18.8

Tigercat M726D Mulcher SECTION 19 - MULCH DEFLECTOR DOOR MARCH, 2006

CONTENTS - SECTION 19 BOOM LIFT LOCK ........................................................................................ 19.6 BOOM VALVE .............................................................................................. 19.2 CROSS SECTION OF SPOOL SECTION .................................................. 19.3 OPERATING DESCRIPTION ..................................................................... 19.3 CIRCUIT DESCRIPTION ................................................................................ 19.4 CIRCUIT DIAGRAM ....................................................................................... 19.5 CONTROL VALVES ...................................................................................... 19.2 PILOT LINE PRESSURES ............................ SEE SECTION 5 - PILOT SYSTEM PRESSURE SETTINGS ................................................................................ 19.6 RELIEF VALVES .......................................................................................... 19.8 SAFETY ....................................................................................................... 19.6 SPOOL SECTION DIAGRAM ........................................................................ 19.3

Tigercat M726D Mulcher CONTROL VALVES

Mulch deflector door BOOM VALVE

The mulch deflector door circuit is controlled by two solenoid operated pilot valves in the pilot manifold (mulch deflector door) and a pilot operated boom valve.

The boom valve is located on the front chassis above the front axle and behind the cover plate.

One of the four spool sections is used to open and close the mulch deflector door.

For a complete description of the pilot manifold refer to SECTION 5 of THIS MANUAL.

The inlet section receives oil from the fixed displacement boom pump.

For a complete description of the foot operated pilot valve, refer to FOOT CONTROL VALVE in SECTION 8 of THIS MANUAL.

All four spools in the valve are open center type.

Each spool section is pilot operated. An outlet section directs return oil back to tank.

Cartridge type port relief valves are installed in both work ports in the mulch deflector door spool section. The inlet section has a single main relief valve. These reliefs protect the circuits (pumps) from high pressures during operation.

CLAMP ARM SECTION NOT USED FOR MULCHER APPLICATION

TILT • MULCH DEFLECTOR DOOR 'CLOSE' PORT RELIEF (1000 PSI)

•

MULCH DEFLECTOR DOOR

MULCH DEFLECTOR DOOR 'OPEN' PORT RELIEF (1000 PSI)

•

LIFT BOOM INLET GAUGE TEST PORT

•

•

•

MAIN RELIEF (2600 PSI)

INLET SECTION

M724D-02

BOOM CONTROL VALVE - MULCHER ATTACHMENT

19.2

Tigercat M726D Mulcher

Mulch deflector door

OPERATING DESCRIPTION

Shifting the spool(s) directs oil from the fixed displacement Boom/Steer Pump to the mulch deflector door cylinder.

Oil from the fixed displacement boom/steer pump enters the inlet section of the boom valve and is allowed to pass through the open center spool sections and back to tank via the outlet section.

The relief valves installed in the inlet and spool sections of the boom valve protect the pump in case of failure of the POR valve on the pump.

The open centered spools in all of the sections have three positions and are self centering. A spring in the spool end cap holds the spool in the center neutral position.

All of the relief valves on the boom valve divert oil to tank via the tank passages in the spool sections and the outlet section of the boom valve.

They also function as anti-cavitation relief valves.

The spools are shifted one way or the other by pilot oil pressure being applied to either end of the spool.

RELIEF VALVE PORT 'A'

PARALLEL PASSAGE

LOAD CHECK VALVE

A

WORK PORT BRIDGE

RELIEF VALVE PORT 'B'

B

PILOT END CAP

PILOT END CAP SPOOL CENTERING SPRING

SPOOL TANK PASSAGE THRU' NEUTRAL PASSAGE

90136-3

CROSS SECTION OF SPOOL SECTION

19.3

Tigercat M726D Mulcher CIRCUIT DESCRIPTION

Mulch deflector door

The mulch deflector door is operated by a cylinder.

A fixed displacement pump supplies oil to the cylinder via the mulch deflector door spool section in the boom valve.

The mulch deflector door is operated by a 3 position thumb switch OPEN/CLOSE (self centering to OFF) located on the right joystick control. The switch operates two solenoid pilot valves on the pilot manifold which direct pilot oil to the mulch deflector door spool section of the boom control valve, to shift the spool. The spool directs oil from the pump to either end of the mulch deflector door cylinder to open or close the mulch deflector door. Return oil is directed back to tank via the oil cooler and dual head primary return oil filter.

19.4

Tigercat M726D Mulcher

Mulch deflector door

MULCH DEFLECTOR DOOR CIRCUIT M760-058

19.5

Tigercat M726D Mulcher PRESSURE SETTINGS MULCH DEFLECTOR DOOR

Mulch deflector door WARNING

NOTE: Refer to RELIEF VALVE ADJUSTING PROCEDURE in SECTION 18 of THIS MANUAL.

Do not stand above or below the attachment and lift boom or between the boom and front chassis during this procedure while boom is elevated and unsupported.

Before starting this procedure, read the following safety precautions:~ • Never reach between boom crank arms or link arms during machine setup.

• Wear safety glasses and safety shoes when working on shears.

• Keep mulch deflector door closed whenever possible during setup.

• Mulch deflector door opens and closes very rapidly, always keep clear of operating area.

• Do not stand on top or inside of boom arms.

NOTE: This procedure assumes that a Fecon BH250 mulching head is used. Refer to illustration of BOOM CONTROL VALVE on page 2 for orientation and pressure value references .

1. Park machine on level ground. Completely raise lift boom and install lift boom cylinder lock over one of the two cylinder rods with the open side at the bottom and wide end up against the keeper plate bolt heads. Install retaining bolt and locknut through center hole. Slowly lower boom until lock is securely held in place.

TO SET MULCH DEFLECTOR DOOR OPEN AND CLOSE RELIEF VALVES:3. Connect a 0 - 5000 psi pressure gauge (with at least 4' of hose) to the inlet test port on of the boom control valve.

4. Turn the boom inlet main relief adjusting screw all the way IN. 5. Turn the port relief valve adjusting screws on the mulch deflector door spool section of the control valve OUT until spring pressure is relieved then turn adjusting screws one full turn IN. 6. Start the engine, and put the throttle control to the IDLE position.

7. Ensure that the hydraulic oil temperature is between 120°F - 140°F.

IMPORTANT During the following procedures, DO NOT hold ANY function control for LONGER THAN 5 SECONDS.

WARNING

IMPORTANT Avoid blowing oil over relief longer than 5 seconds, as excessive heating of hydraulic fluid and damage to boom pump can occur.

Always install boom lift lock before working on or around machine with boom raised.

• Always install 'T' handle retainer bolt • Use only to support boom and cutting head • Do not use to set hydraulics pressures

IMPORTANT Approach the gauge reading slowly and deliberately by turning the adjusting screw in a little at a time. The pressure setting must not exceed the above value.

2. Set parking brake ON. Install articulation lock bar, block wheels and stop engine.

WARNING To prevent injury caused by accidental steering of the machine when setting pressures, make sure the articulation lock bar is held securely in place by the lynch pins provided.

19.6

Tigercat M726D Mulcher

Mulch deflector door

8. While holding the right joystick thumb switch to the left in the MULCH DOOR OPEN position (mulch deflector door cylinder fully retracted), check gauge pressure reading.

If less than 1000psi, stop engine and readjust mulch deflector door open port relief. Repeat above procedure until a gauge reading of 1000 psi is obtained.

9. While holding the right joystick thumb switch to the right in the MULCH DOOR CLOSE position (mulch deflector door cylinder fully extended), check gauge pressure reading.

If less than 3200 psi, stop engine and readjust mulch deflector door close port relief. Repeat above procedure until a gauge reading of 3200 psi is obtained.

10. Stop engine, unscrew inlet main relief adjusting screw 3 full turns.

11. Start engine and move the throttle control to the FULL position.

IMPORTANT Never run engine at full throttle with main relief turned all the way in.

12. While holding the joystick thumb switch in the MULCH DOOR OPEN position, check gauge pressure reading.

If less than 2600 psi, stop engine and readjust inlet main relief. Repeat above procedure until a gauge reading of 2600 psi is obtained.

13. Remove pressure gauge and wipe up any excess oil from test port area.

SET PILOT LINE PRESSURES: NOTE: Refer to SECTION 5 of THIS MANUAL.

19.7

Tigercat M726D Mulcher

Mulch deflector door ANTI-CAVITATION RELIEF VALVE

VALVE POPPET

This valve is used as a MAIN and PORT relief valve in the boom control valve and the steer control valve.

T P

Operation Step 1.

‘P’ represents a high pressure area and ‘T’ represents tank. Under normal operation, ‘P’ is below the relief pressures, the valve poppet is firmly seated and oil cannot flow to tank.

T

STEP 1 PILOT POPPET

T

Step 2.

P

STEP 2

T SEATING POPPET

Step 3.

T P

STEP 3

As a result of the opening of the pilot poppet, the seating poppet moves back, due to the pressure drop caused by oil flow through the bore of the seating poppet, and seats against the pilot poppet.

This shuts off the flow of oil through the seating poppet and the cavity pressure now drops to tank pressure.

Step 4.

T VALVE POPPET

When the pressure at ‘P’ reaches the relief valve setting, the pilot poppet unseats and allows oil in the inner cavity to flow to tank, thus lowering the pressure in the cavity between the pilot poppet and the other poppets.

T P

As the seating poppet began to move away from the valve poppet, the valve poppet began to open under the effect of the pressure at P thus allowing a large volume of flow to tank. The drop in pressure behind the valve poppet when the seating poppet seats on the pilot poppet ensures full opening of the valve poppet.

Step 5.

STEP 4

T VALVE POPPET

T P

When pressure ‘P’ drops the pilot poppet closes and then the seating poppet moves back to its original position and permits oil pressure to flow into the cavity behind the valve poppet. As the seating poppet moves back it comes in contact with the valve poppet and its spring force plus the oil pressure cause the valve poppet to move back to the closed position.

As an anti-void or check valve.

STEP 5

T CHECK POPPET

T P

ANTI-VOID CHECK OPERATION

The anti-void unit supplies oil to the pressure area ‘P’ when its pressure drops below the pressure in the tank gallery of the valve. The valve then acts as a free flow check valve and prevents cavitation. In this condition, the pressure at ‘P’ is lower than at ‘T’ and due to the shape of the check poppet, the pressure forces cause the poppet to unseat, allowing oil to flow from ‘T’ to ‘P’.

T 19.8

Tigercat M726D Mulcher

Mulch deflector door ANTI-CAVITATION RELIEF VALVE ADJUSTING PROCEDURE For relief valve with adjusting screw

ANTI-CAVITATION RELIEF VALVE ADJUSTING PROCEDURE For relief valve with adjusting nut ADJUSTING NUT

•

JAMNUT

ADJUSTING SCREW

•

JAMNUT

• •

RELIEF VALVE 51055-2

RELIEF VALVE

WITH ADJUSTING NUT

51055-20

WITH ADJUSTING SCREW

1.

Loosen jamnut.

1.

Loosen jamnut.

2.

Turn adjusting nut to obtain desired pressure reading on gauge.

2.

Turn adjusting screw to obtain desired pressure reading on gauge.

3.

Lock jamnut against adjusting nut, making sure the adjusting nut does not turn.

3.

5.

Re-check relief setting.

Lock jamnut against relief valve body, making sure the adjusting screw does not turn.

5.

Re-check relief setting.

For complete step-by-step pressure setting procedures of circuits using these relief valves, refer to appropriate sections in THIS MANUAL.

For complete step-by-step pressure setting procedures of circuits using these relief valves, refer to appropriate sections in THIS MANUAL.

19.9

Tigercat M726D Mulcher

Mulch deflector door

19.10