Tigercat 726B FELLER BUNCHER SERVICE MANUAL - PDF DOWNLOAD

SERVICE MANUAL Tigercat 726B FELLER BUNCHER ISSUE 2.2, MARCH 2003 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 .................................................................................................................. 10 STEERING AND CENTER JOINT ................................................................................... 11 LIFT BOOM ..................................................................................................................... 12 TILT ................................................................................................................................. 13 SAW DRIVE .................................................................................................................... 17 CLAMPS WITH SAW ...................................................................................................... 18 SHEAR WITH CLAMPS .................................................................................................. 19 726bsm00

Tigercat

726B Available Literature Operator's Manual ................................. Part No. 9228A Service Manual (This Manual) .............. Part No. 9229A Parts Catalog ......................................... Part No. 9230A Hydraulic Adapters Book ....................... Part No. 1472A Hose Assemblies Book ......................... Part No. 3707A

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

Fax: (519) 442-1855

Tigercat 726B Feller Buncher

Introduction

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Tigercat 726B Feller Buncher

Introduction

Tigercat 726B Feller Buncher

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 726B Feller Buncher serial number 7261001 and up.

The operator's manual will assist the operator with the techniques of proper and safe operation of the 726B Feller Buncher. There is also important information regarding the safe operation of the saw 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 Company reserves the right to change information contained herein at any time without prior notice.

Tigercat Industries Inc.

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Tigercat 726B Feller Buncher

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 modification(s) 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 posibility 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 726B Feller Buncher

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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Tigercat 726B Feller Buncher

Introduction

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Tigercat 726B Feller Buncher

SECTION 1 - SAFETY CONTENTS - SECTION 1 ARTICULATION LOCK PIN ........................................................................... 1.9 BOOM LIFT LOCK ....................................................................................... 1.10 FIRE PREVENTION FIRE PREVENTION GUIDELINES ........................................................... 1.11 WHAT ELSE TO DO BEFORE YOU EXPERIENCE A FIRE .................... 1.12 WHAT TO DO AFTER A FIRE ................................................................. 1.13 WHAT TO DO IN CASE OF A MACHINE FIRE ........................................ 1.12 INTERLOCK SWITCHES ON DOORS .......................................................... 1.7 PARKING THE MACHINE ............................................................................. 1.6 SAFETY PRECAUTIONS, GENERAL ........................................................... 1.3 SAFETY PRECAUTIONS, OPERATING ....................................................... 1.5 SAFETY PRECAUTIONS, SERVICING ......................................................... 1.8 SAFETY SYMBOLS ....................................................................................... 1.2

MARCH 2003

Tigercat 726B Feller Buncher

Safety

SAFETY SYMBOLS

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

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

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

IMPORTANT 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 726B Feller Buncher

Safety

GENERAL SAFETY PRECAUTIONS

KEEP BACK 500 FEET

Remember that safety is a prime responsibility of all.

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

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.

Always avoid the discharge side of a felling sawhead. A sawhead's high-velocity discharge of debris requires a safe separation distance.

Study all the safety messages in this manual and on the labels on the machine carefully.

Follow all instructions from safety inspector and supervisors.

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.

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.

Use the handrails and steps provided when mounting and dismounting from the machine. Do not climb onto or jump off the machine at any time. Do not use the joysticks as a handle when entering or leaving the cab.

Do not let an untrained person operate the machine.

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

Use recommended protective clothing and safety devices such as 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.

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.

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Tigercat 726B Feller Buncher

Safety 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.

GENERAL SAFETY PRECAUTIONS continued

Maintain a distance of 10 ft. (3m) between the machine or boom and any power line carrying up to 50,000 volts or less.

Power lines carrying more than 50,000 volts require a safety distance of 10 ft. (3m) plus 1/2 inch (10mm) for each addition 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.

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.

Machine should be washed completely at every major service.

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 pin 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 felling head manufacturer.

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

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.

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.

Inspect the machine daily for signs of damage, unusual wear, fluid leaks, or faulty operation.

Repair or replace malfunctioning parts and systems immediately.

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

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

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.

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Tigercat 726B Feller Buncher

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.

Before starting the engine, check to ensure that all doors, panels, and access covers are installed properly and secured.

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

Make sure that all of the controls are positioned as specified in the starting instructions in the operator's manual.

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

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

Sound the machine horn before starting the machine.

Never use the parking brake to slow down or stop the machine except in an emergency. Keep the brake properly adjusted at all times.

The operator s seat is equipped with lap and shoulder harness belts. Use this restraint system at all times when operating the machine.

Always rest the felling attachment on the ground when operation is stopped, regardless if the engine is running or shut off.

Start the engine according to the instructions in this manual.

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

Felling operations should only be performed from the operator's seat. Secure loose items in the cab.

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Tigercat 726B Feller Buncher

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

OPERATING SAFETY PRECAUTIONS continued

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

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

When parking the machine:

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

Park on level ground only and engage the parking brake.

Do not park on a hillside or incline.

Lower felling attachment onto level ground.

Stop the engine and relieve any hydraulic pressure stored in the system by pressing the brake pedal 30 to 40 times.

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

Use only prearranged and approved signalling practices.

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

Do not carry passengers either in the cab or anywhere else on the machine.

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

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

NEVER travel across a STEEP slope or side hill:

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

As logs are added to the accumulator pocket the handling and the stability of the machine will change.

Always be prepared to dump the load in case of an emergency.

Do not overload the machine as this can create an unstable condition and cause a rollover.

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.

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.

CAUTION

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

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.

Read, understand and follow all operating safety precautions specified by felling head manufacturer.

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Tigercat 726B Feller Buncher

Safety

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

SWITCH

ACTUATOR

197-5

INTERLOCK SWITCH (L.H. DOOR SHOWN)

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

To operate: Close both doors and press the pilot reset switch.

NOTE: 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 will become the responsibility of the operator.

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

1.7

Tigercat 726B Feller Buncher

Safety

SERVICING SAFETY PRECAUTIONS

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.

Never use your bare hand to check for fluid leaks.

Conduct maintenance inspections at least as frequently as recommended in section 3 of the operator's manual.

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

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.

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

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

Pressure can be maintained in a hydraulic system long after the power source and pump have been shut down. Stop engine lower the felling head to the ground and relieve trapped pressure (from two accumulators) by operating brake pedal 30 or more times while operating both joysticks several times before performing work on components, or disconnecting any hoses.

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

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 current does not pass through bearings, especially the center joint bearing. Also, disconnect the positive (+) battery cable from both batteries.

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Tigercat 726B Feller Buncher

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.

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.

Safety

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 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.

195-24A

FRAME ARTICULATION LOCK PIN

Before working in the centre joint area, install the frame articulation lock pin between the frames to prevent accidental articulation and injury.

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

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Tigercat 726B Feller Buncher

Safety

SERVICING SAFETY PRECAUTIONS continued WARNING If the engine is running inside a building, ensure that sufficient ventilation is available to prevent a build-up of toxic exhaust fumes. Run the engine only when it is necessary for testing or adjustments.

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 felling head.

Do not use to set hydraulics pressures.

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.

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.

WARNING Dispose of fluids properly.

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

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

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

Read, understand and follow all operating safety precautions specified by felling head manufacturer.

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Tigercat 726B Feller Buncher

Safety dislodged by vibration this smoldering debris can fall into other areas of the machine and thereby spread a fire.

FIRE PREVENTION

5. 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.

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. 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. 4. 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

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

7. 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.

8. 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.

9. Shut down equipment immediately when a problem is suspected or smoke is detected.

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

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

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

13. 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.

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

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

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

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

1.11

Continued on page 12

Tigercat 726B Feller Buncher FIRE PREVENTION continued

Safety 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.

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

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

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

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 open the access panels to the machine, in the area of the fire, do so.

Continued from page 11

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.

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

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

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

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

Use the PASS method with most extinguishers.

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. *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.

1.12

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.

Tigercat 726B Feller Buncher

Safety WHAT TO DO AFTER A FIRE

FIRE PREVENTION continued

20229A

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.

TYPICAL FIRE EXTINGUISHER ACCESS HOLE

If you are unable to open the access door(s), but can safely reach the 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.

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.

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Tigercat 726B Feller Buncher

Safety

1.14

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

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using high speed disc saws safely FORWARD:

Tigercat

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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

Tigercat

®

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.

3

using high speed disc saws safely

Tigercat

®

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.

4

using high speed disc saws safely

Tigercat

®

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.

8

using high speed disc saws safely

Tigercat

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

®

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.

Tigercat

®

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.

Tigercat

®

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.

Tigercat

®

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.

Tigercat

®

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.

15

using high speed disc saws safely

Tigercat

16

®

Tigercat 726B Feller Buncher

Lubrication and Maintenance

Tigercat 726B Feller Buncher

SECTION 3 - LUBRICATION & MAINTENANCE APRIL 2000

CONTENTS - SECTION 3 CHECKING THE AIR CONDITIONING SYSTEM ............................................. 14 FILTERS FUEL FILTER/WATER SEPARATOR ............................................................... 10 FUEL TANK STRAINER .................................................................................. 10 HYDRAULIC OIL RETURN FILTERS .............................................................. 11 HYDROSTATIC CHARGE P.UMP PRESSURE FILTER ................................. 11 GENERAL MAINTENANCE ................................................................................. 3 HYDRAULIC OILS ................................................................................................ 7 NEW MACHINE MAINTENANCE FIRST 50-100 HOUR INSPECTION AND SERVICE REPORT ......................... 2 INITIAL PRE-DELIVERY INSPECTION ............................................................ 2 TIGHTENING POINTS ..................................................................................... 2 PRESSURE SETTINGS WITH 18" SAW, KOEHRING WATEROUS ................................................................. 21 20" SAW, KOEHRING WATEROUS ................................................................. 22 BUNCHING SHEAR, TIGERCAT .................................................................... 18 DW5000 (19") TIGERCAT BUNCHING SAW .................................................. 19 DW5600 (22") TIGERCAT BUNCHING SAW .................................................. 20 SCHEDULED MAINTENANCE 1000 HOURS .................................................................................................... 6 125 HOURS ...................................................................................................... 5 2000 HOURS .................................................................................................... 6 250 HOURS ...................................................................................................... 5 500 HOURS ...................................................................................................... 6 8 HOURS .......................................................................................................... 4 FREQUENTLY .................................................................................................. 4 SEASONAL ...................................................................................................... 7 SERVICE AND LUBRICATION POINTS CHART ................................................. 9 STARTUP PROCEDURE AFTER MAJOR MACHINE MAINTENANCE ............. 12 TORQUE CHART ............................................................................................... 16 TORQUE CHART, GENERAL ............................................................................ 17 WHEELS, INSTALLING ........................................................................................ 2

3.1

Tigercat 726B Feller Buncher

Lubrication and Maintenance

PREVENTIVE MAINTENANCE SCHEDULE FOR 726B FELLER BUNCHER _______________________________________________________________________________________

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:-

IMPORTANT!

THE FIRST 50-100 HOUR INSPECTION REPORT:~

__________________________________________

WHEELS: 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.

ALL HYDRAULIC CONNECTIONS HOSE CLAMPS CENTER JOINT PIN SECURING BOLTS TRANSMISSION SECURING BOLTS

FOR ADDITIONAL INSTRUCTIONS ALSO REFER TO SECTION 8 OF THE SERVICE MANUAL.

ENGINE MOUNTING BOLTS PUMP DRIVE GEARBOX SECURING BOLTS

__________________________________________ HOUR METER ~ MAINTENANCE: CHECK THE HOUR METER ON A REGULAR BASIS TO DETERMINE YOUR SCHEDULED MAINTENANCE TIMES.

AXLE MOUNTING BOLTS WHEEL RETAINING BOLTS 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

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

IF YOUR MACHINE IS BEING OPERATED IN DIFFICULT OR SEVERE CONDITIONS, YOU SHOULD SERVICE YOUR MACHINE AT SHORTER INTERVALS.

REFER TO DIESEL ENGINE SERVICE MANUAL AND ATTACHMENT MANUAL FOR ADDITIONAL REQUIRED MAINTENANCE AT THIS SCHEDULED TIME PERIOD.

_______________________________________________________________________________________

_______________________________________________________________________________________ 3.2

Tigercat 726B Feller Buncher

Lubrication and Maintenance

GENERAL

CAUTION ALL HANDLES, STEPS AND PLATFORMS MUST BE KEPT FREE OF GREASE, OIL, FUEL, MUD, SNOW AND ICE TO PREVENT RISK OF PERSONAL INJURY. þ CLEAN AROUND FILLER CAPS BEFORE CHECKING OR ADDING FLUIDS

þ BEFORE WELDING ON MACHINE BE SURE MASTER SWITCH IS DISCONNECTED

þ RELEASE HYDRAULIC PRESSURES AND CLEAN AROUND HYDRAULIC FITTINGS BEFORE BREAKING CONNECTION. PLUG OR CAP IMMEDIATELY

þ WHEN WELDING SECURE GROUND CONNECTION AS CLOSE TO WORKING POSITION AS POSSIBLE TO PREVENT ARCING ACROSS MACHINED SURFACES OR THROUGH BEARINGS

þ CLEAN UP SPILLS AS SOON AS POSSIBLE

þ CLEAN AWAY ALL BRANCHES, BARK AND CHIPS. CLEAN UP ALL TRACES OF OIL TO AVOID FIRES

þ ALWAYS USE CLEAN OIL AND CONTAINERS þ DRAIN DIRTY OIL WHILE STILL WARM

þ ALWAYS HAVE A FIRE EXTINGUISHER AT HAND

þ DO NOT EXCEED RECOMMENDED FLUID LEVELS

þ FOR SAFETY, ALWAYS LOWER BOOM ASSY TO THE GROUND WHEN LEAVING CAB, LEAVING MACHINE UNATTENDED OR DURING SERVICE

þ SERVICE ALL HYDRAULIC FILTERS AFTER THE FAILURE OF A PUMP, MOTOR, CYLINDER OR VALVE. FAILURES OF THIS NATURE COULD CONTAMINATE THE ENTIRE HYDRAULIC SYSTEM

þ 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)

þ TOP UP DIESEL FUEL AT END OF EACH SHIFT TO REDUCE CONTAMINATION BY CONDENSATION

______________________________________________

þ CLEAN UP OIL SPILLS ON WALKING SURFACES AND TOP OF ENGINE ENCLOSURE IMMEDIATELY

3.3

Tigercat 726B Feller Buncher

Lubrication and Maintenance

SCHEDULED MAINTENANCE • LUBRICATE TILT AND LIFT CYLINDER ENDS, 8-FITTINGS, PURGE • LUBRICATE LIFT BOOM AND TILTLINKAGE, 9-FITTINGS, PURGE

FREQUENTLY:~ • CHECK ENGINE COOLING AIR INTAKE SCREENS FOR POSSIBLE RESTRICTION

CLEAN:~

______________________________________________

• POTENTIALLY DAMAGING LIMBS OR STICKS FROM MACHINE • AIR CONDITIONER CONDENSOR, OIL COOLER AND RADIATOR

EVERY 8 HOURS (EVERY SHIFT):~

CHECK:~ • FOR LEAKAGE AROUND HYDRAULIC COMPONENTS AND FLEXIBLE HOSES

• PERFORM "FREQUENTLY" MAINTENANCE CHECK, AND IN ADDITION:~

• FOR LOOSE NUTS, BOLTS AND FITTINGS

• CHECK ENGINE COOLANT LEVEL

• CONDITION AND TENSION OF FAN BELTS.

• CHECK ENGINE OIL LEVEL

• WATER PRESSURE GAUGE IN CAB (60 PSI) FOR PRESSURIZED WATER SYSTEM.

• DRAIN FUEL/WATER SEPARATOR • CHECK AIR INTAKE PRECLEANER, CLEAN AS REQUIRED

IF THE WATER SYSTEM HAS BEEN OPERATED, REFER TO SECTION 2 IN THIS MANUAL FOR REFILLING AND CHARGING INSTRUCTIONS.

• CHECK AIR CLEANER UNLOADER VALVE • CHECK ENGINE AIR FILTER RESTRICTION INDICATOR

• CONDUCT AN OVERALL VISUAL INSPECTION. REFER TO DIESEL ENGINE SERVICE MANUAL AND ATTACHMENT MANUAL FOR ADDITIONAL REQUIRED MAINTENANCE AT THIS SCHEDULED TIME PERIOD.

• CHECK HYDRAULIC OIL LEVEL • CHECK PUMP DRIVE GEARBOX OIL LEVEL WITH DIPSTICK • CHECK TRANSMISSION OIL LEVEL AT DIPSTICK

______________________________________________

• LUBRICATE AXLES ~ OUTER BEARINGS 1 FITTING, 4-PLACES, PURGE • LUBRICATE MID DRIVE SHAFT SLIP JOINT* 1-FITTING, LUBRICATE UNTIL GREASE FLOWS OUT PAST OUTER BEARINGS *NOTE: LUBRICATE MID DRIVE SHAFT SLIP JOINT WITH MACHINE ARTICULATED • LUBRICATE FRONT DRIVE SHAFT SUPPORT BEARING, 1-FITTING, PURGE • LUBRICATE CENTER JOINT BEARINGS, 2-FITTINGS, PURGE • LUBRICATE STEERING CYLINDER ENDS, 4-FITTINGS, PURGE

3.4

Tigercat 726B Feller Buncher

Lubrication and Maintenance

SCHEDULED MAINTENANCE EVERY 125 HOURS:~

EVERY 250 HOURS:~

• PERFORM "FREQUENTLY" MAINTENANCE

• PERFORM "FREQUENTLY" MAINTENANCE

• PERFORM 8 HOUR MAINTENANCE

• PERFORM 8 HOUR MAINTENANCE

AND IN ADDITION:~

• PERFORM 125 HOUR MAINTENANCE

• LUBRICATE REAR AXLE PIVOT, 2-FITTINGS, PURGE

AND IN ADDITION REPLACE:~

• LUBRICATE REAR DRIVE SHAFT SLIPJOINT 1-FITTING, PURGE

• ENGINE FUEL FILTER

CHECK:-

• FUEL/WATER SEPARATOR

• FLUID LEVEL IN BATTERIES UNLESS MAINTENANCE FREE

• AIR INTAKE PRIMARY ELEMENT

• ENGINE R.P.M.

• OIL IN TRANSMISSION

• HYDRAULIC PUMP AND MOTOR SECURING BOLTS

REFER TO DIESEL ENGINE SERVICE MANUAL AND ATTACHMENT MANUAL FOR ADDITIONAL REQUIRED MAINTENANCE AT THIS SCHEDULED TIME PERIOD.

• ENGINE OIL AND CHANGE OIL FILTER

• OIL IN PUMP DRIVE GEARBOX

• CHECK FUEL TANK FILLER SCREEN • TORQUE TIGHTENING POINTS AS PER NEW MACHINE MAINTENANCE

______________________________________________

• PROPER OPERATION OF PRESSURIZED WATER SYSTEM. (REFER TO SECTION 2 IN THE OPERATOR'S MANUAL) VISUALLY CHECK FOR DAMAGE TO:• LIFT BOOM AND TILT LINKAGE • FRONT AND REAR FRAME • CENTER JOINT AREA Continued on page 6

• ATTACHMENT MAKE REPAIRS IMMEDIATELY VISUALLY INSPECT FOR:• FRAYED ELECTRICAL WIRING AND HYDRAULIC HOSES • WEAR IN ANY OTHER COMPONENTS CLEAN/REPLACE:• AIR CONDITIONER RE-CIRCULATION FILTER IN CAB • CAB FRESH AIR FILTER • CLEAN BETWEEN RAD AND OIL COOLER. REFER TO DIESEL ENGINE SERVICE MANUAL AND ATTACHMENT MANUAL FOR ADDITIONAL REQUIRED MAINTENANCE AT THIS SCHEDULED TIME PERIOD. _____________________________________________ 3.5

Tigercat 726B Feller Buncher

Lubrication and Maintenance

SCHEDULED MAINTENANCE Continued from page 5

EVERY 1000 HOURS:~

EVERY 500 HOURS:~

• PERFORM "FREQUENTLY" MAINTENANCE • PERFORM 8 HOUR MAINTENANCE

• PERFORM "FREQUENTLY" MAINTENANCE

• PERFORM 125 HOUR MAINTENANCE

• PERFORM 8 HOUR MAINTENANCE

• PERFORM 250 HOUR MAINTENANCE

• PERFORM 125 HOUR MAINTENANCE

• PERFORM 500 HOUR MAINTENANCE

• PERFORM 250 HOUR MAINTENANCE

AND IN ADDITION REPLACE:~

AND IN ADDITION REPLACE:~ • AIR INTAKE SAFETY ELEMENT

• REPLACE ENGINE AIR CLEANER UNLOADER VALVE

• CHARGE PRESSURE FILTER

CHECK:~

†

• HYD. OIL RETURN FILTER, TRAV./STEER • HYD. OIL RETURN FILTERS, SAW/BOOM • HYD. OIL RETURN FILTER, PILOT

†

• CENTER JOINT PIVOT BEARING

†

• ACCUMULATOR CHARGE VALVE STRAINER

†

• TRANSMISSION LUBE PUMP PRESSURE

• LUBRICATE PARKING BRAKE BY APPLYING GENERAL PURPOSE GREASE WITH A BRUSH TO BOTH SIDES OF SLIDE AND CLEVIS PIN ON HANDLE

REFER TO DIESEL ENGINE SERVICE MANUAL AND ATTACHMENT MANUAL FOR ADDITIONAL REQUIRED MAINTENANCE AT THIS SCHEDULED TIME PERIOD. ______________________________________________

CHECK:~ • ALL HYDRAULIC PRESSURES • TRANSMISSION MOUNTING; CHECK, RE-TORQUE

EVERY 2000 HOURS:~

• TRANSMISSION MOUNTING • PARKING BRAKE, REFER TO SECTION 2 OF OPERATOR'S MANUAL

• PERFORM 8 HOUR MAINTENANCE

• PERFORM "FREQUENTLY" MAINTENANCE

• PERFORM 125 HOUR MAINTENANCE • PERFORM 250 HOUR MAINTENANCE

REFER TO DIESEL ENGINE SERVICE MANUAL AND ATTACHMENT MANUAL FOR ADDITIONAL REQUIRED MAINTENANCE AT THIS SCHEDULED TIME PERIOD.

• 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 • STRAINER IN ACCUMULATOR CHARGE VALVE REFER TO DIESEL ENGINE SERVICE MANUAL AND ATTACHMENT MANUAL FOR ADDITIONAL REQUIRED MAINTENANCE AT THIS SCHEDULED TIME PERIOD.

† Use only Genuine Tigercat replacement hydraulic oil filters.

3.6

Tigercat 726B Feller Buncher

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 SECTION 2 IN THE OPERATOR'S MANUAL)

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 726B Feller Buncher

Lubrication and Maintenance

OUTER AXLE BEARINGS

ATTACHMENT

21

REF / 8

1

4 FTG / 8

4

•

• •

7

•

• •

• • •• •

• •• •

•

5 6

12

• •

22

•

•

•

8

•

13 14

•

15 19 STEER CYLINDERS

2 FTG / 125

4 FTG / 8 BOOM PINS

AXLE OSCILLATION

DOOR/SCREEN HINGES

10 FTG / 8

8 FTG / 500 24 17

BOOM PINS

8 FTG / 8

•

•

• •

• •

•

• •

10 11

9

•

•

15

• •

• •

•

5 6

•

• •

•

•

• •

•

1

• •

•

2

•

• •

• •

•

•

•

4 23 18

18

2 FTG / 8

REAR DRIVE SHAFT

MID DRIVE SHAFT ***

CENTER JOINT

3

2 FTG / 8

20

22

1 FTG / 125

LEGEND

*** 2 FTG/125

STEER MACHINE FULLY BEFORE GREASING THE MID DRIVESHAFT SLIP YOKE LUBRICATION POINT WITH A DESIGNATED NUMBER OF FITTINGS (2 FTG) AND HOURS BETWEEN SERVICING (125 ).

JOINT TO BE PURGED USE LITHIUM BASED EP2 GREASE CONTAINING MOLYBDENUM DISULFIDE 3.8

....... HOURS CHK ..... CHECK REP ..... REPLACE DRN .... DRAIN D/R ...... DRAIN AND REFILL LUB ..... LUBRICATE

Tigercat 726B Feller Buncher

Lubrication and Maintenance

Tigercat Model 726B SERVICE AND LUBRICATION POINTS ®

REFER TO TIGERCAT OPERATOR'S MANUAL FOR FURTHER INFORMATION

SCREENS (COOLING SYSTEM)

CHK

2 3

CENTRE JOINT PIVOT

LUB CHK CHK

5

ENGINE OIL AND FILTER CATERPILLAR CUMMINS FUEL FILTER

REP

6

FUEL WATER SEPARATOR

REP

7

FUEL CAP SCREEN

4

8 9

REP †

HYDRAULIC OIL FILTER 14 PILOT

REP †

4 5

REP

CHK

REP †

1

REP †

2

REP †

1

REP †

1 4.0

1.1

TRANSMISSION

D/R

8.2

2.2

50 28

13.2 7.4

D/R D/R CHK

AXLES: FRONT REAR

PRESSURIZED WATER SYSTEM ACCUMULATOR CHARGE 23 VALVE STRAINER 22

A/C HEATER FILTERS

QTY.

1000

500

2000

1 DRAIN TANK, CLEAN OR REPLACE AS NECESSARY CHECK RESTRICTION INDICATOR ON INTAKE PIPE AT FULL ENGINE RPM. 1 CLEAN UNLOADER VALVE EVERY 8 HOURS. REPLACE VALVE EVERY 1000 HOURS. 1

D/R

ATTACHMENT

SEE MANUFACTURER'S 1 MAINTENANCE MANUAL 1 1

1 CLEAN OR REPLACE AS NECESSARY

CHK REP

D/R D/R CHK

D/R 257

PARKING BRAKE

24

15 18.9

CHECK MOTION BETWEEN CHASSIS LUGS

1

68

LUB CHK TEST

D/R REP

CHK

CHECK RESTRICTION INDICATOR ON FILTER HEAD AT FULL ENGINE RPM

CHECK LEVEL WITH DIPSTICK. FILL WITH MIL-L-2105C OR API-GL-5 75W FOR BELOW -10°F(-23°C) 80W-90 FOR UP TO 100°F(38°C) 85W-140 FOR ABOVE 100°F(38°C) 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 REFER TO SECTION 2 OF OPERATOR'S MANUAL APPLY G.P. GREASE WITH BRUSH TO BOTH SIDES OF SLIDE & CLEVIS PIN ON HANDLE SEE ATTACHMENT MANUFACTURER'S MANUAL CHECK SYSTEM PRESSURE , 60PSI REFER TO SECTION 2 OF OPERATOR'S MANUAL

CHK LUB

20 21

250 REP REP REP

HYDRAULIC DRIVE CHARGE REP PRESSURE FILTER † PUMP DRIVE GEARBOX D/R D/R CHK

19 HYDRAULIC RESERVOIR

MIXTURE 50% DISTILLED WATER 50% ANTIFREEZE (GM 6035M SPEC.)

2

CHK

HYDRAULIC OIL FILTER 13 BOOM/SAW

18

CHK

CHK

AIR INTAKE PRECLEANER

DESCRIPTION

CLEAN SCREENS AND COOLING CORES(3) SEE SECTION 2 OF OPERATOR'S MANUAL

INTANK FUEL STRAINER

REP †

17

8.5

CHK

AIR INTAKE PRIMARY FILTER ELEMENT AIR INTAKE SAFETY 11 FILTER ELEMENT HYDRAULIC OIL FILTER 12 TRAVEL/STEER

16

32

DRN

10

15

US GAL

CHK

125

8

250

COOLING SYSTEM

1

CAPACITY

LITER

SERVICE EVERY

ITEM 25

SERVICE POINT NO.

FIRST

1 CLEAN OR REPLACE AS NECESSARY

† Us e only Ge nuine Tige rcat re place me nt Hydraulic oil filte rs .

3.9

Tigercat 726B Feller Buncher FILTERS - REMOVE AND REPLACE

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

FUEL FILTER/WATER SEPARATOR

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

IMPORTANT

clean fuel.

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.

NOTE: (For Cummins engine only, for Caterpillar engine see manufacturer's operation and maintenance manual)

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

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.

7. Clean the water sediment bowl.

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.

Changing or cleaning the strainer: 1. Park machine on level ground, install articulation lock pin, 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.

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

4. Wearing face protection (in case of a fuel squirt) turn OFF the fuel shut-off valve on the side of the fuel tank and unscrew the old filter.

13. Turn the fuel shut-off valve ON, start the engine and check for leaks.

FUEL TANK STRAINER

This 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.

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

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.

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

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

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

7. Reinstall the strainer using the hex on end.

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

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

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. It is plastic and will break if over tightened.

Close the water drain valve.

3.10

Tigercat 726B Feller Buncher

Lubrication and Maintenance

HYDRAULIC OIL RETURN FILTERS

HYDROSTATIC CHARGE P.UMP PRESSURE FILTER

There are four identical full flow filters mounted on filter heads with built-in bypasses. One is in the travel/steer return line, two are in the boom/saw return line, on a dual head and one is in the pilot return line. For service and replacement intervals see SERVICE AND LUBRICATION CHART in THIS SECTION.

This single full flow filter, is mounted in the output side of the hydrostatic charge pump.

For service and replacement intervals see SERVICE AND LUBRICATION CHART in THIS SECTION. Changing the filter:

Changing the filters:

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

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

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

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

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

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

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

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

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

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

6. The new filter has two gaskets enclosed.

Use ONLY the square gasket. Discard the round gasket, as it is used only on the earlier models.

7. Lubricate the new square gasket with clean hydraulic oil and install in to the groove in the filter head.

6. The new filter has an attached gasket.

Prefill the new filter with clean hydraulic oil and apply hydraulic oil to the gasket surface.

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

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

9. Start the engine and check for leaks.

8. Prefill the new filter with clean hydraulic oil and screw on to the filter head until it makes contact with the gasket in the filter head.

9. Hand tighten filter an additional 3/4 turn only.

IMPORTANT

10. Start the engine and check for leaks.

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.

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. Only Tigercat replacement filters must be used.

Do not substitute with other cheaper inferior brands. Tests have shown that Tigercat filters can have up to twice the filtering capacity as that of other name brands.

3.11

Tigercat 726B Feller Buncher STARTUP 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.

Lubrication and Maintenance MACHINE STARTUP Before beginning this procedure, perform the PRE-STARTUP AND FILLING steps.

NOTE: When the saw head is attached, retorque all teeth (See saw manual). Attach the SAW BLADE GUARD and insert the SAW BLADE LOCKING PIN.

CAUTION

PRE-STARTUP AND FILLING 1. Ensure all filters are in place and pre-fill hydrostatic drive charge pump pressure filter.

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

2. Check oil levels in the engine, the pump drive gearbox and the transmission.

1. Ensure the articulation lock pin is installed.

2. Cummins engine - disconnect red and white wires on injector pump solenoid (prevents engine starting).

3. Check coolant level in the radiator.

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

Caterpillar engine - disconnect 2 black wires on lower screw on injector pump solenoid (prevents engine starting).

5. Install the articulation lock pin and apply the parking brake.

6. Turn both differential lock switches to OFF.

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

7. At the pilot manifold, turn adjusting screws OUT on both the pressure reducing valve and the pressure relief valve.

8. Do not start engine. Purge air from hydraulic system by adding oil as follows; •

Prepare the hand fill pump on the machine to add hydraulic oil. Clean the fill line pipe, remove cap on end of pipe and insert pipe into oil supply drum.

•

Loosen plugs on top of the two suction tubes on side of oil reservoir.

•

Operate the hand fill pump at medium speed, using a steady motion.

•

Watch for oil leaking from the lower suction tube plug that was loosened previously and tighten this plug when oil leaks out. Continue pumping slowly.

•

•

Watch for oil leaking from the upper suction tube plug that was loosened previously and tighten this plug when oil leaks out. Continue pumping slowly and watch the oil sight gauge on the reservoir. Continue pumping slowly until the hydraulic tank is full.

Fill the saw pump by removing plug (on top of the pump) and carefully filling pump with oil.

Be sure to replace plug after filling.

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

4. Reconnect wires on injector pump solenoid.

Do not start engine.

5. Install a 0-1000 psi. gauge on drive pump to check charge pressure at ‘G’ (top TEE fitting).

Watch gauge closely during startup.

6. Start engine. If charge pressure does not rise within 20 to 30 seconds, TURN ENGINE OFF. If charge pressure is between 260 and 450 psi., run engine at IDLE for 20 minutes.

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

7. Install a 0 - 1000 psi. gauge on pilot manifold. ("P2" on right side, quick connect fitting) 8. Turn pilot pressure reducing valve (far left end, top of pilot manifold) all the way IN until it is lightly seated.

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

10. Using same gauge, reset pilot pressure reducing valve to 550 psi. and lock. Remove pressure gauge from the pilot manifold.

11. Install a 0-5000 psi. gauge on steer circuit main relief (iron block, quick connect fitting).

12. Set steer relief to 2000 psi. on gauge.

3.12

Tigercat 726B Feller Buncher

Lubrication and Maintenance

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

Remove gauge from steer relief valve.

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

14. 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.

15. To test the transmission lubrication pump, connect a 0 - 60 psi. pressure gauge to the quick connect fitting on the right side of the pump. Put transmission in NEUTRAL , set throttle to FULL, press FORWARD drive pedal and the pressure should reach 20 psi. or more in less than 10 seconds. Check this reading twice.

IMPORTANT Without a felling head attached, 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.

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

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

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

NOTE:If the machine was on wheels, the steer and drive functions were not 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 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.

CRANK,LINK AND BOOM ARMS

CRANK ARM LINK ARM

•

• • BOOM ARM

•• 192-21A

3.13

Tigercat 726B Feller Buncher

Lubrication and Maintenance

CHECKING THE AIR CONDITIONING SYSTEM Any service work must be performed by authorized A/C technicians. The system should be charged only with R134a refrigerant. Only PAG (polyalkylene glycol) oil should be present in the system and must be used on 'O' rings and fittings during assembly.

CAUTION If using compressed air for cleaning filters, use at 30 psi. or less. Always use personal protective equipment to guard against flying debris.

IMPORTANT

PAG OIL R134a REFRIGERANT (polyalkylene glycol) 2 lbs. 12 oz.

7 oz.

The A/C compressor is accessed from the left side engine compartment. The receiver dryer is accessed by removing the screened panel between the cab and the engine radiator assembly, on the right side of the machine. The evaporator core is accessed on the right hand side of the machine just inside the cab door.

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.

A/C CONDENSER CORE

a. Check and adjust compressor drive belt tension.

•

b. Check air intake filters and clean as required. Refer to Items (16) and (18). c. Check the condenser core for dirt and debris. Clean as required. 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.

230-23A

Check to see that compressor clutch will ngage.

3.14

CHECK A/C CONDENSER CORE

Tigercat 726B Feller Buncher

Lubrication and Maintenance

SHUT-OFF VALVE

ENGINE

••

•• HOSE TO A/C HEATER UNIT

••

•• 231-11

••

ENGINE

FRESH AIR FILTER

FILTER - CAB FRESH AIR

SHUT-OFF VALVE

• •

229-17

FILTER

HOT WATER SHUT OFF VALVE (CAT ENGINE)

209-11

When the air source control knob on the A/C heater control panel is in the FRESH AIR position (rotated to the right), outside air is drawn into the cab air conditioning unit through this filter and mixed with interior air from the cab. The filter is located in the rear of the cab roof and accessible from outside the cab.

HOSE TO A/C HEATER UNIT

HOT WATER SHUT OFF VALVE (CUMMINS ENGINE)

IMPORTANT

HOT WATER SHUT OFF VALVE (ENGINE)

These fresh air filters may require cleaning more frequently under extreme conditions.

During times when cab heating is not required the HOT WATER SHUT OFF VALVE, on the heater hose from the engine, should be closed to prevent hot water from seeping through the A/C unit, thereby reducing the cooling system effect. This valve must be open when cab heating is required.

This filter should be cleaned or replaced every 125 hours. This is done by removing six bolts and removing the air inlet cover. Remove the filter retainer (two bolts). Filter can now be removed for cleaning or replacing.

FILTER

•

•

HEAT CONTROL DIAL

208-19

RECIRCULATING AIR FILTER

FILTER, RECIRCULATING AIR - A/C UNIT

196-19A

When the air source control knob on the A/C heater control panel is in the RECIRCULATING position (rotated to the left), air in the cab is drawn into the A/C- HEATER unit via this filter and recirculated. This filter is located at the base of the A/C unit, below the right arm of the operator’s seat.

Filter should be cleaned or replaced every 125 hours. This is done by removing the two thumb screws in the filter box cover.

AIR CONDITIONER HEATER CONTROLS

HEAT CONTROL DIAL To maximize the efficiency of the air conditioning, the heat control dial must be rotated to the OFF position. Do not force dial past OFF position.

Ensure that HOT WATER SHUT OFF VALVE on engine is closed during summer months. If A/C blows warm air, the cable from this heat control dial to the heater/air conditioning unit may require some adjustment (at back of dial).

3.15

Tigercat 726B Feller Buncher

Lubrication and Maintenance

TORQUE CHART LOCATION

Cylinders Pin bolts Piston nut, steer cyl.

Piston nut, boom/tilt cyl.

Gland, steer cyl.

Keeper plate bolts

THREAD DIAMETER

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 620 389-427

Cab securing bolts

3/4" UNC

282-310

393-420

Center joint bearing Bearing retaining bolts Pin retaining bolts

1/2" UNC 3/4" UNC

80-88 282-310

109-119 393-420

Engine mounting Bolts Bolts, bracket to bell housing.

7/8" UNC M16

600 200

827 275

Pump drive gearbox Drive plate to flywheel Bell housing to CAT engine Bell housing to CUMMINS engine Engine mounting bracket

3/8" UNC 3/8" UNC 10 X 1.5 5/8" UNC

33-36 33-36 32 159-175

45-49 45-49 43 216-237

1 1/4" - 18 UNEF 5/8" UNC

475-525 80-88

645-715 109-119

3/8" UNF

37-41

50-55

3/8" UNF

37-41

50-55

7/8" UNC 3/4" UNC

455-501 282-310

617-679 393-420

7/8" UNF 3/4" UNC

500-550 282-310

679-745 679-745

Drive shafts Yoke retaining nut, front shaft Pillow block retaining bolts Rear drive shaft universal joint bolts Mid. and front drive shaft universal joint bolts Axle mounting bolts Front Rear Wheel bolts

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

3.16

Tigercat 726B Feller Buncher

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 5 BOLTS

GRADE 8 BOLTS COARSE THREADS 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 THREADS 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 LUBRICATED lbf-ft Nm lbf-ft Nm 11 - 12 15 - 16 8 - 10 11 - 13 20 - 28 27 - 38 26 - 30 35 - 40 44 -48 60 - 65 33 - 36 45 - 49 70 - 77 95 - 104 52 - 57 71 - 77 106 - 117 144 - 158 80 - 88 109 - 119 153 - 168 208 - 228 115 - 127 156 - 172 212 - 233 288 - 316 159 - 175 216 - 237 376 - 414 510 - 561 282 - 310 393 - 420 606 - 667 822 - 904 455 - 501 617 - 679 909 - 1000 1233 - 1355 682 - 750 925 - 1016 1288 - 1417 1746 - 1921 966 - 1062 1310 - 1441 1817 - 1999 2464 - 2710 1360 - 1496 1844 - 2027 DRY LUBRICATED lbf-ft Nm lbf-ft Nm 13 - 14 18 - 19 10 - 13 14 - 17 23 - 28 31 - 38 18 - 25 25 - 33 49 - 54 67 - 73 37 - 41 50 - 55 78 - 86 106 - 116 58 - 64 79 - 86 120 - 132 163 - 179 90 - 99 122 - 134 171 - 188 232 - 255 128 - 141 174 - 191 240 - 264 326 - 358 180 - 198 244 - 268 420 - 462 570 - 626 315 - 347 427 - 470 668 - 735 906 - 996 501 - 550 679 - 745 995 - 1096 1359 - 1486 746 - 821 1012 - 1113 1445 - 1590 1960 - 2155 1083 - 1191 1469 - 1613 2012 - 2213 2728 - 2997 1509 - 1660 2046 - 2250

COARSE DRY THREADS lbf-ft Nm 1/4" - 20 7- 8 10 - 11 5/16" - 18 14 - 18 19 - 24 3/8" - 16 31 - 34 42 - 46 7/16" - 14 49 - 54 66 - 73 1/2" - 13 75 - 83 102 - 112 9/16" - 12 109 - 120 148 - 162 5/8" - 11 150 - 165 204 - 223 3/4" - 10 266 - 293 360 - 397 7/8" - 9 394 - 433 535 - 586 1" - 8 591 - 649 802 - 879 1 1/8" - 7 794 - 873 1077 - 1183 1 1/4" - 7 1120 - 1232 1519 - 1670 FINE DRY THREADS lbf-ft Nm 1/4" - 28 9 - 10 12 - 13 5/16" - 24 17 - 22 23 - 29 3/8" - 24 35 - 39 48 - 53 7/16" - 20 55 - 61 75 - 83 1/2" - 20 85 - 94 116 - 127 9/16" - 18 121 - 133 164 - 180 5/8" - 18 170 - 187 231 - 253 3/4" - 16 297 - 327 403 - 443 7/8" - 14 434 - 477 589 - 646 1" - 12 646 - 711 876 - 965 1 1/8" - 12 891 - 980 1208 - 1328 1 1/4" - 12 1240 - 1364 1682 - 1849

LUBRICATED lbf-ft Nm 8 - 10 11 - 13 10 - 15 13 - 20 23 - 25 31 - 34 37 - 41 50 - 55 57 - 63 77 - 85 82 - 90 111 - 122 113 - 124 152 - 168 200 - 220 271 - 298 296 - 326 402 - 441 443 - 489 601 - 663 596 - 656 808 - 889 840 - 924 1139 - 1252 LUBRICATED lbf-ft Nm 9 - 10 12 - 13 16 - 20 21 - 27 26 - 29 35 - 39 41 - 45 56 - 61 64 - 70 87 - 95 91 - 100 124 - 135 128 - 141 174 - 191 223 - 245 303 - 332 326 - 359 442 - 486 484 - 534 657 - 724 668 - 735 906 - 996 931 - 1024 1262 - 1387

METRIC

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

M6 M8 M10

4.8 12 23

3.5 8.5 17

6 15 29

4.5 11 21

9 22 43

6.5 16 32

11 28 55

8.5 20 40

13 32 63

9.5 24 47

17 40 80

12 30 60

15 37 75

11.5 28 55

19 47 95

14.5 35 70

M12 M14 M16

40 63 100

29 47 73

50 80 125

37 60 92

75 120 190

55 88 140

95 150 240

70 110 175

110 175 275

80 130 200

140 225 350

105 165 225

130 205 320

95 150 240

165 260 400

120 190 300

M18 M20 M22

135 190 260

100 140 190

175 240 330

125 180 250

260 375 510

195 275 375

330 475 650

250 350 475

375 530 725

275 400 540

475 675 925

350 500 675

440 625 850

325 460 625

560 800 1075

410 580 800

M24 M27 M30

330 490 675

250 360 490

425 625 850

310 450 625

650 950 1300

475 700 950

825 1200 1650

600 875 1200

925 1350 1850

675 100 1350

1150 1700 2300

850 1250 1700

1075 1600 2150

800 1150 1600

1350 2000 2700

1000 1500 2000

M33 M36

900 1150

675 850

1150 1450

850 1075

1750 2250

1300 1650

2200 2850

1650 2100

2500 3200

1850 2350

3150 4050

2350 3000

2900 3750

2150 2750

3700 4750

2750 3500

3.17

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

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

Tigercat 726B Feller Buncher

Lubrication and Maintenance

PRESSURE SETTINGS (WITH Tigercat 18" and 20" BUNCHING SHEAR)

Engine RPM ...................................................... 2200 RPM MAX 1000 RPM IDLE Hydrostatics: Charge Pressure Rexroth Pump ....................................................450 PSI @ 2200 RPM Rexroth Motor ....................................................NON - ADJUSTABLE

Pump Main Reliefs P.O.R. Forward ................................................ 4800 PSI P.O.R. Reverse ................................................ 4800 PSI High Pressure Relief Forward @ 1/3 Pedal ....... 5400 PSI High Pressure Relief Reverse @ 1/3 Pedal ........ 5400 PSI

@2200 RPM @2200 RPM @1000 RPM @1000 RPM

Drive Motor P.O.R. (Begin of Stroke)................. **3700 PSI (PUMP) @ 1000 RPM **NOTE: Gauge reading at 'M1' port on motor should "spike" over 3000 psi when 'Ma' on pump is @ 3700 psi.

See procedure in SECTION 8 of the SERVICE MANUAL.

Steer Main Relief................................................ 2500 PSI @ 2200 RPM Steer Port Relief Left .......................................... 3200 PSI @ 1000 RP Steer Port Relief Right ....................................... 3200 PSI @ 1000 RPM Attachment Pump Shear Pump P.O.R. ............................................ 3500 PSI @ 1000 RPM Shear Pump Low Pressure Control .................... Turned in Fully Boom Valve Shear/Clamp Close Port Relief (End Inlet) .........

Clamp Open Port Relief ......................................

Mid Inlet Main Relief ...........................................

Tilt Back Port Relief.............................................

Tilt Forward Port Relief .......................................

Accumulator Close Port Relief ............................

Accumulator Open Port Relief ............................

Shear Open Port Relief .......................................

Lift Up Port Relief ................................................

Lift Down Port Relief ...........................................

3700 3700 2600 2900 2900 3200 3200 3200 2900 2200

Pilot Pressure Reducing Valve............................ 550 Pilot Pressure Relief Valve .................................. 675

PSI PSI PSI PSI PSI PSI PSI PSI PSI PSI

@ @ @ @ @ @ @ @ @ @

1000 1000 2200 1000 1000 1000 1000 1000 1000 1000

RPM RPM RPM RPM RPM RPM RPM RPM RPM RPM

PSI @ 1000 RPM PSI @ 1000 RPM

Brake Maximum Pressure ................................... 1000 PSI @ 1000 RPM

ISSUE 1 2/99

3.18

Tigercat 726B Feller Buncher

Lubrication and Maintenance

PRESSURE SETTINGS (WITH Tigercat DW5000 (19") BUNCHING SAW)

Engine RPM ...................................................... 2200 RPM MAX 1000 RPM IDLE Hydrostatics: Charge Pressure Rexroth Pump .................................................... 450 PSI @ 2200 RPM Rexroth Motor .................................................... NON - ADJUSTABLE

Pump Main Reliefs P.O.R. Forward ................................................ 4800 PSI P.O.R. Reverse ................................................ 4800 PSI High Pressure Relief Forward @ 1/3 Pedal ....... 5400 PSI High Pressure Relief Reverse @ 1/3 Pedal ........ 5400 PSI

@2200 RPM @2200 RPM @1000 RPM @1000 RPM

Drive Motor P.O.R. (Begin of Stroke)................. **3700 PSI (PUMP) @ 1000 RPM **NOTE: Gauge reading at 'M1' port on motor should "spike" over 3000 psi when 'Ma' on pump is @ 3700 psi.

See procedure in SECTION 8 of the SERVICE MANUAL.

Steer Main Relief................................................ 2500 PSI @ 2200 RPM Steer Port Relief Left .......................................... 3200 PSI @ 1000 RPM Steer Port Relief Right ....................................... 3200 PSI @ 1000 RPM Attachment Pump Saw Pump P.O.R. .............................................. 3600 PSI @ 1000 RPM Saw Pump Low Pressure Control ...................... Turned in Fully Saw Blade Speed ............................................... 1275 ± 25 RPM Saw Motor Begin of Regulation ......................... 3100 PSI @ 2200 RPM Boom Valve Saw Main Relief ................................................. 3900 Mid Inlet Main Relief .......................................... 2600 Tilt Back Port Relief............................................ 2900 Tilt Forward Port Relief ...................................... 2900 Accumulator Close Port Relief ........................... 3200 Accumulator Open Port Relief ........................... 3200 Clamp Open Port Relief ..................................... 1100 Clamp Close Port Relief ..................................... 3200 Lift Up Port Relief ............................................... 2900 Lift Down Port Relief .......................................... 2200

PSI PSI PSI PSI PSI PSI PSI PSI PSI PSI

Pilot Pressure Reducing Valve........................... 550 Pilot Pressure Relief Valve ................................. 675

PSI @ 1000 RPM PSI @ 1000 RPM

@ @ @ @ @ @ @ @ @ @

1000 2200 1000 1000 1000 1000 1000 1000 1000 1000

RPM RPM RPM RPM RPM RPM RPM RPM RPM RPM

Brake Maximum Pressure .................................. 1000 PSI @ 1000 RPM

ISSUE 1 2/99

3.19

Tigercat 726B Feller Buncher

Lubrication and Maintenance

PRESSURE SETTINGS (WITH Tigercat DW5600 (22") BUNCHING SAW)

Engine RPM ......................................................2200 RPM MAX 1000 RPM IDLE Hydrostatics: Charge Pressure Rexroth Pump ....................................................450 PSI @ 2200 RPM Rexroth Motor ....................................................NON - ADJUSTABLE

Pump Main Reliefs P.O.R. Forward ................................................ 4800 PSI P.O.R. Reverse ................................................ 4800 PSI High Pressure Relief Forward @ 1/3 Pedal ....... 5400 PSI High Pressure Relief Reverse @ 1/3 Pedal ........ 5400 PSI

@2200 RPM @2200 RPM @1000 RPM @1000 RPM

Drive Motor P.O.R. (Begin of Stroke)................. **3700 PSI (PUMP) @ 1000 RPM **NOTE: Gauge reading at 'M1' port on motor should "spike" over 3000 psi when 'Ma' on pump is @ 3700 psi.

See procedure in SECTION 8 of the SERVICE MANUAL.

Steer Main Relief................................................2500 PSI @ 2200 RPM Steer Port Relief Left ..........................................3200 PSI @ 1000 RP Steer Port Relief Right .......................................3200 PSI @ 1000 RPM Attachment Pump Saw Pump P.O.R. ..............................................3600 PSI @ 1000 RPM Saw Pump Low Pressure Control ...................... Turned in Fully Saw Blade Speed ............................................... 1150 ± 25 RPM Saw Motor Begin of Regulation ......................... 3100 PSI @ 2200 RPM Boom Valve Saw Main Relief .................................................3900 Mid Inlet Main Relief ..........................................2600 Tilt Back Port Relief............................................2900 Tilt Forward Port Relief ......................................2900 Accumulator Close Port Relief ...........................3200 Accumulator Open Port Relief ...........................3200 Clamp Open Port Relief .....................................1100 Clamp Close Port Relief .....................................3200 Lift Up Port Relief ...............................................2900 Lift Down Port Relief ..........................................2200

PSI PSI PSI PSI PSI PSI PSI PSI PSI PSI

Pilot Pressure Reducing Valve...........................550 Pilot Pressure Relief Valve.................................675

PSI @ 1000 RPM PSI @ 1000 RPM

@ @ @ @ @ @ @ @ @ @

1000 2200 1000 1000 1000 1000 1000 1000 1000 1000

RPM RPM RPM RPM RPM RPM RPM RPM RPM RPM

Brake Maximum Pressure ..................................1000 PSI @ 1000 RPM

ISSUE 1 2/99

3.20

Tigercat 726B Feller Buncher

Lubrication and Maintenance

PRESSURE SETTINGS (WITH KOEHRING WATEROUS 18" DISC SAW FELLING HEAD)

Engine RPM ...................................................... 2200 RPM MAX 1000 RPM IDLE Hydrostatics: Charge Pressure Rexroth Pump .................................................... 450 PSI @ 2200 RPM Rexroth Motor .................................................... NON - ADJUSTABLE

Pump Main Reliefs P.O.R. Forward ................................................ 4800 PSI P.O.R. Reverse ................................................ 4800 PSI High Pressure Relief Forward @ 1/3 Pedal ....... 5400 PSI High Pressure Relief Reverse @ 1/3 Pedal ........ 5400 PSI

@2200 RPM @2200 RPM @1000 RPM @1000 RPM

Drive Motor P.O.R. (Begin of Stroke)................. **3700 PSI (PUMP) @ 1000 RPM **NOTE: Gauge reading at 'M1' port on motor should "spike" over 3000 psi when 'Ma' on pump is @ 3700 psi.

See procedure in SECTION 8 of the SERVICE MANUAL.

Steer Main Relief................................................ 2500 PSI @ 2200 RPM Steer Port Relief Left .......................................... 3200 PSI @ 1000 RPM Steer Port Relief Right ....................................... 3200 PSI @ 1000 RPM Attachment Pump Saw Pump P.O.R. .............................................. 3600 PSI @ 1000 RPM Saw Pump Low Pressure Control ...................... Turned in Fully Saw Blade Speed ............................................... 1300 ± 25 RPM Saw Motor Begin of Regulation ......................... 3100 PSI @ 2200 RPM Boom Valve Saw Main Relief ................................................. 3900 Mid Inlet Main Relief .......................................... 2600 Tilt Back Port Relief ............................................ 2900 Tilt Forward Port Relief ...................................... 2900 Accumulator Close Port Relief ........................... 3200 Accumulator Open Port Relief ........................... 3200 Clamp Open Port Relief ..................................... 1100 Clamp Close Port Relief ..................................... 3200 Lift Up Port Relief ............................................... 2900 Lift Down Port Relief .......................................... 2200

PSI PSI PSI PSI PSI PSI PSI PSI PSI PSI

Pilot Pressure Reducing Valve ........................... 550 Pilot Pressure Relief Valve ................................. 675

PSI @ 1000 RPM PSI @ 1000 RPM

@ @ @ @ @ @ @ @ @ @

1000 2200 1000 1000 1000 1000 1000 1000 1000 1000

RPM RPM RPM RPM RPM RPM RPM RPM RPM RPM

Brake Maximum Pressure .................................. 1000 PSI @ 1000 RPM

ISSUE 2 11/ 99

3.21

Tigercat 726B Feller Buncher

Lubrication and Maintenance

PRESSURE SETTINGS (WITH KOEHRING WATEROUS 20" DISC SAW FELLING HEAD)

Engine RPM ......................................................2200 RPM MAX 1000 RPM IDLE Hydrostatics: Charge Pressure Rexroth Pump ....................................................450 PSI @ 2200 RPM Rexroth Motor ....................................................NON - ADJUSTABLE

Pump Main Reliefs P.O.R. Forward ................................................ 4800 PSI P.O.R. Reverse ................................................ 4800 PSI High Pressure Relief Forward @ 1/3 Pedal ....... 5400 PSI High Pressure Relief Reverse @ 1/3 Pedal ........ 5400 PSI

@2200 RPM @2200 RPM @1000 RPM @1000 RPM

Drive Motor P.O.R. (Begin of Stroke)................. **3700

PSI (PUMP) @1000 RPM

**NOTE: Gauge reading at 'M1' port on motor should "spike" over 3000 psi when 'Ma' on pump is @ 3700 psi.

See proce dure in SECTION 8 of the SERVICE MANUAL.

Steer Main Relief................................................2500 PSI @ 2200 RPM Steer Port Relief Left ..........................................3200 PSI @ 1000 RP Steer Port Relief Right .......................................3200 PSI @ 1000 RPM Attachment Pump Saw Pump P.O.R. ..............................................3600 PSI @ 1000 RPM Saw Pump Low Pressure Control ...................... Turned in Fully Saw Blade Speed ............................................... 1175 ± 25 RPM Saw Motor Begin of Regulation ......................... 3100 PSI @ 2200 RPM Boom Valve Saw Main Relief .................................................3900 Mid Inlet Main Relief ..........................................2600 Tilt Back Port Relief............................................2900 Tilt Forward Port Relief ......................................2900 Accumulator Close Port Relief ...........................3200 Accumulator Open Port Relief ...........................3200 Clamp Open Port Relief .....................................1100 Clamp Close Port Relief .....................................3200 Lift Up Port Relief ...............................................2900 Lift Down Port Relief ..........................................2200

PSI PSI PSI PSI PSI PSI PSI PSI PSI PSI

Pilot Pressure Reducing Valve...........................550 Pilot Pressure Relief Valve.................................675

PSI @ 1000 RPM PSI @ 1000 RPM

@ @ @ @ @ @ @ @ @ @

1000 2200 1000 1000 1000 1000 1000 1000 1000 1000

RPM RPM RPM RPM RPM RPM RPM RPM RPM RPM

Brake Maximum Pressure ..................................1000 PSI @ 1000 RPM

ISSUE 1 2/99

3.22

Tigercat 726B Feller Buncher

SECTION 5 - PILOT SYSTEM MAR 99

CONTENTS - SECTION 5 ACCUMULATOR CHARGE VALVE ...................................................................... 2 EXPLODED VIEW ............................................................................................ 4 OPERATING DESCRIPTION ............................................................................ 3 REPLACE FILTER ............................................................................................ 4 SCHEMATIC ..................................................................................................... 3 ACCUMULATORS ................................................................................................ 4 BRAKE ACCUMULATOR .................................................................................. 5 CHARGING ...................................................................................................... 5 CHECK PRE-CHARGE PRESSURE ................................................................ 5 PILOT ACCUMULATOR .................................................................................... 5 RELEASING PRESSURE ................................................................................. 2 TESTING DEVICE ............................................................................................ 5 COMPONENTS ................................................................................................... 2 PILOT CIRCUIT DESCRIPTION .......................................................................... 9 PILOT CIRCUIT DIAGRAM .................................................................................. 8 PILOT MANIFOLD ............................................................................................... 7 ASSEMBLY DIAGRAM ...................................................................................... 6 OPERATING DESCRIPTION ............................................................................ 7 PILOT SHUT OFF ............................................................................................. 7 PILOT PRESSURE SETTINGS ........................................................................... 9 RELEASE PILOT SYSTEM PRESSURE ............................................................. 2

Tigercat 726B Feller Buncher

Pilot System PILOT SYSTEM COMPONENTS

RELEASE PILOT SYSTEM PRESSURE

Oil flow for the pilot system is supplied by the fixed displacement boom/steer pump. The accumulator charge valve diverts some of this oil to the accumulators and the 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). Another solenoid valve is used as the pilot shut off to stop the flow of pilot oil to all pilot actuated functions.

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

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.

For information on the boom/steer pump and joystick control valves, refer to SECTION 11 in THIS MANUAL.

The following steps must be followed to release pressure:

For a detailed description of foot operated control valves, refer to SECTION 8 in THIS MANUAL.

a) close both doors, turn ignition switch to ON position, do not start the engine, press pilot reset switch .

THIS SECTION details the location, and operation of the accumulator charge valve, accumulators and the pilot manifold (including solenoid valves).

b) activate all controls (switches, joysticks, left foot pedal etc.) and pump brake foot pedal at least 50 times or more. c) pressure may remain in the system after these numerous applications, use caution when loosening hydraulic connections.

ACCUMULATOR CHARGE VALVE The accumulator charge valve controls the flow of oil to the pilot manifold, the steer valve, and to both accumulators. The two accumulators are in series for charging.

A check valve, situated between the two accumulators, prevents the pilot system from using pressure stored in the brake accumulator, but allows the brake system to use pilot accumulator pressure. This check valve also prevents the loss of hydraulic oil from the brake accumulator should the pilot system fail (leaving brake accumulator pressure for braking).

PRESSURE PORT

STEERING PORT

DRAIN PORT

FILTER LOCATION

ACCUM. PORT MO-03

5.2

ACCUMULATOR CHARGE VALVE

Tigercat 726B Feller Buncher

Pilot System

An internal sintered bronze filter is incorporated in the charge valve, through which all oil going to the pilot manifold and accumulators must flow. This filter should be replaced every 2000 hours. For replacement procedures for this filter, refer to REPLACE CHARGE VALVE FILTER in THIS SECTION. Except for replacement of this filter, no adjustments or pressure settings are required.

spring and the accumulator hydraulic force to balance the hydraulic force due to the pump pressure acting on the opposite end of the charging valve spool.

CHARGE VALVE OPERATING DESCRIPTION

The rate at which the accumulator is charged depends on the orifice in the check valve seat.

When the accumulator is charged to its high limit (1800 psi.), this pressure will unseat the upper limit check ball, and seat the lower limit check ball.

When the upper limit check ball is unseated, the pressure in the chamber back of the charging valve spool is allowed to flow to return; thus permitting the charging valve spool to unload the pump.

This means that the pump pressure is always higher (by spring pressure) than the accumulator pressure which causes the accumulator to charge.

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

When the pressure in the accumulator drops to its lower limit (1200 psi.), the pilot valve spring will unseat the lower limit check ball, and at the same time, seat the upper limit check ball. The pilot valve spool permits only one of these balls to be seated at any time.

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.

When the lower limit check ball is unseated, pressure from the accumulator enters the chamber in back of the charging valve spool. This allows the combination of the charging valve

SYSTEM PRESSURE

ACCUMULATOR PRESSURE

RETURN LINE PRESSURE

UPPER LIMIT CHECK BALL

UPPER LIMIT CHECK BALL

PILOT VALVE SPOOL TO ACCUMULATOR

PILOT VALVE SPOOL RETURN

TO ACCUMULATOR

LOWER LIMIT CHECK BALL PILOT VALVE SPRING

CHECK VALVE

RETURN

LOWER LIMIT CHECK BALL 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

ACCUMULATOR CHARGED

ACCUCHG

TO STEER VALVE

PRESS. PORT

CHARGING VALVE SPOOL

ACCUMULATOR BEING CHARGED

TYPICAL CHARGING VALVE SCHEMATICS

5.3

Tigercat 726B Feller Buncher

Pilot System

REPLACE CHARGE VALVE FILTER

Remove carefully as parts may fall out.

NOTE: This sintered bronze filter should be replaced every 2000 hours. The filter is included in kit number 90045. Do not clean and reinstall an old filter.

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.

The accumulator charge valve is accessed from the left side engine door.

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.

1. Machine to be parked on level ground with felling head lowered and oil cool. Apply parking brake and shut off engine.

2. Release hydraulic oil pressures;

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

• turn ignition switch to the ON position, do not start the engine, press the pilot reset switch

ACCUMULATORS

• activate all controls (switches, joysticks, foot pedals, triggers etc.) and pump brake foot pedal at least 50 times or more until pressure is no longer present at the pedal

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. 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 REPLACE CHARGE VALVE

• pressure may remain in the system after numerous applications of the brake pedal, use caution when loosening hydraulic connections.

3. The charge valve is between the frame and the engine. Clean all debris from this area.

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

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

PRESSURE PORT STEERING PORT

DRAIN PORT ACCUMULATOR PORT WASHER FILTER WASHER "O" RING SEAT POPPET SPRING "O" RING

AU001-3

ACCUMULATOR CHARGE VALVE (EXPLODED VIEW) 5.4

PLUG LOCKNUT

Tigercat 726B Feller Buncher

Pilot System check valve is sent to the brake pilot valve and then to the rear axle brakes.

VALVE GUARD VALVE CAP

CHARGING THE ACCUMULATORS NOTE: A detailed instruction sheet is provided with the charging and testing device.

GAS VALVE

BODY

•

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 on to the gas valve.

•

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 observe the gauge.

•

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

BLADDER

POPPET (Seats against oil port after oil evacuation)

HYDRAULIC CONNECTION

ACCU-1

ACCUMULATOR (BLADDER TYPE)

WARNING • The accumulator must not be altered in any way. Do not weld or machine the pressure vessel.

• Only use NITROGEN to charge the accumulators, never use oxygen or air due to the risk of explosion.

Pilot Accumulator pre-charge - 750 psi.

FILTER in THIS SECTION for this procedure.

Brake Accumulator pre-charge - 700 psi.

PILOT ACCUMULATOR

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 the precharge and adjust if necessary.

The pilot manifold accumulator receives pressure from the accumulator charge valve. This accumulator will dampen system pressure fluctuations and with a stored pressure of 1800 psi. is used as an emergency reserve for the functions that are controlled through the pilot manifold. Minimal movement of these functions is available after the engine stalls or is shut down.

•

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 gas valve is leaking, it should be replaced. Use only valves approved for accumulator service.

NEVER USE AN AUTOMOTIVE TYPE VALVE.

BRAKE ACCUMULATOR The brake accumulator receives pressure from the accumulator charge valve. The accumulator ensures that the brake control remains responsive at all times by maintaining an optimum pilot pressure of 1800 psi. to the brake pilot valve (foot pedal). The oil from the accumulator side of the

CHECKING THE PRE-CHARGE PRESSURE Bleed off the system pressure as stated earlier.

After the accumulator has been put in service, the pre-charge pressure should be checked with an accumulator charging and testing device.

ASSEMBLY PART NO. 90254 INCLUDES PARTS SHOWN *

HOSE*

PRESSURE GAUGE*

Install the charging and testing device on to the gas valve. While depressing the button on the charging device, observe gas pressure reading on gauge.

ADAPTER* ADAPTER* NITROGEN BOTTLE ACCU-2

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

ACCUMULATOR

CHARGING AND TESTING DEVICE 5.5

Tigercat 726B Feller Buncher

Pilot System

PILOT MANIFOLD WITH ELECTRICALLY OPERATED CLAMPS 15

•

•

SOLENOID OPERATED CONTROL VALVE(S)

TWO ADDITIONAL SOLENOID VALVES (ITEM 15) IN C6 AND C7 PORTS ARE REQUIRED WITH ELECTRICALLY OPERATED CLAMPS

PRESSURE REDUCING VALVE RELIEF VALVE

PILOT OIL TO BOOM JOYSTICK (END OF BLOCK)

PLUGGED PORTS

PILOT SHUT OFF VALVE

GAUGE TEST PORT

ACCUMULATOR OPEN

ORIFICE ACCUMULATOR CLOSE

CREEP REAR DIFFERENTIAL LOCK

IN FROM ACCUM. CHARGE VALVE

AW119

SAW DRIVE FRONT DIFFERENTIAL LOCK ORIFICE

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

PILOT MANIFOLD ASSEMBLY 5.6

Tigercat 726B Feller Buncher PILOT MANIFOLD

Pilot System The pilot shut off solenoid operated 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 solenoid valves (C1 - C8) and their functions will repond to the operator’s movement. Refer to PILOT SYSTEM SHUT OFF in SECTION 2 of the OPERATOR’S MANUAL.

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: • • • • • • • • •

} (P2) Front port

Steer joystick Clamp(s) foot pedal Boom joystick Rear Axle diff. lock Creep Accum. arm(s) close Accum. arm(s) open Front Axle diff. lock Saw Drive

(P2) End port (C1) Sol. valve (C2) Sol. valve (C3) Sol. valve (C4) Sol. valve (C5) Sol. valve (C8) Sol. valve

To adjust the pressure reducing valve and the relief valve loosen the jamnut and screw out (counter-clockwise) the adjusting screw to lower the pressure value or screw in the adjusting screw (clockwise) to raise the pressure value.

Tighten jamnut to lock this setting. For complete pressure setting instructions, refer to PILOT PRESSURE SETTINGS in THIS SECTION.

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. Six solenoid operated control valves are installed at outlet ports C1, C2, C3, C4, C5, and C8. Plugs are installed in ports C6 and C7. A “quick connect” fitting is installed in one of the P2 ports to attach a pressure gauge during set-up procedures.

The solenoid valves control the position of the spool valves or pistons to which they are hydraulically connected. When a solenoid valve is energized, usually by a switch in the cab, its spool is shifted and pilot oil is directed to one end of a spool valve or piston.

Oil is supplied to the pilot manifold (port P1) from the steer pump via the accumulator charge valve and the accumulator. The 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.

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 oil, to six solenoid pilot valves, the steer joystick and the boom joystick, first passes through the pressure reducing valve.

The pressure reducing valve reduces and maintains the pilot pressure on the outlet side of the pilot manifold to a pre-set value. The relief valve, located down stream from, and set higher than the pressure reducing valve, diverts pilot oil back to tank in the event that the reducing valve fails to limit the down stream pressure.

5.7

Tigercat 726B Feller Buncher

726B01

Pilot System

PILOT CIRCUIT (WITH SAW) 5.8

Tigercat 726B Feller Buncher

Pilot System

PILOT CIRCUIT DESCRIPTION Oil is supplied to the pilot manifold (port P1) from the boom/steer pump via the accumulator charge valve. The accumulator charge valve controls the flow of oil to the pilot manifold, the steer valve, and to both accumulators. The pilot accumulator provides a constant pressure source for the pilot controls. The two accumulators are in series for charging. A check valve, situated between the two accumulators, stops the pilot system from using brake accumulator pressure but allows the brake system to use pilot accumulator pressure.

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

2. Release hydraulic oil pressures;

When the cab doors have been closed, and the pilot reset switch has been turned on, the pilot shut off solenoid valve in the pilot manifold is energized and pilot oil is allowed to flow to the outlet ports (P2) and the solenoid operated pilot valves (C1 - C8) in the pilot manifold. When these pilot valves are energized, by switches in the cab, pilot oil is then allowed to flow to shift the spools in the corresponding control valves to operate the various functions. In the case of the front and rear differential locks, the pilot oil leaving the pilot manifold operates clutch packs in the axles to lock the differentials.

•

turn ignition switch to ON position, do not start the engine, press pilot reset switch .

•

activate all controls (switches, joysticks, foot pedals, triggers etc.) and pump brake foot pedal at least 50 times or more until pressure is no longer present at the pedal.

•

pressure may remain in the system after numerous applications of the brake pedal, use caution when loosening hydraulic connections.

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.

PILOT PRESSURE SETTINGS

4. Ensure that the hydraulic oil temperature is between 120°F and 140°F.

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

5. Turn the pressure reducing valve adjusting screw (far left, top of manifold) all the way in .

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 .

WARNING

7. Start the engine and put the throttle control to the IDLE position.

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

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.

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

5.9

Tigercat 726B Feller Buncher

Pilot System

5.10

Tigercat 726B Feller Buncher

SECTION 6 ELECTRICAL, GAUGES AND ALARMS NOVEMBER 2000

CONTENTS - SECTION 6 ELECTRICAL SCHEMATIC EARLIER MACHINES ......................................................................................... 6.2, 6.3 LATER MACHINES ............................................................................................. 6.4, 6.5 GAUGES AND ALARMS ................................................................................................ 6.8 INSTRUMENT PANEL WIRING DIAGRAM .................................................................... 6.7 RELAYS AND FUSES .................................................................................................... 6.6 SENSOR DETAILS ......................................................................................................... 6.8 SENSOR LOCATIONS ................................................................................................... 6.9 TROUBLESHOOTING AND TESTING .......................................................................... 6.8 WIRE COLOUR CODE CHART ..................................................................................... 6.6

Tigercat 726B Feller Buncher

Electrical, Gauges and Alarms

REFER TO COLOUR CODE CHART IN THIS SECTION

720B09

MACHINE SCHEMATIC DIAGRAM 3873B (REV 4, SHEET 1) (SERIAL NUMBERS 7261001 TO 7261106, 7261108 TO 7261110, 7261201, 7261203) 6.2

Tigercat 726B Feller Buncher

Electrical, Gauges and Alarms

REFER TO COLOUR CODE CHART IN THIS SECTION

720B10

MACHINE SCHEMATIC DIAGRAM 3873B (REV 4, SHEET 2) (SERIAL NUMBERS 7261001 TO 7261106, 7261108 TO 7261110, 7261201, 7261203) 6.3

Tigercat 726B Feller Buncher

Electrical, Gauges and Alarms

REFER TO COLOUR CODE CHART IN THIS SECTION

726B10

MACHINE SCHEMATIC DIAGRAM 3873B (REV 8, SHEET 1) (SERIAL NUMBERS 7261107, 7261202, 7261204 AND UP) 6.4

Tigercat 726B Feller Buncher

Electrical, Gauges and Alarms

REFER TO COLOUR CODE CHART IN THIS SECTION

726B11

MACHINE SCHEMATIC DIAGRAM 3873B (REV 8, SHEET 2) (SERIAL NUMBERS 7261107, 7261202, 7261204 AND UP) 6.5

Tigercat 726B Feller Buncher

Electrical, Gauges and Alarms

Tigercat wire colour code chart applicable to all products manufactured by Tigercat Industries Inc. COLOUR Red Black White Blue Purple Tan Yellow Grey Brown Green Orange

FUNCTION EXAMPLE Power ........................................ (fused and unfused) Ground Engine control ........................... (fuel shut-off, start aid) Propulsion Control .................... (transmission/reverser solenoids) Monitor, electrical and mechanical systems.................. (air cleaner, alternator, wheel speed, engine speed) Electrical and electromechanical control ......... (park brake, alternator excitation) (power door motor, backup alarm) Monitors .................................... (flow, pressure, temperature, level) Standard monitor system .......... (logic module to monitor) Lights Electro-hydraulic control ........... (pilot solenoids) Accessories .............................. (horn, A/C, heater)

START

DRIVE ENABLE

SAW

RELAY 3

RELAY 4

RELAY 5

DRIVE LOCK

5A 1 GAUGES 15A 2 SAFETY 10A 3 CONTROLS

30A 10 AC / HEATER

10A 4 FUEL 10A 5 RADIO / DOME

20A 11 LIGHTER 25A 12 F. LIGHTS

15A 6 BACK HORN 15A 7 ETHER

25A 13 R. LIGHTS 15A 14 HORN

RELAY 2

PILOT LOCK RELAY 1

8 AUX. 10A 9 AUX FAN

7834A

FUSE AND RELAY PANEL

6.6

Tigercat 726B Feller Buncher

720C-17

Electrical, Gauges and Alarms

INSTRUMENT PANEL WIRING DIAGRAM 1737D (REV 20) 6.7

Tigercat 726B Feller Buncher GAUGES AND ALARMS

Electrical, Gauges and Alarms

The 726B is monitored for proper operation by sensors located in the hydraulic system and on the engine. These sensors are connected to either gauges or warning lights.

To troubleshoot temperature and pressure type gauges, use an ohmeter to test between the terminals at the back of the gauge. Refer to illustration for reading values. If the resistance readings taken with the ohmeter are within the range shown, the gauge is functioning properly.

Faulty readings will therefore be the result of a poor sending unit.

For operation of the gauges and warning lights listed in the sensor chart below, refer to SECTION 2 of the OPERATOR'S MANUAL. The operator may sound the warning horn at any time. A back-up alarm will also sound when the machine is travelling in reverse.

726B07

SENSOR FUNCTION Engine oil pressure Engine hours Saw Circuit Pressure Volts Hydraulic oil temp.

Engine coolant temp.

Engine coolant temp.

Hydraulic oil low Back-up alarm Warning Horn

•

Engine Oil Pressure

•

Hydraulic Oil Temperature

•

Engine Coolant Temperature OHMETER TEST READINGS

GAUGE RANGE

LIGHT

HORN

0 - 100 psi 0 - 9999.9 0 - 5000 psi 8v - 18v 100°F - 240°F 100°F - 280°F 125°F - 240°F

-

-

On - Off

ON

-

Red light indicates 10 gallons below FULL

-

-

ON ON

Reverse drive pedal Switch on instrument panel

6.8

INFORMATION

Stop engine below 15 psi Total running hours Refer to SECTION 17 - SAW DRIVE Normal operating range 12 - 13.5 volts Stop machine above 185°F 190°F-210°F OP. RANGE(CUMMINS) 160°F-205°F OP. RANGE(CATERPILLAR)

Tigercat 726B Feller Buncher

Electrical, Gauges and Alarms

SENDER - COOLANT TEMPERATURE * LOCATION MAY VARY

BATTERY DISCONNECT SWITCH

START SOLENOID RELAY

SENDER ENGINE OIL PRESSURE

SENDER ENGINE HOURS

BATTERIES

SENDER - HYDRAULIC OIL TEMPERATURE

SENDER - HYDRAULIC OIL LEVEL

720B13

BACK UP ALARM

SENSOR LOCATIONS 6.9

Tigercat 726B Feller Buncher

Electrical, Gauges and Alarms

6.10

Tigercat 726B Feller Buncher

SECTION 7 - ENGINE NOVEMBER 2000

CONTENTS - SECTION 7 CIRCUIT DESCRIPTION EARLIER MACHINES .................................................. 7.2 LATER MACHINES ...................................................... 7.3 COOLING SYSTEM COOLANT FLOW DIAGRAM ....................................... 7.8 COOLANT FLOW DURING OPERATION .................... 7.8 FILLING THE SYSTEM WITH COOLANT .................... 7.8 FUEL CONTROL VALVE ................................................. 7.3 FUSES ............................................................................ 7.3 PARKING BRAKE ........................................................... 7.2 PRECLEANER OPERATION ................................................................ 7.9 SERVICE ..................................................................... 7.9 RELAYS AND FUSES ..................................................... 7.3 START CIRCUIT DIAGRAM (EARLIER MACHINES) AT REST ...................................................................... 7.4 RUN AND DRIVE ......................................................... 7.5 RUN, NO DRIVE .......................................................... 7.5 START ......................................................................... 7.4 START CIRCUIT DIAGRAMS (LATER MACHINES) AT REST ...................................................................... 7.6 RUN AND DRIVE ......................................................... 7.7 RUN, NO DRIVE .......................................................... 7.7 START ......................................................................... 7.6 STARTING SYSTEM DESCRIPTION ............................. 7.2 TACHOMETER SET-UP .................................................. 7.8

Tigercat 726B Feller Buncher STARTING CIRCUIT

Engine CIRCUIT DESCRIPTION (SERIAL NUMBERS 7261001 TO 7261106, 7261108 TO 7261110, 7261201, 7261203) With the parking brake ON, the switch is closed and the drive enable relay is energized through wires 6 and 11. When the key is turned to the START position, voltage is supplied to the start circuit through wire 6 to the drive enable relay and wire 9 to the start relay.

For detailed engine information, refer to the engine manufacturer's manual.

For engine starting and stopping procedures refer to STARTING ENGINE and STOPPING ENGINE in SECTION 2 of the OPERATOR’S MANUAL. The engine starting circuit is controlled by a switch located on the parking brake lever which prevents the engine from being started when the parking brake is OFF.

196-13A

196-14A

Voltage is supplied through wire 23 to the coil of the start relay, which closes and supplies voltage through wire 16 to the start solenoid relay, which in turn closes and supplies voltage through wire 12 to close the start solenoid contacts and supply battery power to the starter to turn the engine.

To prevent accidental starting of the engine when the parking brake is OFF, the drive enable relay is de-energized, voltage is not available in wire 9 and therefore the engine cannot be started.

PARKING BRAKE "ON" POSITION

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 pevent relay. Because of this, driving the machine is still not possible until both cab doors are closed and the pilot reset switch is pressed.

To set machine in drive mode, place parking brake OFF to de-energize the drive enable relay and allow voltage to flow to drive prevent relay along wire 66. Close both doors and press the pilot reset switch. This will energize the pilot shut off relay, de-energize the drive prevent relay and allow voltage to flow through wire 36 to energize the drive prevent valve solenoid and allow pilot oil to the drive pedals.

PARKING BRAKE "OFF" POSITION

The parking brake must be ON to allow the engine to start. The engine is started by turning the ignition key to the START position and then releasing it to the RUN position after the engine starts.

196-18A

There is a fuel control valve on the engine that is activated when the key is turned on. It has a pull in coil that is activated by the start solenoid through wire 54 during the start procedure and a holding coil activated through wire13 during the start procedure and when the engine is running.

For schematic diagrams, showing various stages of the START CIRCUIT DIAGRAMS for your serial number in THIS SECTION.

IGNITION SWITCH

If the engine stalls during operation of the vehicle, the key must be turned to the OFF position to be reset before the engine can be restarted.

For schematic diagrams, showing various stages of the START CIRCUIT, refer to pages 4 and 5 of THIS SECTION.

7.2

Tigercat 726B Feller Buncher

Engine

CIRCUIT DESCRIPTION (SERIAL NUMBERS 7261107, 7261202, 7261204 AND UP) With the parking brake ON, the parking brake proximity switch is closed and the drive enable relay is energized through wires 6 and 11. When the key is turned to the START position, voltage is supplied to the start circuit through wire 6 to the drive enable relay and wire 9 to the start relay.

Voltage is supplied through wire 23 to the coil of the start relay, which closes and supplies voltage through wire 16 to the start solenoid relay, which in turn closes and supplies voltage through wire 12 to close the start solenoid contacts and supply battery power to the starter to turn the engine.

213-17A

There is a fuel control valve on the engine that is activated when the key is turned on. It has a pull coil that is activated by the start solenoid which in turn closes the fuel solenoid to supply voltage through wire 54 to the pull in contact during the start procedure. A holding coil is activated through wire 13 during the start procedure and when the engine is running.

FUSE AND RELAY PANEL (COVER REMOVED)

START

DRIVE ENABLE

SAW

RELAY 3

RELAY 4

RELAY 5

5A

8 AUX.

1 GAUGES

DRIVE LOCK

When the parking brake is OFF, the drive enable relay 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.

RELAY 2

15A

10A

2 SAFETY

9 AUX FAN

10A

30A

3 CONTROLS

10 AC / HEATER

10A

20A

4 FUEL

11 LIGHTER

10A

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 prevent relay. Because of this, driving the machine is still not possible until both cab doors are closed and the pilot reset switch is pressed.

To set machine in drive mode, place parking brake OFF to de-energize the drive enable relay and allow voltage to flow to drive prevent relay along wire 66. Close both doors and press the pilot reset switch. This will energize the pilot shut off relay, de-energize the drive prevent relay and allow voltage to flow through wire 36 to energize the drive prevent valve solenoid and allow pilot oil to the drive pedals.

197-5

25A

PILOT LOCK

5 RADIO/DOME

12 F. LIGHTS

15A

15A

RELAY 1

7 ETHER

14 HORN

15A

25A

6 BACK HORN

13 R. LIGHTS

7834A

CAB DOOR SWITCH ON CATERPILLAR ENGINES FUEL CONTROL VALVE IS LOCATED BEHIND FUEL PUMP

For schematic diagrams, showing various stages of the START CIRCUIT DIAGRAMS for your serial number in THIS SECTION.

FUEL CONTROL VALVE

•

267-13

7.3

FUEL CONTROL VALVE (CUMMINS ENGINE)

Tigercat 726B Feller Buncher

Engine

START CIRCUIT DIAGRAMS - START SOLENOID RELAY ONLY (SERIAL NUMBERS 7261001 TO 7261106, 7261108 TO 7261110, 7261201, 7261203) START CIRCUIT - AT REST

720B11

START CIRCUIT - START PARKING BRAKE - ON IGN KEY - START POS.

720B20

7.4

Tigercat 726B Feller Buncher

Engine

START CIRCUIT DIAGRAMS - START SOLENOID RELAY ONLY (SERIAL NUMBERS 7261001 TO 7261106, 7261108 TO 7261110, 7261201, 7261203) START CIRCUIT - RUN, NO DRIVE PARKING BRAKE - OFF PILOT RESET SW. - OFF IGN. KEY - RUN (IGN)

720B22

START CIRCUIT - RUN AND DRIVE PARKING BRAKE - OFF PILOT RESET SW. - ON IGN. KEY - RUN (IGN)

720B21

7.5

Tigercat 726B Feller Buncher

Engine

START CIRCUIT DIAGRAMS - START SOLENOID AND FUEL SOLENOID (SERIAL NUMBERS 7261107, 7261202, 7261204 AND UP) START CIRCUIT - AT REST

720C-20

START CIRCUIT - START MASTER DISCONNECT - ON PARKING BRAKE - ON IGNITION KEY - START POSITION

720C-21

7.6

Tigercat 726B Feller Buncher

Engine

START CIRCUIT DIAGRAMS - START SOLENOID AND FUEL SOLENOID (SERIAL NUMBERS 7261107, 7261202, 7261204 AND UP) START CIRCUIT - RUN, NO DRIVE MASTER DISCONNECT - ON PARKING BRAKE - OFF PILOT RESET SW. - OFF IGNITION KEY - RUN (IGNITION)

720C-22

START CIRCUIT - RUN AND DRIVE MASTER DISCONNECT - ON PARKING BRAKE - OFF PILOT RESET SW. - ON IGNITION KEY - RUN (IGNITION)

720C-23

7.7

Tigercat 726B Feller Buncher

Engine

ENGINE COOLING SYSTEM

When the coolant reaches operating temperature and the thermostat opens, flow is directed to the lower chamber of the radiator top tank, across the top of the radiator core and down through the core to the bottom tank and back to the water pump.

FILLING THE SYSTEM WITH COOLANT The coolant is added through the filler neck in the upper chamber of the radiator top tank and runs slowly down the shunt line. This coolant fills the bottom radiator hose at the water pump and then fills the radiator from the bottom upwards. The air displaced by the coolant discharges from the lower chamber to the upper chamber of the radiator top tank through the baffle vent tube. 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 lower chamber of the radiator has filled. The engine vent discharges air directly from the engine to the upper chamber of the radiator top tank.

The top tank of the engine radiator is divided by a baffle plate into two chambers, an upper and a lower. A small baffle vent tube is the only connection between these two chambers. The anti-freeze/water solution used in the cooling system always contains small amounts of air produced by combustion gas leakage. This air 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 lower chamber of the radiator top tank and are carried up through the baffle vent tube where they collect in the upper chamber 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 baffle vent tube and the engine vent. The system will then require more coolant to fully top off both the engine and the radiator.

An engine vent discharges air directly from the top of the engine to the upper chamber of the radiator top tank.

Additional coolant stored in the upper chamber of the radiator top tank flows slowly down the shunt line to the water pump inlet replacing the air removed from the cooling system.

COOLANT FLOW DURING OPERATION The water pump circulates coolant through the 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.

ENGINE VENT

BAFFLE VENT TUBE

THERMOSTAT (PARTIALLY OPEN)

UPPER CHAMBER LOWER CHAMBER

AFTER COOLER

CYLINDER HEAD

SHUNT LINE RADIATOR CORE

BYPASS

ENGINE BLOCK

720B-24

ENGINE OIL COOLER

WATER PUMP

COOLANT FLOW DURING OPERATION 7.8

BOTTOM TANK

Tigercat 726B Feller Buncher

Engine

TACHOMETER SET-UP

PRECLEANER - ENGINE AIR INTAKE

NOTE: A calibrated “electronic photo tachometer” is required for this procedure.

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.

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

2. The magnetic sensor must be properly installed in the flywheel housing of the diesel engine. The end of the sensor is to be set at 0.030” clearance from the flywheel ring gear teeth. To achieve this, thread the sensor down gently until it touches the ring gear teeth then back it out the amount shown below; Cummins Engine = 1/2 turn.

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

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

Caterpillar Engine = 5/8 turn.

Tighten down the lock nut to hold the sensor in place.

•

3. Air Conditioning/Heater hoses (inside right cab door) may have to be moved out of the way to provide easier access to the back of the tachometer.

• •

4. Place reflecting tape, for electronic tachometer, on crankshaft vibration damper pulley.

•

5. Start engine, and using electronic photo tachometer on damper pulley, adjust throttle so that the engine is running at a constant 2200 rpm.

THE PRECLEANER HAS SPECIALLY DESIGNED BLADES THAT CAUSE THE INCOMING AIR TO SPIN

6. Set the tachometer on the instrument panel to 2200 rpm using a 5/64” (2mm) allen key in the calibration access hole on the back of the tachometer.

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.

NOTE: Calibration access hole is on far side of tachometer. Do not short out the electrical wiring under the panel. Use an insulated (plastic) allen key, which is called an “alignment tool” and is available from most electronics parts supply stores.

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.

NOTE: Tachometer must be calibrated accurately at high R.P.M. (2200 rpm.) The low idle rpm. reading on the instrument panel tachometer may be slightly inaccurate.

7. Reduce engine rpm. to LOW IDLE and then back up to 2200 rpm. on the electronic photo tachometer.

8. Compare instrument panel tachometer against electronic photo tachometer for 2200 rpm. Readjust if necessary.

7.9

Tigercat 726B Feller Buncher

Engine

7.10

Tigercat 726B Feller Buncher

SECTION 8 - DRIVE FEB 99

CONTENTS - SECTION 8 AXLES BRAKE BLEEDING ......................................................................................... 8.19 BRAKE LINING INSPECTION ........................................................................ 8.19 DIAGRAM - REAR AXLE ................................................................................ 8.18 DIFFERENTIAL LOCKS ................................................................................. 8.19 DRAINING THE AXLES .................................................................................. 8.20 FILLING THE AXLES ...................................................................................... 8.20 LUBRICATION ...................................................................................... 8.18, 8.20 OIL CAPACITIES ............................................................................................ 8.20 PLANETARY FINAL DRIVE ............................................................................ 8.18 SERVICE BRAKES ......................................................................................... 8.19 CIRCUIT DESCRIPTION ..................................................................................... 8.2 CIRCUIT DIAGRAM ............................................................................................. 8.3 DRIVE MOTOR SCREW ADJUSTMENTS ........................................................ 8.13 DRIVE PREVENT VALVE ..................................................................................... 8.8 DRIVE PUMP PRESSURE SETTINGS ............................................................. 8.10 FOOT CONTROL VALVE ..................................................................................... 8.8 FRONT DRIVE SHAFT DIAGRAM ....................................................................................................... 8.17 INSTALLATION IN TO MACHINE .................................................................... 8.16 PILLOW BLOCK BEARING ............................................................................ 8.16 HYDRAULIC SYSTEM - CLOSED LOOP ............................................................ 8.2 HYDROSTATIC DRIVE MOTOR DESCRIPTION ................................................................................................. 8.6 SCHEMATIC ..................................................................................................... 8.7 "X" DIMENSION .............................................................................................. 8.12 HYDROSTATIC DRIVE PUMP DESCRIPTION ................................................................................................. 8.4 DIAGRAM ......................................................................................................... 8.5 SCHEMATIC ..................................................................................................... 8.5 PRESSURE SETTINGS DRIVE MOTOR ............................................................................................... 8.12 DRIVE PUMP ................................................................................................. 8.10 TEST DRIVE ........................................................................................................ 8.9 TRANSMISSION SHIFT CABLE ADJUSTMENT ........................................................................ 8.15 SHIFTER ........................................................................................................ 8.15 WHEEL INSTALLATION ..................................................................................... 8.20

Tigercat 726B Feller Buncher HYDROSTATIC DRIVE SYSTEM

Drive 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.

The primary components of a 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 the first 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.

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.

PISTON SLIPPERS

SWASHPLATE, AXIAL PISTON PUMP

LOW PRESSURE RETURN FROM DIESEL ENGINE

TILTABLE SWASHPLATE

BENT AXIS PISTON MOTOR HIGH PRESSURE SUPPLY

TO VEHICLE DRIVE

720B27

CONTINUOUS CLOSED LOOP HYDRAULIC CIRCUIT

8.2

Tigercat 726B Feller Buncher

726B08

Drive

DRIVE CIRCUIT 8.3

Tigercat 726B Feller Buncher

Drive

HYDROSTATIC DRIVE PUMP

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.

When neither of the drive footpedals are depressed, charge pump 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 hydrostatic drive pump is mounted at the top center location of the pump drive gearbox. A spline adapter connects the input driveshaft of the pump directly to the output of the gearbox. The gearbox is driven directly by the diesel engine through a flexible plate coupling.

DOUBLE ELEMENT FILTERS

••

•• 262-20

DRIVE PUMP

••

BOOM/STEER PUMP

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 limit switch is attached to the parking brake lever. When this lever is in the OFF position, the limit switch contacts are open, de-energizing the drive enable relay and energizing the drive prevent valve. With the drive prevent valve energized, drive footpedal 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 both sides of the swashplate control valve, the valve does not move and the pump swashplate angle remains at zero (0o).

••

SAW PUMP

PUMPS

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 destoke 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 motor during rapid acceleration and deceleration or when the drive system stalls.

The hydrostatic drive pump is actually two separate hydraulic pumps mounted in a common case and driven by the same input driveshaft.

The primary pump is a variable displacement, swashplate, axial piston type. This pump is made variable by slipping the pump pistons against a tiltable swashplate cradle. The volume and direction of oil flow from the piston pump is determined by the angle of this 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 (0o). Continuing to angle the swashplate past this neutral position reverses the direction of flow from the piston pump.

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 secondary pump is a fixed displacement, internal gear type which provides charge oil (make-up oil) for the hydrostatic pump and motor as well as providing control oil for the regulation of the primary pump.

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.

8.4

Tigercat 726B Feller Buncher

Drive

The charge pump continuously introduces oil from the hydraulic tank back into the hydrostatic drive system. The charge pump relief valve maintains a constant charge 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 motor to ensure peak hydrostatic drive performance and long service life.

DRIVE SHAFT

CONTROL CYLINDER

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.

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

P

VIEW A

PORT 'A'

TO DRIVE PEDAL CONTROL VALVE

PORT 'A' PRESSURE OVERRIDE VALVE (P.O.R.)

DRIVE PUMP SECTION TO MOTOR (B)

TO MOTOR (A) P.O.R. VALVE

F R

CHARGE PUMP RELIEF HIGH PRESSURE RELIEF VALVE 'B'

SWASHPLATE CONTROL VALVE

HIGH PRESSURE RELIEF VALVE 'A'

CONTROL CYLINDER

HYDROSTATIC PUMP (PISTON) CHARGE PRESSURE FILTER

CHARGE PUMP (GEAR)

Ma TEST PORT

726B05

Mb TEST PORT

DRIVE PUMP SCHEMATIC 8.5

Tigercat 726B Feller Buncher HYDROSTATIC DRIVE MOTOR

Drive A flushing valve is incorporated into the hydrostatic drive motor. This provides a regulated flow of oil from the low pressure side of the closed loop into the motor case. This flow reduces the possibility of the buildup of contamination particles within the closed loop by providing a continuous change of oil. The flushing valve oil also assists in cooling of the hydrostatic drive motor. The flushing valve flow is fixed and no adjustment is required.

The hydrostatic drive motor is mounted directly to the input of the two speed, manually shifted transmission. The output of the transmission is directly connected to the front and rear axles via the driveshafts. The hydrostatic drive motor is a variable displacement, bent axis, axial piston type.

High pressure oil from the hydrostatic pump enters the motor via port A or port B depending on the direction of travel required. This oil is then directed to a set of pistons inside the motor rotating group cylinder housing. These pistons push against the back of the output shaft at an angle, causing the shaft to rotate.

If terrain conditions demand maximum tractive effort at all times, the hydrostatic drive system has a creep capability. The pilot system's creep solenoid valve directs pilot oil to the motor’s internal displacement control cylinder. This holds the hydrostatic drive motor in the maximum displacement position and maximum tractive effort is continuously available.

The piston motor is made variable by changing the angle of the motor rotating group cylinder housing relative to the end of the output shaft. This angle determines the size or displacement of the motor. The displacement determines the output speed and torque of the motor. Increasing the displacement, increases the torque output while reducing the output speed of the motor. Reducing the displacement reduces the torque and increases the speed.

The displacement of the motor is changed by an internal control cylinder which receives high pressure oil from the “begin of stroke” valve. The hydrostatic drive motor normally stays at the smallest displacement in order to drive the machine as fast as possible.

Only when the pressure in the high pressure side of the closed loop exceeds the “begin of stroke” preset level does the displacement of the motor begin to increase.

As the motor displacement automatically increases, the machine speed automatically slows but the motor is able to drive the machine up steeper slopes and to travel on rougher or wetter terrain. As the pressure in the high pressure side of the closed loop falls below the “begin of stroke” pressure, the motor displacement automatically returns to the smallest displacement and the machine speeds up.

8.6

Tigercat 726B Feller Buncher

Drive

FLUSHING VALVE

"BEGIN OF STROKE" VALVE

CONTROL CYLINDER

FROM "CREEP" SOLENOID VALVE (PILOT MANIFOLD)

FROM PUMP (B)

FROM PUMP (A)

DRIVE MOTOR SCHEMATIC

AQ2SC

MINIMUM DISPLACEMENT ADJUSTING SCREW

FLUSHING VALVE 'X'

M1

'X'

A

B

DRIVE SHAFT ROTATING GROUP

'A'

X

G MAXIMUM DISPLACEMENT ADJUSTING SCREW (NO ADJUSTMENT REQUIRED)

VIEW 'A'

BEGIN OF STROKE ADJUSTING SCREW

AQ012-F

DRIVE MOTOR 160cc

8.7

AQ012-G

Tigercat 726B Feller Buncher DRIVE FOOT CONTROL VALVE

Drive DRIVE PREVENT VALVE This solenoid operated spool valve prevents the machine from being driven either forward or in reverse when the parking brake is ON.

This pilot valve is a manually operated directional valve and operates on the same principle as a direct operating pressure reducing valve. Both this foot control valve and the joystick valve use a similar spool arrangement. Operated by foot, this valve directs pilot pressure to the swashplate control valve on the drive pump to drive the machine either forward or reverse.

OPERATING DESCRIPTION When the solenoid valve is de-energized (parking brake ON) the spool connects both drive pilot lines going from the drive foot control to the drive pump, to tank. The same pressure exists in both pilot lines regardless of which foot pedal, forward or reverse, is depressed.

CONNECTOR

SOLENOID

SPOOL SECTION VALVE BLOCK

RR-13

PORT 1

DRIVE PILOT VALVE

FOOT VALVE OPERATING DESCRIPTION In the neutral position the foot pedal (1) is held centered by the return spring (4). When the pedal (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).

•

5

• •

4

•

2

3

•

•

PORT 2 V-04

When the solenoid is energized , the spool shifts and blocks the passage connecting both pilot lines together. This allows forward or reverse pilot pressure to be directed to either end of the drive pump swashplate control valve, allowing the hydrostatic drive pump to provide flow to the drive motor.

1

• • •

•

8 'P' PORT AU013-1

WORK PORTS 1 OR 2

SPOOL ARRANGEMENT

DRIVE PREVENT VALVE

AU013-2

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.

Flow is directly proportional to operator position of the foot pedal and regulating spring characteristic.

8.8

Tigercat 726B Feller Buncher TEST DRIVE

Drive 2. Creep Function: A. Shift transmission to LOW RANGE, turn the creep switch ON, set throttle to FULL, drive machine FORWARD at FULL SPEED. The machine should now move at a much slower speed (approximately 1/4 of previous). Gauge at motor 'M1' port should read ZERO (0 psi.).

This test drive will verify the following: 1. Drive motor 'begin of stroke' control pressure.

2. Creep function.

3. Transmisssion low and high ranges.

4. Front and rear differential lock functions.

B. Turn creep switch OFF, keep at FULL throttle, apply FULL forward drive pedal. Machine should now drive at a much faster speed.

Install a 0 - 5,000 psi. gauge at the 'M1' port of the DRIVE MOTOR, and a 0 - 10,000 psi. gauge at the 'Ma' port of the DRIVE PUMP.

3. Transmission Low and High Ranges:

NOTE: Fasten these gauges so that they can be viewed from the operator’s seat in the cab.

A. Bring machine to a full stop, apply foot brake, set throttle to IDLE and shift to HIGH RANGE.

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.

B. Operate the machine at FULL throttle and FULL forward drive pedal. Speed should be double the low range speed.

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.

C. Bring machine to a full stop, apply foot brake, set throttle to IDLE and shift to LOW RANGE. D. Operate the machine at FULL throttle and FULL forward drive pedal. Speed should be half of the high range speed.

4. Differential Locks:

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.

A. 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.

1. Drive Motor "Begin of Stroke" Control Pressure:

All wheels should rotate as machine is being steered. Steer several times, check all wheels.

A. Shift the transmission to HIGH RANGE, turn ON both front and rear differential locks.

Ensure creep switch is OFF. Set throttle control to FULL.

B. 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.

B. 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.

C. Turn front differential lock switch OFF. Turn rear differential lock switch ON. While steering the machine, both rear wheels should slide.

C. When the 'Ma' gauge on the DRIVE PUMP reads 3700 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.

Note: If these results cannot be obtained, refer to DRIVE MOTOR PRESSURE SETTINGS AND ADJUSTMENTS in THIS SECTION.

8.9

Tigercat 726B Feller Buncher

Drive

DRIVE PUMP PRESSURE SETTINGS AND ADJUSTMENTS

WARNING

Also refer to Chart 1 - DRIVE PUMP PRESSURE SETTINGS in THIS SECTION.

Serious injury could result if transmission is not in HIGH gear. With the transmission in LOW gear, the vehicle will be able to move when setting the relief pressures. Machine must remain stationary during this procedure.

NOTE: Relief valves are set by loosening the locknut and turning the adjusting screw out (counter-clockwise) to reduce the pressure setting and in (clockwise) to increase the pressure setting. Refer to RELIEF VALVES in SECTION 18 of THIS MANUAL.

7. Set engine speed at 1,000 rpm and put the transmission in to HIGH gear.

8. Depress the BRAKE pedal and set the parking brake in the OFF position.

1. Park machine on level ground, lower felling head to the ground and set parking brake ON. Install articulation lock pin and stop engine.

NOTE: Hydrostatic drive system will not operate if the parking brake is not fully OFF. 9. With the aid of an assistant, hold down the brake pedal, and while depressing the FORWARD foot pedal through 1/3 to 1/2 of its full travel set port 'A' relief valve to 5400 psi. with throttle at 1,000 RPM

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

NOTES:

2. Connect a 0-10,000 psi. pressure gauge to port 'MA' on the pump and a 0-1,000 psi. pressure gauge to the test port at port 'G' on the hydrostatic drive pump.

3. Turn both high pressure relief valve adjusting screws (A) and (B) counter-clockwise until the spring tension is completely relieved, then turn both adjusting screws one full turn clockwise.

•

If engine stalling is experienced, increase throttle position just enough to let the engine run smoothly.

•

Machine should not be able to move in HIGH gear with brake pedal depressed.

•

DO NOT set relief pressures with the engine at high RPM’s.

IMPORTANT

Avoid blowing oil over relief longer than 5 seconds, as excessive heating of hydraulic fluid and damage to drive pump can occur.

4. Ensure that the hydraulic oil temperature is between 120°F and 140°F. 5. Turn the pressure override valve (P.O.R.) adjusting screw in (clockwise). Do not overtighten, or breakage will result.

10. Turn off machine, connect same 0-10,000 psi. gauge to port 'MB' and install plug in port 'MA'.

11. Set parking brake ON, start the engine and set throttle to 1,000 rpm.

6. Start the engine and raise to FULL throttle.

Set charge pressure relief valve to 450 psi.

(0-1000 psi. gauge on port "G" of drive pump).

Chart 1 - DRIVE PUMP PRESSURE SETTINGS (WHEN MAKING THESE ADJUSTMENTS ENSURE "CREEP" SWITCH IS IN "OFF" POSITION)

MACHINE

PUMP

P.O.R. (FOR. AND REV.)

MAIN RELIEFS (FOR. AND REV.)

CHARGE PRESSURE

MOTOR

726B

AP024 (90 CC)

4800 PSI @ 2200 RPM

5400 PSI @ 1000 RPM & 1/3 PEDAL

450 PSI @ 2200 RPM

AQ012 (160 CC)

8.10

Tigercat 726B Feller Buncher

Drive

12. Depress the brake pedal and set the parking brake in the OFF position.

IMPORTANT

NOTE: Hydrostatic drive system will not operate if the parking brake is not fully OFF.

To prevent frequent operation of relief valves, it is important that the settings of the high pressure relief valves be substantially higher than the pump P.O.R. setting.

13. With the aid of an assistant, hold down the brake pedal, and while depressing the REVERSE foot pedal through 1/3 to 1/2 of its full travel, set port 'B' relief valve to 5400 psi. with engine at 1,000 RPM. •

If engine stalling is experienced, increase throttle position just enough to let the engine run smoothly.

•

Machine should not be able to move in HIGH gear with brake pedal depressed.

•

DO NOT set relief pressures with the engine at high RPM’s.

15. With the aid of an assistant, hold down the brake pedal, and set throttle to FULL. While depressing the FORWARD foot pedal, set the P.O.R. to 4800 psi.

NOTE: The machine should not be able to move while in HIGH gear with the brake pedal depressed.

16. Set parking brake ON and shut off engine.

17. Remove all gauges and install all plugs.

14. Turn the pump P.O.R. adjusting screw all the way out, counter-clockwise.

CHARGE PRESS. RELIEF

GAUGE TEST PORT 'G'

•

• •

• HIGH PRESSURE RELIEF VALVE 'A'

262-21

MAIN DRIVE PUMP

8.11

GAUGE TEST PORT 'MA'

Tigercat 726B Feller Buncher DRIVE MOTOR PRESSURE SETTINGS AND ADJUSTMENTS

Drive 5. Start the engine, set throttle control to IDLE and put the transmission into HIGH gear.

Place parking brake in the OFF position.

WARNING

WARNING Serious injury could result if transmission is not in HIGH gear. With the transmission in LOW gear, the vehicle will be able to move when setting the relief pressures. Machine must remain stationary during this procedure.

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

6. With the aid of an assistant, hold down the brake pedal while depressing the FORWARD foot pedal. Set the P.O.R. on the hydrostatic drive pump to 3700 psi. at the 'Ma' gauge.

IMPORTANT • When installing a new or rebuilt motor, ensure minimum displacement screw is set correctly.

NOTE: Hydrostatic drive system will not operate if parking brake is not FULLY OFF.

• Improper adjustment of min. displacement adjusting screw can result in motor failure due to overspeeding.

NOTE: The machine should not be able to move while in HIGH gear with the brake pedal depressed.

• It may be necessary to verify the length of adjusting screw used by removing and measuring the screw.

MOTOR "BEGIN OF STROKE" ADJUSTMENT

• Use Chart 2 - Drive Motor Screw Adjustments.

SET MOTOR MINIMUM DISPLACEMENT

1. Park machine on level ground, lower felling head to the ground and set parking brake ON. Install articulation lock pin and stop engine.

1. Park machine on level ground, lower felling head to the ground and set parking brake ON. Install articulation lock pin and stop engine.

2. Ensure the CREEP switch is in the OFF position prior to setting the motor "BEGIN OF STROKE".

2. Check the minimum displacement adjusting screw. The distance from the end of screw to the top of the sealnut ('X' dimension) must be set correctly for the length of screw used.

Refer to CHART 2 - DRIVE MOTOR SCREW ADJUSTMENTS in THIS SECTION.

3. Install a 0-5,000 psi. gauge at the 'M1' port of the hydrostatic drive motor and verify that a 0-10,000 psi. gauge is installed at the 'Ma' port of the hydrostatic drive pump.

4. Place the 'Ma' and the 'M1' gauges close together (at back, close to pump) as they must be watched carefully at the same time during the next steps.

"X"

DIM X

5. With the aid of an assistant, hold down the brake pedal and set throttle to IDLE. Depress the FORWARD foot pedal.

6. Temporarily adjust the pump P.O.R. to read 3000 psi. at the 'Ma' gauge, then slowly turn the pump P.O.R. screw IN to increase the system pressure and watch for the point where the pressure at 'M1' (on motor) increases from zero to 2000 -2600 psi. and then rapidly spikes to over 3000 psi.

MIN. DISPLACEMENT "X" DIMENSION

3. Connect a 0-10,000 psi. pressure gauge to port 'Ma' of the hydrostatic drive pump.

When this happens, the 'Ma' gauge (on pump) should read 3700 psi.(Begin of Stroke). If the spike at 'M1' on motor does not occur when 'Ma' on pump is at 3700 psi., the Begin of Stroke adjustment must be corrected.

4. Ensure that the hydraulic oil temperature is between 120° F and 140° F.

8.12

Tigercat 726B Feller Buncher

Drive

If the pressure at 'M1' spikes to over 3000 psi. before the 'Ma' gauge reaches 3700 psi., the begin of stroke adjusting screw must be backed OUT.

8. With the aid of an assistant, hold down the brake pedal and set throttle to FULL. While depressing the FORWARD foot pedal, reset the P.O.R. on the drive pump to 4800 psi.

If the spike at 'M1' occurs after the 'Ma' gauge passes 3700 psi., the begin of stroke adjusting screw must be turned IN.

NOTE: The machine should not be able to move while the brake pedal is depressed.

9. Set parking brake ON, and shut off engine.

NOTE: This is a sensitive adjustment. Large changes in the gauge reading will be noticed with only a small movement of the adjusting screw. Pressure will change by 500 psi. by turning the screw only 1/8 of a turn.

10. Remove all gauges and reinstall all plugs.

7. Once the screw is locked down, recheck to see that the 'M1' gauge (on motor) reaches 2000 - 2600 psi. and spikes to over 3000 psi. at exactly the same time as the 'Ma' gauge (on pump) reaches 3700 psi.

Chart 2 - DRIVE MOTOR SCREW ADJUSTMENTS (WHEN MAKING THESE ADJUSTMENTS ENSURE "CREEP" SWITCH IS IN "OFF" POSITION)

MACHINE

MOTOR

BEGIN OF STROKE

726B

AQ012 (160 CC)

****3700 PSI @ 1000 RPM

"X" DIMENSION** TOP OF SCREW TO TOP OF NUT 8.6 MM (0.34") ***18.6 MM (0.73") 28.6 MM (1.13")

*LENGTH OF ADJUSTING SCREW

PUMP

M12 X 90 MM (3.5") M12 X 100 MM (3.9") M12 X 110 MM (4.3")

AP024 (90 CC)

* NOTE: ALWAYS CHECK OVERALL LENGTH OF ADJUSTING SCREW BEFORE SETTING THE "X" DIMENSION ON A NEW DRIVE MOTOR **NOTE: THIS IS A SENSITIVE ADJUSTMENT, SIGNIFICANT CHANGES IN SPEED WILL OCCUR WITH ONLY A SMALL MOVEMENT OF THE ADJUSTING SCREW. IT IS IMPORTANT THAT THIS DIMENSION BE WITHIN THE SPECIFIED TOLERANCE: "X" = +0MM/-1MM (+0"/-0.031") *** INDICATES THE ADJUSTING SCREW CUSTOMARILY INSTALLED IN A NEW UNIT **** PRESSURE AT 'M1' PORT ON MOTOR SHOULD "SPIKE" ABOVE 3000 PSI WHEN PUMP GAUGE READS 3700 PSI. SEE PROCEDURE.

MINIMUM DISPLACEMENT ADJUSTING SCREW

FLUSHING VALVE X"

MAXIMUM DISPLACEMENT ADJUSTING SCREW (DO NOT ADJUST)

BEGIN OF STROKE ADJUSTING SCREW

DRIVE MOTOR 160 cc

AQ012-F

8.13

Tigercat 726B Feller Buncher

Drive 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.

TRANSMISSION This is a two speed manual shift transmission.

The transmission drives both the front and rear axles of the machine. Power is supplied by the hydraulic motor mounted to the input side of the transmission. The output shaft transmits power to both the front and rear axles.

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.

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.

IMPORTANT When the transmission is in neutral, never tow the machine at speeds over 2 mph., and never press the forward or reverse pedals, as this will cause significant damage to the transmission.

The transmission must be in neutral for machine to be towed by another vehicle. A tow vehicle of similar size and weight is recommended. For more information on towing, refer to TOWING INSTRUCTIONS in SECTION 2 of the OPERATOR'S MANUAL.

OPERATION 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).

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) LOW GEAR (3)

REAR AXLE

•

•

OUTPUT SHAFT (5) HIGH GEAR (4)

LOW GEAR (3)

LOW SPEED OPERATION 720B15

•

HIGH GEAR (4)

HIGH SPEED OPERATION

TRANSMISSION 8.14

Tigercat 726B Feller Buncher TRANSMISSION SHIFTER

Drive

The transmission shifter is located at the right side, behind the seat. Lever UP is HIGH speed, center is NEUTRAL and DOWN is LOW speed. If required, these positions can be adjusted at the transmission end of the cable. The shifter end of the cable is to remain constant and should be checked for proper setting and tightness.

CABLE ADJUSTMENT At the shifter end, the cable threaded rod end should extend through the clevis and hex nut leaving 7/16" of the rod protruding. Ensure the end of the rod does not contact the shifter bellcrank through its range of motion. Check that all connections are tight and torque cable hold down nuts on the "U" bolt to 70-100 inch pounds.

To shorten or lengthen the cable at the transmission shift lever, 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.

NOTICE TRANSMISSION SHIFT PROCEDURE • BRING MACHINE TO FULL STOP ON LEVEL GROUND • REDUCE ENGINE SPEED TO IDLE

HIGH SPEED

• DEPRESS BRAKE FOOT PEDAL TO APPLY AXLE BRAKES

PULL UP

• MOVE GEARSHIFT LEVER TO ENGAGE DESIRED GEAR • JOG STEERING TO MESH GEARS. DO NOT DEPRESS DRIVE PEDAL

NEUTRAL PUSH DOWN

LOW SPEED

1366A

SHIFTING GEARS WHILE MACHINE IS MOVING WILL RESULT IN TRANSMISSION DAMAGE

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 8.15

Tigercat 726B Feller Buncher

Drive 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.

FRONT DRIVE SHAFT Assembly and installation of a front drive shaft assembly.

1. Park machine on level ground, install articulation lock pin, lower felling head to ground, stop engine, pull parking brake ON and block wheels.

2. Install mid drive shaft and tighten all universal joints. For torque values, refer to TORQUE CHART in SECTION 3 of THIS MANUAL.

NOTE: For this repair, front and rear chassis must be aligned. To align chassis, measure between grease fittings on front and rear axles, to get same reading on each side.

IMPORTANT

2. Remove the upper guards and cover plates and belly pan access door on front chassis.

This mid shaft can be installed backwards.

Large diameter tube end of mid drive shaft fastens to universal joint at the transmission.

3. Remove the mid drive shaft first by separating the two universal joints.

3. Care must be taken before the pillow block bearing bolts can be tightened down. With the front and rear chassis in straight ahead alignment (not turned), the front drive shaft must line up with the center steering articulation pin.

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.

PILLOW BLOCK BEARING INSTALLATION ON TO FRONT DRIVE SHAFT 1. Remove the yoke retaining nut and the yoke from the front drive shaft. Slide pillow block bearing off of the driveshaft. DO NOT clamp the TUBULAR portion of the drive shaft in a vise during any of the assembly process.

NOTE: To align chassis, measure between grease fittings on front and rear axles, to get same reading on each side.

4. Holding the front and rear chassis and the front drive shaft in alignment, tighten the two pillow block bearing bolts (5/8”-11UNC x 2”) with hardened washers under heads, using REMOVABLE (BLUE, #242) LOCTITE and torque to only 80 - 88 lbf-ft. It must be understood that overtorquing will break the pillow block bearing cast mounting lugs.

2. Put anti-seize on the shaft and install the new pillow block bearing with the long extension (set screw side) facing the splined end of the shaft (back of machine). It must slide freely on the shaft.

NOTE: Do not use an impact gun.

3. Using REMOVABLE (BLUE, #242) LOCTITE install the set screw into the slot in the shaft.

The bearing must slide freely along the shaft, for the length of the set screw slot.

5. Slowly add grease, using hand grease gun, until it starts to leak from the bearing. Be careful not to "pop" the grease seal by adding grease too rapidly.

4. Put anti-seize on the shaft splines and install the yoke on to the driveshaft. Install retaining nut hand tight only. Be sure to align front and rear yoke in the same plane (see illustration).

NOTE: DO NOT use a power greaser.

5. Carefully clamp flat wing of yoke in a vise 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 VISE.

8.16

Tigercat 726B Feller Buncher

Drive FRONT AXLE

GREASE LINE PORT FRONT DRIVE SHAFT SET SCREW

PILLOW BLOCK BEARING UNIVERSALS YOKE RETAINING NUT

SPLINES YOKE

TRANSMISSION REAR OUTPUT YOKE

FLAT WING OF YOKE

MID DRIVE SHAFT

TRANSMISSION FRONT OUTPUT YOKE

REAR DRIVE SHAFT

REAR AXLE

5136B

DRIVE SHAFT INSTALLATION 8.17

Tigercat 726B Feller Buncher AXLES

Drive

Power from the drive motor is transmitted to the front and rear axles via the two speed gearbox 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

DIFF. LOCK (BTM.)

BRAKE

The lubricant in both axle assemblies is hydraulic oil. There are drain lines from each axle plumbed to the machine hydraulic system. These drain lines take care of internal leakage from the differential locks and brakes, which use the same hydraulic oil as the machine. Refer also to AXLE LUBRICATION in THIS SECTION.

DRAIN (TOP)

PLANETARY FINAL DRIVE 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.

1

REAR AXLE 27KSM

AXLE HYDRAULIC CONNECTIONS

2 4

6

7

3

5 AXL-3

AXLE ASSEMBLY CROSS SECTION (REAR SHOWN) 8.18

Tigercat 726B Feller Buncher

Drive

DIFFERENTIAL AND DIFFERENTIAL LOCKS

BRAKE LINING INSPECTION

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.

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. They are also in a similar location for the front axle.

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).

This condition provides positive drive to both wheels of the axle when tractive conditions might otherwise allow one wheel to spin.

•

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.

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.

IMPORTANT Differential locks should only be used when additional traction is needed.

SERVICE BRAKES (REAR AXLE ONLY)

SINGLE BRAKE LINE ACTUATES BOTH BRAKES IN REAR AXLE

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.

BLEED SCREWS

SINGLE BRAKE PEDAL

BRAKE DISC BACKING PLATE REAR AXLE ASSEMBLY

AXL-BRK1

PROCEDURE

ANNULAR PISTON

AXL-BRK

DUAL BRAKES (REAR AXLE)

1. Place parking brake ON. 2. Place a clear plastic tube over bleed screw with other end in a container.

ANNULAR BRAKE

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.

3. Start engine and set throttle at IDLE. 4. Loosen bleed screw.

5. Push and hold brake pedal down until brake bleeding is complete (no air bubbles in clear plastic tube).

When the brake foot control pedal in the cab is 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.

6. Tighten bleed screw when oil is free of air.

7. Release brake foot pedal.

8. Repeat above steps for the other bleed screw.

8.19

Tigercat 726B Feller Buncher

Drive

AXLE LUBRICATION

WHEEL INSTALLATION

The axles are allowed to completely fill with oil to the top of the differential case. The hydraulic oil buildup inside the case is due to normal leakage from the differential locks and is used as a lubricant for the differential. The excess oil drains back to the hydraulic tank via the axle drain line.

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.

•

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 will have to be capped to prevent draining the hydraulic tank.

Use tapered assembly studs to help with wheel installation. Two or three studs can be used on each side.

MIN. FULL THREAD

2.17" .79"

.06" x 45°

.406" DRILL

3/4" - 10 UNC OR 7/8" - 14 UNF THREAD

The oil in the axles should be changed whenever the hydraulic oil is changed (seasonal) as the axles are part of the overall hydraulic system and use the same oil.

20°

2.64" 3.41"

IMPORTANT AXL-WHL

Care should be taken to refill the axle(s) before moving the machine after draining.

TAPERED ASSEMBLY STUD

The tapered assembly stud shown can be fabricated to aid in wheel installation on an axle flange.

FILLING THE AXLES The axles must be filled by pumping oil in through the bottom drain plug port. A vent plug at the top of the axle should be removed to allow air to vent out and to allow oil to exit when the axle is full of oil. If ONLY the axles were drained and not the entire hydraulic system, the port from where the drain line was removed will provide the vent and oil will exit here when the axle is full of oil.

The drain line should remain capped until line is reinstalled. Care must be taken to ensure that both axles are completely full of oil and that all plugs, fittings and lines are tight. The top vent plug on the rear axle is accessed from the front, left side and the left guard must be removed (3 bolts). Tilt the left side of the rear axle down for easier access. There are two vent plugs on top of the front axle which can be removed through access holes in the front chassis located near the outer edges of the boom valve. Either plug may be removed, depending on ease of access.

•

Thoroughly clean the wheel bolts, washers and the tapped holes in the axle flange. Two wheel bolt thread sizes are in use. All early machines used 3/4" - UNC bolts. All later machines use 7/8" - UNF. When cleaning threads in flange, double check and be sure to use the proper size tap for the threads.

•

Install the wheel with the aid of the tapered assembly studs.

•

Install wheel bolts by hand to be sure that bolts are not cross threaded.

•

Remove assembly studs and install the remaining bolts.

•

Torque wheel bolts to the following values: 3/4" - 10 UNC torque to 282-310 lbf-ft.

7/8" - 14 UNF torque to 500-550 lbf-ft.

IMPORTANT

CAPACITIES

If an air 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.

For front and rear axle oil fill capacities, refer to the table: SERVICE AND LUBRICATION in SECTION 3 of THIS MANUAL.

8.20

Tigercat 726B Feller Buncher

SECTION 9 BRAKES AND DIFFERENTIAL LOCKS MAR 99

CONTENTS - SECTION 9 BRAKES 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 ADJUSTMENT .................................................................................................... 9.4 LINING REPLACEMENT .................................................................................... 9.5 SERIAL NUMBER 7261001 TO 7261094............................................................ 9.6 SERIAL NUMBER 7261095 AND UP ................................................................. 9.6

Tigercat 726B Feller Buncher

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 pilot valve (foot pedal). The oil from the accumulator side of the check valve is sent to the brake pilot valve to operate the rear axle brakes.

The accumulator will hold sufficient pressure, after the engine stalls or is shut down, for up to five (5) brake applications. Beyond this, the pressure drops substantially. For further information on accumulators, refer to SECTION 5 of THIS MANUAL.

To release hydraulic pressure in the brake system, refer to RELEASE PILOT SYSTEM PRESSURE in SECTION 5 of THIS MANUAL. BRAKE PEDAL

••

CIRCUIT DESCRIPTIONS 213-20

BRAKES CIRCUIT

BRAKE PEDAL

BRAKE PILOT VALVE (FOOT PEDAL) 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 is provided to the brakes in the rear axle from the accumulator. A reaction piston in the valve senses this increase in brake pressure and relays feedback to the operator, ie. as brake pressure increases the pedal effort increases proportionately.

A positive stop in the brake valve limits the brake pressure to a preset value. This preset value is determined by the requirement 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.

When the pedal is released, the spool returns to its neutral position and allows the brake cylinders to drain to tank.

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 two accumulators. The brake accumulator comes precharged to 700 psi. No pressure adjustments are required for the brake accumulator charge valve.

DIFFERENTIAL LOCKS CIRCUIT The differential locks in both front and rear axles are controlled by two switches located on the control panel in the cab. The switches control two solenoid pilot valves in ports "C1" and "C5" of the pilot manifold. Placing the switches in the ON position energizes the solenoid pilot valves which direct pilot oil to the differential lock clutch packs in one or both axles to lock the differentials. Refer also to DIFFERENTIAL AND DIFFERENTIAL LOCKS in SECTION 8 of THIS MANUAL.

CROSS SECTION OF VALVE BODY

T A P

MO-01

BRAKE PILOT VALVE 9.2

MO-02

Tigercat 726B Feller Buncher

720B05

Brakes and Differential Locks

BRAKE AND DIFFERENTIAL LOCK CIRCUITS 9.3

Tigercat 726B Feller Buncher PARKING BRAKE

Brakes and Differential Locks

OPERATION The parking brake lever is located beside the operator’s seat. Pulling up on the lever engages the disc brake caliper on the transmission output shaft and closes the limit switch mounted on the side of the parking brake. The limit switch activates the drive prevent circuit, to prevent the machine from being driven when the parking brake is applied. The brake can be adjusted at the lever end and the brake caliper end.

ADJUSTMENT The brake is properly adjusted when:

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. Loosen the two inner and outer locking nuts on the center adjusting bolt.

A. Resistance is encountered half way through the brake lever’s travel.

B. The machine can be held stationary while attempting to drive forward in HIGH gear at full throttle.

NOTE: The drive prevent limit switch on the brake lever must be disconnected for this test.

WARNING Drive prevent limit switch must be reconnected immediately after testing is completed.

3. Rotate the caliper actuating lever to one of the following positions: (older machines with vertical brake cable post - 11:00 o’clock) (newer machines without brake cable post 5:00 o’clock) 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.

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.

The parking brake must be kept properly adjusted at all times and should be lubricated every 500 hours under normal operating conditions.

Lever end:

CALIPER 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.

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)

Limit switch: Check to see that this switch will activate the drive prevent circuit.

This switch can be adjusted by loosening the two jam nuts and adjusting the location of the switch, so that the activating pin will operate the switch.

Caliper end: The parking brake assembly is a ball and ramp, sliding caliper brake. It has an open caliper design to facilitate changing the linings and a retraction spring to reduce drag.

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

WARNING

INNER ADJ. NUT OUTER ADJ. NUT

All brake adjustments and service must be followed by a test drive using these procedures and then checked for proper caliper "float".

PARKBRK3

9.4

BRAKE CALIPER

Tigercat 726B Feller Buncher

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.

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 insure that "anti-seize" gets into bores of caliper plates.

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.

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.

7. See previous procedure: caliper adjustment to complete adjustment of new brake linings.

CALIPER MOUNTING NUTS (2) SLEEVES (2)

•

REAR CALIPER TORQUE PLATE

•

•

•

CALIPER MOUNTING BOLTS (2)

RUBBER BOOT

•

•

• •

THRUST WASHER

•

• •

•

•

•

INNER SEAL (RUBBER)

(3) BALL BEARINGS

•

ADJUSTING NUTS (2)

FRONT CALIPER TORQUE PLATE

•

•

LEVER STAINLESS WASHER

SPRING CARRIER AND LINING ASSEMBLY

HARDENED WASHER

•

CENTER ADJUSTING BOLT

•

OUTER CAM

INNER CAM RETAINER

BRAKE CALIPER ASSEMBLY SERIAL NUMBER 7261001 AND UP

BN136-4

9.5

Tigercat 726B Feller Buncher

Brakes and Differential Locks

MOUNTING BRACKET

CLEVIS JAMNUTS SPRING WASHER LEVER

ADJ. NUTS CLEVIS PIN

COTTER PIN

CALIPER ASSEMBLY

BRAKE CABLE PARKING BRAKE LEVER LIMIT SWITCH ASSEMBLY LOCKING SET SCREW •

PARKING BRAKE ASSEMBLY SERIAL NUMBER 7261001 TO 7261094

726B02

MOUNTING BRACKET

CALIPER ASSEMBLY

PARKING BRAKE LEVER LIMIT SWITCH ASSEMBLY •

LOCKING SET SCREW SPRING WASHER

ADJ. NUTS

BRAKE CABLE

JAMNUTS LEVER COTTER PIN

CLEVIS

CLEVIS PIN

726B03

PARKING BRAKE ASSEMBLY SERIAL NUMBER 7261095 AND UP 9.6

Tigercat 726B Feller Buncher

SECTION 10 - OIL COOLER FEB 99

CONTENTS - SECTION 10 CIRCUIT DESCRIPTION .............................................. 2 CIRCUIT DIAGRAM ...................................................... 3 CLEANING. SEE OPERATOR'S MANUAL OIL COOLER OPERATION ........................................... 2

Tigercat 726B Feller Buncher

Oil Cooler

OIL COOLER The hydraulic oil cooler and engine radiator are mounted fore and aft in front of the engine. The oil cooler is closest to the engine. The A/C condenser core is mounted in front of these two units. A debris screen, at the very front, is used to protect the complete cooling assembly.

The engine fan draws air from behind the cab, through the engine doors and the debris screen.

This air passes through the A/C condenser and radiator cores then through the oil cooler and is blown across the engine. This cooling assembly must be checked daily for accumulation of debris.

A/C CONDENSER CORE

For detailed cleaning procedures, refer to CLEANING A/C CONDENSER, OIL COOLER AND RADIATOR in SECTION 2 of the OPERATOR’S MANUAL. CIRCUIT DESCRIPTION A large volume of oil travels through the oil cooler before returning to the hydraulic tank. The boom/ steer pump and saw pump take oil from the reservoir and send it to the boom/saw valve. This oil returns to the oil cooler from the outlet section of the boom/saw valve. Cooling of the oil occurs as air is drawn through the oil cooler core. Cooled oil then passes through the dual head return filter and in to the hydraulic reservoir.

A check valve, installed in the line at the dual head filter, prevents the reservoir from being drained in the event of the boom valve drain line (routed through the center joint area) being damaged.

Oil may be added to the system by means of the hand fill pump. For filling instructions, refer to HYDRAULIC HAND FILL PUMP in SECTION 2 of the OPERATOR’S MANUAL.

10.2

DEBRIS SCREEN

231-21

OIL COOLER AND RADIATOR ASSEMBLY

Tigercat 726B Feller Buncher

726B04

Oil Cooler

OIL COOLER CIRCUIT (WITH SAW ATTACHMENT) 10.3

Tigercat 726B Feller Buncher

Oil Cooler

10.4

Tigercat 726B Feller Buncher

SECTION 11- STEERING & CENTER JOINT FEB 99

CONTENTS - SECTION 11 CENTER JOINT ADJUSTMENT .................................................................................................... 11.8 CHECKING ......................................................................................................... 11.8 DIAGRAM ........................................................................................................... 11.9 GREASE SEALS ................................................................................................ 11.9 LUBRICATION .................................................................................................... 11.8 MAINTENANCE .................................................................................................. 11.8 CIRCUIT DESCRIPTION ....................................................................................... 11.5 CIRCUIT DIAGRAM ............................................................................................... 11.6 JOYSTICK CONTROL VALVE ................................................................................ 11.4 OPERATING DESCRIPTION .............................................................................. 11.5 PRESSURE SETTINGS ......................................................................................... 11.7 RELIEF VALVE ....................................................................................................... 11.4 SAFETY ................................................................................................................. 11.7 STEER CONTROL VALVES JOYSTICK .......................................................................................................... 11.4 MAIN VALVE ....................................................................................................... 11.3 MAIN VALVE CROSS SECTION ......................................................................... 11.3 RELIEF VALVE .................................................................................................... 11.4 STEER/BOOM PUMP ............................................................................................ 11.2

Tigercat 726B Feller Buncher

Steering and Center Joint

STEER/BOOM PUMP A double vane pump is mounted to the lower left of the pump drive gearbox. The pump drive shaft is connected to the gearbox via a splined adapter.

The output from the shaft end vane pump section supplies hydraulic oil for the boom and clamp functions. The cover end section supplies hydraulic oil for the steering, brake and differential lock functions and oil to the pilot circuit.

This pump requires no adjustments, system relief valves are located either in the line or on the control valve. Fluid flow is developed in each pump section by a cartridge which consists of a cam ring, a rotating rotor with vanes, side plates and support plates.

• CAM RING WALL

As the rotor rotates, the vanes are forced up against the oval shaped cam ring wall transferring oil from the inlet port to the outlet port of each pump section.

VANE-1

COVER END CARTRIDGE (STEER)

AP009-3

TYPICAL VANE PUMP

SHAFT END CARTRIDGE (BOOM)

STEER/BOOM PUMP SECTION

11.2

Tigercat 726B Feller Buncher

Steering and Center Joint

STEER CONTROL VALVES The steer circuit incorporates a joystick pilot valve, a pilot operated steer control valve and a main relief valve which also controls the pressure to the accumulator charge valve. The accumulator charge valve receives oil from the steer pump and directs oil to the steer control valve.

The steer valve, main relief valve and the accumulator charge valve are all located in the rear chassis on the left side wall beside the engine.

STEER VALVE OPERATING DESCRIPTION The control valve 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.

Oil from the fixed displacement steer pump via the accumulator charge valve, enters the inlet section and is allowed to pass through the open center spool section and back to tank via the outlet section.

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 oil pressure being applied to either end of the spool.

ACCUMULATOR CHARGE VALVE

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 these relief valves is diverted back to tank via the tank passage in the spool section and the outlet section.

• •

RELIEF VALVE

•• MAIN CONTROL VALVE

•• 267-11

For a detailed description of these relief valves, refer to RELIEF VALVES in SECTION 18 of THIS MANUAL.

STEER VALVE LOCATIONS

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

STEER VALVE CROSS SECTION

11.3

Tigercat 726B Feller Buncher

Steering and Center Joint

STEER RELIEF VALVE The steer relief valve protects the steer pump and steer circuit from over pressurizing.

JOYSTICK CONTROL VALVE 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 spool valve then shifts from its centre position and directs pump flow to operate the corresponding cylinder.

ADJUSTING SCREW LOCKNUT

TANK

PRESSURE RPGC

RELIEF CARTRIDGE

GAUGE TEST PORT

25-17A

••

RELIEF VALVE

The valve is adjusted by loosening the locknut and turning the hex head screw. Turning the hex head screw clockwise increases the pressure setting and counter-clockwise decreases the pressure setting. Once the pressure is set correctly, tighten the locknut and re-check the pressure setting. Provision has been made in the base of this valve to connect a pressure gauge.

RR-12

11.4

JOYSTICK PILOT VALVE

Tigercat 726B Feller Buncher

Steering and Center Joint

JOYSTICK OPERATING DESCRIPTION In the neutral position the joystick lever is held centered by return spring (4).

STEER CIRCUIT DESCRIPTION Two steer cylinders are used to steer the machine. Operating oil is supplied from a fixed displacement pump via the brake 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.

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).

•

•

5

• •

4 3

• •

•

2

•

Moving the joystick to the LEFT directs pilot oil to the "B" 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.

1

•

Moving the joystick to the RIGHT directs pilot oil to the "A" 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 via the outlet section of the steer valve.

'P' PORT WORK PORTS 2 OR 4

AU013-2

SPOOL ARRANGEMENT

AU013-1

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.

Flow 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.

11.5

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.

A steer circuit MAIN RELIEF VALVE, set lower than the port relief valves, is installed in the line between the pump supply and the accumulator charge valve. This protects the system by preventing the system pressure from getting higher than the preset value. Higher system pressures will cause the main 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.

Tigercat 726B Feller Buncher

720B04

Steering and Center Joint

STEER CIRCUIT DIAGRAM 11.6

Tigercat 726B Feller Buncher PRESSURE SETTINGS

Steering and Center Joint 3. Turn the steer main relief adjusting screw all the way in and then back out two turns.

NOTE: Refer to RELIEF VALVE ADJUSTING PROCEDURE in SECTION 18 of THIS MANUAL. Before starting this procedure, read the following safety precautions:~

4. Turn both port relief adjusting screws on steer valve out until spring pressure is relieved.

5. Start the engine and put the throttle control to the IDLE position.

• Wear safety glasses and safety shoes when working on or around machine.

• Never stand in articulating zone of machine during set-up. Stand on the opposite side 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.

7. While attempting to STEER the machine to the LEFT, set the PORT "B" relief to 3200 p.s.i.

8. Turn steer main relief all the way out.

RETAINING PIN

9. Move the throttle control to the FULL position.

•• LYNCH PIN

10. While attempting to STEER the machine either RIGHT or LEFT, set the steer main relief valve pressure to 2500 psi.

••

MAIN RELIEF (2500 PSI) - 1/2" WRENCH - 9/16" WRENCH

• •

195-24

Avoid blowing oil over relief longer than 5 seconds, as excessive heating of hydraulic fluid and damage to boom pump can occur.

6. While attempting to STEER the machine to the RIGHT, set the PORT "A" relief on the steer valve to 3200 p.s.i.

• Be sure to use lynch pins when installing articulation lock pin. Vibration and the motion of steering could work retaining pins upward.

ARTICULATION LOCK PIN

IMPORTANT

••

INSTALL ARTICULATION LOCK PIN

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

TEST PORT

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

2. Install a 0-5000 psi. pressure gauge to the gauge test port in the base of the steer relief valve.

25-17A

••

STEER MAIN RELIEF

11. Remove pressure gauge and wipe up any excess oil in test port area.

12. Remove the articulation lock pin and place it in the storage position.

11.7

Tigercat 726B Feller Buncher

Steering and Center Joint 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.

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.

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

CENTER JOINT PRELOAD ADJUSTMENT Before making any adjustments to the center joint, please follow CHECKING THE CENTER JOINT BEARING procedure in THIS SECTION.

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.

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).

CHECKING THE CENTER JOINT PRELOAD 1. Park the machine on level ground. Set parking brake ON and shut off engine.

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.

11.8

Tigercat 726B Feller Buncher

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) may not have been the thinnest shim in the pack.

Repeat steps 7 through 11, replacing this shim and removing only the thinnest shim from the bottom shim pack (item 9).

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.

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 blue 243 Locktite (removable) and torque the six bolts (item 7) for the bearing retainer plate (item 8) to 80 - 88 lbf-ft.

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.

TORQUE TO 282 - 310 LBF-FT. NO LOCKTITE REQUIRED

•

1

•

GREASE SEALS WITH SPRINGS FACING UPWARD

REAR CHASSIS 11

• •

• FRONT CHASSIS • 6

• • •

726B09

• • •

10 3

2 TORQUE TO 282 - 310 LBF-FT. NO LOCKTITE REQUIRED

4 5

• GREASE SEALS WITH SPRINGS FACING DOWN

9

• CENTER JOINT 11.9

8 7 TORQUE TO 80 - 88 LBF-FT. USE 243 LOCKTITE (REMOVABLE)

Tigercat 726B Feller Buncher

Steering and Center Joint

11.10

Tigercat 726B Feller Buncher

SECTION 12 - LIFT BOOM FEB 99

CONTENTS - SECTION 12 BOOM CONTROL VALVE ASSEMBLY PROCEDURE .......................................................................... 12.5 CROSS SECTION OF SPOOL SECTION ................................................... 12.3 OPERATING DESCRIPTION ....................................................................... 12.3 RELIEF VALVES. SEE SECTION 18 - CLAMPS WITH SAW JOYSTICK CONTROL VALVE ......................................................................... 12.2 LIFT CIRCUIT DESCRIPTION ........................................................................ 12.3 PRESSURE SETTINGS .................................................................................. 12.6 PUMP, DESCRIPTION BOOM, CLAMPS & STEER. SEE SECTION 11 - STEERING SAFETY .......................................................................................................... 12.6

Tigercat 726B Feller Buncher

Lift boom

JOYSTICK CONTROL VALVE LIFT BOOM 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 main control valve pilot end caps. The corresponding spool valve then shifts from its centre position and directs pump flow to operate the corresponding cylinder.

JOYSTICK OPERATING DESCRIPTION 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.

RR-12

JOYSTICK PILOT VALVE

Flow is directly proportional to the operator position of the joystick and the regulating spring characteristic.

'P' PORT

AUO13-2

12.2

•

•

5

• •

4 3

• •

•

2

•

•

WORK PORTS 1, 2, 3 OR 4

SPOOL ARRANGEMENT

1

Tigercat 726B Feller Buncher BOOM CONTROL VALVE

Lift boom LIFT BOOM CIRCUIT DESCRIPTION

The boom valve consists of four open center spool sections and one mid inlet section. A fifth spool section is installed along with one end inlet section to control either the saw or the shear.

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.

The boom valve in use will vary depending on whether a saw attachment or bunching shear is being used. The location of the lift spool section in the boom control valve will also vary depending upon the machine serial number. Refer to the boom control valve illustrations in THIS SECTION for proper orientation. Which ever valve is used, the following circuit description and pressure setting procedures will apply for both.

CONTROL VALVE OPERATING DESCRIPTION Oil enters the mid. 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).

Two cylinders are used to raise and lower the felling head. The cylinders receive oil from a fixed displacement pump via the lift spool section in the boom control valve. The spool section in this control valve is pilot operated at both ends. It receives pilot oil from the right 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 dual head return oil filter.

To prevent over pressurizing of the operating circuits, each work port in the valve sections (except for the saw) has a port relief valve.

A main relief valve is installed in both the mid inlet section and the saw inlet section of the valve.

The mid 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 SECTION 18 of THIS MANUAL.

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 726B Feller Buncher

Lift boom

**NOTE** SHEAR AND CLAMP SPOOL SECTION FOR BUNCHING SHEAR INSTALLATIONS

• LIFT 'UP' PORT RELIEF (2900 psi)

LIFT 'DOWN' PORT RELIEF (2200 psi)

•

LIFT

•

GAUGE TEST PORT

•

•

•

MID. INLET SECTION

• **NOTE** SHEAR AND CLAMP SPOOL SECTION FOR BUNCHING SHEAR INSTALLATIONS

AT023B

BOOM CONTROL VALVE WITH SAW

12.4

MAIN RELIEF (2600 psi)

Tigercat 726B Feller Buncher 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, aload 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 auxilliary 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 followingsections during assembly.

12.5

Tigercat 726B Feller Buncher PRESSURE SETTINGS

Lift boom 6. Start the engine, and put the throttle control to the IDLE position.

NOTE: Refer to RELIEF VALVE ADJUSTING PROCEDURE in SECTION 18 of THIS MANUAL.

7. While holding the joystick in the LIFT UP position (fully extended), check gauge pressure reading.

Before starting this procedure, read the following safety precautions:~

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.

• Never reach between boom crank arms or link arms during machine set-up.

• Wear safety glasses and safety shoes when working on shears.

IMPORTANT

• Do not stand on top or inside of boom arms.

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 lift boom cylinder lock before working on or around machine with boom raised. Always install "T" handle retainer bolt. Never use this device to set boom down pressure.

8. 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.

1. Park machine on level ground. Completely raise lift boom. Set parking brake ON. Install articulation lock pin, block wheels and stop engine.

9. While holding the joystick in the LIFT DOWN position (fully retracted), check gauge pressure reading. Front wheels may lift off ground.

WARNING

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.

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

IMPORTANT 2. 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.

Never run engine at full throttle with main relief turned all the way in.

10. Stop engine, unscrew main relief adjusting screw three(3) full turns.

11. Start engine and move the throttle control to the FULL position.

3. Connect a 0 - 5000 p.s.i. pressure gauge (with at least 4' of hose) to the boom control valve test port on the elbow at the mid. inlet section.

12. While holding the joystick in the LIFT DOWN position, check gauge pressure reading.

4. Turn the boom main relief adjusting screw all the way in.

If less than 2600 psi., release pressure in rod end of lift cylinders and allow felling head to sit on the ground. Stop engine and readjust main relief. Repeat above procedure until a gauge reading of 2600 psi. is obtained.

5. Turn both port relief valve adjusting screws on the lift spool section of the valve out until spring pressure is relieved then turn adjusting screws one full turn in.

13. Remove pressure gauge and wipe up any excess oil from test port area.

IMPORTANT Never run engine at full throttle with main relief turned all the way in.

12.6

Tigercat 726B Feller Buncher

726B06

Lift boom

LIFT BOOM CIRCUIT (SHOWN WITH SAW VALVE SECTION) 12.7

Tigercat 726B Feller Buncher

Lift boom

12.8

Tigercat 726B Feller Buncher

SECTION 13 - TILT FEB 99

CONTENTS - SECTION 13 BOOM CONTROL VALVE BUNCHING SHEAR INSTALLATIONS ................................................................ 13.2 CIRCUIT DESCRIPTION ....................................................................................... 13.2 CIRCUIT DIAGRAM CONTROL VALVES ................................................................................................ 13.2 PRESSURE SETTINGS ......................................................................................... 13.4 SAFETY ................................................................................................................. 13.4

Tigercat 726B Feller Buncher CONTROL VALVES

Tilt TILT CIRCUIT DESCRIPTION

For a complete description of the main control valve, refer to BOOM CONTROL 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. Refer to the boom control valve illustrations in THIS SECTION for proper orientation. Which ever valve is used, the following circuit description and pressure setting procedures will apply for both.

For a complete description of the joystick pilot valve, refer to JOYSTICK CONTROL VALVE in SECTION 12 of THIS MANUAL.

The control valve is located on the front chassis above the front axle and behind the cover plate.

Two cylinders are used to tilt the felling head forward and back. The cylinders receive oil from a fixed displacement pump via the tilt spool section in the boom control valve. The spool section in this control valve is pilot operated at both ends. It receives pilot oil from the 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 dual head return filter.

TILT 'OUT' PORT RELIEF (2900 psi) TILT 'IN' PORT RELIEF (2900 psi)

**NOTE**

TILT

• •

•

CLAMP

SHEAR AND CLAMP SPOOL SECTION FOR BUNCHING SHEAR INSTALLATIONS

ACCUM

LIFT GAUGE TEST PORT

• MID. INLET SECTION

•

• SAW

• **NOTE** SHEAR AND CLAMP SPOOL SECTION FOR BUNCHING SHEAR INSTALLATIONS

AT023A

BOOM CONTROL VALVE WITH SAW

13.2

MAIN RELIEF (2600 psi)

Tigercat 726B Feller Buncher

720B27

Tilt

TILT CIRCUIT (SHOWN WITH SAW VALVE SECTION) 13.3

Tigercat 726B Feller Buncher PRESSURE SETTINGS

Tilt IMPORTANT

NOTE: Refer to RELIEF VALVE ADJUSTING PROCEDURE in SECTION 18 of THIS MANUAL.

Never run engine at full throttle with main relief turned all the way 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.

IMPORTANT

• Wear safety glasses and safety shoes when working on shears.

During the following procedures, DO NOT hold any function control for longer than 5 seconds.

• Do not stand on top or inside of boom arms.

7. While holding the joystick in the TILT OUT position (fully extended), check gauge pressure reading.

• Always install lift boom cylinder lock before working on or around machine with boom raised. Always install "T" handle retainer bolt. Never use this device to set boom down pressure.

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.

WARNING

8. While holding the joystick in the TILT IN position (fully retracted), check gauge pressure reading.

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

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.

1. Park machine on level ground. Completely raise lift boom. Set parking brake ON. Install articulation lock pin, block wheels and stop engine.

9. Stop engine, unscrew main relief adjusting screw 3 full turns.

IMPORTANT Before starting engine, ensure both port relief valves are unscrewed as stated in paragraph 5, or damage could occur to the piston pump.

WARNING Before performing work under the felling head or lift boom, install the lift boom cylinder lock.

10. Start engine and move the throttle control to the FULL position.

2. 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 Never run engine at full throttle with main relief turned all the way in.

3. Connect a 0 - 5000 p.s.i. pressure gauge (with at least 4' of hose) to the test port on the elbow at the mid. inlet section of the boom control valve .

4. Turn the boom main relief adjusting screw all the way in.

5. Turn both port relief valve adjusting screws on the tilt spool section of the boom valve out until spring pressure is relieved then turn adjusting screws one full turn in.

11. 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 main relief.

Repeat above procedure until a gauge reading of 2600 psi. is obtained.

12. Remove pressure gauge and wipe up any excess oil from test port area.

13.4

Tigercat 726B Feller Buncher

SECTION 17 - SAW DRIVE FEB 99

CONTENTS - SECTION 17 CIRCUIT DESCRIPTION ................................................................................ 17.4 CIRCUIT DIAGRAM ........................................................................................ 17.5 PRESSURE SETTINGS .................................................................................. 17.6 SAFETY .......................................................................................................... 17.6 SAW CONTROL VALVES MAIN ............................................................................................................ 17.3 PILOT .......................................................................................................... 17.2 SAW MOTOR. SEE SAW MANUFACTURER'S MANUAL SAW PUMP P.O.R. VALVE ............................................................................................... 17.7 TEST PORT ................................................................................................. 17.7

Tigercat 726B Feller Buncher

Saw drive

SAW CONTROL VALVES The saw circuit is controlled by a solenoid operated pilot valve in the pilot manifold and a pilot operated main control valve.

For a description of the PILOT MANIFOLD refer to SECTION 5 of THIS MANUAL. The main saw valve is part of the boom valve. It consists of an open center spool section and an inlet section containing a relief valve.

Four other spool sections along with one mid inlet section control the boom and clamp functions.

Each spool section is pilot operated.

An outlet section directs return oil back to tank via the oil cooler and dual head return oil filter.

For a detailed boom valve description, refer to SECTION 12 of THIS MANUAL. PILOT VALVE OPERATING DESCRIPTION An electrical signal from the saw switch in the cab energizes the solenoid at the pilot manifold (C8) to shift the spool and direct pilot oil to one end of the spool section of the main saw valve.

SOLENOID TO SAW SWITCH

• TO BOOM/SAW MAIN VALVE

•

TEST PORT

• • C8

720B16

PILOT MANIFOLD (SAW)

17.2

Tigercat 726B Feller Buncher

Saw drive PARALLEL PASSAGE

LOAD CHECK VALVE

A

PLUG

WORK PORT BRIDGE

B PLUG

PILOT END CAP PILOT END CAP

90136-4

SPOOL CENTERING SPRING

SPOOL TANK PASSAGE

THRU' NEUTRAL PASSAGE

CROSS SECTION OF SAW SPOOL SECTION

MAIN VALVE OPERATING DESCRIPTION Oil (system pressure) enters the end inlet section of the main control valve and is allowed to pass through the saw spool section and the tank passages of the boom spool sections and back to tank via the outlet section.

SAW/BOOM CONTROL VALVE

SAW SPOOL SECTION

The saw spool section has a self centering, three 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 one end of the spool from C8 port of the pilot manifold. Shifting the spool directs oil from the saw pump to the saw motor.

SAW RELIEF TO GAUGE ON SIDESTAND

SAW INLET SECTION

71-A

OUTLET SECTION

•

The relief valve installed in the saw inlet section of the main saw valve is to protect the pump in case of failure of the P.O.R. on the pump.

The relief valve diverts oil to tank via the tank passages in the spool sections and the outlet section of the boom valve. It also functions as an anti-cavitation relief valve.

For a detailed description of relief valves, refer to RELIEF VALVES in SECTION 18 of THIS MANUAL. SAW END INLET SECTION TO GAUGE ON SIDESTAND

AT023S

17.3

•

• •

SAW RELIEF (3900 psi)

SAW/BOOM CONTROL VALVE

Tigercat 726B Feller Buncher

Saw drive

SAW CIRCUIT DESCRIPTION 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 hydraulic pump mounted on the pump drive gearbox supplies oil flow to the motor via the saw control valve. The main saw control valve is pilot operated and controls the flow of hydraulic oil from the pump to the motor. A relief valve is installed in the inlet section of the main saw control valve.

A solenoid operated pilot valve in the pilot manifold controls the flow of pilot oil to the end of the spool in the main control valve.

The saw 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 saw relay to the saw pilot valve solenoid.

An electrical signal from the saw switch energizes the solenoid in the pilot valve to shift the spool and direct pilot oil to one end of the spool section of the main saw control valve.

NOTE: The saw 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 SWITCH and PILOT RESET SWITCH in SECTION 2 of the OPERATOR'S MANUAL. IMPORTANT To maximize pump and motor life, do not shut the engine off until the saw blade has come to a complete stop.

With the saw switch in the OFF position, the solenoid operated pilot valve is in the deenergized position preventing pilot oil flow from shifting the spool in the main saw control valve.

Because the stand-by valve adjusting screw mounted on the back of the pump is screwed completely in, oil flow is blocked to the swashplate control piston leaving the pump set at maximum displacement.

In this condition the pump is at maximum displacement pumping oil to the main saw control valve, through the "open center" spool in the valve and back to tank.

17.4

With the saw switch in the ON position, the solenoid operated pilot valve is in the energized position directing pilot oil to shift the spool in main saw control valve. This will direct oil from the saw pump to the saw motor, causing the system pressure to rise and start to turn the saw blade.

When the pressure (system pressure) builds up to 3600 p.s.i. the spool in the pump P.O.R. valve shifts to direct oil to the pump swashplate control piston. The piston moves the swashplate to the near neutral position to cut back the flow of oil while at the same time maintaining the pressure and continuing to turn the blade.

This system leads to less horsepower requirement and less heat generation since the pump stops pumping instead of dumping hydraulic oil over relief valves.

The saw motor adjusts its displacement in response to system pressure.

For explanation of saw motor, refer to SAW HEAD MANUFACTURER'S MANUAL.

Tigercat 726B Feller Buncher

720B03

Saw drive

SAW CIRCUIT DIAGRAM Tigercat DW5000 (19") and DW5600 ( 22") Bunching Saws Koehring Waterous 18" and 20" Felling Heads 17.5

Tigercat 726B Feller Buncher

Saw drive

PRESSURE SETTINGS

1. Park machine on level ground, lower saw head to the ground, and set parking brake ON. Install articulation lock pin, 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:~ • Never assume that other workers are aware of disc saw dangers.

WARNING

• Do not point the discharge side of the saw toward people, vehicles, buildings, or the machine.

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

• 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.

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 ".

• A slowly rotating blade can crush bones.

Beware pinch points when rotating blade by hand.

4. Check the torque on both the saw blade mounting bolts and the saw tooth mounting bolts.

• Never operate the saw head inside of a building and warn others to keep clear of the area.

5. Properly install the saw blade guard using all hardware provided. Guard must be secure.

• 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.

6. Block saw blade from rotating as outlined in saw head manufacturer’s manual.

7. Clear area under the saw of all loose dirt, stones, wood and debris.

8. Keep saw head 6" off the ground (15 cm).

9. Warn all persons to stay clear of area and especially the discharge side of saw head.

• 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.

WARNING Workers on the ground should stand behind the wheels or undercarriage of the machine to provide an added barrier to thrown objects.

• 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.

17.6

Tigercat 726B Feller Buncher

Saw drive SAW/BOOM CONTROL VALVE

SAW PUMP SAW PUMP

SAW SPOOL SECTION SAW RELIEF (3900 psi)

GAUGE TEST PORT

TO GAUGE ON SIDESTAND

P.O.R. ADJUSTING SCREW

SAW INLET SECTION

71-A

12. Screw relief valve adjusting screw on saw control valve out until spring pressure is relieved.

88-20A

10. Install a 0-5000 psi. pressure gauge in test port on SAW PUMP for use when working at rear of machine.

IMPORTANT SAW GAUGE

Before starting engine, ensure relief valve is unscrewed as stated in paragraph 12, or damage could occur to the piston pump.

13. Start the engine and put throttle control to the IDLE position. Ensure the hydraulic oil temperature is between 1200F and 1400F. 14. Turn the saw switch ON.

213-24

NOTE:Close both doors and press pilot reset switch to operate the saw.

Use gauge on sidestand when adjusting saw valve relief at front of machine.

15. Set the saw control valve relief pressure to 3900 psi. (Gauge on sidestand).

NOTE: Refer to RELIEF VALVE ADJUSTING PROCEDURE in SECTION 18 of THIS MANUAL.

SAW PUMP (HOSES REMOVED FOR CLARITY)

16. Set P.O.R. valve on SAW PUMP to 3600 p.s.i.

(Gauge at rear of machine).

PUMP BODY

17. Remove pressure gauge and wipe up any excess oil from test port area.

P.O.R. VALVE (3600 psi)

SET MOTOR P.O.R. (BEGIN OF STROKE)

STAND-BY VALVE (SCREWED FULLY IN)

25-22A

11/16" WRENCH 3mm ALLEN WRENCH

11. Screw P.O.R. valve adjusting screw on the saw pump all the way in.

NOTE: Stand-by valve on pump is not used for this application, therefore adjusting screw should remain screwed fully in.

17.7

SET MOTOR MINIMUM DISPLACEMENT Refer to the attachment manufacturer's own OPERATOR AND MAINTENANCE MANUAL for this information.

Tigercat 726B Feller Buncher

Saw drive

17.8

Tigercat 726B Feller Buncher

SECTION 18 - CLAMPS WITH SAW MAR. 99

CONTENTS - SECTION 18 CIRCUIT DESCRIPTION ................................................................................ 18.6 CIRCUIT DIAGRAM ........................................................................................ 18.8 CONTROL VALVES ......................................................................................... 18.2 PILOT LINE PRESSURES. SEE SECTION 5 - PILOT SYSTEM PRESSURE SETTINGS .................................................................................. 18.6 RELIEF VALVES ADJUSTING PROCEDURE ......................................................................... 18.5 OPERATION ................................................................................................ 18.4 SPOOL SECTION DIAGRAM ......................................................................... 18.3

Tigercat 726B Feller Buncher CONTROL VALVES

Clamps with Saw There are two inlet sections. The end inlet is for the saw spool section and receives oil from the variable displacement saw pump. The mid inlet is for the remaining four spool sections and it receives oil from the fixed displacement boom pump.

The clamp and accumulating arm circuits are controlled by a foot operated pilot valve (clamp), two solenoid operated pilot valves in the pilot manifold (accumulator) and a pilot operated boom and saw main control valve.

All five 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. For a complete description of the foot operated pilot valve, refer to FOOT CONTROL VALVE in SECTION 8 of THIS MANUAL.

Cartridge type relief valves are installed in both work ports of the clamp spool section and both work ports in the accumulator spool section. The mid inlet has a single relief valve. These protect the circuits (pumps) from high pressures during operation.

MAIN CONTROL VALVE This valve is part of the boom valve and is located on the front chassis above the front axle and behind the cover plate. It uses one of the five spool sections 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

•

•

ACCUMULATOR 'OPEN' PORT RELIEF (3200 PSI)

•

•

MAIN RELIEF (2600 PSI)

MID. INLET SECTION

GAUGE TEST PORT (IN ELBOW)

•

•

SAW RELIEF

END INLET SECTION

BOOM AND SAW MAIN CONTROL VALVE AT023ACC

Tigercat DW5000 (19") and DW5600 (22") Bunching Saws Koehring Waterous 20" Disc Saws 18.2

Tigercat 726B Feller Buncher

Clamps with Saw

MAIN VALVE OPERATING DESCRIPTION Oil from the variable displacement saw pump enters the end inlet section of the boom and saw main control valve and is allowed to pass through the open center saw spool section and the tank passages of the boom and clamps spool sections and back to tank via the outlet section.

The spools are shifted one way or the other by pilot oil pressure being applied to either end of the spool.

Shifting the spool(s) directs oil from the saw pump to the saw or from the fixed displacement Boom Pump to the clamp and accumulating cylinders.

The relief valves installed in the saw and clamp spool section of the main boom valve are to protect the pump in case of failure of the P.O.R. valve on the pump.

Also, oil from the fixed displacement boom pump enters the mid inlet section of the boom and saw main control valve and is allowed to pass through the four open center spool sections and back to tank via the outlet section.

All of the relief valves on the main boom and saw 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 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.

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 CLAMP SPOOL SECTION

18.3

Tigercat 726B Feller Buncher

Clamps with Saw 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 18.4

Tigercat 726B Feller Buncher

Clamps with Saw

ANTI-CAVITATION RELIEF VALVE ADJUSTING PROCEDURE ADJUSTING NUT

•

JAMNUT

•

51055-2

RELIEF VALVE

1.

Loosen jamnut.

2.

Turn adjusting nut to obtain desired pressure reading on gauge.

3.

Lock jamnut against adjusting nut using 6 - 8 lbf - ft., 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.

18.5

Tigercat 726B Feller Buncher CLAMPS WITH SAW

Clamps with Saw PRESSURE SETTINGS

Tigercat DW5000 (19") and DW5600 (22") Bunching Saw Heads.

NOTE: Refer to RELIEF VALVE ADJUSTING PROCEDURE earlier in this section.

Koehring Waterous 20" Saw Heads.

Before starting this procedure, read the following safety precautions:~

NOTE: Circuit using a Tigercat attachment (with single clamp and accum. arms) is described below. Circuit is identical for Koehring Waterous attachments but there are dual clamp and accum. arms.

CIRCUIT DESCRIPTION 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 main control valve.

The clamp arm is operated by the foot pedals on the left side of the cab floor. The left pedal 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.

The accumulating arm is operated by a 3 position thumb switch OPEN/CLOSE (self centering to OFF) located on the right joystick control lever.

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.

• Never reach between boom crank arms or link arms during machine setup.

• Wear safety glasses and safety shoes when working on shears.

• 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 .

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

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

2. Completely raise lift boom and place locking device over one of the two cylinder rods. For complete installation procedure, refer to LIFT BOOM CYLINDER LOCK in SECTION 12 of THIS MANUAL.

WARNING Do not stand above or below the felling head and lift boom or between the boom and front chassis during this procedure.

18.6

Tigercat 726B Feller Buncher

Clamps with Saw

TO SET CLAMP AND ACCUMULATOR OPEN AND CLOSE RELIEF VALVES 3. Connect a 0 - 5000 p.s.i. pressure gauge (with at least 4' of hose) to the test port on the elbow at the mid inlet section of the boom control valve.

4. Turn the boom mid inlet main relief adjusting screw all the way in.

IMPORTANT Avoid blowing oil over relief longer than 5 seconds, as excessive heating of hydraulic fluid and damage to boom pump can occur. above procedure until a gauge reading of 3200 psi. is obtained.

IMPORTANT Never run engine at full throttle with main relief turned all the way in.

9. 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.

5. Turn the port relief valve adjusting screws on both the accumulator and clamp spool section of the control valve out until spring pressure is relieved then turn adjusting screws one full turn in.

10. While holding the right joystick thumb switch to the right in the ACCUMULATING ARM CLOSE position (accumulator cylinder fully extended), check gauge pressure reading.

6. Start the engine, and put the throttle control to the IDLE position.

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.

IMPORTANT During the following procedures, DO NOT hold any function control in the on position for longer than 5 seconds.

IMPORTANT 7. While holding the left foot pedal down in the CLAMP OPEN position (cylinder fully retracted), check gauge pressure reading.

Never run engine at full throttle with main relief turned all the way in.

If less than 1100 psi., stop engine and readjust clamp open port relief. Repeat above procedure until a gauge reading of

11. Stop engine, unscrew mid inlet main relief adjusting screw 3 full turns.

12. Start engine and move the throttle control to the FULL position.

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.

1100 psi. is obtained.

8. While holding the right foot pedal down in the CLAMP CLOSE position (cylinder fully extended), check gauge pressure reading.

13. 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.

14. Remove pressure gauge and wipe up any excess oil from test port area.

SET PILOT LINE PRESSURES To set pilot pressures, refer to SECTION 5 of THIS MANUAL.

If less than 3200 psi., stop engine and readjust clamp close port relief. Repeat

18.7

Tigercat 726B Feller Buncher

Clamps with Saw

ACCUMULATING AND CLAMP ARMS CIRCUIT Tigercat DW5000 (19") and DW5600 (22") Bunching Saws Koehring Waterous 20" Disc Saws 720B01

18.8

Tigercat 726B Feller Buncher

SECTION 19 - SHEAR WITH CLAMPS MAR. 99

CONTENTS - SECTION 19 CIRCUIT DESCRIPTION ................................................................................. 19.4 CIRCUIT DIAGRAM ......................................................................................... 19.5 CONTROL VALVES ......................................................................................... 19.2 FOOT OPERATED PILOT VALVE. SEE SECTION 8 - DRIVE MAIN SHEAR AND CLAMPS VALVE DIAGRAM .................................................................................................... 19.2 OPERATING DESCRIPTION ........................................................................ 19.3 SPOOL SECTION ........................................................................................ 19.3 PRESSURE SETTINGS .................................................................................. 19.6 SAFETY .......................................................................................................... 19.6 SHEAR PUMP P.O.R. VALVE ............................................................................................... 19.7 TEST PORT ................................................................................................. 19.7

Tigercat 726B Feller Buncher

Shear with Clamps

SHEAR WITH CLAMPS Tigercat 18" and 20" Bunching Shears CONTROL VALVES The shear/clamp and accumulating arm circuits are controlled by two solenoid operated pilot valves in the pilot manifold, a foot operated pilot valve and a pilot operated boom and shear main control valve.

For a description of the PILOT MANIFOLD refer to SECTION 5 of THIS MANUAL. For a complete description of the foot operated pilot valve refer to FOOT CONTROL VALVE in SECTION 8 of THIS MANUAL.

OUTLET SECTION

• SHEAR 'OPEN' PORT RELIEF (3200 psi)

PLUG (NO PORT RELIEF) SHEAR AND CLAMP

• ACCUMULATOR ARM 'CLOSE' PORT RELIEF (3200 psi)

•

ACCUM.

• •

GAUGE TEST PORT FOR ACCUM. ARM AND SHEAR OPEN

MAIN RELIEF (2600 psi)

•

MID. INLET SECTION SHEAR/CLAMP 'CLOSE' PORT RELIEF (3700 psi) END INLET SECTION

3713AIL2

ACCUMULATOR ARM 'OPEN' PORT RELIEF (3200 psi)

•

• SHEAR AND CLAMP

•

•

•

CLAMP 'OPEN' PORT RELIEF (3700 psi)

• GAUGE TEST PORT FOR SHEAR/CLAMP CLOSE AND CLAMP OPEN

BOOM AND SHEAR MAIN CONTROL VALVE

19.2

Tigercat 726B Feller Buncher RELIEF VALVE PORT 'A'

Shear with Clamps 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 SHEAR/CLAMP SPOOL SECTION (END)

MAIN CONTROL VALVE The main shear and clamps valve is part of the boom valve and is located on the front chassis above the front axle and behind the cover plate.

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.

It uses two of the five spool sections to open and close the shear/clamp and a third spool section to open and close the accumulating arm.

The spools are shifted one way or the other by pilot oil pressure being applied to either end of the spool.

There are two inlet sections, the end inlet is for the shear close spool section and receives oil from the variable displacement shear pump. The mid inlet is for the remaining four spool sections and it receives oil from the fixed displacement boom pump.

Shifting the spool(s) directs oil from the shear pump (and or vane pump) to the shear, clamp and accumulating cylinders.

The relief valves installed in the first shear/clamp spool section of the main shear valve are to protect the pump in case of failure of the P.O.R. valve on the pump.

All five spools in the valve are open center type.

Each spool section is pilot operated.

All of the relief valves on the main boom and shear 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.

An outlet section directs return oil back to tank.

Cartridge type relief valves are installed in both work ports of the first shear/clamp spool section, the mid inlet , the shear open work port of the second shear/clamp spool section and both work ports in the accumulating arm spool section.

These protect the circuits (pumps) from high pressures during operation.

For descriptions of relief valves, refer to RELIEF VALVES in SECTION 18 of THIS MANUAL.

MAIN VALVE OPERATING DESCRIPTION Oil from the variable displacement shear pump enters the end inlet section of the boom and shear main control valve and is allowed to pass through the open center shear spool section and the tank passages of the boom and clamps spool sections and back to tank via the outlet section.

Also, oil from the fixed displacement boom pump enters the mid inlet section of the boom and shear main control valve and is allowed to pass through the four open center spool sections and back to tank via the outlet section.

19.3

Tigercat 726B Feller Buncher CIRCUIT DESCRIPTION

Shear with Clamps

The shear, clamp arm, and accumulating arm are each operated by separate cylinders. A variable displacement piston pump and a fixed displacement pump supply oil to the cylinders via three spool sections in the boom and shear main control valve.

The shear and clamp arm open and close together and are operated by the two LEFT foot pedals, one pedal to OPEN and one to CLOSE. Pressing the CLAMP/SHEAR OPEN pedal directs pilot oil to shift the spools in both shear/clamp spool sections.

The first spool section at the front of the valve directs oil from the shear (piston) pump to the rod end of the clamp cylinder to open the clamp arm.

The second spool section located next to the accumulator section, directs oil from the fixed displacement pump to the rod end of the shear cylinder to open the shear.

Pressing the CLAMP/SHEAR CLOSE pedal directs pilot oil to the opposite end of both spools to shift them in the opposite direction.

In this case oil from both pumps combines at the manifold on the shear head providing additional flow to close the shear and clamp faster and together.

The accumulating arm is operated by a 3 position thumb switch OPEN/CLOSE (self centering to OFF) located on the right joystick control lever.

The switch operates two solenoid pilot valves which direct pilot oil to the accumulating spool section of the boom and shear control valve to shift the spool. The spool directs oil from the fixed displacement boom 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 filter.

19.4

Tigercat 726B Feller Buncher

720B02 (3/99)

Shear with Clamps

SHEAR WITH CLAMPS CIRCUIT 19.5

Tigercat 726B Feller Buncher

Shear with Clamps

PRESSURE SETTINGS Before starting this procedure, read the following safety precautions:~ • Do not assume that other workers are aware of the dangers associated with shears.

SHEAR AND CLAMP

• Because of background noise, a closing (or opening) shear is virtually silent.

ACCUM

• Shear blades and clamp arms open and close very rapidly, always keep clear of operating area.

TEST PORTS ON ELBOWS

•

• Keep clamp and accumulator arms closed whenever possible during setup.

SHEAR AND CLAMP

•

• Never reach between boom crank arms or link arms during machine setup.

BOOM AND SHEAR MAIN VALVE 1. Completely raise lift boom and place locking device over one of the two cylinder rods. For complete installation procedure, refer to LIFT BOOM CYLINDER LOCK in SECTION 12 of THIS MANUAL. 3717AIL2

• Do not stand on top or inside of boom arms.

• When a shear is attached to a machine, the blade mounting bolts must be retorqued.

• Wear safety glasses and safety shoes when working on shears.

• Park machine on level ground, lower shear head to the ground, and set parking brake ON. Install articulation lock pin, block wheels and stop engine.

TO SET SHEAR OPEN AND ACCUMULATOR OPEN AND CLOSE RELIEF VALVES:-

• Check for foreign objects (wood, stones, nuts, bolts, etc.) resting on or around the blades. Make sure all tools and spare parts are removed from the shear area. If shear closes on any object, injury may occur from propelled objects or pieces.

2. Connect a 0 - 5000 p.s.i. pressure gauge (with at least 4' of hose) to the test port on the elbow at the mid inlet section of the boom and shear control valve.

Refer to RELIEF VALVE ADJUSTING PROCEDURE in SECTION 18 of THIS MANUAL.

3. Turn the boom mid inlet main relief adjusting screw all the way in.

• Check torque on blade mounting bolts.

4. Turn the port relief valve adjusting screws on both the accumulating and clamp spool sections of the control valve out until spring pressure is relieved then turn adjusting screws one full turn in.

• Warn everyone to stay away from the shear head and the immediate area.

• Slowly close the shear blade and check for proper clearances, alignment and operation.

IMPORTANT Never run engine at full throttle with main relief turned all the way in.

WARNING

5. Start the engine, and set throttle to IDLE. To prevent injury caused by accidental steering of the machine when setting pressures, make sure the articulation lock pin is held securely in place by the lynch pins provided.

6. While holding the foot pedal in the CLAMP/ SHEAR OPEN position (shear cylinder fully retracted), check gauge pressure reading.

NOTE: Do not hold function in the ON position for longer than 5 seconds.

WARNING Before performing work under the felling head or lift boom, install the lift boom cylinder lock.

19.6

If less than 3200 psi., stop engine and readjust shear open port relief. Repeat above procedure until a gauge reading of 3200 psi. is obtained.

Tigercat 726B Feller Buncher

Shear with Clamps TO SET SHEAR/CLAMP CLOSE AND CLAMP OPEN RELIEF VALVES:-

7. While holding the right joystick thumb switch in the ACCUMULATING ARM OPEN position (accumulating cylinder fully retracted), check gauge pressure reading.

13. Connect a 0 - 5000 p.s.i. pressure gauge (with at least 4' of hose) to test port on the end inlet section of the boom and shear control valve.

IMPORTANT

14. Connect a 0-5000 psi. pressure gauge in test port on SHEAR PUMP for use when working at rear of machine.

Avoid blowing oil over relief for longer than 5 seconds, as this will cause excessive heating of the hydraulic fluid and possible damage to the boom pump.

SHEAR PUMP, VARIABLE DISPLACEMENT

If less than 3200 psi., stop engine and readjust accumulating arm open port relief.

Repeat above procedure until a gauge reading of 3200 psi. is obtained.

SHEAR PUMP

8. While holding the right joystick thumb switch in the ACCUMULATING ARM CLOSE position (accumulating cylinder fully extended), check gauge pressure reading.

GAUGE TEST PORT

If less than 3200 psi., stop engine and readjust accumulating arm close port relief.

Repeat above procedure until a gauge reading of 3200 psi. is obtained.

9. Stop engine, unscrew mid inlet main relief adjusting screw 3 full turns.

88-17A

IMPORTANT

SHEAR PUMP (HOSES REMOVED FOR CLARITY)

Never run engine at full throttle with main relief turned all the way in.

10. Start engine and move the throttle control to the FULL position.

PUMP BODY

11. While holding the joystick thumb switch in the ACCUMULATING ARM OPEN position, check gauge pressure reading.

P.O.R. VALVE (3600 PSI)

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.

STAND-BY VALVE (SCREWED FULLY IN) 11/16" WRENCH 3MM ALLEN WRENCH

12. Remove pressure gauge and wipe up any excess oil from test port area.

25-22A

15. At the SHEAR PUMP, screw the P.O.R. valve adjusting screw all the way in.

NOTE: Stand-by valve on pump is not used for this application, therefore adjusting screw should remain screwed fully in.

Continued on page 8

19.7

Tigercat 726B Feller Buncher

Shear with Clamps

16. At the valve, unscrew both port relief valve adjusting screws on the shear spool section until spring pressure is relieved.

IMPORTANT Before starting engine, ensure both port relief valves are unscrewed as stated in paragraph 16, or damage could occur to the piston pump.

17. Start the engine, and put the throttle control to the IDLE position.

18. While holding the foot pedal in the SHEAR/ CLAMP CLOSED position (shear and clamp cylinders fully extended) check gauge pressure reading.

If less than 3700 psi., stop engine and readjust clamp/shear close port relief. Repeat above procedure until a gauge reading of 3700 psi. is obtained.

NOTE: Engine RPM may have to be increased a small amount to prevent stalling.

19. While holding the foot pedal in the SHEAR/ CLAMP OPEN position (clamp cylinder fully retracted), check gauge pressure reading.

If less than 3700 psi., stop engine and readjust clamp open port relief. Repeat above procedure until a gauge reading of 3700 psi. is obtained.

20. While holding the foot pedal in the SHEAR/ CLAMP OPEN position (clamp cylinder fully retracted), set P.O.R. valve on pump to 3500 psi. on gauge at rear of machine.

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

WARNING

Do not stand above or below the felling head and lift boom or between the boom and front chassis during these procedures.

SET PILOT LINE PRESSURES NOTE: Refer to PILOT PRESSURE SETTINGS in SECTION 5 of THIS MANUAL.

19.8