Tigercat 720D FELLER BUNCHER Service Manual - PDF DOWNLOAD

SERVICE MANUAL Tigercat 720D FELLER BUNCHER ISSUE 1.1, 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, RADIATOR AND CROSS-FLOW FAN .................................................... 10 STEERING ...................................................................................................................... 11 LIFT BOOM ..................................................................................................................... 12 TILT ................................................................................................................................. 13 SAW DRIVE .................................................................................................................... 17 CLAMPS WITH SAW ...................................................................................................... 18

720dsm00

720D Available Literature Operator's Manual ............................... Part No. Service Manual .................................... Part No. Parts Catalog ....................................... Part No. Hydraulic Adapters Book ..................... Part No. Hose Assemblies Book ....................... Part No.

18872A 18873A 18871A 1472A 3707A

Tigercat

®

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

Tigercat 720D Feller Buncher

Introduction

ii

Tigercat 720D Feller Buncher

Introduction

Tigercat 720D 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 720D Feller Buncher.

The operator's manual will assist the operator with the techniques of proper and safe operation of the 720D 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.

720D-01

iii

Tigercat 720D 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 modifications take place.

Tigercat may officially grant approval for modifications only by: i. Written approval of repairs or modifications signed by the Tigercat Engineering Manager; or ii. Approved modifications officially released by Tigercat.

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

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

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

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

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

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

Tigercat Industries Inc.

iv

Tigercat 720D 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 720D Feller Buncher

Introduction

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Tigercat 720D Feller Buncher

SECTION 1 - SAFETY MARCH 2003

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

Read and understand all manuals for any attachments or accessories.

CONTENTS - SECTION 1 ARTICULATION LOCK BAR ........................................................................ 1.12 BOOM LIFT LOCK ....................................................................................... 1.12 ENGINE ACCESS PANELS ......................................................................... 1.10 FELLING TREES ........................................................................................... 1.7 FIRE PREVENTION ..................................................................................... 1.14 FIRE PREVENTION GUIDELINES ........................................................... 1.14 WHAT ELSE TO DO BEFORE YOU EXPERIENCE A FIRE .................... 1.15 WHAT TO DO AFTER A FIRE ................................................................. 1.16 WHAT TO DO IN CASE OF A MACHINE FIRE ........................................ 1.15 PARKING THE MACHINE ............................................................................. 1.8 SAFETY INTERLOCK SWITCHES ON CAB DOORS ................................... 1.9 SAFETY PRECAUTIONS, GENERAL ........................................................... 1.3 SAFETY PRECAUTIONS, OPERATING ....................................................... 1.6 SAFETY PRECAUTIONS, SERVICING ....................................................... 1.10 SAFETY SYMBOLS ....................................................................................... 1.2

Tigercat 720D 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.

1.2

Tigercat 720D Feller Buncher

Safety

GENERAL SAFETY PRECAUTIONS

KEEP BACK 500 FEET

Remember that safety is a prime responsibility of all.

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

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

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

DANGER ROTATING SAW The safety of persons outside the cab is the responsibility of the machine operator

Follow all instructions from safety inspector and supervisors.

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

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.

Do not let an untrained person operate the machine.

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 try to climb onto or off a moving machine.

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

Do not use the machine foot controls as a step.

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

1.3

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

Tigercat 720D Feller Buncher

Safety

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

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

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

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

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

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

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

Machine should be washed completely at every major service.

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

If these are found, Do Not Touch!!!

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

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

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

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

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

Check windows and door guards for damage.

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

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

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

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

Check all fluid levels.

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

1.4

Tigercat 720D Feller Buncher

Safety WARNING WARNING

GENERAL SAFETY PRECAUTIONS continued

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

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

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

Wash hands after handling.

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

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

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

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

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

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

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

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

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

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

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

1.5

Tigercat 720D 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.

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

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

Sound the machine horn before starting the machine.

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

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

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

Keep the brake properly adjusted at all times.

Start the engine according to the instructions in this manual. Refer to OPERATING MACHINE in SECTION 2 of the OPERATOR'S MANUAL. Before moving the machine to the work site, check to ensure that all doors, panels, and access covers are installed properly and secured.

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

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

Secure loose items in the cab.

1.6

Tigercat 720D Feller Buncher

Safety

OPERATING SAFETY PRECAUTIONS continued

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

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

NEVER travel across a STEEP slope or side hill:

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

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

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.

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

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

Serious injury or death could result from crushing.

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.

FELLING TREES Pieces of wood, debris from the ground and even teeth separating from the saw blade become potentially dangerous missiles when thrown from these machines.

Inspect saw teeth, tooth retaining bolts, saw disc and felling head assembly.

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

Ensure that all saw tooth retaining bolts are at correct torque value.

Replace all worn saw teeth or rotate worn teeth to align unused cutting tips.

Do not turn on saw blade until machine is at cutting site.

Always replace saw tooth retaining bolts when replacing saw teeth.

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

Inspect saw disc for stress cracks and that saw disc does not wobble due to worn saw shaft bearings.

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

Use only prearranged and approved signalling practices.

Never start the machine if the saw blade has missing teeth, teeth retaining bolts or a bent saw disc.

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

Shut down machine immediately if vibration occurs during cutting.

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

Check that the saw discharge area is clear and undamaged.

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

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

1.7

Tigercat 720D Feller Buncher

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

OPERATING SAFETY PRECAUTIONS continued When moving from tree to tree with the saw blade turning, take care not to make contact with other vegetation or debris.

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

Do not over load felling head.

Park on level ground.

Work within your operating skills, do not attempt to cut down a tree that is too large for the felling head.

Do not park on a hillside or incline.

Lower felling attachment onto level ground.

Operate so that the chip discharge area of the felling head is not directed at people, livestock, buildings or other machines.

Engage the parking brake.

Stop the engine and release pilot system pressure by performing the following steps:

When parking the machine:

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

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

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

When making the cut, properly position felling head in front of tree and have saw blade running at full rpm.

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

Always know and control the direction the tree will fall to prevent injury to co-workers or damage other vehicles.

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

Use caution when loosening hydraulic connections.

When backing away from a cut, watch out for obstacles in your path.

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

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

Never use this machine to clear a logging deck on a new tract of timber when the rest of the equipment and operator's are also moving in. Preplan to clear decks in advance before other equipment arrives.

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

Stop the saw blade before leaving the cutting area. NOTE: The saw blade will continue to free wheel for several minutes after the saw switch has been turned OFF.

To stop the blade from rotating, CAREFULLY lower the saw blade onto a stump. This should be done gently to prevent unnecessary loading of the saw blade, saw housing and bearings.

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

1.8

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

Tigercat 720D Feller Buncher

Safety SWITCH

OPERATING SAFETY PRECAUTIONS continued

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.

ACTUATOR

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.

INTERLOCK SWITCH (L.H. DOOR SHOWN)

197-5

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

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

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

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

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.

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

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

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

1.9

Tigercat 720D Feller Buncher

Safety LOWER ACCESS PANELS

SERVICING SAFETY PRECAUTIONS

RETAINING BRACKETS

724D-D14

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

LOWER ACCESS PANELS

CAUTION The LOWER engine compartment access panels on a standard configuration are NOT HINGED or permanently attached to the machine, the UPPER doors when closed hold the LOWER panels in place. Once an UPPER DOOR is opened remove the LOWER panel from the machine. DO NOT apply any weight or pressure to the LOWER panel. DO NOT use these LOWER panels as hand grips, when servicing the machine.

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

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

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

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

UPPER DOORS

HAND KNOB

HAND KNOB

LOWER ACCESS PANELS 724D-D15

This machine is equipped with a reversible cooling fan to facilitate cleaning of the radiator/oil cooler assembly and engine compartment doors.

Exercise care when working in this area with the engine running. If the fan switch in the cab is in the AUTO position, the fan could turn ON and/or go into REVERSE mode.

Prior to welding on any part of the machine, it should be cleaned and a fire extinguisher should be made available at the welding location. Care must be taken in attaching the welding machine grounding clamp so electrical current does not pass through bearings, especially the center joint bearing. Also, disconnect the positive (+) battery cable from both batteries.

STANDARD ENGINE ACCESS PANELS

1.10

Tigercat 720D Feller Buncher

Safety 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.

SERVICING SAFETY PRECAUTIONS continued WARNING

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

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.

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

Never use bare hand to check for fluid leaks.

Fluid leaks under pressure may not be visible.

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

Pressure can be maintained in a hydraulic system long after the power source and pump have been shut down. Lower the felling head to the ground, stop engine and relieve trapped pressure from pilot system and brake accumulators before before performing work on components, or disconnecting any hoses. For the procedure on how to RELIEVE PRESSURE, refer to PARKING THE MACHINE in THIS SECTION.

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

1.11

Tigercat 720D Feller Buncher

Safety

SERVICING SAFETY PRECAUTIONS continued

WARNING

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

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

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

CAUTION

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

195-24

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

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

FRAME ARTICULATION LOCK BAR

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

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

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

WARNING Always allow the saw blade to come to a COMPLETE STOP before approaching saw head to make adjustments.

1.12

Tigercat 720D Feller Buncher

Safety

SERVICING SAFETY PRECAUTIONS continued

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

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

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

Dispose of fluids properly.

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

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

1.13

Tigercat 720D Feller Buncher

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

FIRE PREVENTION

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

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

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

1. Maintain a CHARGED fire extinguisher on the machine at all times and KNOW HOW TO USE IT.

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.

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.

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.

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

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.

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

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

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

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.

1.14

Tigercat 720D Feller Buncher FIRE PREVENTION continued

Safety WHAT TO DO IN CASE OF A MACHINE FIRE

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

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.

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.

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

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

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

Use the PASS method with most extinguishers.

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

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

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.

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.

Continued on page 16

*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.

1.15

Tigercat 720D Feller Buncher FIRE PREVENTION continued Continued from page 15

20229A

Safety WHAT TO DO AFTER A FIRE

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

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

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

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

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.

1.16

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

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

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

Tigercat

5211A • R2-1101

PAGE 1 OF 16

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using high speed disc saws safely FORWARD:

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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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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

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

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

THROW ANGLE

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

•

•

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

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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.

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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.

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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

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

FIGURE 7a

PLAN VIEW OF MACHINE SHOWING CLOCKWISE AND COUNTERCLOCKWISE BLADE ROTATION

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

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

9

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using high speed disc saws safely Comments and Instructions cont.

Tigercat

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

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

SLAB

•

SLAB

• FE

ED

IN

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

TH DIR ROW EC TIO N

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

FIGURE 8

THROW ENGAGEMENT DISTANCE FELLING HEAD MOVING INTO SLAB/LOG

®

SLAB

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

• •

FIGURE 8b SIDE VIEW

FEED IN

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

10

FIGURE 8c TOP VIEW

using high speed disc saws safely Comments and Instructions cont.

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

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

• FE

ED

IN

FELLING HEAD MOVING INTO LOG PILE

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

SMALL LOG

THROW ENGAGEMENT DISTANCE LOG PILE

FEED IN

•

•

A SAW HOUSING WITHOUT SNOUTS ALLOWS A LONG THROW ENGAGEMENT DISTANCE

FIGURE 9b SIDE VIEW

FIGURE 9c TOP VIEW

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

FEED IN

11

using high speed disc saws safely Comments and Instructions cont.

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

UNCUT TREE OR STUMP BACKUP THROW ENGAGEMENT DISTANCE

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

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

FELLING HEAD MOVING INTO LOG

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

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

FELLING HEAD MOVING INTO STUMP (FEED SPEED)

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

12

using high speed disc saws safely Comments and Instructions cont.

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

THROW GAP

FIGURE 12: SAW BLADE THROW GAP

13

using high speed disc saws safely Comments and Instructions cont.

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

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

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

FIGURE 13: SAW BLADE ENTRANCE AND EXIT SPACE

14

using high speed disc saws safely Comments and Instructions cont.

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®

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

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

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

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

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

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

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

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

Do not over speed the blade rpm.

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

Do not neglect tooth fastening inspection, maintenance and replacement.

Do not neglect to repair worn or damaged saw housings.

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

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

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

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

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

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

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

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

Do not select and operate heads that throw rearward.

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

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

15

using high speed disc saws safely

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®

Tigercat 720D Feller Buncher SECTION 3 - LUBRICATION & MAINTENANCE MARCH 2002

CONTENTS - SECTION 3 AIR CLEANER MAINTENANCE ................................................................... 3.14 AIR CONDITIONING SYSTEM, CHECKING ................................................ 3.18 BELT, ENGINE SERPENTINE, REPLACING .............................................. 3.23 CENTER JOINT LUBRICATION .......................................................................................... 3.19 MAINTENANCE ........................................................................................ 3.19 DRIVE SHAFT SPLINE LUBRICATION, MIDDLE AND REAR .................... 3.24 ENGINE SERPENTINE BELT, REPLACING ............................................... 3.23 FILTERS ENGINE AIR CLEANER ........................................................................... 3.14 FUEL FILTER/WATER SEPARATOR ...................................................... 3.10 FUEL TANK STRAINER ........................................................................... 3.11 HYDRAULIC OIL RETURN FILTERS ....................................................... 3.12 HYDROSTATIC CHARGE PUMP PRESSURE FILTERS ....................... 3.12 HYDRAULIC OILS .......................................................................................... 3.6 NEW MACHINE MAINTENANCE FIRST 50-100 HOUR INSPECTION AND SERVICE REPORT .................. 3.2 INITIAL PRE-DELIVERY INSPECTION ...................................................... 3.2 TIGHTENING POINTS ............................................................................... 3.2 OIL LOST FROM LEAKAGE .......................................................................... 3.2 PRESSURE SETTINGS ............................................................................... 3.28 PRESSURIZED WATER SYSTEMMAINTENANCE .................................... 3.16 REPLACING THE ENGINE SERPENTINE BELT ........................................ 3.23 SCHEDULED MAINTENANCE GENERAL ................................................................................................... 3.3 8 HOURS .................................................................................................... 3.4 125 HOURS ................................................................................................ 3.5 250 HOURS ................................................................................................ 3.5 500 HOURS ................................................................................................ 3.6 1000 HOURS .............................................................................................. 3.6 2000 HOURS .............................................................................................. 3.6 SEASONAL ................................................................................................ 3.6 STARTUP PROCEDURE AFTER MAINTENANCE ..................................... 3.20 TORQUE CHART ......................................................................................... 3.26 TORQUE CHART, GENERAL ...................................................................... 3.27 TRANSMISSION .......................................................................................... 3.19 CHECK OIL LEVEL .................................................................................. 3.19 WHEELS, INSTALLING ................................................................................. 3.2

Tigercat 720D Feller Buncher

Lubrication and Maintenance

PREVENTIVE MAINTENANCE SCHEDULE FOR 720D 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 First 50-100 hour inspection report:~

IMPORTANT! Wheels:

All hydraulic connections

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.

Hose clamps Center joint pin securing bolts Transmission securing bolts Engine mounting bolts

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

Pump drive gearbox securing bolts Axle mounting bolts

Hour meter ~ maintenance:

Wheel retaining bolts

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

Cab securing bolts Pin retainers

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

Any other loose nut, bolt or fitting

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

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

_______________________________________________________________________________________

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

*OIL LOST FROM LEAKAGE

_______________________________________________________________________________________ LEAKAGE RATE ONE DROP IN 10 SECONDS ONE DROP IN 5 SECONDS ONE DROP PER SECOND THREE DROP PER SECOND DROPS BREAK INTO STREAM

3.2

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

Tigercat 720D Feller Buncher

Lubrication and Maintenance

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

Clean around filler caps before checking or adding fluids.

Before welding on machine be sure master switch is disconnected.

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

Plug or cap immediately.

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

Clean up spills as soon as possible.

Clean away all branches, bark and chips.

Clean up all traces of oil to avoid fires.

Always use clean hydraulic oil and filters.

Drain dirty oil while still warm.

Always have a fire extinguisher at hand.

Do not exceed recommended fluid levels.

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

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

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)

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

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

______________________________________________

3.3

Tigercat 720D Feller Buncher

Lubrication and Maintenance

SCHEDULED MAINTENANCE EVERY 8 HOURS (EVERY SHIFT):~

Clean:~ Potentially damaging limbs or sticks from machine

Check engine oil level Drain fuel/water separator

Between air conditioner condensor and oil cooler/radiator

Check air intake precleaner, clean as required Check air cleaner unloader valve

Check:~ For leakage around hydraulic components and flexible hoses

Check engine air filter restriction indicator Check hydraulic oil level Check pump drive gearbox oil level with dipstick

For loose nuts, bolts and fittings

Check transmission oil level at dipstick

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

Condition and tension of accessort drive belt.

Lubricate axles ~ outer bearings ‡ 1 fitting, 4-places, lubricate until grease flows out past the outer seals. Do not use power greasers as it will damage the seals.

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

‡ Under normal conditions every 125 hours.

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

Conduct an overall visual inspection.

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

Lubricate mid drive shaft slip joint* 1-fitting, purge *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 Lubricate tilt and lift cylinder ends, 8-fittings, purge Lubricate lift boom and tilt linkage, 9 or 10 fittings, depending on felling head), purge

3.4

Tigercat 720D Feller Buncher

Lubrication and Maintenance

SCHEDULED MAINTENANCE EVERY 125 HOURS:~

Visually inspect for: Frayed electrical wiring and hydraulic hose

Perform 8 hour maintenance

Wear in any other components

And in addition:~ Lubricate rear axle pivot, 2-fittings, purge

Clean/replace: Air conditioner re-circulation filter Cab fresh air filter

• Lubricate rear drive shaft slip joint 1-fitting, purge Lubricate axles ~ outer bearings ‡ 1-fitting, 4-places, lubricate until grease flows out past the outer seals. Do not use power greasers as it will damage the seals.

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

______________________________________________

‡ Under normal conditions every 125 hours.

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

EVERY 250 HOURS:~

Check: Engine coolant level

Perform 125 hour maintenance

Perform 8 hour maintenance And in addition replace:~ Engine oil and change oil filter

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

Engine fuel filter

Fluid level in batteries unless maintenance free

Air intake primary element

Engine rpm.

Oil in pump drive gearbox

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

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

Hydraulic pump and motor securing bolts Check fuel tank filler screen Torque tightening points as per new machine maintenance

Continued on page 6

Proper operation of pressurized water system.

(Refer to PRESSURIZED WATER SYSTEM in SECTION 2 of the OPERATOR'S MANUAL and PRESSURIZED WATER SYSTEM MAINTENANCE in THIS SECTION) Visually check for damage to: Lift boom and tilt linkage Front and rear frame Center joint area Attachment Make repairs immediately

3.5

Tigercat 720D Feller Buncher

Lubrication and Maintenance

SCHEDULED MAINTENANCE Continued from page 5

EVERY 500 HOURS:~

EVERY 1000 HOURS:~

Perform 8 hour maintenance

Perform 8 hour maintenance

Perform 125 hour maintenance

Perform 125 hour maintenance

Perform 250 hour maintenance

Perform 250 hour maintenance

And in addition replace:~ Air intake safety element

Perform 500 hour maintenance

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

And in addition replace :~ Engine air cleaner unloader valve

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

Fuel intake strainer

Hyd. Oil return filter, trav./steer †

Strainer in accumulator charge valve

Hyd. Oil return filters, saw/boom †

Check:~ Motion between center joint lugs

Hyd. Oil return filter, pilot †

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

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

______________________________________________

EVERY 2000 HOURS:~

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

Perform 8 hour maintenance

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

Perform 125 hour maintenance Perform 250 hour maintenance Perform 500 hour maintenance

______________________________________________

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

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

3.6

Tigercat 720D 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 PRESSURIZED WATER SYSTEM in SECTION 2 of the OPERATOR'S MANUAL and PRESSURIZED WATER SYSTEM MAINTENANCE in THIS SECTION) ______________________________________________

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

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

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

Chevron

Tractor hydraulic fluid (summer)

Citgo

Tractor hydraulic fluid (33-310) (summer)

Imperial

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

Shell

Donax TD (summer) Donax TDL (winter)

Sun

Sunfleet th fluid (summer)

John Deere

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

3.7

Tigercat 720D Feller Buncher ATTACHMENT

4 FTG/8

Lubrication and Maintenance OUTER AXLE BEARINGS

22

4 FTG/8

26

1

16

4

7

8

23

6 5 14

12 13 15 20 STEER CYLINDERS

8 FTG/8

4 FTG/8

BOOM CYLINDER PINS

9 FTG/8

8 FTG/500

2 FTG/125

DOOR SCREEN HINGES

AXLE OSCILLATION

25

BOOM/LINK PINS

1

10 11

9

5 6 17

4 24 19 REAR DRIVE SHAFT

2 FTG/8

19

CENTER JOINT 3

2 FTG/8

21

23

18

1 FTG/125

MID DRIVE SHAFT & FRONT DRIVE PILLOW BLOCK BEARING

LEGEND *** 2 FTG/125

STEER MACHINE FULLY BEFORE GREASING MID DRIVE SHAFT SLIP YOKE. LUBRICATION POINT WITH A DESIGNATED NUMBER OF FITTINGS (2 FTG) AND HOURS BETWEEN SERVICING (125 ). JOINT TO BE PURGED.

†

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

LUB DIAG.PDF

3.8

CHK REP DRN D/R LUB

HOURS CHECK REPLACE DRAIN DRAIN AND REFILL LUBRICATE

Tigercat 720D Feller Buncher

Lubrication and Maintenance

Tigercat® Model 720D/724D SERVICE AND LUBRICATION POINTS REFER TO Tigercat OPERATOR'S MANUAL FOR FURTHER INFORMATION

COOLING SYSTEM

3

CENTER JOINT PIVOT

LUB

4

ENGINE OIL AND FILTER JOHN DEERE 6801 - 724D JOHN DEERE 6068 - 720B CUMMINS 'C' -724D CUMMINS 'B' -720D

CHK CHK CHK CHK

5

FUEL FILTER

6

FUEL WATER SEPARATOR

7 8

FUEL CAP SCREEN

CHK

30

QTY

USG

1000 $

500 $

250 $

125 $

8$

1

2000 $

SERVICE POINT NO.

ITEM

LITERS

CAPACITY

SERVICE EVERY

8

CHK

2

REP REP REP REP

1

DRN

1 CHK

INTAKE FUEL STRAINER

CHK

1

CLEAN OR REPLACE AS NECESSARY

1

DRAIN TANK, CLEAN OR REPLACE AS NECESSARY

9

AIR INTAKE PRECLEANER

10

AIR INTAKE PRIMARY FILTER ELEMENT

11

AIR INTAKE SAFETY FILTER ELEMENT

REP

1

12

HYDRAULIC OIL FILTER TRAVEL/STEER HYDRAULIC OIL FILTER BOOM/SAW HYDRAULIC OIL FILTER PILOT HYDRAULIC DRIVE CHARGE PRESSURE FILTER HYDRAULIC FAN DRIVE CHARGE PRESSURE FILTER PUMP DRIVE GEARBOX

REP V REP V REP V REP V REP V

1

CHK

D/R

4

1.1

18

TRANSMISSION

CHK

D/R

5.7

1.5

19

AXLES:

13 14 15 16

17

60/40 ANTIFREEZE (GM6035M SPEC.) CHECK MOTION BETWEEN CHASSIS LUGS SEE ENGINE MANUFACTURER'S MAINTENANCE MANUAL

26 6.9 19 5 19 5 14.2 3.75

REP

DESCRIPTION

CHK CHK REP

CHK

20

FRONT, 720D FRONT, 724D REAR, 720D/724D HYDRAULIC RESERVOIR

21

PARKING BRAKE

22

ATTACHMENT

LUB

23

PRESSURIZED WATER SYSTEM

CHK TEST

24 25

ACCUMULATOR CHARGE VALVE STRAINER A/C & HEATER FILTERS

26

OUTER AXLE BEARINGS

1

2

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

CHECK RESTRICTION INDICATOR ON FILTER HEAD AT FULL ENGINE RPM

1 1 1 CHECK LEVEL WITH DIPSTICK. FILL WITH MIL-L-2105C OR API-GL-5 BELOW -10Fº(-23ºC) USE 75W-90 UP TO 100ºF(38ºC) USE 80W-90 ABOVE 100ºF(38ºC) USE 85W-140

D/R 34 9.0 D/R 50 13.2 D/R 28 7.4 D/R 227 60

CHK

DRAIN AND REFILL COMPLET SYSTEM ANNUALLY OR AS REQUIRED SEASONALLY. MUST MEET JOHN DEERE TYPE J20C (HY-GARD) SUMMER OR TYPE J20D (HY-GARD) WINTER

CHK LUB

REFER TO SECTION 2 OF OPERATOR'S MANUAL. APPLY WD-40 TO BOTH SIDES OF SLIDE AND CLEVIS PIN ON HANDLE. SEE ATTACHMENT MANUFACTURER'S MANUAL CHECK SYSTEM PRESSURE, 60 PSI REFER TO SECTION 2 OPERATOR'S MANUAL.

D/R REP

CHK

1 CLEAN OR REPLACE AS NECESSARY

LUB* LUB*

ALWAYS WITH A HAND GREASE GUN. LUBRICATE UNTIL GREASE FLOWS OUT PAST THE OUTER SEAL. * UNDER NORMAL CONDITIONS EVERY 125 HOURS, UNDER ADVERSE CONDITIONS (MUD, WATER, SNOW) EVERY 8 HOURS

720D-724D LUBCHART.XLS

3.9

Tigercat 720D Feller Buncher FILTERS - REMOVE AND REPLACE IMPORTANT Failure to service and replace filters at the proper intervals specified in the manufacturer's manuals, could cause damage to the machine and result in the product warranty becoming NULL and VOID. Check Tigercat parts catalog for replacement filters.

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

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

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

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

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

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

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.

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.

FUEL LINE WATER SEPARATOR

718-D14

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

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

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

WATER SEPARATOR BOWL 216-2A

DRAIN TAP

3.10

Tigercat 720D Feller Buncher

Lubrication and Maintenance

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

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

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

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

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

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.

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

3.11

Tigercat 720D Feller Buncher

Lubrication and Maintenance

HYDRAULIC OIL RETURN FILTERS There are four full flow filters mounted on filter heads with built-in bypasses. Two are in the boom/saw return line, on a dual head. One is in the pilot return line and one is in the travel/steer return line. This travel/steer filter is colored blue indicating that it contains a water absorbing element. For service and replacement intervals see SERVICE AND LUBRICATION CHART in THIS SECTION.

6. The Tigercat spin-on filter element is supplied with two gaskets. The 720D uses the round ('O' ring style) section gasket for all four return filters. Discard the square section gasket.

TRAVEL RETURN FILTER WITH WATER ABSORBING ELEMENT (COLOR BLUE)

FILTER HEAD

GASKET

PILOT RETURN FILTER

FILTER ELEMENT FILTR_SEALS2

ROUND SECTION GASKET INSTALLATION

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

8. Apply clean oil to new round gasket surfaces.

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

BOOM/SAW RETURN FILTER, DUAL HEAD

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

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

HYDRAULIC OIL RETURN FILTERS 724D-D02 Changing the filters:

12. Start the engine and check for leaks.

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

HYDROSTATIC CHARGE PUMP PRESSURE FILTERS

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

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.

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

There are two full flow filters mounted on filter heads with built-in bypasses. One is in the output side of the hydrostatic drive charge pump and the other is in the output side of the hydrostatic fan drive pump. For service and replacement intervals see SERVICE AND LUBRICATION CHART in THIS SECTION. Changing the filters: 1. Park machine on level ground, install articulation lock bar, lower cutting head to ground, stop engine, pull parking brake ON and block wheels.

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

3.12

Tigercat 720D Feller Buncher

Lubrication and Maintenance IMPORTANT HYDRAULIC FILTER SERVICING GUIDELINES NEVER PRE-FILL ANY HYDRAULIC FILTERS ON 200, 700, 800 AND 1000 SERIES MACHINES NEVER PRE-FILL CHARGE PRESSURE FILTERS ON 600 SERIES SKIDDERS Tigercat generally does not recommend the pre-filling of spin-on filters due to the risk of damage to the hydraulic system caused by unfiltered oil. Unfiltered oil used to pre-fill filters enters directly into the hydraulic circuit.

Contaminants in unfiltered oil can cause significant and costly damage to hydraulic valves, pumps and motors. The cleanliness of hydraulic oil cannot be guaranteed unless it is always prefiltered before use.

FAN DRIVE CHARGE PRESSURE FILTER LOCATED BEHIND REMOVABLE PANEL IN FAN DRIVE AREA

724D-D03

CHARGE PRESSURE FILTER HYDRAULIC FAN DRIVE

ALWAYS PRE-FILL DUAL HEAD HYDRAULIC FILTERS ON 600 SERIES SKIDDERS Dual head hydraulic filters on 600 series skidders must always be pre-filled with clean oil as noted specifically in the manuals for each of these machines.

All 600 series hydraulic circuits direct oil from the dual head filters to the main and drive pump inlets. Air must not be allowed to enter the inlets of these pumps. Entry of air directly into pump inlets can cause significant and costly damage to pumps. In this particular case the risk of damage to pumps caused by entry of air into the circuit is considered to be greater than the risk of damage caused by unfiltered oil.

Prefiltering of any hydraulic oil used to pre-fill these filters is strongly recommended to eliminate the risk of damage caused by unfiltered oil.

TRAVEL/STEER CHARGE PRESSURE FILTER LOCATED ON HYDRAULIC TANK WALL

CHARGE PRESSURE FILTER HYDROSTATIC DRIVE 2. Wipe clean the area around the filter and head.

724D-D01

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.

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

6. The new filter has an attached gasket. 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.

3.13

Tigercat 720D Feller Buncher

Lubrication and Maintenance ENGINE AIR CLEANER

AIR CLEANER MAINTENANCE ENGINE AIR CLEANER

ENGINE AIR PRECLEANER

The air cleaner on this machine uses two filter elements; a primary element and a safety element accessible from the left side of engine.

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

FILTER RESTRICTION INDICATOR

UNLOADER VALVE

AIR CLEANER AND PRECLEANER ENGINE AIR PRECLEANER 724D-D13

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

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

197-11

FILTER RESTRICTION INDICATOR

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

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

UNLOADER VALVE

AIR CLEANER UNLOADER VALVE

AIR CLEANER UNLOADER VALVE

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

724D-D49

ONLY THE PURIFIED AIR GOES TO THE AIR FILTER

TURBO II PRECLEANER OPERATION

EXHAUST PORT AREA

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

This valve should be replaced every 1000 hours.

Remove the unloader valve from the tube of the air cleaner housing. Check and clean the valve. A good valve is soft and flexible. If plugged, be sure to check the filter elements as they may need replacing as well. Reattach the valve to the body.

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

218-21

PRECLEANER REAR VIEW 3.14

Tigercat 720D Feller Buncher

Lubrication and Maintenance

In addition to the LUBRICATION AND MAINTENANCE SCHEDULE outlined in THIS SECTION, the following instructions should also be noted:

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

The most common and damaging servicing problems are:

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

OVER SERVICING

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

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

PRIMARY OUTLET ELEMENT TUBE

SAFETY ELEMENT

ENGINE AIR PRECLEANER

724D-D13X

4. Always clean the inside of the outlet tube.

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

6. Inspect the new filter for damage.

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

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

AIR FILTER ELEMENTS

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

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

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

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

3.15

Tigercat 720D Feller Buncher

Lubrication and Maintenance

PRESSURIZED WATER SYSTEM MAINTENANCE

FILL & CHARGE PRESSURIZED WATER SYSTEM

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

HOSE

a. Completely discharge all water and compressed air from the tank via the hose end nozzle.

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

WATER SHUT OFF VALVE (SHOWN CLOSED)

9

196-16A

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

PRESSURIZED WATER SYSTEM CONTROL VALVE (UNDER SEAT)

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

AIR CHARGE VALVE

TANK FILL PLUG

PRESSURE GAUGE

196-9A

PRESSURIZED WATER SYSTEM

718-D19

c.

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

PRESSURIZED WATER SYSTEM

Close water shut off valve and fill tank with water. (Tank capacity is approx. 10.5 gals.)

NOTE: When temperatures below 32°F are anticipated, add a Nontoxic R. V. Antifreeze or other suitable antifreeze solution to the water.

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

d. Install fill plug in tank. e. Charge water tank with compressed air by connecting an air hose to air charge valve on side of seat near the pressure gauge.

Pressurize to 60 psi as indicated on pressure gauge.

3.16

Tigercat 720D Feller Buncher

Lubrication and Maintenance

PURGING PRESSURIZED WATER SYSTEM Purging should be carried out whenever the flow of water does not forcefully discharge from the end of the hose with the pressure gauge reading 60 psi. a. Follow procedures (a) and (b) from FILL & CHARGE PRESSURIZED WATER SYSTEM and continue with: b. Close the water shut off valve and add 2 gallons of clean water to the tank. Reinstall the fill plug and charge the system with 60 lbs. of compressed air through the charging valve. c.

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

d. If a forceful discharge was not achieved, repeat the purging procedure. If a second purging does not work, remove lines and check for an obstruction. e. After the purging operation, fill and charge the system as described in FILL & CHARGE PRESSURIZED WATER SYSTEM in THIS SECTION.

3.17

Tigercat 720D 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 with R134a refrigerant only. PAG (polyalkeylene glycol) oil should be present in the system and must be used on 'O' ring fittings during assembly.

IMPORTANT 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 SYSTEM TOTAL CAPACITIES PAG OIL R134a REFRIGERANT (polyalkylene glycol) 2.75 LBS.

CAUTION

7 OZ.

The compressor and charge valves are accessed from the right side engine compartment. The receiver drier is accessed from the compartment behind the right door, on the outside. The evaporator core is accessed on the right hand side of the machine just inside the cab door.

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

Always use personal protective equipment to guard against flying debris.

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

Check the condenser core for dirt and debris.

Clean as required. Refer to CLEANING A/C CONDENSOR, OIL COOLER AND RADIATOR in SECTION 2 of the OPERATOR'S MANUAL.

724D-D12

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

Check to see that compressor clutch will engage.

3.18

CHECK A/C CONDENSER CORE

Tigercat 720D Feller Buncher

Lubrication and Maintenance

CENTER JOINT

TRANSMISSION:

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

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

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

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

TRANSMISSION OIL LEVEL CHECK

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.

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

CHECK TRANSMISSION OIL LEVEL

720D-15

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.

DIP STICK TUBE

TRANSMISSION

FILL PLUG

REAR CHASSIS

CHECK FOR MOVEMENT IN THIS JOINT AREA

FRONT CHASSIS

CHECK TRANSMISSION OIL LEVEL CHECK OIL LEVEL 724D-D09

Check oil level at end of every 8 hour shift.

724D-D11

1000 HOUR CHECK

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

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

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

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

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

Do not overfill.

3.19

Tigercat 720D Feller Buncher START-UP PROCEDURE AFTER MAJOR MACHINE MAINTENANCE

Lubrication and Maintenance

With the hydraulic tank vacuum pump switch in the OFF position, remove the breather assembly from the hydraulic tank and pressurize the hydraulic tank through this opening using air or nitrogen. To ensure that the hydraulic tank is not contaminated use a clean rag as a filtering device.

As the tank becomes pressurized the hydraulic oil will move up the suction tube and over into the supply lines. Air will begin to exit at the air bleed plug.

When a constant stream of oil without any air exits the suction tube replace the air bleed plug. Do not remove pressure from the tank until the air bleed plug is fully tightened.

Remove the pressure from the tank and reinstall the air breather assembly.

This procedure should be followed:

After major service or a rebuild.

Whenever the machine has been drained of hydraulic oil.

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

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

2. Check coolant level in the radiator.

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

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

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

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

Fill the hydraulic tank if it has been drained.

Ensure all filters are in place.

Fill the drive and saw pumps with hydraulic oil through the case drain ports.

Remove the air bleed plug from the steel suction tube on the side of the oil reservoir.

BREATHER ASSEMBLY AIR BLEED PLUG

724D-D71

REMOVE THE AIR BLEED PLUG 3.20

Tigercat 720D Feller Buncher

Lubrication and Maintenance

MACHINE START-UP

CAUTION

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

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

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

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

1. Ensure the articulation lock bar is installed.

NOTE: It is necessary to press and hold the bulb test/engine start switch while turning the key switch to the START position to crank the engine. Refer to STARTING ENGINE in SECTION 2 of the OPERATOR'S MANUAL.

UNPLUG ENGINE START SOLENOID

4. Reconnect wires on injector pump solenoid.

Do not start engine.

INSTALL A 0-1000 PSI. GAUGE AT M3 PORT.

DRIVE PUMP

DISCONNECT ENGINE START SOLENOID (CUMMINS SHOWN)

720D-08

724D-D06

UNPLUG ENGINE START SOLENOID

720D-07

DISCONNECT ENGINE START SOLENOID (JOHN DEERE)

DRIVE PUMP 'M3' TEST PORT CONNECTION

5. Install a 0-1000 psi. gauge on drive pump to check charge pressure at M3 port. Watch gauge closely during startup.

2. Disconnect the engine start solenoid (prevents engine starting).

PILOT PRESSURE RELIEF VALVE 675 PSI.

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

PILOT PRESSURE REDUCING VALVE 550 PSI. 724D-D07

PILOT MANIFOLD

3.21

Tigercat 720D Feller Buncher

Lubrication and Maintenance

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.

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

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.

7. Remove pressure gauge from 'M3' port.

8. Install a 0 - 1000 psi. gauge on pilot manifold. ("P2" on right side, quick connect fitting) 9. Turn pilot pressure reducing valve (far left end, top of pilot manifold) all the way IN until it is lightly seated.

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

CRANK, LINK AND BOOM ARMS

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

CRANK ARM LINK ARM

12. Remove pressure gauge from the pilot manifold.

STEER CIRCUIT MAIN RELIEF 2500 PSI.

•

BOOM ARM

192-21A

INSTALL A 0-5000 PSI. GAUGE

724D-D04

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

STEER CIRCUIT MAIN RELIEF VALVE

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

With the parking brake released and at LOW IDLE, slowly operate the drive function forward and reverse a few times.

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

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

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

16. Remove pressure gauge from steer relief valve.

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

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.

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

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

3.22

Tigercat 720D Feller Buncher

Lubrication and Maintenance

REPLACING THE ENGINE SERPENTINE BELT

4. Carefully slide the black rubber section of the coupler towards the fan pump. This will provide enough clearance to replace the serpentine belt.

In order to replace the engine serpentine belt it is necessary to disassemble the fan drive pump coupling.

SLIDE BACK THE RUBBER SECTION OF THE COUPLER TO CREATE A SPACE

SHOWN WITH FAN AND HOSES REMOVED FOR CLARITY SERPENTINE BELT

COUPLER

724D-D56

SLIDE BACK THE BLACK RUBBER SECTION OF THE COUPLER

FAN DRIVE PUMP 724D-D54

PASS BELT THROUGH SPACE CREATED BETWEEN THE COUPLER

REMOVING SERPENTINE BELT

1. Park the machine on level ground. Parking brake ON, felling head resting on the ground and engine off.

2. Disconnect the fuel solenoid to prevent engine from starting when "jogging" the engine.

UN-PLUG CONNECTOR

724D-D57

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

FUEL SOLENOID 724D-D55 DISCONNECT FUEL SOLENOID 3. Remove the (8) socket head bolts that hold the pump drive coupler together. NOTE: the engine will have to be 'jogged' to access all of the bolts.

BLACK RUBBER COUPLER

6. Reassemble the pump drive coupler, using the original bolts. Use loctite 242 (temporary) or equivalent. Torque all bolts to 8-10 lbf-ft using an opposing torque pattern.

7. Reconnect the fuel solenoid.

REMOVE THE (8) SOCKET HEAD BOLTS

724D-D58

REMOVE\REPLACE SERPENTINE BELT

REMOVE BOLTS 3.23

Tigercat 720D Feller Buncher

Lubrication and Maintenance

MIDDLE AND REAR DRIVE SHAFT SPLINE LUBRICATION

MIDDLE SLIP SPLINE LUBRICATION

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

3. Apply grease to grease nipple until new, clean grease appears at slip spline seal, FIG. 'A'.

GREASE GUN

NEW GREASE APPEARS AT SLIP SPLINE SEAL

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

SLIP SPLINE LUBRICATION

FIG. 'A' MIDDLE DRIVE SHAFT SLIP SPLINE LUBRICATION If grease is going IN but not coming OUT at the spline location, check to see if grease is exiting from the relief fitting at yoke end of slip

1. Park machine on level ground, and steer fully to the right. Lower felling head to the ground.

Set parking brake ON.

724D-D52

2. Stop the engine and relieve trapped pressure from pilot system and brake accumulators by performing the following steps:

GREASE GUN

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

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

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

GREASE APPEARS AT RELIEF FITTING 724D-D51

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

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

FIG. 'B' MIDDLE DRIVE SHAFT YOKE END spline, FIG. 'B'. If so, cover the end of the relief fitting with a finger and continue to apply pressure to the grease nipple FIG. 'C'. If NEW GREASE APPEARS AT SLIP SPLINE SEAL

COVER RELIEF FITTING WITH FINGER

GREASE GUN

724D-D53

FIG. 'C' MIDDLE DRIVE SHAFT SLIP SPLINE LUBRICATION

grease pressure continues to exit from the relief fitting, remove the drive shaft and inspect for "hardened" grease build up, rust or other contaminants within the drive shaft. Repair or Replace drive shaft.

3.24

Tigercat 720D Feller Buncher

Lubrication and Maintenance

REAR SLIP SPLINE LUBRICATION 4. Apply grease to grease nipple until new, clean grease appears at the relief hole at yoke end of slip spline, FIG. 'D'.

GREASE GUN

GREASE APPEARS AT RELIEF HOLE 720C-01

FIG. 'D' REAR DRIVE SHAFT YOKE END 5. Cover relief hole with a finger and continue to apply pressure to grease nipple until new, clean grease appears at slip spline seal, FIG. 'E'.

GREASE GUN

NEW GREASE APPEARS AT SLIP SPLINE SEAL 720C-02

FIG. 'E' REAR DRIVE SHAFT SLIP SPLINE LUBRICATION

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

3.25

Tigercat 720D Feller Buncher

Lubrication and Maintenance

TORQUE CHART LOCATION

THREAD DIAMETER

Cylinders Pin bolts Piston nut, steer cyl.

Piston nut, boom/tilt cyl.

Gland, steer cyl.

Keeper plate bolts

TORQUE (LUBRICATED) lbf-ft Nm

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

282-310 930 1640 450 282-310

393-420 1282 2260 620 389-420

1/2" UNC 3/4" UNC

80-88 282-310

109-119 393-420

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

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

364 75 159-175

500 100 216-237

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

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

32 32

43 43

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

475-525 357

644-711 484

UNF UNF UNF UNF UNF

37 90 90 37 37

50 122 122 50 50

Axle mounting bolts Front Rear

7/8" UNC 3/4" UNC

364 226

500 310

Wheel bolts

7/8" UNF

500-550

679-745

Transmission housing to frame

7/8" UNC

364

500

Center joint bearing Bearing retaining bolts Pin retaining bolts

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

Rear drive shaft to trans.

Mid. drive shaft to trans.

Front drive shaft to Mid. drive shaft Front drive shaft to axle

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

720D-TORQUECHART.XLS

3.26

Tigercat 720D 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

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

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

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

ISSUE 3 800

3.27

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

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

Tigercat 720D Feller Buncher

Lubrication and Maintenance

PRESSURE SETTINGS

PRESSURE SETTINGS With hydraulic oil at operating temperature (120°F - 140°F) Loca tion

Pre ssure (PSI)

Engine RPM 2450 High Idle 900 Low Idle

Engine RPM Pilot Ma nifold Pressure Relief Valve Pressure Reducing Valve

675 550

1000 1000

Drive Pum p Charge Pressure Relief Valve Multi Function Valve: · P.O.R. Forward · P.O.R. Reverse · High Pressure Relief Forward · High Pressure Relief Reverse

350

1775

5050 5050 5500 Non-Adjustable 5500 Non-Adjustable

2450 2450

Drive Motor Drive Motor P.O.R. Loop flushing Pressure Relief

4050 360 Non-Adjustable

2450

3330 Non-Adjustable 205

1800 1800

Ste e r Va lve (Joystick Ste e ring Only Steer Valve Main Relief Steer Right Port Relief Steer Left Port Relief

2500 3200 3200

2450 1000 1000

Sa w Saw Valve Main Relief Saw Pump P.O.R.

3900 3650

1000 1000

Boom Va lve Mid Inlet Main Relief Tilt In Port Relief Tilt Out Port Relief Accumulator Clamp Open Port Relief Accumulator Clamp Close Port Relief Clamp Open Port Relief Clamp Close Port Relief Boom Lift Port Relief Boom Lower Port Relief

2600 2900 2900 3200 3200 1100 3200 2900 2200

2450 1000 1000 1000 1000 1000 1000 1000 1000

Fa n Pum p High Pressure Relief Forward and Reverse Charge Pressure Pressure Relief

ISSUE 1 1001

IMPORTANT NOTES: ~ Boom support must be used part# 4128A ~ W hen performing tilt out function, without a felling head installed, do not allow crank arms to hit boom

3.28

Tigercat 720D Feller Buncher SECTION 5 - PILOT SYSTEM JANUARY 2002

CONTENTS - SECTION 5 ACCUMULATOR CHARGE VALVE ...................................................................... 2 OPERATING DESCRIPTION ............................................................................ 2 REPLACE FILTER ............................................................................................ 8 SCHEMATIC ..................................................................................................... 2 ACCUMULATORS ................................................................................................ 3 BRAKE ACCUMULATOR .................................................................................. 3 CHARGING ...................................................................................................... 9 CHECK PRE-CHARGE PRESSURE ................................................................ 9 PILOT ACCUMULATOR .................................................................................... 3 TESTING DEVICE ............................................................................................ 9 COMPONENTS ................................................................................................... 2 HYDRAULIC OIL HEATING PROCEDURE ........................................................ 10 PILOT CIRCUIT DESCRIPTION .......................................................................... 6 PILOT CIRCUIT DIAGRAM .................................................................................. 7 PILOT MANIFOLD ............................................................................................... 4 ASSEMBLY DIAGRAM ...................................................................................... 5 OPERATING DESCRIPTION ............................................................................ 4 PILOT SHUT OFF ............................................................................................. 4 PILOT PRESSURE SETTINGS ......................................................................... 10 RELEASE PILOT SYSTEM PRESSURE ............................................................. 8

Tigercat 720D Feller Buncher PILOT SYSTEM COMPONENTS

Pilot System REPLACE CHARGE VALVE FILTER in THIS SECTION. No further adjustments or pressure settings are required.

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

PRESSURE PORT

STEERING PORT

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

DRAIN PORT ACCUMULATOR PORT

ACCUMULATOR CHARGE VALVE

ACCUMULATOR CHARGE VALVE

MO-03

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

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

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

This filter should be replaced every 1000 hours.

For filter replacement procedures, refer to

SYSTEM PRESSURE

FILTER LOCATION

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 5.2

Tigercat 720D Feller Buncher

Pilot System

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

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

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

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

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

BRAKE ACCUMULATOR

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

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

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

VALVE GUARD

VALVE CAP GAS VALVE

BODY

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

BLADDER

HYDRAULIC CONNECTION

ACCUMULATORS

ACCU-1

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

POPPET (Seats against oil port after oil evacuation)

ACCUMULATOR (BLADDER TYPE)

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

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

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

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

Tigercat 720D Feller Buncher

Pilot System Pilot oil then passes through the pilot relief valve.

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

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

Steer joystick Boom joystick Clamp(s) foot pedal Rear Axle differential lock Accumulator arm(s) close Accumulator arm(s) open Front Axle differential lock Saw Drive

To adjust the pressure reducing and the relief valves first loosen the jamnut, then to lower the pressure value screw OUT (counter-clockwise) the adjusting screw or, to raise the pressure value screw IN (clockwise) the adjusting screw. Tighten jamnut to lock this setting. For complete pressure setting instructions, refer to PILOT PRESSURE SETTINGS in THIS SECTION.

(P2) (P2) (P2) (C1) Solenoid valve (C3) Solenoid valve (C4) Solenoid valve (C5) Solenoid valve (C8) Solenoid valve

The solenoid operated pilot shut off control valve blocks pilot oil to the solenoid valves (C1 - C8) when either of the cab doors are open. This will prevent the machine from being operated accidentally or in the case of an operator leaving the machine in an emergency. When the cab doors have been closed, and the pilot reset switch has been turned on, the pilot shut off solenoid is energized and pilot oil is allowed to flow to the outlet ports (P2) and solenoid operated pilot valves (C1 - C8). All functions controlled through the pilot manifold will respond to the operator’s movement. Refer to PILOT SYSTEM SHUT OFF in SECTION 2 of the OPERATOR’S MANUAL.

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, C3, C4, C5, and C8. Plugs are installed in ports C2, C6 and C7 on standard machines. A “quick connect” type test port fitting is installed in port P2 for attaching a pressure gauge during hydraulic set-up procedures.

Oil is supplied to the pilot manifold (port P1) from the steer pump via the accumulator charge valve and the pilot accumulator. The pilot accumulator provides a constant pressure source for the pilot controls. For a more detailed description of accumulators and their operation, refer to ACCUMULATORS in THIS SECTION.

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

Oil entering the pilot manifold passes through the pilot pressure reducing valve. The pilot pressure reducing valve reduces and maintains the pilot pressure on the outlet side of the pilot manifold to a pre-set value.

PILOT PRESSURE RELIEF VALVE 675 PSI.

•

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

PILOT SHUT OFF SOLENOID VALVE

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

•

•

•• PILOT PRESSURE REDUCING VALVE 550 PSI. 724D-D07

PILOT MANIFOLD 5.4

Tigercat 720D Feller Buncher

Pilot System

SOLENOID OPERATED CONTROL VALVE(S)

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

REAR DIFFERENTIAL LOCK

IN FROM ACCUMULATOR CHARGE VALVE

AW030

SAW DRIVE FRONT DIFFERENTIAL LOCK ORIFICE

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

PILOT MANIFOLD ASSEMBLY 5.5

Tigercat 720D Feller Buncher

Pilot System

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

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

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

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

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

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

These three valves are manually operated pilot valves.

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

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

5.6

Tigercat 720D Feller Buncher

720D-04

Pilot System

PILOT CIRCUIT (WITH SAW) 5.7

Tigercat 720D Feller Buncher RELEASE PILOT SYSTEM PRESSURE

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

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

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

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

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

The following steps must be followed to release pressure:

2. Prior to beginning any service work on the pilot system or the braking system, pressure must first be released to prevent injury from oil spraying. Refer to RELEASE PILOT SYSTEM PRESSURE in THIS SECTION.

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

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

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

2B. Turn rear differential switch ON and hold front differential lock switch ON for 30 seconds.

While waiting, pump brake foot pedal at least 10 times.

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

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

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

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

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

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

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

STEERING PORT

PRESSURE PORT

DRAIN PORT

SPRING "O" RING

ACCUMULATOR PORT

PLUG WASHER

LOCKNUT

FILTER WASHER "O" RING SEAT POPPET AU001-3

ACCUMULATOR CHARGE VALVE 5.8

Tigercat 720D Feller Buncher CHARGING THE ACCUMULATORS

Pilot System CHECKING THE PRE-CHARGE PRESSURE

NOTE: A detailed instruction sheet is provided with the charging and testing device. The following is only a suggested guide.

•

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

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

•

Remove the valve guard and cap.

•

Screw the charging and testing device onto the gas valve.

HOSE*

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

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

PRESSURE GAUGE*

ADAPTER* ADAPTER* NITROGEN BOTTLE

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

ACCUMULATOR

ASSEMBLY PART NO. 90254 INCLUDES PARTS SHOWN *

ACCU-2

CHARGING AND TESTING DEVICE

•

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

•

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

•

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

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

Re-check pre-charge and adjust if necessary.

•

Disconnect hose from nitrogen bottle.

•

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

•

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

NEVER USE AN AUTOMOTIVE TYPE VALVE.

5.9

Tigercat 720D Feller Buncher PILOT PRESSURE SETTINGS The following procedure deals with setting up the PILOT circuit, i.e., the pilot manifold relief valve and the pressure reducing valve.

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

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

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

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

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

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

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

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

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

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

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

PRESSURE REDUCING VALVE

• RELIEF VALVE

The following steps must be followed to release pressure:

•

a) close both doors, turn ignition switch to ON position, do not start the engine, press pilot reset switch. b) activate all controls (switches, joysticks, left foot pedal etc.) and pump brake foot pedal at least 50 times or more. c) pressure may remain in the system after these numerous applications, use caution when loosening hydraulic connections.

AW119

5.10

PILOT MANIFOLD

Tigercat 720D Feller Buncher HYDRAULIC OIL HEATING PROCEDURE

Pilot System 5. Adjust throttle to FULL. 6.

There is a specific procedure for heating the hydraulic oil in the machine in preparation for hydraulic set-up procedures.

WARNING

1. Park the machine on level ground, parking brake ON, felling head down and engine off.

Install articulation lock bar, block wheels and stop engine.

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

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

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

•• MID INLET TEST PORT

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

MID INLET MAIN RELIEF

• 724D-D20

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

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

BOOM VALVE

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

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

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

5.11

Tigercat 720D Feller Buncher

Pilot System

5.12

Tigercat 720D Feller Buncher SECTION 6 - ELECTRICAL, GAUGES & ALARMS JANUARY 2002

CONTENTS - SECTION 6 ELECTRICAL SCHEMATIC DIAGRAM ....................................................................... 6.2, 6.3, 6.4 GAUGES AND ALARMS ............................................................................................................ 6.8 INSTRUMENT PANEL WIRING DIAGRAM ................................................................................ 6.5 RELAYS AND FUSES ................................................................................................................ 6.6 SENSOR, SENDER LOCATIONS .............................................................................................. 6.9 START AND FUEL SOLENOIDS ............................................................................................... 6.7 TESTING GAUGES ................................................................................................................... 6.8 WIRE COLOUR CODE CHART ................................................................................................. 6.6

Tigercat 720D Feller Buncher

Electrical, Gauges and Alarms

REFER TO COLOUR CODE CHART IN THIS SECTION

724D-14

ELECTRICAL SCHEMATIC DIAGRAM 14844B (REV 3, SHEET 1) 6.2

Tigercat 720D Feller Buncher

Electrical, Gauges and Alarms

REFER TO COLOUR CODE CHART IN THIS SECTION

724D-15

ELECTRICAL SCHEMATIC DIAGRAM 14844B (REV 3, SHEET 2) 6.3

Tigercat 720D Feller Buncher

Electrical, Gauges and Alarms

REFER TO COLOUR CODE CHART IN THIS SECTION

724D-16

ELECTRICAL SCHEMATIC DIAGRAM 14844B (REV 3, SHEET 3) 6.4

Tigercat 720D Feller Buncher

724D-17

Electrical, Gauges and Alarms

INSTRUMENT PANEL WIRING DIAGRAM 2734D (REV 2) 6.5

Tigercat 720D 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)

724D-D38

724D-D46

EMERGENCY ENGINE SHUTDOWN

FDC. O/RIDE

RELAY 7

RELAY 8

A/C OFF RELAY 10

HYD.OIL LEVEL LOW

START

RELAY 6

RELAY 3

FDC. O/RIDE

HORN TEST

BULB TEST

DRIVE LOCK

RELAY 9

DIODE 1

DIODE 4

RELAY 2

A/C-FDC SWITCH RELAY 11

RELAYS WITH FDC. CONTROL MODULE

HORN TEST

BULB TEST

PILOT LOCK

DIODE 2

DIODE 3

RELAY 1

DRIVE ENABLE RELAY 4 5A 1 GAUGES 15A 2 SAFETY 10A 3 CONTROLS 10A 4 FUEL 10A 5 RADIO

RELAY 5 20A 8 AUX. 10A 9 AUX FAN 30A 10 AC / HEATER 20A 11 LIGHTER 25A 12 F. LIGHTS

15A 25A 6 BACK HORN 13 R. LIGHTS 15A 15A 14 HORN / DOME 7 ETHER

FUSE, DIODE AND RELAY PANEL 6.6

SAW

Tigercat 720D Feller Buncher REMOTE START SOLENOID

Electrical, Gauges and Alarms

FUEL SOLENOID

•

••

125 AMP FUSE

••

724D-D47

REMOTE START SOLENOID

FUEL SOLENOID

•

•

•• 125 AMP FUSE

724D-24

START AND FUEL SOLENOIDS

6.7

Tigercat 720D Feller Buncher

Electrical, Gauges and Alarms

GAUGES AND ALARMS •

The 724D 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.

• GAUGE TERMINALS

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.

For replacement parts information, refer to GAUGES AND SENDERS in GROUP 600 of the PARTS CATALOG. 726B07

ITEM NO.

SENSOR FUNCTION

1 2 3 4 5 6 7 8 9 10 11 12 13

Saw circuit pressure gauge Engine hours Hydraulic oil temperature Hydraulic oil temperature, FDC. Hydraulic oil temperature Hydraulic oil level, low Engine oil pressure Engine oil pressure Engine coolant level Engine coolant temperature Engine coolant temperature Engine coolant temperature, FDC. Tachometer

14 15

Volts Engine air cleaner

16 17

Back-up alarm Safety alert horn

GAUGE/SENSOR RANGE LIGHT HORN

0-5000 psi 0-9999.9 100°F-240°F 130°F-160°F high/low 0-100 psi 100°F-280°F 190°F-204°F 0-3000 RPM

ON ON ON ON ON -

ON ON ON ON ON -

8v-18v Green-Red

-

-

-

-

ON ON

724D-SENSORS.XLS

6.8

•

Engine Oil Pressure

•

Hydraulic Oil Temperature

•

Engine Coolant Temperature OHMETER TEST READINGS

INFORMATION Refer to SECTION 17 - SAW DRIVE Total running hours Stop machine above 180°F Fan starts cooling fan turning at 130°F Red light/horn turns on at 205°F Red light indicates 10 gallons below FULL Stop engine below 10 PSI. Red light/horn turns on at 10 PSI Red light/horn turns on when coolant low in rad.

Cummins - 190°F-210°F operating range Red light/horn turns on at 215°F Fan starts cooling fan turning at 190°F Refer to THROTTLE CONTROL in SECTION 2 of the OPERATOR'S MANUAL Normal operation range 12-13.5 volts Green at high RPM - Filter OK Red at high RPM - Replace Filter Reverse Drive Pedal Switch on instrument panel

Tigercat 720D Feller Buncher SWITCH PILOT SHUT OFF LEFT CAB DOOR

Electrical, Gauges and Alarms 16 SWITCH -

BACK-UP ALARM

•

SWITCH PILOT SHUT OFF RIGHT CAB DOOR

•

• 5

•

6

LIGHTS AND 9 11 WARNING CONTROL PANEL HORN

8

• SWITCH, 17 HORN SAFETY HORN

FUEL SOLENOID

START SOLENOID PARKING BRAKE PROXIMITY SENSOR

• •

•

SENDER 9 ENGINE COOLANT LEVEL FOR WARNING LIGHT/HORN HORN, SAFETY 17

•

• SENDER - 12 ENGINE COOLANT TEMPERATURE FDC CONTROL

125 AMP FUSE

• SENDER ENGINE 10 COOLANT TEMPERATURE FOR GAUGE

SWITCH - ENGINE COOLANT TEMPERATURE FOR WARNING LIGHT/HORN

11

• •

VIEW 'A'

• SWITCH BATTERY DISCONNECT

• BACK-UP ALARM

•

•

•

•

16

• •

•

• •

•

VIEW 'A' 8 SWITCH - ENGINE OIL PRESSURE FOR WARNING LIGHT/HORN 7 BATTERIES SENDER ENGINE OIL 4 SENDER PRESSURE HYDRAULIC OIL FOR GAUGE TEMPERATURE FDC CONTROL

•

5 SWITCH - HYDRAULIC OIL 6 SWITCH - HYDRAULIC OIL LEVEL FOR WARNING LIGHT/HORN

720D-01

SENDER - HYDRAULIC OIL

3 TEMPERATURE FOR GAUGE

TEMPERATURE FOR WARNING LIGHT/HORN

SENSOR & SWITCH LOCATIONS 6.9

13 SENSOR TACHOMETER

2 SWITCH ENGINE HOURS

Tigercat 720D Feller Buncher

Electrical, Gauges and Alarms

6.10

Tigercat 720D Feller Buncher SECTION 7 - ENGINE JANUARY 2002

CONTENTS - SECTION 7 CIRCUIT DESCRIPTION CUMMINS ENGINE ..................................................... 7.2 COOLING SYSTEM COOLANT FLOW DIAGRAM ....................................... 7.6 COOLANT FLOW DURING OPERATION .................... 7.6 FILLING THE SYSTEM WITH COOLANT .................... 7.6 PARKING BRAKE ........................................................... 7.2 PRECLEANER OPERATION ................................................................ 7.7 SERVICE ..................................................................... 7.7 RELAYS, DIODES AND FUSES PANEL ......................... 7.3 START AND FUEL SOLENOIDS .................................... 7.2 START CIRCUIT DIAGRAMS - CUMMINS 'B' ENGINE AT REST ...................................................................... 7.4 RUN AND DRIVE ......................................................... 7.5 RUN, NO DRIVE .......................................................... 7.5 START ......................................................................... 7.4 STARTING SYSTEM DESCRIPTION ............................. 7.2 TACHOMETER SET-UP .................................................. 7.6

Tigercat 720D Feller Buncher

Engine

STARTING CIRCUIT

CIRCUIT DESCRIPTION - CUMMINS ENGINE

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

With the parking brake ON, the parking brake proximity switch is closed and the drive enable relay (4) is energized through wires 6 and 11.

For engine starting and stopping procedures refer to STARTING ENGINE and STOPPING ENGINE in SECTION 2 of the OPERATOR’S MANUAL.

KEY SWITCH

•

The engine starting circuit is controlled by a proximity switch located on the parking brake lever which prevents the engine from being started when the parking brake is OFF.

•

BULB TEST/ ENGINE SHUTDOWN OVERRIDE SWITCH

•

724D-D41B KEY AND BULB TEST SWITCHES When the key is turned to the START position, voltage is supplied to the start circuit through wire 6 to the contacts of drive enable relay (4) and wire 9 to the start relay (3).

PROXIMITY SWITCH

Voltage is supplied through wire 23 to the coil of the start relay (3), which closes and supplies voltage through wire 16 to the coils of the remote REMOTE START SOLENOID 337-19

FUEL SOLENOID

PARKING BRAKE "OFF" POSITION

•

••

125 AMP FUSE

••

337-20

724D-D47

PARKING BRAKE "ON" POSITION

start solenoid and the fuel solenoid. The start solenoid relay closes and supplies voltage through wire 12 to close the contacts of the start solenoid and supply battery power to the starter to turn the engine. The fuel solenoid contacts also close to supply power through wire 54 to the fuel control valve PULL IN coil during the start procedure.

The parking brake must be in the ON position to allow the engine to start. The engine is started by holding the bulb test/engine override switch in the ON position, turning the key to the START position and then releasing it to the RUN position after the engine starts. The the bulb test/engine override switch is also released.

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

Refer to START CIRCUIT DIAGRAMS in THIS SECTION.

START AND FUEL SOLENOIDS

During the start procedure the BULB TEST/ SHUTDOWN OVERRIDE SWITCH must be pressed and held to allow current to flow through wires 13, 13C and 76 and activate the HOLDING COIL in the fuel control valve. The switch can be 7.2

Tigercat 720D Feller Buncher

Engine To set machine in drive mode, place parking brake OFF to de-energize the drive enable relay (4) and allow voltage to flow to drive lock relay (2) along wire 66. Close both doors and press the pilot reset switch. This will energize the pilot shut off relay (1), de-energize the drive lock relay (2) and allow voltage to flow through wire 36 to energize the drive prevent valve solenoid and allow pilot oil to the drive pedals.

724D-D46

HYD.OIL LEVEL LOW

START

DRIVE ENABLE

RELAY 6 RELAY 3 RELAY 4 HORN TEST

BULB TEST

DIODE 1 DIODE 4

DRIVE LOCK RELAY 2

HORN TEST

BULB TEST

PILOT LOCK

DIODE 2

DIODE 3

RELAY 1

For schematic diagrams, showing various stages of the start circuit, refer to START CIRCUIT DIAGRAMS - CUMMINS 'B' ENGINE OPTION in THIS SECTION.

SAW RELAY 5

5A 20A 1 GAUGES 8 AUX. 10A 15A 9 AUX FAN 2 SAFETY 10A 30A 3 CONTROLS 10 AC / HEATER 20A 10A 4 FUEL 11 LIGHTER 10A 25A 5 RADIO 12 F. LIGHTS 25A 15A 6 BACK HORN 13 R. LIGHTS 15A 15A 7 ETHER 14 HORN / DOME

RELAYS, DIODES AND FUSES PANEL released after engine oil pressure rises above 10 psi. At this point the engine oil pressure switch contacts open and de-energize the emergency engine shutdown relay (7) allowing current to flow through wires13A and 13B to keep the HOLDING COIL activated.

When the parking brake is OFF, the drive enable relay (4) is de-energized, voltage is not available in wire 9 and therefore the engine cannot be started. This prevents accidental starting of the engine when the parking brake is OFF. It should be noted that with the engine running, the parking brake ON and the drive enable relay

197-5

CAB DOOR SWITCH

energized, voltage is not available in wire 66 to the drive lock relay (2). Because of this, driving the machine is still not possible until both cab doors are closed and the pilot reset switch is pressed.

7.3

Tigercat 720D Feller Buncher

Engine

START CIRCUIT DIAGRAMS - CUMMINS 'B' ENGINE OPTION START CIRCUIT - AT REST

724D-18

START CIRCUIT - START MASTER DISCONNECT - ON PARKING BRAKE - ON BULB TEST/OVERRIDE SWITCH - ON IGNITION KEY - START POSITION

724D-19

7.4

Tigercat 720D Feller Buncher

Engine

START CIRCUIT DIAGRAMS - CUMMINS 'B' ENGINE OPTION START CIRCUIT - RUN, NO DRIVE MASTER DISCONNECT - ON PARKING BRAKE - OFF PILOT RESET SW. - OFF BULB TEST/OVERRIDE SWITCH - OFF IGNITION KEY - RUN (IGNITION)

724D-20

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

720D-21

7.5

Tigercat 720D Feller Buncher ENGINE COOLING SYSTEM

Engine Additional coolant stored in the surge 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.

FILLING THE SYSTEM WITH COOLANT

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

A surge tank is located above the top tank of the radiator. A small 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 radiator top tank and are carried up through the vent tube where they collect in the surge tank and eventually discharge through the pressure cap.

The coolant is added through the filler neck in the surge 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 radiator top tank through the vent tube to the surge tank. As the radiator is filled, coolant flows through the water pump and engine oil cooler to fill the engine. Coolant will flow out the top radiator hose through the thermostat bypass and into the engine once the top tank of the radiator has filled. The engine vent discharges air directly from the engine to the surge tank.

When the engine has been run up to operating temperature and the thermostat has opened, any remaining air is purged through the 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 surge tank.

ENGINE VENT

SURGE TANK

THERMOSTAT (PARTIALLY OPEN) VENT TUBE AFTER COOLER TOP TANK

CYLINDER HEAD

SHUNT LINE RADIATOR CORE

BYPASS

ENGINE BLOCK

724D-22

ENGINE OIL COOLER

WATER PUMP

COOLANT FLOW DURING OPERATION 7.6

BOTTOM TANK

Tigercat 720D Feller Buncher

Engine

PRECLEANER - ENGINE AIR INTAKE

TACHOMETER SET-UP

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.

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

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

2. 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 HIGH VELOCITY, AIR POWERED ROTOR

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

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.

• •

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

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

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.

ONLY THE PURIFIED AIR GOES TO THE AIR FILTER

PRECLEANER OPERATION

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.

SERVICE Under normal conditions, the outer screen should be checked every 8 hours for obstructions such as leaves, needles and twigs. This is done by opening the left, rear, upper engine door.

The complete precleaner unit must be removed for inspection and cleaning whenever the air cleaner primary filter element is replaced. This is done by loosening the gear clamp behind the unit and pulling it loose. Check the blades for dirt build-up and clean them. Check the exhaust port area (narrow slots around outside of casing) for dirt and particle build-up. Clean the entire unit.

When installing the unit, ensure that the intake end with the screen is protruding into the hole in the engine door by about 1/4" when the door is closed. Tighten the gear clamp and check to see that the engine door closes properly.

NOTE: Tachometer must be calibrated accurately at high RPM (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.

7.7

Tigercat 720D Feller Buncher

Engine

7.8

Tigercat 720D Feller Buncher SECTION 8 - DRIVE CONTENTS - SECTION 8 AXLES ...........................................................................................................................................

AXLE LUBRICATION .................................................................................................................

BRAKE BLEEDING ....................................................................................................................

BRAKE LINING INSPECTION (REAR AXLE ONLY) ..................................................................

FILLING AXLES, ALTERNATIVE METHOD ...............................................................................

FILLING THE AXLES .................................................................................................................

REAR AXLE OSCILLATION SHIM .............................................................................................

SERVICE BRAKES (REAR AXLE ONLY) ..................................................................................

JANUARY 2002

8.22 8.24 8.23 8.23 8.25 8.24 8.26 8.23

CIRCUIT DIAGRAM, DRIVE ......................................................................................................... 8.13 CREEP VALVE .............................................................................................................................. 8.9 DRIVE MOTOR .............................................................................................................................

DRIVE MOTOR MINIMUM DISPLACEMENT ADJUSTMENT ......................................................

DRIVE PEDAL PILOT VALVE ........................................................................................................

DRIVE PREVENT VALVE ..............................................................................................................

DRIVE PUMP AND MOTOR PRESSURE SETTINGS AND ADJUST .........................................

DRIVE PUMP, SUNDSTRAND ......................................................................................................

DRIVE SHAFT, FRONT, INSTALLATION ......................................................................................

8.6 8.17 8.8 8.9 8.14 8.2 8.20

HYDROSTATIC DRIVE SYSTEM .................................................................................................. 8.2 MINIMUM DISPLACEMENT ADJUSTMENT, DRIVE MOTOR ...................................................... 8.17 PRESSURE SETTINGS AND ADJUSTMENTS ADJUSTING PUMP POR. VALVE .............................................................................................. 8.16 DRIVE MOTOR POR. VALVE ..................................................................................................... 8.16 MINIMUM DISPLACEMENT ADJUSTMENT, DRIVE MOTOR ................................................... 8.17 TEST DRIVE .................................................................................................................................

CREEP FUNCTION ...................................................................................................................

DIFFERENTIAL LOCK FUNCTIONS .........................................................................................

DRIVE MOTOR PRESSURE OVERRIDE (POR.) .....................................................................

ENGINE HORSEPOWER AUDIT ..............................................................................................

PARKING BRAKE ADJUSTMENT, CHECKING FOR ................................................................

SAW MOTOR BEGIN OF DISPLACEMENT REGULATION .......................................................

TOP SPEED CONTROL ............................................................................................................

TRANSMISSION ...........................................................................................................................

8.10 8.12 8.12 8.10 8.10 8.12 8.12 8.10 8.18

WHEEL INSTALLATION ................................................................................................................ 8.25

Tigercat 720D Feller Buncher

Drive

HIGH PRESSURE SUPPLY

BENT AXIS PISTON DRIVE MOTOR (LH) TO VEHICLE DRIVE

SWASHPLATE, AXIAL PISTON DRIVE PUMP

FROM DIESEL ENGINE

BENT AXIS PISTON DRIVE MOTOR (RH) TO VEHICLE DRIVE

LOW PRESSURE RETURN

724D-25

TYPICAL CONTINUOUS CLOSED LOOP HYDRAULIC CIRCUIT

HYDROSTATIC DRIVE SYSTEM The primary components of the 720D hydrostatic drive system are a hydraulic pump and two hydraulic motors connected together by 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 motors through the first connecting hose. The motors then reconvert the hydraulic power back into the mechanical power used to propel the machine. Low pressure hydraulic oil flow then returns from the motors to the pump through the other connecting hose thereby completing a continuous closed loop hydraulic circuit.

A hydraulic system is termed closed loop when the hydraulic oil returning from the motors 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.

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.

SAUER DRIVE PUMP The hydrostatic drive pump is mounted at the top center position of the pump drive gearbox. The input drive shaft of the pump is connected directly to the output of the gearbox. The gearbox is driven directly by the diesel engine through a flexible coupling.

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

The primary pump is a variable displacement, swashplate, in line axial piston type pump. The volume and direction of oil flow from the piston pump is determined by the angle of the tiltable swashplate. When the swashplate is stroked to a

NOTE: All earlier models of the Tigercat wheel feller bunchers 720, 720B, 720C, 724, 726, 726B have used hydrostatic drive pumps manufactured by Rexroth.

The 720D uses components manufactured by Sauer Danfoss. The use of Sauer components in some cases requires different setup procedures than were used with the Rexroth componentry.

8.2

Tigercat 720D Feller Buncher

Drive

maximum displacement angle, the piston pump will produce maximum flow in one direction in the closed loop. As the swashplate is de-stroked, the flow smoothly decreases until there is no flow at an angle of zero (0°). Continuing to angle the swashplate past this neutral position steplessly reverses the direction of flow from the piston pump.

When the tractive effort requirements of the vehicle are demanding, pressure on the high side of the closed loop can reach maximum. At this pressure the POR valve signals the swashplate control valve to de-stroke the swashplate, reducing piston pump flow and maintaining system pressure at the POR valve setting. Each POR valve incorporates an internal nonadjustable high pressure relief valve.

The two high pressure relief valves at ‘A’ and ‘B’ ports are intended only to act as pressure limiting safety devices in the event that the POR valve malfunctions or does not respond quickly enough to high pressure surges.

The hydrostatic piston pump is equipped with two pressure override (POR) valves at ports A and B to protect the closed loop hydrostatic drive components from excessive pressure. These POR valves are also referred to as multifunction valves.

••

'TEE' GAUGE TEST PORT (M3) • QUICK CONNECT RETURN TO TANK LINE

TO CHARGE PRESSURE FILTER

•• ••

•• 'A' POR VALVE ADJUSTING SCREW

'B' POR VALVE ADJUSTING SCREW

5 MM ALLEN KEY 1 1/16" WRENCH

5 MM ALLEN KEY 1 1/16" WRENCH

••

••

TO CREEP VALVE

••

•• • • ••

•

SUCTION FROM TANK

PRESSURE PORT 'A'

GAUGE TEST PORT 'M1' • PORT SIZE - 06 JIC 724D-D16

•

CHARGE PUMP

DRIVE PUMP - SAUER 8.3

•

PRESSURE PORT 'B'

CHARGE PRESS. RELIEF • 1 1/16" WRENCH • 1/2" SOC. WRENCH

GAUGE TEST PORT 'M2' • PORT SIZE - 06 JIC

Tigercat 720D Feller Buncher SYSTEM PRESSURE PORT 'B'

SLIDE BLOCK

Drive CONTROL CYLINDER

SERVO ARM

SWASHPLATE CONTROL VALVE FEED BACK SWASHPLATE CRADLE BEARING

DRIVE SHAFT

CHARGE PUMP

SYSTEM PRESSURE PORT 'A'

SWASHPLATE LEVELLER

SWASHPLATE

DRIVE PUMP (SAUER)

724D-01

and motors in the closed loop system. The charge pump also provides pilot oil to the drive foot controls and creep solenoid control valve.

LOCKNUT PRESSURE LIMITER CHECK HIGH PRESSURE POPPET VALVE VALVE RELIEF/CHECK POPPET POPPET

OPERATING DESCRIPTION

PRESSURE LIMITER BYPASS ADJUSTING SCREW ACTUATOR 724D-26

The drive foot control valve directs oil from the charge pump and sends a pressure signal to shift the spool in the swashplate control valve. This changes the position of the control cylinder, which is directly connected to the swashplate of the piston pump. The angle and direction that the swashplate moves determines the speed and direction of travel of the vehicle. The angle and direction that the swashplate moves is directly proportional to the position of the drive foot control. When neither of the drive foot controls are depressed, pilot oil is not supplied to the swashplate. The swashplate therefore remains in the neutral position and no oil is pumped by the piston pump.

PRESSURE LIMITER POPPET SEAT

CROSS SECTION OF POR (MULTI-FUNCTION VALVE)

The POR valve prevents continuous dumping of high pressure oil across the piston pump high pressure relief valves. This eliminates unnecessary heating of the oil and protects the pump and motors during rapid acceleration or deceleration and drive system stalls. For this reason the high pressure relief valves are automatically set to a higher pressure than the POR valve setting and are nonadjustable. The high pressure relief valves always dump oil from the high pressure to the low pressure side of the closed loop, keeping the hydraulic oil within the closed loop.

The drive foot control valve only functions when the parking brake lever is in the OFF position. This drive prevent circuit will not allow the machine to be driven with the parking brake ON. A proximity switch is attached to the parking brake lever.

When this lever is in the OFF position, the proximity switch contacts are open, de-energizing the drive enable relay and energizing the drive prevent valve. With the drive prevent valve

The secondary pump of the drive pump is a fixed displacement, internal gerotor type that provides charge oil (make-up oil) for the hydrostatic pump 8.4

Tigercat 720D Feller Buncher

Drive

CHARGE PRESSURE FILTER TO DRIVE FOOT CONTROL VALVE AND CREEP VALVE CHARGE PUMP FROM REVERSE DRIVE FOOT CONTROL FORWARD VALVE TO MOTORS

• GAUGE TEST PORT 'A'

•

SWASH PLATE CONTROL VALVE

• • • •

CHARGE PUMP RELIEF CHARGE PUMP

• GAUGE TEST PORT 'B'

• TO MOTORS

AP105-2

• HIGH PRESSURE RELIEFS 'A' AND 'B'

• • P.O.R VALVES 'A' AND 'B'

CONTROL CYLINDER

DRIVE PUMP SCHEMATIC (SAUER)

energized, drive foot control oil can be directed to either the forward or reverse side of the pump swashplate control valve as required. With the drive prevent valve de-energized, drive foot control oil is directed to tank, the drive pump displacement control valve does not move and the pump swashplate angle remains at zero (0°).

The charge pump continuously introduces oil from the hydraulic tank into the hydrostatic drive system via a charge pressure filter. The charge pressure relief valve maintains a constant pilot pressure for use by the swashplate control system. Excess charge pressure oil is relieved by the pump's charge pressure relief valve in conjunction with the loop flushing relief valve on the drive motors, this excess is dumped back into the case of the piston pump. Loop make up oil goes to the low pressure side of the closed loop to replenish losses due to internal leakage in the hydrostatic pump and motor. The flow of make-up oil acts as a cooling fluid for the piston pump and motors to ensure peak hydrostatic drive performance and long service life. The charge pressure filter ensures that only clean charge pump oil is introduced into the closed loop hydrostatic circuit and swashplate control system. Should the charge pressure filter become clogged with debris, charge pump flow is diverted to tank thus preventing the entry of unfiltered charge oil into the hydrostatic system.

For pressure setting procedures Refer to DRIVE PUMP AND MOTOR PRESSURE SETTINGS AND ADJUSTMENTS in THIS SECTION.

8.5

Tigercat 720D Feller Buncher

Drive

HYDROSTATIC DRIVE MOTOR Two motors are used to drive this machine. They are mounted to the input side of the transmission. A splined coupling connects each of the motor shafts to the two transmission input shafts.

Each motor is an axial piston, variable displacement, pressure compensated type. It forms a closed loop circuit with the pump.

High pressure oil from the pump enters the motor via port 'A' or port 'B', depending on the direction of travel. The oil is directed to the back of a set of pistons in the motor's rotary group. The pistons push against the back of the drive shaft at an angle causing it to rotate.

The angle of the pistons relative to the drive shaft determine the speed of the motor and the available torque. Reducing the angle provides increased speed with less torque. Increasing the angle will reduce the speed and provide more torque.

The angle of the pistons is variable and is changed by an internal control cylinder that receives high pressure oil via a combination of the motor's shuttle valve and the displacement control valve.

Except for when the CREEP switch is ON, displacement is regulated automatically between MINIMUM displacement and MAXIMUM displacement in response to system pressure.

The point at which the spool in the displacement control valve begins to move and stroke the piston to maximum displacement is known as "Begin of displacement regulation" (motor POR) See note**.

The motor's POR set point must be correctly set for

'M3' TEST PORT

the system to function properly. Refer to DRIVE PUMP AND MOTOR PRESSURE SETTINGS AND ADJUSTMENTS in THIS SECTION. When the CREEP switch is ON, charge pressure oil via the creep valve and motor port X1 is applied to the end of the displacement control valve spool to direct charge pressure oil to the end of the control cylinder and hold the motor at maximum displacement.

When CREEP is OFF charge pressure oil via port X1 is removed from the end of the displacement control valve spool allowing charge pressure oil to enter the 'back' of the control cylinder and destroke the motor. De-stroking the motor will only occur if system pressure is below the motor's POR set point.

A minimum displacement adjusting screw on the outside of the motor housing limits the stroke of the piston assembly thereby controlling the maximum speed of the motor.

WARNING: Improper adjustment of motor POR adjusting screw can result in motor failure due to overspeeding. When installing a new motor always ensure stroke limiting screw is set correctly. Refer to DRIVE PUMP AND MOTOR PRESSURE SETTINGS AND ADJUSTMENTS in THIS SECTION. NOTE** The term "begin of displacement regulation" can also be known as "begin of regulation" or "begin of stroke" or "begin of displacement" or "motor POR" In this manual it will be refered to as MOTOR POR. SERVO PISTON CYLINDER (MOTOR POR) ADJUSTING SCREW

LOOP FLUSHING RELIEF VALVE

•

'M1' TEST PORT

•

•

PISTONS

•

•

B

A

•

'M2' TEST PORT

DISPLACEMENT CONTROL

•

• •

•

•

AQ064-2

'A'

• 'M5' TEST PORT CREEP CONNECTION PORT (X1)

• VIEW 'A'

'M4' TEST PORT

DRIVE SHAFT

AQ064-1

'X' DIMENSION

DRIVE MOTOR (SAUER) 8.6

•

MINIMUM DISPLACEMENT ADJUSTING SCREW

• CREEP CONNECTION PORT (X1)

Tigercat 720D Feller Buncher SHUTTLE VALVE

LOOP FLUSHING RELIEF VALVE

LOOP FLUSHING VALVE

Drive CONTROL CYLINDER

MOTOR (POR) ADJUSTING SCREW

L1

••

M3

•

•

• M2

• B

M1 A

•

M4 M5

DRIVE MOTOR PORT LOCATIONS (SAUER)

AQ064-3

FROM CREEP SOLENOID VALVE

DISPLACEMENT CONTROL VALVE

724D-D25

DRIVE MOTOR SCHEMATIC (SAUER) A loop flushing valve is incorporated into the motor. This valve provides a regulated flow of oil from the low pressure side of the loop in the motor case. This action reduces the possibility of particle build up in the loop by providing a continuous change of oil, it also assists with cooling. This valve is factory set and requires no adjusting.

A loop flushing "orificed" relief valve is installed after the flushing valve, it is factory set to approx.

360 psi. and is non-adjustable. This relief valve serves to control the flow of oil exiting the flushing valve and eases the work load of the charge pressure relief valve on the pump.

8.7

X1

Tigercat 720D Feller Buncher

Drive

DRIVE PEDAL PILOT VALVE

At the same time the regulating spool (2) is moved through the regulating spring (3).

When the regulating stroke begins, there is a connection from port 'P' via hole (8) in the spool and work ports 1 and 2 in the base of the valve, to the swashplate control valve on the drive pump.

Pressure provided by the drive charge pump* at ports 1 and 2 is directly proportional to the position of the operator's foot on the foot pedal and the regulating spring characteristic.

1

2

P

T

DRIVE PILOT VALVE

AU004

This pilot valve is a manually operated directional valve and operates on the same principal as a direct operating pressure reducing valve.

Operated by foot, this valve directs oil pressure* provided by the drive charge pump, to the swashplate control valve on the drive pump to drive the machine either forward or reverse.

•

5

• •

4

•

2

3

•

1

•

• • •

•

8

'P' PORT

AU013-1

WORK PORTS 1, OR 2

SPOOL ARRANGEMENT

AU013-2

*NOTE:

OPERATING DESCRIPTION

Earlier Tigercat wheel feller bunchers used oil pressure supplied via the pilot manifold to perform this function. Sauer equipped 724D machines however use charge pressure oil from the hydrostatic drive pump to perform this function.

In the neutral position the foot pedal is held centered by return spring (4).

When the pedal (1) is operated, the plunger (5) is pushed against the return spring (4).

8.8

Tigercat 720D Feller Buncher

Drive

DRIVE PREVENT VALVE

CREEP VALVE

The drive prevent valve is located under the cab.

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

The creep valve is located in the rear chassis. This solenoid operated spool valve when energized directs drive charge pump pressure* to the end of the displacement control valve in the drive motors to direct system pressure to the end of the control cylinder and hold the motors at maximum displacement.

UNDERSIDE OF CAB

DRIVE PREVENT VALVE

•

UNDERSIDE OF CAB

CREEP VALVE

••

••

PILOT MANIFOLD

•

DRIVE PREVENT VALVE

724D-D24

SOLENOID AND CONNECTOR

SM-29

• P1

•

P2

SOLENOID AND CONNECTOR

90016-2

• •

SPOOL SECTION VALVE BLOCK

••

CREEP VALVE

724D-D23

•

3 1

•

PORT 1 SPOOL SECTION

PORT '3' CHARGE PRESSURE

PORT 2 V-04

•

PORT '2' TO DRIVE MOTOR PORT X1

DRIVE PREVENT VALVE

OPERATING DESCRIPTION When the solenoid valve is de-energized (parking brake ON) the spool cross connects the forward and reverse pilot lines causing drive charge pump oil to return to tank in the event the foot control is operated. This prevents the foot control from supplying pressure to the drive pump displacement controller.

• TANK PORT '1' AT022

When the solenoid valve is energized (parking brake OFF), the spool in the drive prevent valve shifts and blocks the cross connection between the forward and reverse pilot line. This allows the foot control (forward or reverse) to send drive charge pump pressure* to the drive pump displacement controller.

8.9

CREEP VALVE

2

Tigercat 720D Feller Buncher

Drive

TEST DRIVE

simultaneously. As foot brakes are released pressure in each drive motor should increase at M3 and decrease at M4 simultaneously.

This drive will verify the following: 1. Motor pressure override.

2. Engine horsepower audit.

3. Top speed control.

4. Creep function.

5. Front and rear differential lock functions.

6. Saw recovery time 7. Boom functions.

8. Parking brake operation.

Note: This test may have to be done a few times to get a proper reading.

ENGINE HORSEPOWER AUDIT:

REAR CHASSIS RH SIDE

1.

Install the articulation lock bar to prevent the machine from steering.

2.

Set the throttle control to FULL. Verify the tachometer reading at high idle: Cummins 6BTA5.9 engine: 2450-2500 RPM Deere 6068 TF engine: 2575-2625 RPM

3a. Leave the THROTTLE control set to FULL. 3b

Turn A/C switch OFF and set FAN speed to FULL ON (OVERRIDE).

3c. Operate the ACCUMULATOR CLOSE function and STEER the machine.

GAUGE CONNECTIONS Install 5,000 psi gauges on M3, M4 of the RH DRIVE MOTOR, M3, M4 LH DRIVE MOTOR and a 10,000 psi gauge on M5 DRIVE SYSTEM test connection.

4.

While doing the above, carefully drive the machine FORWARD and apply the foot brake to develop a reading of 4050 psi pressure at M5.

5.

Observe the engine rpm while doing the above. The engine should lug down into the following rpm range:

724D-D20

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

Cummins 6BTA5.9 Engine: 1975-2125 RPM Deere 6068 TF engine: 1670-2105 RPM

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.

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.

MOTOR PRESSURE OVERRIDE (POR) 1.

Turn creep switch OFF.

2.

Set throttle control to FULL.

3.

Drive the machine FORWARD at FULL SPEED. Apply the foot brake to slow the machine to approximately half speed but no slower.

4.

While doing the above, observe the pressure at 'M5'. The reading should be 4000-4100 psi (drive motor POR setting).

5.

Repeat Step 3, observe pressure at M3 and M4 on both drive motors as foot brakes are initially applied. Pressure in each drive motor should decrease at M3 and increase at M4 8.10

Note: This test may have to be done a few times to get a proper reading.

TOP SPEED CONTROL: 1.

Turn ON both front and rear differential locks.

Make sure that the creep switch is OFF. Set the throttle control to FULL.

2.

Drive the machine forward at top speed and adjust the throttle control so that the tachometer reads 2200 rpm at top speed.

3.

With the aid of an assistant drive the machine forward at top speed and record the time to complete 5 tire revolutions. This should take 7.8 seconds maximum.

If it takes longer than 7.8 seconds either the MOTOR minimum displacement, MOTOR POR or PUMP charge pressure may be incorrectly set.

Tigercat 720D Feller Buncher

Drive

8.11

Tigercat 720D Feller Buncher

Drive SAW MOTOR POR CONTROL PRESSURE, Tigercat SAWS:

CREEP FUNCTION: 1.

2.

Turn the creep switch ON. The light on the switch should illuminate.

1.

Set the throttle control so that the tachometer reads 2200 rpm. Drive the machine forward with foot pedal fully depressed, Maximum speed will be slow. At top speed record the time to complete 5 tire revolutions. This should take 29.1 seconds.

DIFFERENTIAL LOCK FUNCTIONS: 1.

Bring machine to a full stop, set throttle to IDLE, ensure both front and rear differential lock switches are turned OFF. Steer machine without depressing drive pedal.

CAUTION Ensure that all personnel are clear of the saw head 2.

Set throttle control FULL.

3.

Turn saw ON.

4.

For 5500, 5600 and 5700 wide kurf series saws: Observe saw pressure gauge visible through cab window, pressure should rise to 3600 psi. for about 15 seconds, drop to 3100 psi. for about 13 seconds and then drop to 1200 - 1800 psi. as saw reaches full rpm.

From FULL STOP to FULL rpm. should take 28 seconds.

5,

For 5000 narrow kurf series saws: saw pressure gauge should rise to 3600 psi. for about 8 seconds, drop to 3100 psi. for about 9 seconds and then drop to 1200 - 1800 psi. as saw reaches full rpm. From FULL STOP to FULL rpm. should take 17 seconds.

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

2.

Turn only the front differential lock switch ON. While steering the machine, both front wheels should slide instead of rotating.

Rear wheels should still rotate.

3.

Turn front differential lock switch OFF.

4.

Turn only the rear differential lock switch ON. While steering the machine, both rear wheels should slide instead of rotating.

Front wheels should still rotate.

Install saw guard and raise felling head 6 inches off ground.

NOTE: Refer to the Tigercat BUNCHING SAWS OPERATING AND SERVICE MANUAL for setup and servicing procedures.

CHECKING FOR PROPER PARKING BRAKE ADJUSTMENT The parking brake is properly adjusted when resistance is encountered half way through the brake lever’s travel.

Refer to SECTION 9 of THIS MANUAL for addjusting precedure and additional information on brakes.

8.12

Tigercat 720D Feller Buncher

724D-01

Drive

DRIVE CIRCUIT 8.13

Tigercat 720D Feller Buncher

Drive

DRIVE PUMP AND MOTOR PRESSURE SETTINGS AND ADJUSTMENTS

1.

Park machine on level ground, lower felling head to the ground.

TOOLS REQUIRED: 1 1/4" Wrench 1 1/16" Wrench 1/2" Soc. Wrench

2.

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

3.

Disconnect the drive prevent proximity sensor on the parking brake .

19 mm Wrench 10 mm Wrench 5 mm Allen key 3 mm Allen key

WARNING The drive prevent proximity sensor must be reconnected immediately after the adjustments are made

•

'TEE' GAUGE TEST PORT (M3) • QUICK CONNECT RETURN TO TANK LINE

TO CHARGE PRESSURE FILTER

•• ••

• 'A' POR VALVE ADJUSTING SCREW

'B' POR VALVE ADJUSTING SCREW

5 MM ALLEN KEY 1 1/16" WRENCH

5 MM ALLEN KEY 1 1/16" WRENCH

••

•

TO CREEP VALVE

•

• •• •• •

•

SUCTION FROM TANK

PRESSURE PORT 'A'

GAUGE TEST PORT 'M1' • PORT SIZE - 06 JIC 724D-D16

•

CHARGE PUMP

DRIVE PUMP - SAUER 8.14

••

PRESSURE PORT 'B'

CHARGE PRESS. RELIEF • 1 1/16" WRENCH • 1/2" SOC. WRENCH

GAUGE TEST PORT 'M2' • PORT SIZE - 06 JIC

Tigercat 720D Feller Buncher 4.

Set parking brake ON.

5.

Turn creep switch OFF.

Drive REAR CHASSIS RH SIDE

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

6.

Install articulation lock bar and shut off engine.

MOTOR GAUGE CONNECTIONS On the drive motors connect the following pressure gauges:

724D-D20

9.

ADJUST AUXILIARY BRAKE SET-UP CALIPER (ADJUSTING NUT) TO 50 LBF/FT.

• 0-5,000 psi to R.H. 'M3' and 'M4'.

• 0-5,000 psi to L.H. 'M3' and 'M4'.

• 0-10,000 psi to drive system press. 'M5' 10. Start the engine and set throttle to 1775 rpm.

••

11. Set pump charge pressure to 350 psi.

12. Disconnect the parking brake proximity sensor power wire from the sensor.

CAUTION 336-3AX

AUXILIARY BRAKE SET-UP CALIPER

7.

Adjust auxiliary brake set-up caliper to 50 lbf-ft. to lock the rotating brake disc. Refer to SECTION 9 of THIS MANUAL for ADJUSTING PROCEDURE.

8.

On the drive pump connect the following pressure gauges: • 0-500 psi to the test port 'M3 • 0-10,000 psi to ports 'M1' and 'M2'.

8.15

Avoid the risk of unintentionally driving the machine with this wire disconnected, the parking brake will be ON without the ability to release it. This will result in overheating of the brakes which could cause a fire in the machine.

Tigercat 720D Feller Buncher

Drive pressure value and counterclockwise to decrease. After adjustment hold adjusting screw in place and tighten locknut.

WARNING NOTE: Monitor oil temperature closely, if cardboard is being used to block the oil cooler it should be removed if the temperature starts to rise above normal. The operator should be instructed to press the pedal for 5 seconds and then to release the pedal for 5 seconds to prevent overheating of the valve by the hydraulic oil as it passes over the relief valve in the next procedures.

Adjustments are made during the time the pedal is pressed.

15. With the aid of an assistant hold down the brake pedal and while depressing the FORWARD drive pedal set the pump POR valve 'B' to 4000 - 4100 psi, gauge at 'M2'.

NOTE: This is a temporary setting until both motor POR valves have been set.

POR ADJUSTING SCREW • 3 MM ALLEN KEY

••

LOCKNUT • 10 MM WRENCH

LOOP FLUSHING RELIEF VALVE (NONE ADJUSTABLE)

13. Set engine throttle control to FULL.

•• •

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

14. With the aid of an assistant hold down the brake pedal and while depressing the REVERSE drive pedal set the pump POR valve 'A' to 4000 - 4100 psi, gauge at 'M1'.

724D-D28

DRIVE MOTOR POR VALVE 16. With the aid of an assistant hold down the brake pedal and while depressing the REVERSE drive pedal set the R.H. motor POR valve.

NOTE: This is a temporary setting until both motor POR valves have been set.

BYPASS ACTUATOR 5 MM ALLEN KEY ON ADJUSTING SCREW

19MM WRENCH ON LOCKNUT

Adjustment of the POR setting is accomplished by loosening the locknut on the adjusting screw with a 10 mm wrench.

Insert a 3 mm allen key into the adjusting screw. Clockwise rotation INCREASES the pressure at 'M3' and DECREASES the pressure at 'M4'. Counterclockwise rotation DECREASES the pressure at 'M3' and INCREASES at 'M4'. One full turn of the adjusting screw represents approximately 1000 psi. Adjustment is correct when pressures at BOTH 'M3' and 'M4' are equal.

• ••

724D-27

ADJUSTING PUMP POR VALVE

LOCKNUT PRESSURE LIMITER CHECK HIGH PRESSURE POPPET VALVE VALVE RELIEF/CHECK POPPET POPPET

17. With the aid of an assistant hold down the brake pedal and while depressing the REVERSE drive pedal set the L.H. motor POR valve. Refer to Step 13 for adjustment procedure.

PRESSURE LIMITER BYPASS ADJUSTING SCREW ACTUATOR 724D-26

PRESSURE LIMITER POPPET SEAT

CROSS SECTION OF POR (MULTI-FUNCTION VALVE)

Adjustment of this POR valve, also referred to as a muli-function valve, is accomplished by loosening the smallest locknut on the valve with the 19 mm wrench and inserting the 5 mm allen key into the pressure adjusting screw. Turn clockwise to increase 8.16

Tigercat 720D Feller Buncher

Drive

18. Verify correct setting for BOTH motors by holding down the brake pedal and depressing the REVERSE foot pedal; Pressure at 'M5' should read 4000 - 4100 psi and the reading at 'M3' and 'M4' should be equal.

(POR) ADJUSTING SCREW LOOP FLUSHING RELIEF VALVE

•

•

19. Verify FORWARD setting by holding down the brake pedal and depressing the FORWARD foot pedal; Pressure at 'M5' should read 4000 - 4100 psi and the reading at 'M3' and 'M4' should be equal.

20. Reset pump POR valves; With the aid of an assistant hold down the brake pedal and while depressing the REVERSE drive pedal set the pump POR valve 'A' to 5000 - 5100 psi, gauge at 'M1'. Refer to Step 11 for adjustment procedure.

'X' DIMENSION

• MINIMUM DISPLACEMENT ADJUSTING SCREW

DRIVE MOTOR (SAUER)

AQ064-1

21. With the aid of an assistant hold down the brake pedal and while depressing the FORWARD drive pedal set the pump POR valve 'B' to 5000 - 5100 psi, gauge at 'M2'.

Refer to Step 11 for adjustment procedure.

22. Ensure that the bypass actuator on the pump POR valve was not disturbed during the above procedure; Using a 1 1/16" wrench on the bypass actuator hex. and a 1 1/4" wrench on the valve body, rotate the bypass hex. until seated, torque to 30 lbf/ft.

"X"

DIM X

NOTE: The bypass actuator should have remained tight throughout the setup procedure, step 18 is only a check.

MIN. DISPLACEMENT "X" DIMENSION

DRIVE MOTOR MINIMUM DISPLACEMENT ADJUSTMENT NOTE: This adjustment need only be made after verifying that: (A) The motor POR and the charge pressure are both set correctly. See PREVIOUS PROCEDURE. (B) If the machine failed the DRIVE TEST, Refer to TOP SPEED CONTROL TEST in THIS SECTION.

23. Shut off the engine. Reconnect the parking brake proximity sensor.

24. Remove all pressure gauges and reinstall all plugs and caps.

Perform this procedure on BOTH MOTORS. 1.

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

2.

Check the 'X' dimension for the minimum displacement adjusting screw on the drive motor housing, the dimension from the top of the locknut to the end of the exposed screw should be 28mm.

NOTE: Repeat for the other motor.

8.17

Tigercat 720D Feller Buncher

Drive

TRANSMISSION The transmission drives both the front and rear axles of the machine. Power is supplied by two hydraulic motors mounted to the input side of the transmission. The output drive shafts transmit the power to both the front and rear axles.

The gears and bearings in the transmission are lubricated by splash lubrication inside the case.

The oil level in the transmission must always be kept up to the proper level indicated on the dipstick. Refer SECTION 3 of this manual for the recommended lubricant.

432-1

TRANSMISSION SHOWN ENGAGED

TRANSMISSION OIL LEVEL CHECK

•• TRANSMISSION SHOWN IN NEUTRAL The transmission disconnect lever is used to shift the transmission between the DRIVE and NEUTRAL positions, e.g. NEUTRAL for towing the machine.

432-3

724D-D09

CHECK TRANSMISSION OIL LEVEL DIPSTICK TUBE

TRANSMISSION

••

A short bar is placed through the hole in the lever and pulled upwards to put the transmission into neutral.

•

FILL PLUG

••

724D-D09

For more information on towing, Refer to TOWING INSTRUCTIONS in SECTION 2 of the OPERATOR'S MANUAL.

CHECK TRANSMISSION OIL LEVEL

8.18

Tigercat 720D Feller Buncher

Drive

8.19

Tigercat 720D Feller Buncher

Drive

FRONT DRIVE SHAFT

nut hand tight only. Be sure to align front and rear yoke in the same plane (see illustration).

Assembly and installation of a front drive shaft assembly.

1.

5.

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

NOTE: For this repair, front and rear chassis must be aligned.

2.

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

3.

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

4.

Remove the front drive shaft and pillow block bearing. Remove the grease line from the pillow block bearing, unbolt the bearing from the chassis and separate the front universal joint.

PILLOW BLOCK BEARING INSTALLATION ONTO FRONT DRIVE SHAFT:

Carefully clamp flat wing of yoke in a vice and torque the large 1 1/4"- 12 UNF retaining nut to 300-350 lbf-ft. DO NOT CLAMP TUBULAR PART OF DRIVE SHAFT IN VICE.

FRONT DRIVE SHAFT AND PILLOW BLOCK BEARING INSTALLATION IN TO MACHINE: 1.

Install front drive shaft and pillow block bearing first. Attach front universal, leave pillow block mounting bolts loose and attach grease line.

2.

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

IMPORTANT The mid shaft should not be installed backwards. The large diameter tube end of mid drive shaft must fasten to the universal joint at the transmission.

3.

Care must be taken to correctly align the front and rear chassis before tightening the pillow block bearing bolts. The front drive shaft must line up directly on center with the center steering articulation pin.

1.

Remove the yoke retaining nut and the yoke from the front drive shaft. DO NOT clamp the TUBULAR portion of the drive shaft in a vice during any of the assembly process.

2.

Slide the old pillow block bearing off of the drive shaft.

3.

Remove the set screw supplied with the bearing and discard.

4.

Remove the grease fitting supplied with the new bearing and discard. Care should be taken not to lose the locking pin inside the bearing housing.

5.

Make sure that the locking pin is properly positioned inside the bearing housing. Install the 90° grease fitting (from the grease line assembly) to ensure that the locking pin stays properly positioned within the dimple in the outer race of the bearing.

4.

Holding the front and rear chassis and the front drive shaft in alignment, tighten the two pillow block bearing bolts (3/4” UNC x 2”) with hardened washers under heads. Use LOCTITE 242 (blue - removable) and torque to 357 lbf-ft.

6.

Use anti-seize on the shaft. Install the new pillow block bearing with the long extension (set screw side) facing the splined end of the shaft (rear of machine). The bearing must slide freely on the shaft.

5.

Re-install the grease line to the pillow block bearing.

6.

Slowly add grease to the pillow block bearing using a hand grease gun until it starts to leak from the bearing. Be careful not to 'pop' the grease seal by adding grease too rapidly.

3.

4.

NOTE: To align the front and rear chassis, measure the distance between outer axle bearing grease fitting on the front and rear axles on one side of the machine. Then measure the same distance on the other side of the machine. Articulate the machine to get the same reading on both sides.

Install the set screw supplied with the new bearing lining it up with the slot in the shaft.

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

NOTE: DO NOT use a power greaser.

Use anti-seize on the shaft splines and install the yoke onto the drive shaft. Install retaining 8.20

Also refer to MIDDLE AND REAR DRIVE SHAFT SPLINE LUBRICATION in SECTION 3 of THIS MANUAL.

Tigercat 720D Feller Buncher

Drive FRONT AXLE

GREASE LINE

SET SCREW UNIVERSALS

PILLOW BLOCK BEARING YOKE RETAINING NUT

FRONT DRIVE SHAFT

SLIP SPLINE RELIEF FITTING TRANSMISSION REAR OUTPUT YOKE

SPLINES

YOKE

GREASE FITTING

FLAT WING OF YOKE SLIP SPLINE SEAL

MIDDLE DRIVE SHAFT

SLIP SPLINE

RELIEF FITTING

TRANSMISSION FRONT OUTPUT YOKE REAR AXLE

REAR DRIVE SHAFT

SLIP SPLINE SEAL

724D-01

DRIVE SHAFT INSTALLATION 8.21

GREASE FITTING

Tigercat 720D Feller Buncher AXLES

Drive

Power from the drive motors is transmitted to the front and rear axles via the transmission and the front and rear drive shafts.

The front axle assembly is bolted directly to the front chassis. The rear axle assembly is pivot mounted to the rear chassis, allowing oscillation of the axle.

DRAIN (TOP)

Apart from the mounting, both front and rear axle assemblies are configured in a similar way except that the rear axle has internal service brakes and the front axle has none.

DIFF. LOCK (BTM.)

Each axle assembly consists of an input yoke (1), a spiral bevel gear set (2), a differential gear set (3), hydraulic differential locks (4), inboard multiple wet disk brakes (5) (one each side in rear axle only), inboard planetary final drives (6) (one each side) and axle housings and shafts (7).

FRONT AXLE

26KSM

PIVOT LUBRICATION POINT

DIFF. LOCK (BTM.)

BRAKE

The final drive (6) is an inboard mounted planetary gear arrangement which further reduces speed and increases torque to the axles.

The input side receives drive power from the differential via a sun gear shaft. The output side (planetary carrier) is splined on to the axle.

DRAIN (TOP)

The lubricant in both axle assemblies is hydraulic oil. There are drain lines from each axle plumbed to the machine's hydraulic system. These drain lines take care of internal leakage originating from the differential locks, which use the same hydraulic oil as the machine's hydraulic system.

Refer also to AXLE LUBRICATION in THIS SECTION.

1

PIVOT LUBRICATION POINT

REAR AXLE 27KSM

AXLE HYDRAULIC CONNECTIONS

2 4

6

7

3

5 AXL-3

AXLE ASSEMBLY CROSS SECTION (REAR SHOWN) 8.22

Tigercat 720D Feller Buncher

Drive

DIFFERENTIAL AND DIFFERENTIAL LOCKS 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.

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.

BRAKE LINING INSPECTION (REAR AXLE ONLY) Inspection ports are provided in the differential case and are located on each side of the pivot boss when viewed from the opposite side of the input shaft.

Before inspecting the brakes the axle must be drained. Refer to DRAINING THE AXLES in THIS SECTION. •

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

ANNULAR PISTON

AXL-BRK

DUAL BRAKES (REAR AXLE)

PROCEDURE 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.

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. 8.23

1.

Place parking brake ON.

2.

Place a clear plastic tube over bleed screw with other end in a container.

3.

Start engine and set throttle at IDLE.

4.

Loosen bleed screw.

5.

With the aid of an assistant push and hold brake pedal down until brake bleeding is complete (no air bubbles in clear plastic tube).

6.

Tighten bleed screw when oil is free of air.

7.

Release brake foot pedal.

8.

Repeat above steps for the other bleed screw.

Tigercat 720D Feller Buncher

Drive

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

••

DRAINING THE AXLES Care should be taken when draining the hydraulic oil from the axles, not to also drain the oil from the hydraulic tank. To prevent oil from siphoning from the tank, first remove the hydraulic drain line from the top of the axle to allow air to vent into the axle when the bottom drain plug is removed and oil drains out. The line that is removed must be capped to prevent draining from the hydraulic tank.

•• CASE DRAIN PLUG

VENT PLUG

The time to schedule an oil change in the axles is when doing the seasonal oil change on the hydraulic oil tank, as they are part of the overall system and use the same oil.

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

635-P06

FILLING THE AXLES The axles must be filled by pumping oil in through the ports on the front of the differential housing on the front axle and the top left side of the differential housing on the rear axle.

Front Axle: Remove the two plugs on the top of the differential housing on the front axle, use one to fill the axle with and the other as a breather to allow air to vent out and also to allow oil to exit when the axle is full of oil.

REAR AXLE (LEFT SIDE OF MACHINE)

Rear Axle: Remove the two plugs* located on the front feft side of the rear axle. To access these plugs remove the hose guard bolted to the axle with three bolts. Tilt the left side of the axle down to facilitate better access. Use the case drain plug to fill the axle and the vent plug* to vent air *NOTE: If ONLY the axles were drained and not the entire hydraulic system, the port from which the drain line was removed will provide the vent and oil will exit from this port when the axle is full of oil. The drain line should remain capped until it is reinstalled.

REMOVE BOTH PLUGS, USE ONE FOR FILLING AND ONE FOR BREATHER

Care must be taken to ensure that both axles are completely full of oil and that all plugs, fittings and lines are tight.

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

• •• 720D-D04

FRONT AXLE

8.24

Tigercat 720D Feller Buncher

Drive

ALTERNATIVE METHOD OF FILLING AXLES

WHEEL INSTALLATION

The following alternative method of filling the axles with oil applies when only the axles have been drained of oil and not the hydraulic tank as well. If a major service has been done, the replacement of any major component or the complete machine has been drained of hydraulic oil, refer to START-UP PROCEDURE AFTER MAJOR MACHINE MAINTENANCE in SECTION 3 of THIS MANUAL.

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.

1.

Ensure the articulation lock pin is installed.

2.

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

3.

4.

•

2.17" MIN. FULL THREAD

6.

With cylinders fully retracted, top up the hydraulic oil reservoir with clean hydraulic oil.

.406" DRILL

7/8" - 14 UNF THREAD

20°

2.64" 3.41"

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

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

.79"

.06" X 45°

Turn both differential locks ON and run engine at IDLE for 30 minutes, this procedure will fill the axles with hydraulic oil and purge the air from them at the same time. (axles fill with controlled leakage from diff. locks). If wheels have been removed, operate forward and reverse pedals very slowly to fill axles with oil.

5.

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

TAPERED ASSEMBLY STUD FOR 7/8" BOLTS AXL-WHL

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

•

Thoroughly clean the wheel bolts, washers and the tapped holes in the axle flange.

When cleaning axle wheel flange, be sure to use the proper thread size tap, 7/8" - 14 UNF thread.

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

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

•

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

•

Install wheel bolts by hand to insure bolts are not cross threaded.

•

Remove assembly studs and install the remaining bolts.

•

Torque wheel bolts to the following values: 7/8"-14 UNF torque to 500-550 lbf/ft. lubricated.

WARNING If a power wrench is used, be sure that the wheel bolts are first hand-engaged to prevent stripping. Operate the wrench slowly to prevent damage to the threads.

8.25

Tigercat 720D Feller Buncher

Drive

REAR AXLE OSCILLATION SHIM CHECK AND ADJUSTMENT

3.

1.

The axle must be securely bolted to the chassis through the axle supports (front and back). Torque all axle mounting bolts. Refer to TORQUE CHART in SECTION 3 of THIS MANUAL.

2.

Temporarily disconnect the two grease hoses from the axle pivot to prevent grease pressure from affecting the set-up. Plug hose ends to avoid contamination.

DISCONNECT REAR PIVOT GREASE HOSE

Set a dial indicator against the input pinion shaft on the input end of the axle.

AXLE-05

4.

••

SET DIAL INDICATOR

Using a long pry bar between the chassis and the axle housing pry the axle backward.

It may be necessary to tip the axle from side to side to position the axle fully back for a proper reading.

AXLE-13

••

AXLE-06

USE LONG PRY BAR

AXLE-07

BETWEEN CHASSIS AND AXLE HOUSING

DISCONNECT FRONT PIVOT GREASE HOSE

724D-D31

8.26

Tigercat 720D Feller Buncher

Drive 10. Remove the outer cover plate. Carefully remove the centre pivot cover plate from the axle (6 bolts). Care must be taken to ensure that the thrust washer (a round perforated disk) and shims do not fall.

AXLE-10

TIP AXLE SIDE TO SIDE

AXLE-12

REMOVE CENTER PIVOT COVER

SHIMS

•• AXLE-11

TIP AXLE SIDE TO SIDE

5.

Zero the dial indicator.

6.

Using a long pry bar between the chassis and the axle housing pry the axle forward. It may be necessary to tip the axle from side to side to position the axle fully forward for a proper reading.

7.

Read the dial indicator. Axle movement should be .004” to .014”. Check the reading twice by repeating steps 4 through 7.

8.

If the reading is within the required range go to step 16.

9.

If the reading is not within the required range follow steps 10 through 15 to adjust.

THRUST WASHER

••

AXLE-16

THRUST WASHER AND SHIMS

11. If the measurement was below .004” ADD shims to get the required range. A 0.010” shim will change the reading by 0.010”. Stock shims are 0.010” and 0.040” thick.

12. If the measurement was above .014” REMOVE SHIMS to correct the reading. A 0.010” shim will change the reading by 0.010”.

Stock shims are 0.010” and 0.040” thick.

13. Replace the thrust washer.

14. Replace the center pivot front cover plate.

Make sure that the thrust washer and shims do not slide out of place and become damaged. Torque cover bolts (6) to 80 lbf-ft.

15. Repeat steps 4 to 7 to check the adjustment again. This reading should be checked twice.

16. Reinstall cover plate and grease hoses in the axle pivot, add grease until back pressure is felt.

8.27

Tigercat 720D Feller Buncher

Drive

8.28

Tigercat 720D Feller Buncher SECTION 9 - BRAKES AND DIFFERENTIAL LOCKS JANUARY 2002

CONTENTS - SECTION 9 AUXILIARY SET-UP CALIPER ............................................................................................ 9.4 BRAKES BRAKE ACCUMULATOR ................................................................................................. 9.2 CIRCUIT DESCRIPTION ................................................................................................. 9.2 CIRCUIT DIAGRAM ......................................................................................................... 9.3 FOOT CONTROL VALVE ................................................................................................. 9.2 DIFFERENTIAL LOCKS CIRCUIT DESCRIPTION ................................................................................................. 9.2 CIRCUIT DIAGRAM ......................................................................................................... 9.3 PARKING BRAKE ............................................................................................................... 9.4 AUXILIARY SET-UP CALIPER ......................................................................................... 9.4 BRAKE CALIPER ASSEMBLY ......................................................................................... 9.6 CALIPER FLOAT ADJUSTMENT ..................................................................................... 9.7 CHECKING FOR PROPER ADJUSTMENT .................................................................... 9.5 LINING REPLACEMENT ................................................................................................. 9.7 PROXIMITY SENSOR ..................................................................................................... 9.5

Tigercat 720D 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 750 psi to the brake foot control valve. The brake accumulator holds sufficient pressure for up to five (5) brake applications after the engine stalls or is shut down. Beyond this, the pressure drops substantially.

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

For further information about the brake accumulator refer to BRAKE ACCUMULATOR in SECTION 5 of THIS MANUAL.

••

CIRCUIT DESCRIPTIONS 213-20

BRAKE CIRCUIT

BRAKE PEDAL

BRAKE FOOT CONTROL VALVE This pilot valve is a manually operated directional valve and operates on the same principle as a pressure reducing valve.

As the pedal is depressed, pressure from the brake accumulator is sent to the brakes in the rear axle. A reaction piston in the valve senses this increase in brake pressure and relays feedback to the operator, i.e. as brake pressure increases the pedal effort increases proportionately.

For further information on brake accumulator and the accumulator charge valve operation, refer to SECTION 5 of THIS MANUAL. DIFFERENTIAL LOCKS CIRCUIT

A positive stop in the brake valve limits the brake pressure to a preset value. This preset value is determined by the requirements of the brakes in the rear axle, which in this case is 1000 psi. The brake pedal therefore regulates the pressure in the brake lines to 1000 psi maximum.

The differential locks in both the front and rear axles (optional on front axle with a steering wheel) are controlled by switches. The rear differential lock switch is located on the control panel in the cab. The front differential lock switch is located on the left hand (steering) joystick (on instrument panel with a steering wheel). The switches control two solenoid operated pilot valves in ports 'C1' (rear) and 'C5' (front) of the pilot manifold. Placing the front or rear differential lock switch in the ON position energizes the solenoid operated pilot valve which directs pilot oil to the differential lock clutch packs in the corresponding axle to lock the differentials.

Refer also to AXLES-DIFFERENTIAL LOCKS in SECTION 8 of THIS MANUAL.

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

T A P

MO-02 MO-01

A fixed displacement pump supplies oil to the accumulator charge valve. This valve directs oil to the brake accumulator through a check valve located between the pilot and brake accumulators. The oil from the brake accumulator side of the check valve is sent to the brake foot control valve to operate the rear axle brakes.

CROSS SECTION OF VALVE BODY

BRAKE FOOT CONTROL VALVE

9.2

Tigercat 720D Feller Buncher

724D-03

Brakes and Differential Locks

BRAKE AND DIFFERENTIAL LOCK CIRCUITS 9.3

Tigercat 720D Feller Buncher

Brakes and Differential Locks Pulling up on the parking brake lever engages the brake caliper on the brake disc. A proximity sensor mounted on the side of the parking brake

PARKING BRAKE The parking brake lever is located beside the operator’s seat. It is connected by a cable to a main disc brake caliper assembly mounted on the output side of the transmission.

BRAKE CABLE

••

ADJUST AUXILIARY BRAKE SET-UP CALIPER (ADJUSTING NUT) TO 50 LBF-FT.

• PROXIMITY SENSOR

PARKING BRAKE LEVER

AUXILIARY BRAKE SET-UP CALIPER 336-3AX A second AUXILIARY SET-UP CALIPER is used for hydraulic set-up procedures only and is not cable operated. When the auxiliary set-up caliper is not being used the adjusting nut should be loose with the jam nut tightened against it.

Friction between the brake caliper and the rotating disc can cause a fire. Refer to individual pressure setting procedures throughout this manual for further information on the use of the auxiliary brake set-up caliper.

••

•

METAL BAR

••

PARKING BRAKE PROXIMITY SENSOR

337-21

lever is also activated by a metal bar which moves to within 1/8" - 3/16" of the sensor. The proximity sensor activates the drive prevent circuit, to prevent the machine from being driven when the parking brake is ON. Pushing down on the lever releases the brake and de-activates the proximity sensor.

There are two ways to adjust the parking brake to compensate for wear. The first is to use the adjusting knob on the end of the parking brake lever. The second is to adjust the cable clevis at the caliper end of the brake cable.

9.4

Tigercat 720D Feller Buncher

Brakes and Differential Locks

CHECKING FOR PROPER PARKING BRAKE CABLE ADJUSTMENT

Proximity sensor: A proximity sensor attached to the parking brake has two main functions; When the brake is ON It (1) deactivates the drive prevent circuit to prevent the machine from being driven when the brake is ON and (2) enables the START circuit so that the engine can only be started with the parking brake ON. To drive the machine the parking brake must be OFF, both cab doors closed and the pilot reset button PRESSED.

The parking brake is properly adjusted when Resistance is encountered half way through the brake lever’s travel.

PARKING BRAKE CABLE ADJUSTMENTS Lever end: Turn the knob on the end of the brake lever to increase or decrease braking effect. (Set screw on side of adjusting knob will lock setting) Caliper end: Remove the cotter pin and clevis pin. Loosen the jamnut and thread the clevis on of off the cable to change the cable length. Tighten the jamnut. The jamnut should provide ¼" of preload to the spring.

Replace the clevis pin and cotter pin.

The parking brake proximity sensor should be adjusted so that the distance measured between the end of the sensor and the metal actuating bar of the brake lever is 1/8" with the parking brake in the OFF position. The sensor can be adjusted by loosening the two jamnuts and adjusting the location of the sensor.

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

After making adjustments verify that the sensor will activate the drive prevent circuit when the parking brake is in the OFF position.

Do not allow the sensor and the metal actuating bar make contact with each other.

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

BRAKE CABLE

WASHER (2)

SPRING

CLEVIS NUT (3)

•

COTTER PIN

•

CLEVIS PIN

•

•

•

•

• CALIPER ASSEMBLY

720C-PB5

PARKING BRAKE LEVER

ADJ. NUTS ADJUSTING KNOB

• • •

LOCKING SET SCREW

• •

• DISC

CLEVIS

•

•

•

•

••

TRANSMISSION

METAL BAR

LEVER PARKBRK5

•

PARKING BRAKE ASSEMBLY 9.5

PROXIMITY SENSOR 724D-26

Tigercat 720D Feller Buncher

Brakes and Differential Locks

REAR CALIPER TORQUE PLATE CARRIER AND LINING ASSEMBLY

CENTER ADJUSTING BOLT

CALIPER MOUNTING NUTS (2)

•

•

• • •

CALIPER MOUNTING BOLTS (2)

•

INNER SEAL (RUBBER)

•

BALL BEARINGS (3)

•

SLEEVES (2)

•

SPRING

•

RUBBER BOOT

•

THRUST WASHER

•

STAINLESS WASHER HARDENED WASHER

• •

•

•

• FRONT CALIPER TORQUE PLATE INNER CAM

•

•

SLEEVE SEAL (2)

RETAINER OUTER CAM

••

OUTER ADJUSTING NUT 720C-PB4

•

LEVER

INNER ADJUSTING NUT

BRAKE CALIPER ASSEMBLY

9.6

Tigercat 720D 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.

CALIPER FLOAT ADJUSTMENT 1. Using a feeler gauge, check that a gap (0.010” – 0.060”), referred to as caliper float, exists between the two mounting bolt sleeves and the caliper mounting bracket. There must be a 0.010” to 0.060” caliper float.

If adjustment is required; Loosen the two caliper mounting locknuts (behind the mounting bracket), adjust the two caliper mounting bolts and re-torque the two locking nuts to 100 to 120 lbf-ft, while holding the bolts from turning.

2. Collapse the lining retraction spring (sheet metal spring) and remove it from assembly.

3. Slide both torque plates away from the disc, move the carrier and lining assemblies out of the pockets and remove them from the brake assembly by sliding them sideways.

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

4. Apply a coating of "anti-seize" to the outside of the two sleeves and slide the torque plates back and forth along the sleeves to ensure that "anti-seize" gets into bores of caliper plates.

3. Rotate the caliper actuating lever to the 5:00 o’clock position (as viewed from the front of the machine looking towards the back). This lever has six possible positions. Lift the lever off of the pins on the back of the outer cam.

Hold the cam from moving and rotate the lever to the desired position and place it back on to the pins on the back of the cam.

5. Install new carrier and lining assemblies into each caliper torque plate.

6. Re-install the retraction spring into the assembly. The feet on the spring must be properly located into the holes in both lining carrier assemblies.

4. Tighten the inner adjustment nut until firm contact is made with the brake disc by the linings. Torque to 100 in-lbs (8 lbf-ft) and then back off 4 to 5 flats. Check that disc is free to rotate.

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

5. Tighten outer locknut against inner adjustment nut to hold this lining clearance adjustment in place (45 to 55 lbf-ft).

CALIPER MOUNTING NUTS

MOUNTING BRKT.

CALIPER "FLOAT"

MOUNTING SLEEVES

REAR TORQUE PLATE

FRONT TORQUE PLATE

CALIPER MOUNTING BOLTS LEVER INNER ADJ. NUT OUTER ADJ. NUT

PARKBRK3

BRAKE CALIPER

9.7

Tigercat 720D Feller Buncher

Brakes and Differential Locks

9.8

Tigercat 720D Feller Buncher SECTION 10 - OIL COOLER/RADIATOR AND CROSS-FLOW FAN JANUARY 2002

CONTENTS - SECTION 10 CHECK MAXIMUM FAN SPEED FORWARD AND REVERSE ........................................ 10.12 CIRCUIT DIAGRAM, CROSS-FLOW FAN ....................................................................... 10.11 CIRCUIT DIAGRAM, OIL COOLER ................................................................................... 10.5 COOLING SYSTEM, ENGINE .......................................... SEE SECTION 7 IN THIS MANUAL CROSS-FLOW FAN CIRCUIT DIAGRAM ........................................................................ 10.11 CROSS-FLOW FAN WITH ELECTRONIC FAN DRIVE CONTROL ................................... 10.6 ELECTRONIC FAN DRIVE CONTROL (FDC) CHECK FOR TEMPERATURE SENSOR FAILURE ...................................................... 10.15 CHECK MINIMUM FAN SPEED WITH A/C "ON" AND NO A/C D ................................. 10.15 CHECK VARIABLE FAN SPEED WHEN CONTROLLED BY ENGINE .......................... 10.16 CHECK VARIABLE FAN SPEED WHEN CONTROLLED BY HYDRAU ........................ 10.17 ENGINE COOLING SYSTEM ........................................... SEE SECTION 7 IN THIS MANUAL FAN COOLING CIRCUIT DESCRIPTION ........................................................................ 10.10 FAN DRIVE MOTOR .......................................................................................................... 10.9 FAN DRIVE MOTOR INSTALLATION ................................................................................. 10.9 FAN DRIVE PUMP ............................................................................................................. 10.6 FAN DRIVE PUMP PRESSURE, CHECK ........................................................................ 10.14 FAN PUMP FORWARD AND REVERSE MAX. DISPLACEMENT SET ........................... 10.12 FAN SPEED, MAX. FORWARD AND REVERSE ............................................................. 10.12 FDC CONTROL ................................................................................................................. 10.8 HYDRAULIC OIL TANK ...................................................................................................... 10.4 OIL COOLER ..................................................................................................................... 10.2 OIL COOLER AND RADIATOR INSTALLATION ................................................................ 10.3 OIL COOLER CIRCUIT DESCRIPTION ............................................................................ 10.2 OIL COOLER CIRCUIT DIAGRAM .................................................................................... 10.5 TROUBLE-SHOOTING GUIDE FDC. OPERATION ........................................................................................................ 10.18 OVERHEATING PROBLEMS ........................................................................................ 10.18 VACUUM PUMP, HYDRAULIC OIL TANK .......................................................................... 10.4

Tigercat 720D Feller Buncher

Oil Cooler/Radiator and Cross-flow Fan

OIL COOLER/RADIATOR

OIL COOLER

The hydraulic oil cooler and engine radiator are mounted side by side as an assembly. The assembly is mounted longitudinally in the rear RADIATOR

••

•

OIL COOLER

••

RADIATOR

•• FAN DRIVE PUMP

••

ENGINE, FRONT

••

FAN DRIVE MOTOR

A/C CONDENSER

LEFT SIDE OF MACHINE

•• ••

724D-D32

•

RADIATOR/OIL COOLER & A/C CONDENSOR RIGHT SIDE OF MACHINE

FAN DRIVE PUMP COUPLING 724D-D33

FAN DRIVE

The complete oil cooler/radiator/A-C condensor/ fan drive assembly is rubber isolation mounted to reduce the transmission of noise and to isolate the components from vibration.

Refer to SECTION 7 for information on the ENGINE COOLING SYSTEM.

724D-

HINGED A/C CONDENSOR

chassis to provide cross flow ventilation. The A/C condenser core is mounted in front of these two units and on hinges to facilitate cleaning. The cooling fan is mounted behind the oil cooler/ radiator assembly and draws air from the left side of the machine. The air passes through the oil cooler/radiator and A/C condensor core and exhausts on the right side of the machine.

The fan drive system is reversible to facilitate cleaning by blowing air in the opposite direction through the cooling assembly This cooling assembly must be checked daily for accumulation of debris.

For detailed cleaning procedures, refer to CLEANING A/C CONDENSER, OIL COOLER AND RADIATOR in SECTION 2 of the OPERATOR’S MANUAL. OIL COOLER CIRCUIT DESCRIPTION The oil cooler is situated down stream from the boom/saw control valve. The boom control valve receives hydraulic oil from both the boom section of the boom/steer gear pump and from the saw piston pump. The control spool sections of this valve are all "open center" type, therefore oil surplus to requirements is allowed to pass through the valve to the outlet section of the valve and then return to tank via the oil cooler.

Cooling of the oil occurs as air is drawn over the oil cooler cooling fins. Cooled oil then passes through the dual head return filter and into the hydraulic tank.

A check valve, installed in the line at the dual head filter, prevents the tank from being drained in the

10.2

Tigercat 720D Feller Buncher

Oil Cooler/Radiator and Cross-flow Fan SURGE TANK

•

OIL COOLER 'OUT' CONNECTION TO DOUBLE FILTER A/C CONDENSER

RADIATOR

OIL COOLER

•

•

•

• •

FAN SHROUD FAN FINGER GUARD

•

RADIATOR AND OIL COOLER MOUNTS

•

• • •

RADIATOR TOP TUBE

ENGINE CONNECTIONS

• FAN MOTOR FAN DRIVE SUPPORT

• • RADIATOR BOTTOM TUBE

724D-05

OIL COOLER AND RADIATOR INSTALLATION 10.3

NOTE: REGULARLY CHECK FOR DEBRIS ACCUMULATION BETWEEN RADIATOR/ OIL COOLER AND A/C CONDENSER

Tigercat 720D Feller Buncher

Oil Cooler/Radiator and Cross-flow Fan

event that the boom valve drain line (routed through the center joint area) is damaged.

With the KEY SWITCH turned OFF, turning the vacuum switch to the ON position energizes the vacuum pump and the tank vacuum valve solenoid

HYDRAULIC OIL TANK Under normal operating conditions the hydraulic oil tank could become pressurized due to the warming of the hydraulic oil and the influence of outside ambient temperatures.

CHECK VALVE 5 PSI.

HYDRAULIC TANK

BREATHER/ FILTER 10 PSI.

VACUUM PUMP

•• ••

A check valve preset to 5 psi will ensure that the pressure in the tank does not rise beyond that point.

••

•

•

VACUUM PUMP (EARLIER MACHINES) To prevent loss of hydraulic oil due to a broken line or when making repairs to a broken line, a vacuum pump is installed. When turned ON this pump will create a vacuum in the hydraulic tank, reducing the possibility of leakage while repairs are taking place.

RESERVOIR

SUCTION LINE FROM TANK TANK VACUUM VALVE 724D-D44

HYDRAULIC TANK VACUUM & PRESSURIZATION COMPONENTS

DOUBLE ELEMENT FILTERS

••

•

VIEW WITH TOP REAR ENGINE ENCLOSURE PANEL REMOVED

TRAVEL/ RETURN FILTER (COLOR BLUE)

PILOT RETURN FILTER

•

• •• CHARGE PRESSURE FILTER, DRIVE

DRIVE PUMP

••

HAND FILL PUMP

FUEL FILTER

•

•• ••

•

•

BOOM/STEER PUMP 724D-D34

PUMPS 10.4

SAW PUMP

Tigercat 720D Feller Buncher

Oil Cooler/Radiator and Cross-flow Fan

to open up the air space in the top of the hydraulic tank to the vacuum created by the vacuum pump. The pump may remain ON during the time the repairs are in progress.

Turning the vacuum switch OFF will stop the vacuum pump, shift the spool in the vacuum valve and open

724D-06

the tank to atmosphere via a 0.5 psi vent fitting.

HYDRAULIC OIL HAND FILL PUMP 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.

OIL COOLER CIRCUIT (WITH SAW ATTACHMENT) 10.5

Tigercat 720D Feller Buncher

Oil Cooler/Radiator and Cross-flow Fan

ENGINE, FRONT

•• • DRAIN FROM CHARGE PRESSURE FILTER

FAN DRIVE PUMP

SYSTEM PRESSURE PORT 'A'

DRAIN LINE TO PUMP PORT 'L2'

•• •

•

•

• •

•• SYSTEM PRESSURE PORT 'B'

CHARGE OIL FROM PRESSURE FILTER

FAN DRIVE MOTOR

FAN DRIVE PUMP COUPLING 724D-D35

RIGHT SIDE OF MACHINE

FAN DRIVE

CROSS-FLOW FAN WITH ELECTRONIC FAN DRIVE CONTROL (FDC) The cross-flow fan is driven by a dedicated closed loop hydraulic system consisting of a variable displacement drive pump and a fixed displacement fan drive motor. The cooling fan is mounted behind the oil cooler/radiator assembly and draws air from the left side of the machine. The air passes through the oil cooler/radiator and A/C condensor core and exhausts on the right side of the machine.

COUPLING TO ENGINE

'M2' RETURN TANK PORT

'M1' TEST PORT (FORWARD RELIEF) 'M2' TEST PORT (REVERSE RELIEF)

• •• REVERSE MAXIMUM DISPLACEMENT ADJUSTING SCREW

•

'A'

• 'B'

••

By reversing the direction of air flow (CLEAN or PURGE) dust and debris are forced out of the radiator, oil cooler, A/C condenser cores. The fan drive is controlled electronically by the FDC system.

724D-D37

FAN DRIVE PUMP

FAN DRIVE PUMP The fan drive pump is located at the front of the engine, just below the cooling system assembly.

The fan drive pump is accessible from the right front engine access panels. A splined adapter connects the input drive shaft of the pump directly to the engine.

For additional information regarding the operation of the cross flow fan refer to FAN CONTROL and CLEANING A/C CONDENSER AND OIL COOLER/RADIATOR in SECTION 2 of THE OPERATOR'S MANUAL.

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

10.6

Tigercat 720D Feller Buncher

Oil Cooler/Radiator and Cross-flow Fan

SWASHPLATE

DRIVE SHAFT

PISTON(S)

•

VALVE PLATE

••

•

•

CHARGE PUMP

FAN DRIVE PUMP

AP117-1

The fan drive pump is actually two separate hydraulic pumps contained in one common housing and driven by the same input drive shaft.

The primary pump is a variable displacement, swashplate axial piston pump. 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 (0°). Continuing to angle the swashplate past this neutral position steplessly reverses the direction of flow from the piston pump.

The fan drive pump is equipped with two high pressure relief valves. These relief valves are factory set and non-adjustable.

The pump is equipped with an electronic controller which receives signals from the electronic fan displacement control unit (FDC) to control the movement of the swashplate.

For additional information on the FDC control, refer to FDC CONTROL in THIS SECTION.

10.7

The secondary pump of the fan drive pump is the charge pump which is a fixed displacement internal gear pump which provides charge oil (make-up oil) for the fan drive pump and motor in the closed loop fan drive circuit. Charge flow also provides cooling for the circuit and pressure for the pump control system.

The fan drive charge pump is equipped with a charge pressure relief valve to maintain the charge pressure. The charge pressure relief valve is adjustable.

Refer to FAN DRIVE PUMP PRESSURE VERIFICATION AND ADJUSTMENT in THIS SECTION. For information regarding charge pressure filter replacement, refer to HYDROSTATIC CHARGE PUMP PRESSURE FILTERS in SECTION 3 of THIS MANUAL

Tigercat 720D Feller Buncher

Oil Cooler/Radiator and Cross-flow Fan SENSOR

EMERGENCY SHUTDOWN RELAY (7)

•

••

••

••

••

FDC OVERRIDE RELAY (8) FDC OVERRIDE RELAY (9)

A/C OFF RELAY (10)

•

A/C FDC SWITCH RELAY (11)

••

724D-D40

ENGINE COOLANT TEMPERATURE SENSOR When the engine coolant temperature reaches 191°F the sensor on the engine in conjunction with the FDC control will send a signal to the controller on the pump to move the swashplate and start to turn the fan very slowly. The fan speed is infinitely variable from zero up to a maximum of 2200 rpm fan speed @2200 rpm engine speed. As the temperature of the coolant increases so does the speed of the fan up to the maximum 2200 rpm fan speed @2200 rpm engine speed. At this point the engine coolant temperature will be 201°F, or higher.

FDC PROCESSING MODULE

724D-D38

FDC PROCESSING MODULE AND RELAYS FDC CONTROL

HYDRAULIC OIL TANK

This control consists of an electronic processing module (FDC), a three position FAN switch in the operator's cab CLEAN/AUTO/FULL ON* (PURGE/AUTO/OVERRIDE)*, and two temperature sensors, one to sense engine coolant temperature and the other to sense hydraulic oil temperature.

CLEAN (PURGE)

AUTO

• •• SENSOR

FULL ON (OVERRIDE)

•• •• • •• •

724D-D39

HYDROSTATIC DRIVE CHARGE PRESSURE FILTER

HYD. OIL TEMPERATURE SENSOR

The temperature sensor in the hydraulic tank operates in a similar manner to the engine coolant temperature sensor but independently and with a different temperature range of 131°F - 153°F. This sensor will turn the fan ON at 131°F. As the temperature of the hydraulic oil increases, the speed of the fan will also increase to a maximum 2200 rpm fan speed @2200 rpm engine speed, at this point the temperature of the hydraulic oil will be 153°F, of higher.

CROSS FLOW FAN SWITCH 724D-D41A

•

CROSS FLOW FAN SWITCH

When the switch is in the AUTO position, the fan will operate completely in an automatic mode. It will start, speed up, slow down or stop all based on the temperature of the engine coolant and/or the temperature of the hydraulic oil.

*NOTE: The fan switch on earlier machines was labelled PURGE/AUTO/OVERRIDE, on current machines it is labelled CLEAN/AUTO/FULL ON

10.8

Tigercat 720D Feller Buncher

Oil Cooler/Radiator and Cross-flow Fan FAN DRIVE MOTOR

CAUTION

The fan drive motor is a fixed displacement axial piston motor. The fan drive motor is driven by hydraulic flow and pressure from the fan drive pump and in turn directly drives the cross-flow fan.

Before placing the fan switch in the CLEAN (PURGE) position make sure that there are no personnel on the left side of the machine in the area where the fan will expel debris When the switch is in the AUTO position and the fan is stopped due to low engine coolant or hydraulic oil temperatures, turning ON the A/C will immediately turn the cooling fan to run at 1200 rpm. This is to ensure that sufficient air flow is available for the cab A/C even while the machine is still warming up.

ASSEMBLY NOTE: Before re-installing a fan drive motor, pack spline area of fan hub and motor shaft with multi-purpose lithium grease.

See Fig. 630B-10.

When the switch is in the FULL ON (OVERRIDE) position, the FDC system is overridden and the fan will run at FULL speed for cooling regardless of coolant or oil temperatures.

When the switch is in the CLEAN (PURGE) position, the FDC system will signal the controller on the pump to move the pump swashplate in the opposite direction, reversing the flow of oil in the hydrostatic closed loop and turn the fan in reverse.

The FDC control will also turn the air conditioning system OFF for as long as the fan switch is in the CLEAN (PURGE) position. The amount of time that the switch is held in the CLEAN (PURGE) position need not be more than 20 - 30 seconds.

FAN DRIVE MOTOR

324-10

FILL HATCHED AREA WITH MULTI-PURPOSE LITHIUM GREASE AS SHOWN PRIOR TO INSTALLING MOTOR DO NOT FILL THIS AREA WITH GREASE

•• •

•

•

• •

•

• •

•

MOTOR

BOLT

WASHER

RETAINING RING

FAN SHAFT

• BEARINGS

FAN SUPPORT 630B-10

FAN DRIVE MOTOR INSTALLATION

10.9

FAN

o

o

At

r.

Tigercat 720D Feller Buncher

Oil Cooler/Radiator and Cross-flow Fan

FAN COOLING CIRCUIT DESCRIPTION

With the switch in the FULL ON (OVERRIDE) position, the FDC system is overridden and the fan will run at FULL speed for cooling regardless of coolant or oil temperatures.

The fan "cooling" circuit is a closed loop hydraulic system consisting of a variable displacement pump, a fixed displacement motor and a pressure filter.

The fan drive pump includes an integral charge pump which provides charge oil (make-up oil) for closed loop system. Charge flow also provides cooling for the circuit and pressure for the pump control system.

Charge oil is filtered prior to entering the loop by the charge pressure filter. The accumulation of excess oil in the pump and motor cases, caused by controlled internal leakage is return to the hydraulic tank via the pump tank port 'L2'.

The fan drive pump is equipped with an electronic controller which receives signals from the electronic fan control module (FDC) to control the operation of the pump.

With the fan switch in the AUTO position, current flows through RELAY '8' to the FDC control module BATTERY (+) terminal to power the FDC module. In this mode the FDC module has full control over the operation of the cooling fan. The fan will start, speed up, slow down or stop all based on the temperature of the engine coolant and/or the temperature of the hydraulic oil.

In addition if the cab air conditioning system is turned ON before the engine coolant or hydraulic oil has reached operating temperature, current will flow to energize RELAY (11) and connect the (+) and (-) A/C terminals on the FDC module. This will run the cooling fan at half speed.

When the temperature of the engine coolant reaches 191°F the sensor on the engine will send a signal to the FDC module. The FDC module will then send current to the FORWARD coil in the pump controller to move the pump swashplate and start to turn the fan very slowly. As the temperature increases so does the speed of the fan up to a maximum of 2200 rpm fan speed @2200 rpm engine speed. at this point the engine coolant temperature will be 201°F, or higher.

Hydraulic oil temperature is also monitored in the same way and will engage the fan independently of the engine cooling sensor if the hydraulic oil temperature reaches 131°F. first. This sensor will turn the fan ON at 131°F, as the temperature of the hydraulic oil increases, the speed of the fan will also increase to a maximum of 2200 rpm fan speed @2200 rpm engine speed, at this point the temperature of the hydraulic oil will be 153°F, or higher.

10.10

Current flows through the fan switch to energize the coil of RELAY (8) this will disconnect the FDC (battery +) terminal and shut down the FDC module. Current will flow via a 75 ohm resistor to the FORWARD coil in the pump controller to move the pump swashplate and start to turn the fan forward at FULL speed, 2200 rpm fan speed @2200 rpm engine speed. Current also flows to energize the coil of RELAY (9). This will connect the 'A' side of the pump controller FORWARD coil to ground and at the same time disconnect the pump controller FORWARD coil from the FDC FWD "-" terminal.

When the switch is in the CLEAN (PURGE) position, current flows through terminals 30 and 87A of the FDC RELAY (8) to the BATTERY (+) to power the FDC module. Current also flows through the fan switch via a 47 ohm resistor to the REVERSE coil in the pump controller to move the pump swashplate in the opposite direction and run the fan in reverse and at FULL speed. Current also flows to energize the coil of RELAY (10) and remove current from the A/C BINARY switch to turn off the air conditioning while the fan is running in REVERSE.

Tigercat 720D Feller Buncher

724D-07

Oil Cooler/Radiator and Cross-flow Fan

CROSS-FLOW FAN CIRCUIT 10.11

Tigercat 720D Feller Buncher

Oil Cooler/Radiator and Cross-flow Fan

CHECK MAXIMUM FAN SPEED FORWARD AND REVERSE

SENSOR

PUMP FORWARD AND REVERSE MAXIMUM DISPLACEMENT SETTINGS

••

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

1.

Park the machine on level ground. Parking brake ON, felling head on ground and engine OFF.

2.

Check that the forward displacement limiter adjusting screw (bottom) is set to 0.435" and the reverse displacement limiter adjusting screw (top) is set to 0.370", (dimension 'X').

724D-D40

ENGINE COOLANT TEMPERATURE SENSOR HYDRAULIC OIL TANK

•

"X"

•• • SENSOR

DIM X

DISPLACEMENT LIMITER ADJUSTING SCREW "X" DIMENSION

COUPLING TO ENGINE

'M2' RETURN TANK PORT

'M1' TEST PORT (FORWARD RELIEF) 724D-D39

'M2' TEST PORT (REVERSE RELIEF)

• REVERSE MAXIMUM DISPLACEMENT ADJUSTING SCREW 5/32' ALLEN KEY 1/2" WRENCH

•

•

3.

Place a piece of reflecting tape on the fan hub.

4.

Start the engine. Leave the parking brake ON.

••

5.

Adjust the throttle control until the engine is running at 2200 rpm.

FAN DRIVE PUMP

CHARGE PRESSURE RELIEF ADJUSTING SCREW

'M3' TEST PORT (CHARGE PRESSURE) REMOTE MOUNTED

SHOWN WITH HOSES REMOVED FOR CLARITY 346-1

•

••

HYD. OIL TEMPERATURE SENSOR

If adjustment is required:

•• 724D-D37

HYDROSTATIC DRIVE CHARGE PRESSURE FILTER

FORWARD MAXIMUM DISPLACEMENT ADJUSTING SCREW 5/32' ALLEN KEY 1/2" WRENCH

••

FAN DRIVE PUMP - REAR VIEW 10.12

Tigercat 720D Feller Buncher

Oil Cooler/Radiator and Cross-flow Fan 8.

If adjustment is required due to incorrect readings: a. Stop engine. The engine should not be running when adjustments are being made to the fan drive pump. b. Adjust the forward maximum displacement adjusting screw; Loosen jamnut and turn screw counterclockwise to increase speed and clockwise to decrease fan speed. Set to 2100-2200 rpm.

MANUAL SHIFT LEVER ON PUMP CONTROLLER SHOWN IN FULL FORWARD POSITION 724D-D43 6. Using the manual shift lever on the pump controller, shift the pump to full forward (UP) and measure the fan speed with the electronic photo tachometer, it should be 2200 rpm.

NOTE: Always start with adjusting screw turned in to less than 'X' dimension and then start to unscrew in one 1/2 turn increments. One full turn of the adjusting screw will raise/lower the fan speed by 315 rpm. c. Adjust the reverse maximum displacement adjusting screw; Loosen jamnut and turn screw counterclockwise to increase speed and clockwise to decrease fan speed. Set to 1700-1800 rpm. See NOTE in (b). d. Tighten jamnut (s) and re-check the forward and reverse fan speed as in steps 4 - 8 above. e. Continue with step 8 until correct forward and reverse fan speeds are obtained.

724D-D42

7.

MANUAL SHIFT LEVER ON PUMP CONTROLLER SHOWN IN FULL REVERSE POSITION

Using the manual shift lever on the pump controller, shift the pump to full reverse (down) and measure the fan speed, it should be 1700-1800 rpm.

10.13

Tigercat 720D Feller Buncher

Oil Cooler/Radiator and Cross-flow Fan

CHECK FAN DRIVE PUMP PRESSURE: 1.

WARNING

Operate machine to raise hydraulic oil to operating temperature (120°F - 140°F).

2.

Park the machine on level ground. Parking brake ON, felling head on ground and engine OFF.

3.

Install two 0-5000 psi gauges on 'M1' and 'M2' test ports. Install one 0-500 psi gauge on fan charge pressure 'M3' test port.

COUPLING TO ENGINE

RETURN TANK PORT

'M1' TEST PORT (FORWARD RELIEF) 'M2' TEST PORT (REVERSE RELIEF)

• • REVERSE MAXIMUM DISPLACEMENT ADJUSTING SCREW 5/32' ALLEN KEY 1/2" WRENCH

••

••

Monitor hydraulic oil temperature and engine coolant temperatures closely when the fan motor is disconnected.

Stop engine if the hydraulic oil temperature rises above 160°F and the engine coolant temperature above 200 °F. 5.

Start the engine. Leave the parking brake ON.

6.

Adjust the throttle control until the engine is running at 2200 rpm.

7.

Verify that the fan drive charge pump pressure, 'M3' gauge, reads 200-210 psi.

8.

If necessary adjust the charge pump pressure using the charge pressure adjusting screw.

CHARGE PRESSURE RELIEF ADJUSTING SCREW

'M3' TEST PORT (CHARGE PRESSURE) REMOTE MOUNTED

••

•

FAN DRIVE PUMP

724D-D37

REAR CHASSIS RH SIDE

SHOWN WITH HOSES REMOVED FOR CLARITY

FAN CHARGE PRESSURE 'M3' TEST PORT 724D-D20

4.

346-1

••

9.

GAUGE CONNECTIONS

Disconnect the main hoses going into the fan motor and plug using two 12 ORS plugs.

FAN DRIVE PUMP - REAR VIEW Adjust engine speed to 1000 rpm.

10. Shift the pump to full forward using the hand lever on the pump. Verify that the 'M1' gauge reading is 3700-3900 psi. Note the pressure has a tendency to drop slightly while holding the lever shifted fully, this is acceptable.

11. Shift the pump to full reverse using the hand lever on the pump. Verify that the 'M2' gauge reading is 3700-3900 psi. Note the pressure has a tendency to drop slightly while holding the lever shifted fully, this is acceptable.

DISCONNECT MAIN HOSES AND PLUG WITH 12 ORS PLUGS.

••

••

12. If 'M1' and 'M2' gauge readings are incorrect contact Tigercat Customer Service for more information as the relief valves are not adjustable.

••

13. Reconnect hoses to fan motor.

324-10

14. Check for hydraulic oil leaks. Stop the engine and remove gauges from test port connections.

FAN DRIVE MOTOR 10.14

Tigercat 720D Feller Buncher

Oil Cooler/Radiator and Cross-flow Fan

ELECTRONIC FAN DRIVE CONTROL (FDC)

If the readings taken compare favourably with the reading shown in the chart then the sensor is OK.

CHECK FOR TEMPERATURE SENSOR FAILURE: An Ohms meter and an infrared temperature probe (heat gun) are required for this test.

Both the engine coolant and hydraulic oil temperature sensors may be checked for faulty operation by performing a "resistance" check. This involves checking the resistance value of the sensor across the sensor terminals with the coolant or hydraulic oil at a specific temperature level.

10. If the temperature sensor is faulty the resistance reading on the Ohms meter will most likely be zero.

11. Replace sensor and/or reconnect wires.

12. Perform the same test with the Hydraulic oil temperature sensor using the same chart.

HYDRAULIC OIL TANK

The check may be performed without removing the sensor. Use the chart below as a guide for temperature to resistance values.

SENSOR RESISTANCE CHECK TEMP. OHMS 120°F (49°C) 796 ± 5% 140°F (60°C) 561 ± 5% 160°F (71°C) 395 ± 8% 180°F (82°C) 279 ± 8% 200°F (93°C) 196 ± 8% 220°F (104°C 138 ± 8%

•

••

•• •

SENSOR

724D-D39

SENSOR

HYDROSTATIC DRIVE CHARGE PRESSURE FILTER

HYD. OIL TEMPERATURE SENSOR

CHECK MINIMUM FAN SPEED WITH A/C "ON" AND NO A/C DURING CLEAN (PURGE) MODE NOTE: A calibrated "electronic photo tachometer" is required for this procedure.

1.

Disconnect wires from FDC engine coolant temperature sensor.

Ensure that engine coolant and hydraulic oil temperatures are well below the normal operating temperatures of 191°F coolant and 131°F hydraulic oil throughout entire test or fan will rotate and test will be invalid.

2.

Place a piece of reflecting tape on the fan hub.

2.

Start the engine. Leave the parking brake ON.

3.

Start the engine. Leave the parking brake ON.

3.

Set throttle control to IDLE (1000 rpm).

4.

Set throttle control to 2200 rpm.

4.

Place A/C switch in OFF position.

5.

Place FAN switch in AUTO position.

5.

Place FAN switch in AUTO position.

6.

Place A/C switch in ON position.

8.

Stop engine when engine coolant temperature gauge in cab reads close to a value shown in the above chart.

7.

Use a photo-tachometer to measure the speed of rotation of the fan blade, it should be 1140-1200 rpm.

7.

Aim the heat gun at the coolant pipe close to the temperature sensor and take a temperature reading, note the reading.

8.

8.

Connect the Ohms meter to the two terminals on the temperature sensor and note resistance value.

With the help of an assistant press and hold the fan switch in the CLEAN (PURGE) position and visually check clutch on A/C compressor. It should be disengaged and compressor not running.

9.

When the CLEAN (PURGE) switch is released the clutch on the A/C compressor should engage and the compressor should be running.

724D-D40

ENGINE COOLANT TEMPERATURE SENSOR 1.

9.

Use the SENSOR RESISTANCE CHECK chart and compare readings.

10.15

Tigercat 720D Feller Buncher

Oil Cooler/Radiator and Cross-flow Fan

CHECK VARIABLE FAN SPEED WHEN CONTROLLED BY ENGINE COOLANT TEMPERATURE: NOTE: A calibrated "electronic photo tachometer" is required for this procedure.

10. Use the photo-tachometer to measure the rpm. of the fan at this temperature of 201°F, it should be 2100-2200 rpm.

11. Remove the cardboard from the radiator.

12. The engine coolant temperature will start to decrease. Verify that the fan speed decreases relative to the decrease in the engine coolant temperature. NOTE, This will happen quickly and can be verified visually without the use of the photo-tachometer.

1.

Complete TEMPERATURE SENSOR FAILURE VERIFICATION test.

2.

Place a piece of reflecting tape on the fan hub.

3.

Place A/C switch in OFF position.

4.

Cover only the radiator portion of the cooling assembly with cardboard.

5.

Start engine. Leave paring brake ON.

6.

Set throttle control to 2200 rpm and raise engine coolant temperature to 170°F-180°F on gauge.

13. The fan speed should slow down and settle at 800-840 rpm with engine speed of 2200 rpm and engine coolant temperature steady at 195°F, with a 195°F thermostat.

14. Replace FDC processing module if this test fails.

IMPORTANT NOTE: Monitor hydraulic oil temperature closely throughout test. Abort test if hydraulic oil temperature climbs above 131°F. Operator should be instructed to activate functions for 5 seconds and then release for 5 seconds to avoid overheating of valve by hydraulic oil as it passes over the reliefs during the following procedures.

7.

Operate RH JOYSTICK to raise boom to upper limit and hold joystick in BOOM UP position for 5 seconds and then release for 5 seconds (see IMPORTANT NOTE) This will impose a load on the engine and cause the engine coolant temperature to rise.

8.

Observe the engine coolant temperature gauge during this process, when the gauge settles down and reads a steady temperature and then begins to rise, the fan should begin to slowly rotate. The engine coolant temperature should be approximately 191°F.

9.

Continue with step (7) to increase the engine coolant temperature to 201°F while at the same time verifying that the rpm of the fan increases proportionally with the increase in temperature of the engine coolant.

10.16

••

724D-D38

FDC PROCESSING MODULE

FDC PROCESSING MODULE

Tigercat 720D Feller Buncher

Oil Cooler/Radiator and Cross-flow Fan

CHECK VARIABLE FAN SPEED WHEN CONTROLLED BY HYDRAULIC OIL TEMPERATURE: NOTE: A calibrated "electronic photo tachometer" is required for this procedure.

11. Use the photo-tachometer to measure the rpm of the fan at this temperature of 153°F, it should be 2200 rpm. with an engine speed of 2200 rpm 12. Remove the cardboard from the oil cooler.

1.

Complete the TEMPERATURE SENSOR FAILURE VERIFICATION test.

2.

Place a piece of reflecting tape on the fan hub.

3.

Disconnect wire from th FDC engine coolant temperature sensor and install a spare sensor of the same type on the sensor wires. Suspend the spare sensor in a cooler location so that it is not in contact with any hot engine parts. This is nesessary to prevent the engine coolant temperature sensor from interfering with this hydraulic oil temperature sensor test.

4.

Place A/C switch in OFF position.

5.

Cover only the oil cooler portion of the cooling assembly with cardboard.

6.

Start engine. Leave paring brake ON.

7.

Set throttle control to 2200 rpm and raise hydraulic oil temperature to 131°F on gauge.

13. The hydraulic oil temperature will start to decrease. Verify that the fan speed decreases relative to the decrease in the hydraulic oil temperature. NOTE, This will happen quickly and can be verified visually without the use of the photo-tachometer.

14. The fan should stop rotating at approximately 131°F. 15. If the test was successful, remove the spare engine coolant sensor and re-connect the sensor wires to the FDC sensor in the hydraulic tank 16. Replace FDC processing module if this test failed.

IMPORTANT NOTE: Monitor engine coolant temperature closely throughout test. Abort test if engine coolant temperature climbs above 200°F.

••

Operator should be instructed to activate functions for 5 seconds and then release for 5 seconds to avoid overheating of valve by hydraulic oil as it passes over the reliefs during the following procedures.

8.

Operate RH JOYSTICK to raise boom to upper limit and hold joystick in BOOM UP position for 5 seconds and then release for 5 seconds (see IMPORTANT NOTE) This will cause the hydraulic oil temperature to rise.

9.

Observe the hydraulic oil temperature gauge during this process, when the gauge settles down and reads a steady temperature and then begins to rise, the fan should begin to slowly rotate. The hydraulic oil temperature should be approximately 131°F.

10. Continue with step (8) to increase the hydraulic oil temperature to 153°F while at the same time verifying that the rpm of the fan increases proportionally with the increase in temperature of the hydraulic oil.

10.17

724D-D38

FDC PROCESSING MODULE

FDC PROCESSING MODULE

Tigercat 720D Feller Buncher

Oil Cooler/Radiator and Cross-flow Fan

TROUBLE-SHOOTING GUIDE FOR F.D.C. OPERATION SYMPTOM A The fan will not operate when the FAN switch is in the AUTO position.

B The fan will not rotate in reverse direction

C The fan operates in the wrong direction when FAN switch is in AUTO position.

D The fan operates in the

E

wrong direction when the FAN switch is NOT in the AUTO position.

The fan will not go to FULL rpm using FULL ON (OVERRIDE) position on FAN switch.

F The fan will not CLEAN (PURGE).

G The fan operates in FULL ON (OVERRIDE) forward direction when FAN switch is in AUTO position; both hydraulic oil & engine coolant temperatures are cold.

INSPECT

CORRECTION/REPAIR

FDC supply power fuse is blown.

FDC supply power wire is damaged.

Replace fuse; 15 AMP rating Repair damaged section of wire with correct gage wire, and route/guard wire to prevent future damage.

Replace FDC Replace complete coil assembly in EDC.

Faulty FDC. Check condition of forward coil, Check resistance is 20 Ohms across terminals A and B of pump controller (EDC).

Check all wire 17 connections between the FAN switch and the EDC pump controller.

Check 47 Ohms resister in wire 17 at terminal strip Check condition of reverse coil (resistance 16 Ohms) across terminals C and D of pump controller (EDC).

Locate wires at pump connector, check wire-to-terminal locations as follows: A=91, B=88A, C=17, D=G81.

Check FAN switch wire-to-terminal connections, should be as follows: 39=1, 26A=2B, 17 & 89 = 3.

Diode & resistor orientation between wires 88 & 88A incorrect.

Connection for diode &/or resistor between wires 88 & 88A damaged.

Reverse resistor connection may be damaged.

Temperature sensor (hydraulic oil & engine coolant) electrical connectors are not properly installed onto temperature sensors.

Frayed or corroded wires at temperature sensor(s).

Failed temperature sensor(s), check resistance value; see THIS SERVICE MANUAL.

Re-connect wires.

Replace 47 Ohms resister Replace complete coil assembly

Remove & reinstall wires at pump connector for wire-to-terminal locations as follows: A=91, B=88A, C=17, D=G81.

Remove & reinstall wires on the selector switch as follows: 39=1, 26A=2B, 17 & 89 = 3.

Correct diode &/or resistor location/orientation between wires 88 & 88A Repair damaged connection, or replace damaged diode/resistor Repair/replace damaged connection/resistor; 47 Ohms Ensure proper connections between electrical connector and temperature sensor(s) Repair or replace as required Replace temperature sensor(s) if required

TROUBLESHOOTING.DOC/PDF

TROUBLE-SHOOTING GUIDE FOR OVERHEATING PROBLEMS The following is a list of problems that would cause a feller buncher to overheat. All items are equally important and each must be considered.

1.

2.

3.

4.

5.

6.

7.

8.

9.

Dirty Radiator Low Coolant Level Low Oil Level Dirty Air Filter Improper Grade of Fuel Faulty Thermostats Faulty Coolant Pump Coolant Gauge Malfunction Defective Water Pump (Belt)

10.

11.

12.

13.

14.

15.

16.

17.

10.18

Air Recirculation Gaps between Radiator & Shroud Fan Engagement inlo Shroud Corroded Coolant Passages Excess Fuel Delivery from Injection Pump Incorrect lnjection Pump Timing Internal Failure of Deaeration System Operator Induced Problem

Tigercat 720D Feller Buncher SECTION 11- STEERING AND CENTER JOINT JANUARY 2002

CONTENTS - SECTION 11 CENTER JOINT ADJUSTMENT ............................................................. 11.10 CHECKING .................................................................. 11.10 DIAGRAM .................................................................... 11.11 GREASE SEALS ......................................................... 11.11 LUBRICATION ............................................................. 11.10 MAINTENANCE ........................................................... 11.10 CIRCUIT DESCRIPTION ................................................ 11.6 CIRCUIT DIAGRAM ........................................................ 11.7 JOYSTICK CONTROL VALVE ......................................... 11.5 PRESSURE SETTINGS .................................................. 11.8 SAFETY .......................................................................... 11.8 STEER RELIEF VALVE ................................................... 11.4 STEER VALVE ................................................................. 11.4 CROSS SECTION ....................................................... 11.4 DESCRIPTION ............................................................ 11.4 OPERATING DESCRIPTION ....................................... 11.4 STEER/BOOM PUMP ..................................................... 11.2

Tigercat 720D Feller Buncher STEER/BOOM PUMP

Steering and Center Joint OUTLET

This is a double gear pump mounted to the lower left output pad of the pump drive gearbox. The pump drive shaft is connected to the gearbox via a splined adapter.

DRIVEN (IDLER) GEAR

DRIVE GEAR

•

•

The shaft end section of the pump supplies hydraulic oil for the boom and clamp functions.

The cover end section of the pump supplies hydraulic oil for the steering, brake and differential lock functions and oil to the pilot circuit.

The operation of a typical external gear pump (so called because the gear teeth are on the external surface of the hub) is shown in Figure gear1.

INLET

A gear pump carries oil from the inlet to the outlet in the spaces between gear teeth. The pumping chamber is formed by the gears, the pump housing, and side plates. One of the two gears is the drive gear and is connected to the drive shaft.

The other idler gear is driven by the drive gear.

GEAR1

SHAFT END SECTION (BOOM)

•

AP130-1

TYPICAL GEAR PUMP

COVER END SECTION (STEER)

•

STEER/BOOM PUMP

11.2

Tigercat 720D Feller Buncher STEER RELIEF VALVE

Steering and Center Joint

The steer relief valve is located between the steer pump and the steer valve. The steer relief valve protects the steer pump and steer circuit from over pressurizing. Relief oil is directed back to tank via a return filter.

The relief valve is adjusted by loosening the locknut and turning the hex head screw. Turning the hex head screw clockwise increases the TEST PORT

••

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

•• ••

ADJUSTING SCREW

LOCKNUT

• TANK

RPGC

PRESSURE 724D-D04

STEER RELIEF VALVE

RELIEF CARTRIDGE

pressure setting and counter-clockwise decreases the pressure setting. Once the pressure is set correctly, tighten the locknut and re-check the pressure setting. A gauge test port is provided at the relief valve.

11.3

Tigercat 720D Feller Buncher STEER VALVE

Steering and Center Joint

The steer valve is a control valve which consists of an open center spool section, an inlet section and an outlet section. Cartridge type relief valves are installed in both work ports of the spool section.

Shifting the spool directs oil from the steer pump to the steer cylinders.

The port relief valves in the steer valve also function as anti-cavitation relief valve. The return oil from the port relief valves is diverted back to tank via the tank passage in the spool section and the outlet section.

OPERATING DESCRIPTION Oil from the boom/steer pump (via the accumulator charge valve) enters the inlet section of the steer valve, passes through the open center spool section and back to tank via the outlet section.

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

The open center spool has three positions. A spring in the spool end cap holds the spool in the center neutral position. The spool is shifted one way or the other by pilot pressure applied to either end of the spool.

RELIEF VALVE PORT 'A'

PARALLEL PASSAGE

WORK PORT BRIDGE

A

LOAD CHECK VALVE

RELIEF VALVE PORT 'B'

B

SPOOL SPOOL CENTERING SPRING TANK PASSAGE

90136-3

THRU' NEUTRAL PASSAGE

STEERING VALVE CROSS SECTION

11.4

Tigercat 720D Feller Buncher JOYSTICK CONTROL VALVE

Steering and Center Joint OPERATING DESCRIPTION

This pilot valve is a manually operated directional control valve and operates on the same principle as a direct operating pressure reducing valve.

Operated by hand this valve directs pilot pressure to the steer control valve pilot end caps. The spool valve then shifts from its centre position and directs pump flow to operate the corresponding cylinder.

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

When the lever (1) is operated, the plunger (5) is pushed against the return spring (4).

At the same time the regulating spool (2) is moved through the regulating spring (3).

When the regulating stroke begins, there is a connection from port 'P' via hole (8) in the spool and work port 2 or 4 in the base of the valve, to the steer valve pilot end caps.

Pressure provided by the steer/boom pump via the pilot manifold at ports 2 and 4 of the joystick valve is directly proportional to the operator position of the joystick and the regulating spring characteristic. Moving the joystick to the right will steer the machine to the right and moving the joystick to the left will steer the machine to the left.

The steering joystick cannot move forward or back due to stops installed in these plunger ports.

RR-12

JOYSTICK PILOT VALVE

•

•

5

• •

4 3

• •

•

2

•

1

•

'P' PORT WORK PORTS 2 OR 4

AU013-2

SPOOL ARRANGEMENT

AU013-1

11.5

Tigercat 720D Feller Buncher STEER CIRCUIT DESCRIPTION

Steering and Center Joint

Two steer cylinders are used to steer the machine. Operating oil is supplied from the fixed displacement boom/steer pump, via steer relief valve and the accumulator charge valve, to the steer valve. The steer valve controls the flow of oil to and from the steering cylinders. The steering joystick supplies pilot oil to shift the spool in the steer valve.

Moving the joystick to the LEFT directs pilot oil to the "A" port pilot end cap of the steer control valve, this shifts the spool in the control valve and allows oil to flow from the steer pump (via the accumulator charge valve) to the two steer cylinders and steer the machine LEFT. Moving the joystick to the RIGHT directs pilot oil to the "B" port pilot end cap of the steer valve and steers the machine RIGHT. Return oil from the cylinders flows back to the steer valve and is directed back to tank through the outlet section of the steer valve.

The steering "speed" is controlled by the amount the joystick is moved to the right or left. A small movement of the joystick will turn the machine slowly and a large movement of the joystick will turn the machine very rapidly. Relief valves are installed on both ports of the steer valve to prevent over pressurizing of the steer cylinders when the control spool is in the center position.

The steer relief valve is the steer circuit main relief valve. It is set lower than the steer valve port reliefs and is installed in the line between the boom/steer pump and the accumulator charge valve. This protects the system by preventing system pressure from rising above the preset value. Higher system pressures will cause the steer relief valve to direct oil back to tank.

NOTE: Hydraulic lines to the steer cylinders must be cross connected to allow the machine to steer while being towed by another vehicle. For complete towing information, refer to TOWING INSTRUCTIONS in SECTION 2 of the OPERATOR'S MANUAL.

11.6

Tigercat 720D Feller Buncher

724D-08

Steering and Center Joint

STEER CIRCUIT DIAGRAM 11.7

Tigercat 720D Feller Buncher STEERING PRESSURE SETTINGS

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

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

WARNING

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

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

• Never stand in the articulating zone of the machine during set-up. Always stand on the side opposite to the direction in which the machine is being steered.

• Be aware of machine pinch points that could cause injury. Never place body parts within the range of motion of moving parts.

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

3. Turn the steer relief valve adjusting screw all the way in and then back out two turns.

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

ARTICULATION LOCK BAR

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

RETAINING PIN

•• LYNCH PIN

••

•• 195-24

INSTALL ARTICULATION LOCK BAR

11.8

Tigercat 720D Feller Buncher

Steering and Center Joint

5. Start the engine and set the throttle control to IDLE. 6. Ensure that the hydraulic oil temperature is between 120°F - 140°F.

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

7. While attempting to steer the machine to the RIGHT, set the port 'B' relief on the steer valve to 3200 psi.

PORT 'B' RELIEF

PORT 'A' RELIEF

A B

LEFT

RIGHT

STEER VALVE

AT055

8. While attempting to steer the machine to the LEFT, set the port 'A' relief to 3200 psi.

9. Turn steer relief valve all the way out.

TEST PORT

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

•

•• ••

ADJUSTING SCREW

LOCKNUT

• TANK

RPGC

PRESSURE 724D-D04

STEER RELIEF

RELIEF CARTRIDGE

10. Move the throttle control to the FULL position.

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

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

13. Remove the articulation lock bar and place it in the storage position.

11.9

Tigercat 720D Feller Buncher

Steering and Center Joint

CENTER JOINT MAINTENANCE OF CENTER JOINT Maintenance in this area is usually limited to: a) Regular lubrication of the two center joint grease fittings (items 11) to purge the pivot bearings of debris and water. Refer to SCHEDULED MAINTENANCE in SECTION 3 of THIS MANUAL for lubrication intervals.

Use only high quality, lithium based EP2 grease containing molybdenum disulphide.

4. Partially depress the plunger end of the dial indicator against the bottom surface of the front chassis upper lug 'B' as close to center pin as possible. Zero the dial indicator.

5. Fully loosen only the 6 bottom pin retainer bolts (item 2) that were torqued in step 2.

DIAL INDICATOR PLUNGER

B

•• ••

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

REAR CHASSIS

DIAL INDICATOR FRONT CHASSIS

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

DIAL INDICATOR BASE

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

267-17

• A

CHECK PRELOAD

6. The dial indicator should now show a change of 0.008" to 0.012" between lug 'A' and 'B'.

This is the proper bearing preload setting.

FRONT CHASSIS

CHECK FOR MOVEMENT IN THIS JOINT AREA

267-8

A change of less than 0.008" indicates that the bearing preload is too low. No change on the dial indicator is the result of a loose center joint. In these cases, proceed to CENTER JOINT PRELOAD ADJUSTMENT.

REAR CHASSIS

1000 HOUR CHECK

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

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

CENTER JOINT PRELOAD ADJUSTMENT Before making any adjustments to the center joint, please follow CHECKING THE CENTER JOINT BEARING procedure in THIS SECTION. With dial indicator still in place; 7. Remove all bottom pin retainer bolts (item 2), the bottom pin retainer plate (item 3) and all of the shims in the shim pack (items 10).

CAUTION: Keep upward pressure on the bottom pin (item 9) and do not allow pin to fall out from bearing. These pivot pins are very heavy, block the pin in place if necessary.

2. Torque the 6 top and 6 bottom retainer bolts (items 1 and 2) to 282 - 310 lbf-ft.

3. Place the magnetic base of a dial indicator on the top surface of the front chassis lower lug 'A' as close to the center pin as possible.

8. Remove the thinnest shim from the pack.

9. Reinstall the remaining shims, the retainer plate and the bolts. Leave the bolts loose.

10. Zero the dial indicator again and torque the 6 bottom bolts in sequence to 282 - 310 lbf-ft.

11.10

Tigercat 720D 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) was not thin enough. Obtain a thinner shim and put it back into the 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. 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 LOCTITE REQUIRED

•

The two seals installed on either side of the top bearing must be installed with the seal garter spring facing UP.

•

The two seals installed on either side of the bottom bearing must be installed with the seal garter spring facing DOWN.

Apply Loctite (blue - removable) or equivalent and torque the six bolts (item 7) for the bearing retainer plate (item 8) to 80 - 88 lbf-ft.

1

•

GREASE SEALS WITH SPRINGS FACING UPWARD

REAR CHASSIS 11

• •

• FRONT CHASSIS • 6

• • •

726B09

• • •

10 3

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

4 5

• GREASE SEALS WITH SPRINGS FACING DOWN

9

• CENTER JOINT 11.11

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

Tigercat 720D Feller Buncher

Steering and Center Joint

11.12

Tigercat 720D Feller Buncher SECTION 12 - LIFT BOOM JANUARY 2002

CONTENTS - SECTION 12 BOOM LIFT LOCK ....................................................................................................................12.6 BOOM VALVE ASSEMBLY PROCEDURE .................................................................................................... 12.8 CROSS SECTION OF SPOOL SECTION ............................................................................. 12.3 OPERATING DESCRIPTION ................................................................................................. 12.2 RELIEF VALVES ......................................................... SEE SECTION 18 - CLAMPS WITH SAW CIRCUIT DESCRIPTION ..........................................................................................................12.4 CIRCUIT DIAGRAM ..................................................................................................................12.5 JOYSTICK CONTROL VALVE ...................................................................................................12.2 OPERATING DESCRIPTION ................................................................................................. 12.2 PRESSURE SETTINGS ............................................................................................................12.6 PUMP, DESCRIPTION BOOM/STEER PUMP ................................................................ SEE SECTION 11 - STEERING SAFETY ....................................................................................................................................12.6

Tigercat 720D Feller Buncher BOOM JOYSTICK VALVE

Lift boom OPERATING DESCRIPTION

The boom joystick pilot valve is a manually operated directional control valve and operates on the same principle as a direct operating pressure reducing valve. Operated by hand, this valve directs pilot pressure to the boom valve pilot end caps. The corresponding spool valve then shifts from its centre position and directs pump flow to operate the corresponding cylinder.

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

When the lever (1) is operated, the plunger (5) is pushed against the return spring (4).

At the same time, the regulating spool (2) is moved through the regulating spring (3).

When the regulating stroke begins, there is a connection from port 'P' via the hole (8) in the spool and work ports 1, 2, 3 or 4 in the base of the valve, to the boom valve pilot end caps.

Pressure provided by the steer/boom pump via the pilot manifold at ports 1, 2, 3 and 4 of the joystick valve is directly proportional to the operator position of the joystick and the regulating spring characteristic.

BOOM VALVE The boom valve consists of four open center spool sections and one 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.

OPERATING DESCRIPTION

JOYSTICK PILOT VALVE

RR-12

'P' PORT

AUO13-2

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).

•

•

5

• •

4 3

• •

•

2

•

1

•

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.

WORK PORTS 1, 2, 3 OR 4

SPOOL ARRANGEMENT

12.2

Tigercat 720D Feller Buncher

Lift boom

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

LIFT 'DOWN' PORT RELIEF

•

(2200 PSI)

LIFT 'UP' PORT RELIEF (2900 PSI)

•

•

LIFT

MID INLET GAUGE TEST PORT

•

•

MID INLET MAIN RELIEF (2600 PSI)

•

MID. INLET SECTION

• **NOTE**

SAW MAIN RELIEF

•

SHEAR AND CLAMP SPOOL SECTION FOR BUNCHING SHEAR INSTALLATIONS

BOOM CONTROL VALVE WITH SAW

AT023B

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 720D Feller Buncher CIRCUIT DESCRIPTION

Lift boom

The boom valve in use will vary depending on whether a saw attachment or bunching shear is being used. Which ever valve is used, the following circuit description and pressure setting procedures will apply for both.

Two cylinders are used to raise and lower the felling head. The boom cylinders receive oil from a fixed displacement pump via the LIFT spool section in the boom valve. The lift spool section in the boom valve is pilot operated at both ends.

Pilot oil from the boom (right hand) joystick control valve in the operator's cab shifts the spool. The spool directs oil from the pump to either end of the cylinders and from the cylinders back to tank via the oil cooler and primary return double filter.

12.4

Tigercat 720D Feller Buncher

724D-09

Lift boom

LIFT BOOM CIRCUIT (SHOWN WITH SAW VALVE SECTION) 12.5

Tigercat 720D Feller Buncher PRESSURE SETTINGS

Lift boom WARNING

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

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

Before starting this procedure, read the following safety precautions:~ • Never reach between boom crank arms or link arms during machine set-up.

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

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

5. Turn both lift spool section port relief valve adjusting screws OUT until spring pressure is relieved then turn adjusting screws one full turn IN.

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

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

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

IMPORTANT During the following procedures, DO NOT hold ANY function control for LONGER THAN 5 SECONDS.

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

7. Ensure that the hydraulic oil temperature is between 120°F - 140°F. 8. While holding the joystick in the LIFT UP position (fully extended), check gauge pressure reading.

2. Completely raise lift boom and install lift boom cylinder lock over one of the two cylinder rods with the open side at the bottom and wide end up against the keeper plate bolt heads. Install retaining bolt and locknut through center hole. Slowly lower boom until lock is securely held in place.

If less than 2900 psi, lower boom to rest against lock, stop engine and readjust LIFT UP port relief. Repeat above procedure until a gauge reading of 2900 psi is obtained.

IMPORTANT Approach the gauge reading slowly and deliberately by turning the adjusting screw in a little at a time. The pressure setting must not exceed the above value.

WARNING

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

• Always install 'T' handle retainer bolt • Use only to support boom and cutting head • Do not use to set hydraulics pressures 3. Connect a 0 - 5000 psi pressure gauge (with at least 4' of hose) to the boom control valve mid inlet test port.

12.6

Tigercat 720D Feller Buncher

Lift boom

9. Remove lift boom cylinder lock. It is not designed to withstand high forces created by the hydraulic system. Never use this cylinder lock to set boom down port relief.

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

If less than 2200 psi, release pressure in rod end of lift cylinders and allow felling head to sit on the ground. Stop engine and readjust LIFT DOWN port relief. Repeat above procedure until a gauge reading of 2200 psi is obtained.

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

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

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

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

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

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

12.7

Tigercat 720D 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, a load check poppet and a load check spring. Tools required for basic valve assembly include a 3/4" and 11/16" wrench and a torque wrench with thin wall sockets.

5. Position valve assembly with the mounting pads of the end sections on a flat surface. To obtain proper alignment of end sections relative to the spool sections, apply downward pressure to the end sections and snug the tie rod nuts to 10 lbf-ft.

Torque the two 11/16" nuts at 45-50 lbf-ft.

2. Assemble tie rod nuts to one end of each tie rod with one or two threads showing. Insert tie rods through rod holes in inlet section (larger diameter rod at top). Lay inlet section on end with tie rods up. Place the "O" ring in position within the groove.

Torque the 3/4" nut at 70-80 lbf-ft.

6. Install auxiliary valves and plugs and torque to proper values.

3. Place first spool section ("O" ring side facing up) on the inlet section. Position "O" ring in to groove and insert load check poppet (nose down) and spring (behind poppet) into load check cavity as shown. Repeat this procedure for each spool section. The load check springs are compressed by the following sections during assembly.

12.8

Tigercat 720D Feller Buncher SECTION 13 - TILT JANUARY 2002

CONTENTS - SECTION 13 BOOM LIFT LOCK ................................................................................................. 13.4 BOOM VALVE DIAGRAM ....................................................................................... 13.2 CIRCUIT DESCRIPTION ....................................................................................... 13.2 CIRCUIT DIAGRAM ............................................................................................... 13.3 CONTROL VALVES ................................................................................................ 13.2 PRESSURE SETTINGS ......................................................................................... 13.4 SAFETY ................................................................................................................. 13.4

Tigercat 720D Feller Buncher

Tilt

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

MAIN RELIEF (2600 psi)

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

AT023A

BOOM VALVE (SHOWN WITH SAW)

CONTROL VALVES

CIRCUIT DESCRIPTION

For a complete description of the boom valve, refer to BOOM VALVE in SECTION 12 of THIS MANUAL.

The boom valve in use will vary depending on whether a saw attachment or bunching shear is being used. Which ever valve is used, the following circuit description and pressure setting procedures will apply for both.

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

The boom valve is located on the front chassis above the front axle, behind the cover plate.

Two cylinders are used to tilt the felling head forward and back. The cylinders receive oil from the fixed displacement boom/steer pump via the TILT spool section in the boom control valve. The tilt spool section in this control valve is pilot operated at both ends. It receives pilot oil from the boom joystick control valve in the operator's cab to shift the spool. The spool directs oil from the pump to either end of the cylinders and from the cylinders back to tank via the oil cooler and primary return double filter.

13.2

Tigercat 720D Feller Buncher

724D-10

Tilt

TILT CIRCUIT (SHOWN WITH SAW VALVE SECTION) 13.3

Tigercat 720D Feller Buncher PRESSURE SETTINGS

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

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

5. Turn both tilt spool section port relief valve adjusting screws OUT until spring pressure is relieved then turn adjusting screws one full turn IN.

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

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

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

7. Ensure that the hydraulic oil temperature is between 120°F - 140°F.

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

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

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

If less than 2900 psi, lower felling head to the ground, stop engine and readjust TILT OUT port relief. Repeat above procedure until a gauge reading of 2900 psi is obtained.

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

IMPORTANT WARNING

During the following procedures, DO NOT hold ANY function control for LONGER THAN 5 SECONDS.

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

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

If less than 2900 psi, lower felling head to the ground. Stop engine and readjust TILT IN port relief. Repeat above procedure until a gauge reading of 2900 psi is obtained.

2. Completely raise lift boom and install lift boom cylinder lock over one of the two cylinder rods with the open side at the bottom and wide end up against the keeper plate bolt heads. Install retaining bolt and locknut through center hole.

Slowly lower boom until lock is securely held in place.

IMPORTANT Approach the gauge reading slowly and deliberately by turning the adjusting screw in a little at a time. The pressure setting must not exceed the above value.

WARNING

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

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

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

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

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

3. Connect a 0 - 5000 psi pressure gauge (with at least 4' of hose) to the mid inlet test port.

12. While holding the joystick in the TILT IN position, check gauge pressure reading.

If less than 2600 psi, lower felling head to the ground. Stop engine and readjust the mid inlet main relief. Repeat above procedure until a gauge reading of 2600 psi is obtained.

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

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

13.4

Tigercat 720D Feller Buncher SECTION 17 - SAW DRIVE JANUARY 2002

CONTENTS - SECTION 17 CIRCUIT DESCRIPTION ................................................................................ 17.4 CIRCUIT DIAGRAM ........................................................................................ 17.5 PRESSURE SETTINGS .................................................................................. 17.6 SAFETY .......................................................................................................... 17.6 SAW MOTOR ....................................... SEE SAW MANUFACTURER'S MANUAL SAW PUMP POR. VALVE ................................................................................................. 17.7 TEST PORT ................................................................................................. 17.7 SAW VALVES PILOT OPERATED SOLENOID VALVE ....................................................... 17.2 SAW SECTION OF BOOM VALVE ............................................................... 17.3

Tigercat 720D 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 saw valve which is part of the boom valve.

SOLENOID OPERATED PILOT VALVE For a description of the pilot valve refer to PILOT MANIFOLD SECTION 5 of THIS MANUAL. 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 saw valve spool section.

SOLENOID TO SAW SWITCH

• TO BOOM/SAW MAIN VALVE

•

TEST PORT

• • C8

720B16

PILOT MANIFOLD (SAW)

17.2

Tigercat 720D Feller Buncher

Saw drive LOAD CHECK VALVE

PARALLEL PASSAGE

A

PLUG

WORK PORT BRIDGE

B PLUG

PILOT END CAP

SPOOL CENTERING SPRING

SPOOL TANK PASSAGE

THRU' NEUTRAL PASSAGE

90136-4

PILOT END CAP

CROSS SECTION OF SAW SPOOL SECTION For a detailed description of relief valves, refer to RELIEF VALVES in SECTION 18 of THIS MANUAL.

SAW VALVE The 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.

SAW SPOOL SECTION

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

SAW RELIEF (3900 PSI)

For a detailed description of the BOOM valve, refer to SECTION 12 of THIS MANUAL.

•

OPERATING DESCRIPTION Oil (system pressure) enters the end inlet section of the boom 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.

TO SAW GAUGE ON SIDESTAND

•

• 724D-D20

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.

•• SAW INLET SECTION

SAW SECTION OF BOOM CONTROL VALVE OUTLET SECTION

•

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.

The saw relief valve installed in the saw end inlet section of the boom valve protects the pump in case of failure of the POR. 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.

SAW END INLET SECTION TO GAUGE ON SIDESTAND AT023S

17.3

•

• •

SAW RELIEF (3900 PSI)

BOOM VALVE (SAW SECTION)

Tigercat 720D Feller Buncher SAW CIRCUIT DESCRIPTION

Saw drive With the saw switch in the OFF position, the solenoid operated pilot valve is in the de-energized position preventing pilot oil flow from shifting the spool in the saw valve.

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 section of the boom/saw valve. The saw valve is pilot operated and controls the flow of hydraulic oil from the pump to the motor. A relief valve is installed in the saw inlet section of the saw valve.

A solenoid operated pilot valve (C8) in the pilot manifold controls the flow of pilot oil to the end of the spool section in the saw 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.

724D-12

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 saw 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

SAW PUMP SCHEMATIC DIAGRAM

With the saw switch OFF and the engine running, the saw pump is turning and providing oil flow to the saw circuit. In this condition the pump is held at maximum displacement, controlled by the pressure override (POR.) valve in the pump. Oil flows to the saw valve, through the "open center" spool in the valve and back to tank.

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

During the early stages as the saw blade gains momentum, system pressure will rise above the pump's POR. setting of 3600 psi. and cause the spool in the pump POR. valve to shift and direct oil to the opposite end of the pump swashplate control piston. The piston will move the swashplate towards the neutral position, this will cut back the flow of oil from the pump while at the same time maintaining system pressure and continue to turn the blade. As the saw blade gains momentum system pressure will drop below the pump POR. setting.

To maximize pump and motor life, do not shut the engine off until the saw blade has come to a complete stop.

This system leads to a lower horsepower requirement and reduces heat generation since the pump reduces pump output rather than 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. 17.4

Tigercat 720D Feller Buncher

724D-11

Saw drive

SAW CIRCUIT DIAGRAM Tigercat DW5000, DW5500, DW5600 and SW5700 Bunching Saws Koehring Waterous 18" and 20" Felling Heads 17.5

Tigercat 720D Feller Buncher

Saw drive

PRESSURE SETTINGS:

1. Park machine on level ground, lower saw head to approximately 6" off the ground, set parking brake ON. Install articulation lock bar, block wheels and stop engine.

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

Never assume that other workers are aware of disc saw dangers.

•

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

•

Guards, wear plates and covers must be properly attached during operation of saw blade.

•

Do not, under any circumstances, overspeed the saw blade RPM.

•

Be aware that the saw blade is virtually silent as it coasts to a stop.

•

A slowly rotating blade can crush bones.

Beware pinch points when rotating blade by hand.

•

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

2. Remove all guards and check that the area in and around the saw blade is free of loose objects (wood, stones, nuts, bolts, etc.).

Make sure all tools and spare parts are removed from the saw head area.

3. Rotate blade slowly by hand and check for "runout " and "wobble ".

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

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.

•

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

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

Tigercat 720D Feller Buncher

Saw drive SAW SPOOL SECTION

SAW PUMP

••

•

SAW RELIEF (3900 PSI)

POR. ADJUSTING SCREW. POR. VALVE (3600 PSI)

•

• SECOND STAGE ADJUSTING SCREW DO NOT ADJUST. SEE IMPORTANT NOTE BELOW 724D-D44

TO SAW GAUGE ON SIDESTAND

• •

SAW PUMP

••

GAUGE TEST PORT 724D-D20

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

10a Use gauge on sidestand when adjusting saw valve relief at front of machine.

•

••

SAW SECTION OF BOOM CONTROL VALVE

SAW INLET SECTION

13. Start the engine and raise hydraulic oil temperature to 120°F - 140°F.

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

SAW GAUGE

14. Place throttle control in the IDLE position.

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

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

213-24

11. Loosen locknut and screw POR. valve adjusting screw on the saw pump all the way IN. This is a temporary adjustment until the saw relief valve has been set.

NOTE: Refer to RELIEF VALVE ADJUSTING PROCEDURE in SECTION 18 of THIS MANUAL. 17. Set POR. valve on saw pump to 3600 psi (Gauge at rear of machine).

IMPORTANT NOTE: The SECOND STAGE ADJUSTING SCREW on the pump must not be tampered with or it will affect the performance of the saw. If it is suspected that the adjustment has been changed from the original factory setting, contact the Tigercat Service Department for setup instructions.

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

SET MOTOR POR. (BEGIN OF DISPLACEMENT REGULATION) SET MOTOR MINIMUM DISPLACEMENT

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

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

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

17.7

Tigercat 720D Feller Buncher

Saw drive

17.8

Tigercat 720D Feller Buncher SECTION 18 - CLAMPS WITH SAW JANUARY 2002

CONTENTS - SECTION 18 BOOM LIFT LOCK .......................................................................................... 18.6 BOOM VALVE .................................................................................................. 18.2 OPERATING DESCRIPTION ....................................................................... 18.3 SPOOL SECTION DIAGRAM ...................................................................... 18.3 CIRCUIT DESCRIPTION ................................................................................ 18.4 CIRCUIT DIAGRAM ........................................................................................ 18.5 CONTROL VALVES ......................................................................................... 18.2 PILOT LINE PRESSURES ............................. SEE SECTION 5 - PILOT SYSTEM PRESSURE SETTINGS .................................................................................. 18.6 RELIEF VALVES ADJUSTING PROCEDURE ......................................................................... 18.9 OPERATION ................................................................................................ 18.8 SAFETY .......................................................................................................... 18.6 SPOOL SECTION DIAGRAM ......................................................................... 18.3

Tigercat 720D Feller Buncher CONTROL VALVES

Clamps with Saw 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 clamp foot control valve, two solenoid operated pilot valves in the pilot manifold (accumulator) and a pilot operated boom 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.

Cartridge type port relief valves are installed in both work ports of the clamp spool section and both work ports in the accumulator spool section.

The mid inlet section has a single main relief valve. These reliefs protect the circuits (pumps) from high pressures during operation.

For a complete description of the foot operated pilot valve, refer to FOOT CONTROL VALVE in SECTION 8 of THIS MANUAL. BOOM VALVE The boom valve is located on the front chassis above the front axle and behind the cover plate.

One of the five spool sections is used to open and close the clamp and a second spool section to open and close the accumulating arm.

There are two inlet sections. The end inlet is for the saw spool section and receives oil from the

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, DW5600 AND SW5700 BUNCHING SAWS KOEHRING WATEROUS 20" DISC SAWS

18.2

Tigercat 720D Feller Buncher

Clamps with Saw

OPERATING DESCRIPTION Oil from the variable displacement saw pump enters the end inlet section of the boom 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.

Oil from the fixed displacement boom/steer pump enters the mid inlet section of the boom valve and is allowed to pass through the four open center spool sections and back to tank via the outlet section.

PARALLEL PASSAGE

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

The relief valves installed in the inlet and spool sections of the boom valve protect the pump in case of failure of the POR valve on the pump.

All of the relief valves on the boom valve divert oil to tank via the tank passages in the spool sections and the outlet section of the boom valve.

They also function as anti-cavitation relief valves.

The 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'

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

LOAD CHECK VALVE

A

WORK PORT BRIDGE

RELIEF VALVE PORT 'B'

B

PILOT END CAP

PILOT END CAP SPOOL CENTERING SPRING

SPOOL TANK PASSAGE THRU' NEUTRAL PASSAGE

90136-3

CROSS SECTION OF CLAMP SPOOL SECTION

18.3

Tigercat 720D Feller Buncher CLAMPS WITH SAW

Clamps with Saw

Tigercat DW5000, DW5600 and SW5700 Bunching Saw Heads.

Koehring Waterous 20" Saw Heads.

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

The clamp arm is operated by the clamp foot control valve (left side of cab floor). The left pedal is used to OPEN and the right pedal to CLOSE. Pressing the CLAMP OPEN pedal directs pilot oil to shift the spool in the clamp spool section.

Pressing the CLAMP CLOSE pedal directs pilot oil to the opposite end of the spool to shift it in the opposite direction. The spool directs oil from the pump to either end of the clamp arm cylinder to open or close the arm. Return oil is directed back to tank via the oil cooler.

The accumulating arm is operated by a 3 position thumb switch OPEN/CLOSE (self centering to OFF) located on the right joystick control. The switch operates two solenoid pilot valves on the pilot manifold which direct pilot oil to the accumulator spool section of the boom control valve, to shift the spool. The spool directs oil from the pump to either end of the accumulating arm cylinder to open or close the arm. Return oil is directed back to tank via the oil cooler and dual head return oil filter.

18.4

Tigercat 720D Feller Buncher

Clamps with Saw

ACCUMULATING AND CLAMP ARMS CIRCUIT Tigercat DW5000, DW5600, and SW5700 Bunching Saws Koehring Waterous 20" Disc Saws 724D-13

18.5

Tigercat 720D Feller Buncher PRESSURE SETTINGS

Clamps with Saw TO SET CLAMP AND ACCUMULATOR OPEN AND CLOSE RELIEF VALVES:-

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

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

Before starting this procedure, read the following safety precautions:~ • Never reach between boom crank arms or link arms during machine setup.

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

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

• Keep clamp and accumulator arms closed whenever possible during setup.

• Clamp and accumulator arms open and close very rapidly, always keep clear of operating area.

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

NOTE: This procedure assumes that a Tigercat Bunching Saw Head is used. Follow same procedure for Koehring Waterous 20" Saw Head. Refer to illustration of LIFT BOOM CONTROL VALVE on page 2 for orientation and pressure value references .

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

4. Turn the boom mid inlet main relief adjusting screw all the way IN. 5. Turn the port relief valve adjusting screws on both the accumulator and clamp spool sections of the control valve OUT until spring pressure is relieved then turn adjusting screws one full turn IN. 6. Start the engine, and put the throttle control to the IDLE position.

7. Ensure that the hydraulic oil temperature is between 120°F - 140°F. 8. While holding the left foot pedal down in the CLAMP OPEN position (cylinder fully retracted), check gauge pressure reading.

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

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

IMPORTANT

2. Completely raise lift boom and install lift boom cylinder lock over one of the two cylinder rods with the open side at the bottom and wide end up against the keeper plate bolt heads. Install retaining bolt and locknut through center hole.

Slowly lower boom until lock is securely held in place.

WARNING

During the following procedures, DO NOT hold ANY function control for LONGER THAN 5 SECONDS.

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

IMPORTANT Approach the gauge reading slowly and deliberately by turning the adjusting screw in a little at a time. The pressure setting must not exceed the above value.

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

• Always install 'T' handle retainer bolt • Use only to support boom and cutting head • Do not use to set hydraulics pressures 18.6

Tigercat 720D Feller Buncher

Clamps with Saw

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

If less than 3200 psi, stop engine and readjust clamp close port relief. Repeat above procedure until a gauge reading of 3200 psi is obtained.

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

If less than 3200 psi, stop engine and readjust accumulator open port relief. Repeat above procedure until a gauge reading of 3200 psi is obtained.

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

If less than 3200 psi, stop engine and readjust accumulator close port relief. Repeat above procedure until a gauge reading of 3200 psi is obtained.

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

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

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

14. While holding the joystick thumb switch in the ACCUMULATING ARM OPEN position, check gauge pressure reading.

If less than 2600 psi, stop engine and readjust mid inlet main relief. Repeat above procedure until a gauge reading of 2600 psi is obtained.

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

SET PILOT LINE PRESSURES: NOTE: Refer to SECTION 5 of THIS MANUAL.

18.7

Tigercat 720D 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 18.8

Tigercat 720D Feller Buncher

Clamps with Saw ANTI-CAVITATION RELIEF VALVE ADJUSTING PROCEDURE For relief valve with adjusting screw

ANTI-CAVITATION RELIEF VALVE ADJUSTING PROCEDURE For relief valve with adjusting nut ADJUSTING NUT

•

JAMNUT

ADJUSTING SCREW

•

JAMNUT

• •

RELIEF VALVE 51055-2

RELIEF VALVE

WITH ADJUSTING NUT

51055-20

WITH ADJUSTING SCREW

1.

Loosen jamnut.

1.

Loosen jamnut.

2.

Turn adjusting nut to obtain desired pressure reading on gauge.

2.

Turn adjusting screw to obtain desired pressure reading on gauge.

3.

Lock jamnut against adjusting nut, making sure the adjusting nut does not turn.

3.

5.

Re-check relief setting.

Lock jamnut against relief valve body, making sure the adjusting screw does not turn.

5.

Re-check relief setting.

For complete step-by-step pressure setting procedures of circuits using these relief valves, refer to appropriate sections in THIS MANUAL.

For complete step-by-step pressure setting procedures of circuits using these relief valves, refer to appropriate sections in THIS MANUAL.

18.9

Tigercat 720D Feller Buncher

Clamps with Saw

18.10