Tigercat 718 FELLER BUNCHER Service Manual - PDF DOWNLOAD

SERVICE MANUAL Tigercat 718 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 separate OPERATOR'S MANUAL LUBRICATION AND MAINTENANCE ............................................................................... 3 PILOT SYSTEM ................................................................................................................ 5 ELECTRICAL, GAUGES AND ALARMS ........................................................................... 6 ENGINE ............................................................................................................................. 7 DRIVE ............................................................................................................................... 8 BRAKES AND DIFFERENTIAL LOCKS ............................................................................ 9 OIL COOLER .................................................................................................................. 10 STEERING AND CENTER JOINT .................................................................................. 11 LIFT BOOM ..................................................................................................................... 12 TILT ................................................................................................................................. 13 SAW DRIVE .................................................................................................................... 17 CLAMPS WITH SAW ...................................................................................................... 18 SHEAR WITH CLAMPS .................................................................................................. 19 718SM00

718 Available Literature Operator's Manual ............................... Part Service Manual (this manual) .............. Part Parts Catalog ....................................... Part Hydraulic Adapters Book ..................... Part Hose Assemblies Book ....................... Part

No. No. No. No. No.

15810A 15811A 15809A 1472A 3707A

Tigercat

®

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

Tigercat 718 Feller Buncher

Introduction

ii

Tigercat 718 Feller Buncher

Introduction

Tigercat 718 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 718 Feller Buncher.

The operator's manual will assist the operator with the techniques of proper and safe operation of the 718 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 phrase "and up" appearing in this manual after the serial number implies that the related information is current for any machine serial number HIGHER than the serial number preceding the "and up".

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

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

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

Tigercat Industries Inc.

718D-23

iii

Tigercat 718 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 718 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.

v

Tigercat 718 Feller Buncher

Introduction

vi

Tigercat 718 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 FELLING TREES ........................................................................................... 1.7 FIRE PREVENTION 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 718 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 718 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 718 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 718 Feller Buncher

Safety

GENERAL SAFETY PRECAUTIONS continued

WARNING WARNING 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 718 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 718 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 is 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 718 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 718 Feller Buncher

Safety

OPERATING SAFETY PRECAUTIONS continued

SWITCH

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 718 Feller Buncher

Safety

SERVICING SAFETY PRECAUTIONS

UPPER DOORS

HAND KNOB

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

ENGINE COMPARTMENT ACCESS DOORS AND PANELS RIGHT SIDE

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

QUICK ACCESS

LOWER ACCESS PANELS

Install a DO NOT START ENGINE sign on the operator s cab door and in the engine

RETAINING BRACKETS

718-D22

compartment when making repairs to the machine.

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

ENGINE COMPARTMENT ACCESS DOORS AND PANELS LEFT SIDE

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.

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

This machine is optionally equipped with a Flexxaire fan. This fan has a clean mode which reverses the flow of air to quickly and effectively remove debris from the heat exchangers and air intake screens. Exercise care when operating this function. Ensure that there are no personnel standing near the machine when performing this operation, as dust and debris will fly out.

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

LOWER ACCESS PANELS

718-D21

HAND KNOB

1.10

Tigercat 718 Feller Buncher

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

SERVICING SAFETY PRECAUTIONS continued

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.

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

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

Use the proper tool for the job. Repair or replace

Never use bare hand to check for fluid leaks. cable from both batteries.

Fluid leaks under pressure may not be visible.

When searching for leaks, wear work gloves and use a wrench or piece of wood to move hydraulic

hoses. Do not grab hold of hydraulic hoses. Wear safety goggles for eye protection.

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 performing work on components, or disconnecting any hoses.

For the procedure on how to RELIEVE PRESSURE, refer to PARKING THE MACHINE in THIS SECTION. 1.11

Tigercat 718 Feller Buncher

Safety

SERVICING SAFETY PRECAUTIONS continued

WARNING

worn or damaged tools including lifting equipment immediately.

Keep your hands, feet, head, and loose clothing away from power driven parts. Tie long hair behind your head. Remove rings and other

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 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.

jewellery to prevent electrical shorts and entanglement in moving parts.

Always be aware of machine pinch points that

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

195-24

FRAME ARTICULATION LOCK BAR

could cause injury. Never place body parts within the range of motion of the working parts of the machine.

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.

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 718 Feller Buncher

Safety

SERVICING SAFETY PRECAUTIONS continued

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

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 718 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. 2. Inspect the machine for any signs of fuel or hydraulic system leakage and check for worn or eroded fuel or hydraulic lines before starting up any equipment.

3. Remove debris and blow out dust regularly from the air intake doors, engine radiator, hydraulic oil cooler and A/C condenser core to prevent overheating of the engine and hydraulics. Refer to CLEANING A/C CONDENSER, OIL COOLER AND RADIATOR in SECTION 2 of the OPERATOR S MANUAL. 4. Blow off all debris and dust accumulated near hot engine exhaust components (turbocharger and exhaust manifold as well as exhaust pipes and muffler) at the completion of each work shift or more frequently depending on logging conditions.

Visual inspection after blow off to ensure thorough cleanliness is vital. Engine exhaust systems provide numerous small pockets where saw dust, small wood chips and other flammable forest debris can gather. Even small accumulations close to hot exhaust components can ignite and smolder. If

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.

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

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

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

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

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

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

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

1.14

Tigercat 718 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.

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

Use the PASS method with most extinguishers.

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 718 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

Tigercat 718 Feller Buncher SECTION 3 - LUBRICATION & MAINTENANCE JULY 2002

CONTENTS - SECTION 3 AIR CLEANER MAINTENANCE ................................................................... 3.14 AIR CONDITIONING SYSTEM CHECKING ................................................. 3.18 CENTER JOINT LUBRICATION .......................................................................................... 3.19 MAINTENANCE ........................................................................................ 3.19 DRIVE SHAFT SPLINE LUBRICATION, MIDDLE AND REAR .................... 3.20 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 FILTER .......................... 3.13 HYDRAULIC OILS .......................................................................................... 3.7 NEW MACHINE MAINTENANCE FIRST 50-100 HOUR INSPECTION AND SERVICE REPORT .................. 3.2 INITIAL PRE-DELIVERY INSPECTION ...................................................... 3.2 TIGHTENING POINTS ............................................................................... 3.2 OIL LOST FROM LEAKAGE .......................................................................... 3.2 PRESSURE SETTINGS WITH TIGERCAT SAW ...................................................................................... 3.27 TIGERCAT SHEAR .................................................................................. 3.28 PRESSURIZED WATER SYSTEMMAINTENANCE .................................... 3.16 SCHEDULED MAINTENANCE GENERAL ................................................................................................... 3.3 FREQUENTLY ............................................................................................ 3.4 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 SERVICE AND LUBRICATION POINTS CHART ................................... 3.8, 3.9 STARTUP PROCEDURE AFTER MAINTENANCE ..................................... 3.22 TORQUE CHART ......................................................................................... 3.25 TORQUE CHART, GENERAL ...................................................................... 3.26 TRANSMISSION .......................................................................................... 3.19 CHECK OIL LEVEL .................................................................................. 3.19 WHEELS, INSTALLING ................................................................................. 3.2

Tigercat 718 Feller Buncher

Lubrication and Maintenance

PREVENTIVE MAINTENANCE SCHEDULE FOR 718 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: When installing wheels, ensure that all paint has been removed from the mating surfaces of both the wheel disc and the flange of the axle to ensure metal to metal contact.

All hydraulic connections Hose clamps Center joint pin securing bolts Transmission securing bolts

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

Engine mounting bolts Pump drive gearbox securing bolts

HOUR METER ~ MAINTENANCE:

Axle mounting bolts

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

Wheel retaining bolts Cab securing bolts

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

Pin retainers 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.

_______________________________________________________________________________________ *OIL LOST FROM LEAKAGE

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

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 718 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. of engine enclosure immediately.

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

______________________________________________

3.3

Tigercat 718 Feller Buncher

Lubrication and Maintenance

SCHEDULED MAINTENANCE FREQUENTLY:~

Clean:~ Potentially damaging limbs or sticks from machine

Check engine cooling air intake screens for possible restriction

Air conditioner condenser, oil cooler and radiator

______________________________________________

Check:~ For leakage around hydraulic components and flexible hoses

EVERY 8 HOURS (EVERY SHIFT):~ Perform "frequently" maintenance check, And in addition:~ Check engine oil level

For loose nuts, bolts and fittings

Drain fuel/water separator

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

Condition and tension of fan belts.

Check air intake precleaner, clean as required

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

Check air cleaner unloader valve Check engine air filter restriction indicator Check pump drive gearbox oil level with dipstick

Conduct an overall visual inspection.

Check transmission oil level at dipstick

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

Check hydraulic oil level Lubricate center joint bearings Lubricate attachment refer to manufacturer's manual 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.

______________________________________________

‡ Under normal conditions every 125 hours.

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

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 attachment), purge

3.4

Tigercat 718 Feller Buncher

Lubrication and Maintenance

SCHEDULED MAINTENANCE EVERY 125 HOURS:~

Visually inspect for: Frayed electrical wiring and hydraulic hose

Perform "frequently" maintenance

Wear in any other components

Perform 8 hour maintenance

Clean/replace: Air conditioner re-circulation filter

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

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

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. ‡ Under normal conditions every 125 hours.

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

______________________________________________ EVERY 250 HOURS:~ Perform "frequently" maintenance Perform 8 hour maintenance Perform 125 hour maintenance

Check: Engine coolant level Fuel tank filler screen

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

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

Engine fuel filter Fuel/water separator filter

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

Air intake primary element

Fluid level in batteries unless maintenance free

Oil in transmission

Oil in pump drive gearbox

Engine rpm.

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

Hydraulic pump and motor securing bolts Torque tightening points as per new machine maintenance Proper operation of pressurized water system.

(Refer to section 2 in the operator's manual)

______________________________________________ Continued on page 6

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

3.5

Tigercat 718 Feller Buncher

Lubrication and Maintenance

SCHEDULED MAINTENANCE Continued from page 5

EVERY 500 HOURS:~

EVERY 2000 HOURS:~

Perform "frequently" maintenance

Perform "frequently" maintenance

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. † Hyd. Oil return filter, travel/steer †

And in addition replace:~ Oil in axles, front and rear

Hyd. Oil return filters, saw/boom †

Oil in hydraulic reservoir

Hyd. Oil return filter, pilot †

Water in pressurized water system

Check:~ All hydraulic pressures

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

Perform 1000 hour maintenance

Transmission mounting; Check, re-torque

______________________________________________

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

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.

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

______________________________________________

Drain and refill pressurized water system. (Refer to PRESSURIZED WATER SYSTEM MAINTENANCE in THIS SECTION)

EVERY 1000 HOURS:~ Perform "frequently" maintenance Perform 8 hour maintenance

______________________________________________

Perform 125 hour maintenance Perform 250 hour maintenance Perform 500 hour maintenance And in addition replace :~ Engine air cleaner unloader valve Fuel intake strainer Strainer in accumulator charge valve Check:~ No motion between center joint lugs. Refer to CENTER JOINT MAINTENANCE in THIS SECTION. 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 718 Feller Buncher

Lubrication and Maintenance

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-GARD ) (summer) Type J20D (HY-GARD ) (winter)

3.7

Tigercat 718 Feller Buncher

ATTACHMENT

4 FTG/8

Lubrication and Maintenance

OUTER AXLE BEARINGS 21

4 FTG/8

1

25

7

4

8

22

6 12

13 14 15 5

19

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

24 23 2

BOOM/LINK PINS

1

10 11

9

5 6 16

4 18

REAR DRIVE SHAFT

2 FTG/8

18

CENTER JOINT 3

2 FTG/8

20

22

17

1 FTG/125

MID DRIVE SHAFT*** & FRONT DRIVE SHAFT SUPPORT 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 only Genuine Tigercat replacement Hydraulic oil filters.

NOTE: USE LITHIUM BASED GREASE CONTAINING MOLYBDENUM DISULFIDE.

13028B R10 13028B.PDF 1313

3.8

CHK REP DRN D/R LUB

HOURS CHECK REPLACE DRAIN DRAIN AND REFILL LUBRICATE

Tigercat 718 Feller Buncher

Lubrication and Maintenance

Tigercat® Model 718 SERVICE AND LUBRICATION POINTS REFER TO Tigercat OPERATOR'S MANUAL FOR FURTHER INFORMATION

1

COOLING SYSTEM

2

SCREENS (COOLING SYSTEM)

CHK

3

CENTER JOINT PIVOT

LUB

4

ENGINE OIL AND FILTER CUMMINS B

CHK

CHK

30

14.2 3.75

2

CHECK MOTION BETWEEN CHASSIS LUGS

1

SEE ENGINE MANUFACTURER'S MAINTENANCE MANUAL

5

FUEL FILTER (ENGINE)

REP

1

6

FUEL FILTER/WATER SEPARATOR DRN

REP

1

7 8

FUEL CAP SCREEN

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 PUMP DRIVE GEARBOX

REP V REP V REP V REP V

1

CHK

D/R

4

1.1

TRANSMISSION

CHK

D/R

8.2

2.2

34 28

9.0 7.4

D/R 197

52

13 14 15 16

CHK CHK REP

CHK

1

2

AXLES:

19

HYDRAULIC RESERVOIR

20

PARKING BRAKE

21

ATTACHMENT

LUB

22

PRESSURIZED WATER SYSTEM

CHK TEST

23 24

ACCUMULATOR CHARGE VALVE STRAINER A/C & HEATER FILTERS

25

OUTER AXLE BEARINGS

718LUBCHART.XLS

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 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

17 18

DESCRIPTION

60/40 ANTIFREEZE (GM6035M SPEC.) CLEAN SCREENS AND COOLING CORES(3). SEE SECTION 2 OPERATOR'S MANUAL

8

CHK REP

QTY

USG

LITERS

CAPACITY 2000 $

500 $

250 $

125 $

8$

ITEM

1000 $

SERVICE POINT NO.

SERVICE EVERY

FRONT REAR

D/R D/R 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

3.9

Tigercat 718 Feller Buncher

Lubrication and Maintenance

FILTERS - REMOVE AND REPLACE

Changing the filter:

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 This is a combination unit, with a replaceable fuel filter and a removable water sediment bowl on the bottom of the unit. The water sediment bowl is only replaced if it becomes damaged or nonfunctional. For service and replacement intervals see SERVICE AND LUBRICATION CHART in THIS SECTION.

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

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

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 pre-fill 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 718 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: 1. Park machine on level ground, install articulation lock pin, lower cutting head to ground, stop engine, pull hand brake ON and block wheels.

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

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 718 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. The travel/steer filter is coloured blue indicating that it contains a water absorbing element. For service and replacement intervals see SERVICE AND LUBRICATION CHART in THIS SECTION.

PILOT RETURN FILTER

BOOM/SAW RETURN FILTER, DUAL HEAD

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

HYDROSTATIC CHARGE PUMP PRESSURE FILTER

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.

6. The Tigercat spin-on filter element is supplied with two gaskets. The 718 uses the round ('O' ring style) section gasket for all four return filters. Discard the square section gasket.

718-D15

•• •

•

•

TRAVEL RETURN FILTER WITH WATER ABSORBING ELEMENT (COLOR BLUE)

••

HYDRAULIC OIL RETURN AND CHARGE PRESSURE FILTERS

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.

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).

FILTER HEAD

DO NOT use bottom nut for filter installation or damage/leakage may result. Bottom nut is to assit in filter removal only.

GASKET

12. Start the engine and check for leaks.

FILTER ELEMENT

FILTR_SEALS2

ROUND SECTION GASKET INSTALLATION

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 718 Feller Buncher

Lubrication and Maintenance

HYDROSTATIC CHARGE PUMP PRESSURE FILTER

IMPORTANT HYDRAULIC FILTER SERVICING GUIDELINES

HYDROSTATIC CHARGE PUMP PRESSURE FILTER

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.

•

718-D24 CHARGE PUMP PRESSURE FILTER This single full flow filter, is mounted in the output side of the hydrostatic charge pump. For service and replacement intervals see SERVICE AND LUBRICATION CHART in THIS SECTION.

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.

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

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.

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.

DO NOT use bottom nut for filter installation or damage/leakage may result. Bottom nut is to assit in filter removal only 9. Start the engine and check for leaks.

3.13

Tigercat 718 Feller Buncher

Lubrication and Maintenance

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

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

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

ENGINE AIR PRECLEANER

AIR CLEANER

• •

718-D6

AIR CLEANER AND PRECLEANER

ENGINE AIR CLEANER 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

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

ONLY THE PURIFIED AIR GOES TO THE AIR FILTER

TURBO II PRECLEANER OPERATION 718-D9

FILTER RESTRICTION INDICATOR

A filter restriction indicator is mounted to the output side of the filter, this should show green when the engine is running at high RPM. Service is required if the indicator shows red.

EXHAUST PORT AREA UNLOADER VALVE

•• 718-D8

PRECLEANER REAR VIEW 718-D7

AIR CLEANER UNLOADER VALVE

AIR CLEANER UNLOADER VALVE This rubber valve on the tube 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 3.14

Tigercat 718 Feller Buncher

Lubrication and Maintenance

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 sur e to check the filter elements as they may need replacing as well. Reattach the valve to the tube.

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

PRIMARY ELEMENT

••

OUTLET TUBE

SAFETY ELEMENT

••

Engine exposure to dust during servicing is the largest single 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.

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

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

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

••

ENGINE AIR PRECLEANER 171-18A

IMPROPER SERVICING

4. Always clean the inside of the outlet tube.

5. Check your old filter. It can help you detect foreign material on the sealing surface that is causing leakage.

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

AIR FILTER ELEMENTS

In addition to the LUBRICATION AND MAINTENANCE SCHEDULE in SECTION 3 of this book, the following instructions should also be noted:

6. Inspect the new filter for damage.

The most common and damaging servicing problems are:

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

OVER SERVICING

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.

Filter elements increase in dust cleaning efficiency as dust builds up on the media. Looks can be deceiving. A filter that looks dirty is 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.

NOTE: This does not apply to oil filters

3.15

Tigercat 718 Feller Buncher

Lubrication and Maintenance

PRESSURIZED WATER SYSTEM MAINTENANCE

FILL & CHARGE PRESSURIZED WATER SYSTEM

OPERATION:

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

Turn the hand operated ball valve (shut off valve) under the seat to the ON position to draw water from the 10.5 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

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

WATER SHUT OFF VALVE (SHOWN CLOSED)

••

•

•

CONTROL VALVE

196-16A

CAUTION

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

SYSTEM TEST:

718-D19

c.

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 approximately 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 718 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 718 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.

A/C SYSTEM TOTAL CAPACITIES PAG OIL R134a REFRIGERANT (polyalkylene glycol) 2.75 LBS.

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.

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.

CHECK A/C CONDENSER CORE

b. Check air intake filters and clean as required. c.

Check the condenser core for dirt and debris.

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

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.

195-6A

3.18

CHECK A/C CONDENSER CORE

Tigercat 718 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.

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

• TRANSMISSION OIL FILL TUBE

•

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

TRANSMISSION OIL LEVEL CHECK

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.

718-D13

CHECK TRANSMISSION OIL LEVEL

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

Procedure:

REAR CHASSIS

CHECK FOR MOVEMENT IN THIS JOINT AREA

724D-D11

FRONT CHASSIS

Drive machine for a minimum of 5 minutes to ensure that the lubrication pump is primed.

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 using the transmission oil fill tube.

Do not overfill.

1000 HOUR CHECK

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

Refer SECTION 11 of the SERVICE MANUAL for more information.

3.19

Tigercat 718 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.

3.20

Tigercat 718 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.

3.21

Tigercat 718 Feller Buncher

Lubrication and Maintenance

STARTUP PROCEDURE AFTER MAJOR MACHINE MAINTENANCE

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. (Note for earlier machines equipped with a vacuum pump the vacuum pump switch must be in the OFF position.)

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

When a constant stream of oil without any air exits each of the suction tubes replace the air bleed plugs. Do not remove pressure from the tank until both air bleed plugs are 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 pin and apply the parking brake.

5. Turn both differential lock switches to OFF. 6. Do not start engine. Purge air from hydraulic system by adding oil 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

•

718-D18

HYDRAULIC TANK 3.22

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

Tigercat 718 Feller Buncher

Lubrication and Maintenance

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

4. Reconnect wires on injector pump solenoid.

Do not start engine.

INSTALL A 0-1000 PSI GAUGE AT M3 PORT.

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

•

DRIVE PUMP

1. Ensure the articulation lock pin is installed.

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

UNPLUG ENGINE START SOLENOID

••

• •• 718-D17

718-D16

DISCONNECT ENGINE START SOLENOID (CUMMINS SHOWN)

CAUTION 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.

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.

•

DRIVE PUMP 'M3' TEST PORT CONNECTION

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

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

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

7. 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.

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 3.23

Tigercat 718 Feller Buncher

Lubrication and Maintenance

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

IMPORTANT

12. Remove pressure gauge from the pilot manifold.

•

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.

STEER CIRCUIT MAIN RELIEF 2500 PSI.

CRANK, LINK AND BOOM ARMS

•• INSTALL A 0-5000 PSI GAUGE

CRANK ARM

STEER CIRCUIT MAIN RELIEF VALVE 13. Install a 0-5000 psi gauge on steer circuit main relief (quick connect fitting).

LINK ARM

••

724D-D04

• •

14. Set steer relief to 2500 psi on gauge.

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

BOOM ARM

16. Remove 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 differential locks). If wheels have been removed, operate forward and reverse pedals very slowly to fill axles with oil.

192-21A

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

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.

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

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

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

3.24

Tigercat 718 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

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

120-132 120-132 37-49

163-179 163-179 50-66

Axle mounting bolts Front Rear

7/8" UNC 3/4" UNC

364 226

500 310

Wheel bolts

7/8" UNF

500-550

679-745

Transmission housing to frame

7/8" UNC

364

500

Center joint bearing Bearing retaining bolts Pin retaining bolts

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

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

718-TORQUE.XLS ISSUE 1 JAN02

3.25

Tigercat 718 Feller Buncher

Lubrication and Maintenance

GENERAL TORQUE SPECIFICATIONS

The torque values listed below are for general use only.

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

IMPERIAL

GRADE 5 BOLTS

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

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

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

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

METRIC

SIZE

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

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

M6 M8 M10

4.8 12 23

3.5 8.5 17

6 15 29

4.5 11 21

9 22 43

6.5 16 32

11 28 55

8.5 20 40

13 32 63

9.5 24 47

17 40 80

12 30 60

15 37 75

11.5 28 55

19 47 95

14.5 35 70

M12 M14 M16

40 63 100

29 47 73

50 80 125

37 60 92

75 120 190

55 88 140

95 150 240

70 110 175

110 175 275

80 130 200

140 225 350

105 165 225

130 205 320

95 150 240

165 260 400

120 190 300

M18 M20 M22

135 190 260

100 140 190

175 240 330

125 180 250

260 375 510

195 275 375

330 475 650

250 350 475

375 530 725

275 400 540

475 675 925

350 500 675

440 625 850

325 460 625

560 800 1075

410 580 800

M24 M27 M30

330 490 675

250 360 490

425 625 850

310 450 625

650 950 1300

475 700 950

825 1200 1650

600 875 1200

925 1350 1850

675 100 1350

1150 1700 2300

850 1250 1700

1075 1600 2150

800 1150 1600

1350 2000 2700

1000 1500 2000

M33 M36

900 1150

675 850

1150 1450

850 1075

1750 2250

1300 1650

2200 2850

1650 2100

2500 3200

1850 2350

3150 4050

2350 3000

2900 3750

2150 2750

3700 4750

2750 3500

3.26

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

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

Tigercat 718 Feller Buncher

Lubrication and Maintenance

PRESSURE SETTINGS WITH SAW

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

Pressure (PSI)

Engine RPM 2475 High Idle 800 Low Idle

Engine RPM (± 25 RPM No Load) Pilot Manifold Pressure Relief Valve Pressure Reducing Valve

675 550

1000 1000

350

1775

4800 4800 5300 Non-Adjustable 5300 Non-Adjustable

2200 2200

Drive Motor Drive Motor P.O.R.

3700

2200

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

2500 3200 3200

2200 1000 1000

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

3900 3650

1000 1000

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

2600 2900 2900 1100 3200 3200 3200 2900 2200

2200 1000 1000 1000 1000 1000 1000 1000 1000

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

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

718PRESSET-SAW.XLS ISSUE 1 JAN02

3.27

Tigercat 718 Feller Buncher

Lubrication and Maintenance

PRESSURE SETTINGS WITH SHEAR

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

Pressure (PSI)

Engine RPM 2475 High Idle 800 Low Idle

Engine RPM (± 25 RPM No Load) Pilot Manifold Pressure Relief Valve Pressure Reducing Valve

675 550

1000 1000

Drive Pump 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

4800 4800 5300 Non-Adjustable 5300 Non-Adjustable

2200 2200

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

3700 360 Non-Adjustable

2200

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

2500 3200 3200

2200 1000 1000

Shear Shear Pump P.O.R.

3500

2200

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

2600 2900 2900 3200 3200 3200 2900 2200 3700 3700

2200 1000 1000 1000 1000 1000 1000 1000 1000 1000

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

718PRESSET-SHEAR.XLS ISSUE 1 JAN02

3.28

Tigercat 718 Feller Buncher

SECTION 5 - PILOT SYSTEM MAY 2002

CONTENTS - SECTION 5 ACCUMULATOR CHARGE VALVE .................................................................. 2 EXPLODED VIEW ......................................................................................... 8 OPERATING DESCRIPTION ........................................................................ 2 REPLACE FILTER ......................................................................................... 8 SCHEMATIC .................................................................................................. 2 ACCUMULATORS ............................................................................................ 3 BRAKE ACCUMULATOR .............................................................................. 3 CHARGING ................................................................................................... 9 CHECK PRE-CHARGE PRESSURE ............................................................. 9 PILOT ACCUMULATOR ................................................................................ 3 RELEASING PRESSURE .............................................................................. 8 TESTING DEVICE ......................................................................................... 9 COMPONENTS ................................................................................................. 2 HYDRAULIC OIL HEATING PROCEDURE .................................................... 11 PILOT CIRCUIT DESCRIPTION ....................................................................... 7 PILOT CIRCUIT DIAGRAM ............................................................................... 6 PILOT MANIFOLD ............................................................................................ 5 ASSEMBLY DIAGRAM .................................................................................. 4 OPERATING DESCRIPTION ........................................................................ 5 PILOT SHUT OFF ......................................................................................... 5 PILOT PRESSURE SETTINGS ...................................................................... 10 RELEASE PILOT SYSTEM PRESSURE .......................................................... 8

Tigercat 718 Feller Buncher PILOT SYSTEM COMPONENTS

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

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

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 the pilot manifold (including solenoid valves).

DRAIN PORT ACCUM. PORT

ACCUMULATOR CHARGE VALVE

ACCUMULATOR CHARGE VALVE

MO-03

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

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.

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 TO ACCUMULATOR

RETURN

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 718 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

ACCUMULATORS

HYDRAULIC CONNECTION

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.

ACCU-1

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 718 Feller Buncher

Pilot System

PILOT MANIFOLD WITH OPTIONAL FLEXXAIRE FAN 15

SOLENOID OPERATED CONTROL VALVE(S)

TWO ADDITIONAL SOLENOID VALVES (ITEM 15) IN C6 AND C7 PORTS ARE REQUIRED WITH OPTIONAL FLEXXAIRE FAN

PRESSURE REDUCING VALVE RELIEF VALVE

PILOT OIL TO BOOM JOYSTICK (END OF BLOCK)

PLUGGED PORTS

PILOT SHUT OFF VALVE

GAUGE TEST PORT

ORIFICE ACCUMULATOR CLOSE

CREEP REAR DIFFERENTIAL LOCK

IN FROM ACCUM. CHARGE VALVE

AW119

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

PILOT MANIFOLD ASSEMBLY 5.4

SAW DRIVE FRONT DIFFERENTIAL LOCK ORIFICE ACCUMULATOR OPEN

Tigercat 718 Feller Buncher PILOT MANIFOLD

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.

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 Creep Accum. arm(s) close Accum. 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 (C2) 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, C2, C3, C4, C5, and C8. Plugs are installed in ports C6 and C7 on standard machines. A quick connect type test port fitting is installed in port P2 to attach 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.

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.

5.5

Tigercat 718 Feller Buncher

718-01

Pilot System

PILOT CIRCUIT (WITH SAW) 5.6

Tigercat 718 Feller Buncher PILOT CIRCUIT DESCRIPTION

Pilot System

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.

5.7

Tigercat 718 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. Machine to be parked on level ground with felling head lowered and oil cool. Apply parking brake and shut off engine.

Complete either steps 2A or 2B.

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.

2A. Fully apply brake foot pedal 50 times or more.

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

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

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

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

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.

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.

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

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

PRESSURE PORT STEERING PORT

SPRING

DRAIN PORT

"O" RING

ACCUMULATOR PORT

PLUG LOCKNUT

WASHER FILTER WASHER "O" RING

AU001-3

ACCUMULATOR CHARGE VALVE (EXPLODED VIEW) 5.8

SEAT POPPET

Tigercat 718 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.

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

Remove the valve guard and cap.

Screw the charging and testing device on to the gas valve.

HOSE*

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

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

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

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 observe the gauge.

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

Pilot Accumulator pre-charge - 750 psi.

Brake Accumulator pre-charge - 700 psi.

NOTE: The pre-charge pressure will vary dependant upon 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 gas valve is leaking, it should be replaced. Use only valves approved for accumulator service.

NEVER USE AN AUTOMOTIVE TYPE VALVE.

5.9

Tigercat 718 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.

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.

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

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

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

The following steps must be followed to release pressure:

RELIEF VALVE

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

AW119

5.10

PILOT MANIFOLD

Tigercat 718 Feller Buncher HYDRAULIC OIL HEATING PROCEDURE

Pilot System 5. Adjust throttle to FULL. 6. Operate clamp closed for 30 seconds, then stop for 5 seconds.

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

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 718 Feller Buncher

Pilot System

5.12

Tigercat 718 Feller Buncher

SECTION 6 - ELECTRICAL, GAUGES & ALARMS JULY 2002

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

Tigercat 718 Feller Buncher

Electrical, Gauges and Alarms

REFER TO COLOUR CODE CHART IN THIS SECTION

718-09

MACHINE SCHEMATIC DIAGRAM 17272B (REV 0, SHEET 1 OF 3) 6.2

Tigercat 718 Feller Buncher

Electrical, Gauges and Alarms

REFER TO COLOUR CODE CHART IN THIS SECTION

718-10

MACHINE SCHEMATIC DIAGRAM 17272B (REV 0, SHEET 2 OF 3) 6.3

Tigercat 718 Feller Buncher

Electrical, Gauges and Alarms

REFER TO COLOUR CODE CHART IN THIS SECTION

718-11

MACHINE SCHEMATIC DIAGRAM 17272B (REV 0, SHEET 3 OF 3)

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)

6.4

Tigercat 718 Feller Buncher

Electrical, Gauges and Alarms

724D-D46

RELAY 6 LOW HYD. OIL LEVEL

RELAY 3 START

DIODE 1 HORN TEST

DIODE 4 BULB TEST

RELAY 2 DRIVE LOCK

DIODE 2 HORN TEST

DIODE 3 BULB TEST

RELAY 1 PILOT LOCK

15509A R2

RELAY 5 SAW

RELAY 4 DRIVE ENABLE 5A 1 GAUGES 10A 2 SAFETY 10A 3 CONTROLS 10A 4 FUEL 10A 5 RADIO 15A 6 BACK HORN 15A 7 FAN/ACC.

20A 8 AUX. 10A 9 AUX. FAN 30A 10 A/C - HEATER 20A 11 LIGHTER 25A 12 F. LIGHTS 25A 13 R. LIGHTS 15A 14 HORN/DOME

FUSE, DIODE AND RELAY PANEL REMOTE START SOLENOID

REMOTE START SOLENOID

FUEL SOLENOID

•

FUEL SOLENOID

•• ••

•• 125 AMP FUSE

••

• 125 AMP FUSE

724D-D47

724D-24

START AND FUEL SOLENOIDS 6.5

Tigercat 718 Feller Buncher

Electrical, Gauges and Alarms

GROUND JUMPER

D PANEL POWER (RED) 1

2

G80 (BLK) A/C OFF G28 (BLK) GROUND

BAT

1

PANEL GROUND (BLK) G 7

G 28

(BLK) A/C GROUND

FAN PUMP REV "-" (BLK) G 81 70 (ORG) FRESH AIR BLOWER

G 59

(BLK) GAUGE & SWITCH GROUND

G 79

(BLK) FDC GROUND

G7 3

10A (ORG) A/C ON/OFF

55 (ORG) A/C & HEATER RUN LOW HYDRAULIC OIL (YEL) 53

5

6

28 (RED) A/C & HEATER FAN POWER 31 (RED) FRESH AIR BLOWER POWER

HORN (ORG) 38 FRONT LIGHTS (BRN) 58 REAR LIGHTS (BRN) 57 (2) WORK MODE (GRN) 42 ENGINE HOURS (YEL) 49 BACK-UP ALARM (RED) 47 RADIO IGNITION POWER (RED) 08 FUEL CONTROL VALVE (RED) 13B PARKING BRAKE (TAN) 11 PARKING BRAKE POWER (RED) 06 START SOLENOID RELAY (TAN) 16

(BACK) FRESH AIR BLOWER

WARNING HYD. OIL TEMP (YEL) 27 WARNING HIGH COOLANT TEMP. (YEL) 29 COMPRESSOR CLUTCH (ORG) 46A FAN PUMP FWD "+" (GRN) 88/88A

RELAY (MIDDLE) A/C AND HEATER RUN

RELAY

10

(ORG) COMPRESSOR SWITCH

15

(RED) JOYSTICK POWER

41

(PUR) TACHOMETER

33/33c (TAN) PILOT SHUT OFF/DOOR SWITCH

RADIO BAT./DOME PWR (ORG) 5A

RELAY

(BLK) PANEL GROUND

A1 B1

4

(RED) IGNITION POWER

BAT 1 (RED) FUSE BLOCK POWER

FAN PUMP FWD "-" (GRN) 91

(OIL) FDC SENSOR "-" (BLK) G96 (FRONT) HIGH SPEED VACUUM PUMP (RED) 00 FAN

87 37

36

(TAN) DRIVE PREVENT

59

(TAN) DOOR SWITCH

45

(YEL) HYDRAULIC OIL TEMP.

44

(YEL) ENGINE COOLANT TEMP.

43

(YEL) ENGINE OIL PRESSURE

40

(GRN) REAR DIFF. LOCKS

39

(GRN) FAN PURGE

35

(TAN) SAW

21

(TAN) (1) CREEP MODE

22

(YEL) WARNING ENGINE OIL PRESSURE

34

(YEL) WARNING LOW COOLANT LEVEL

17

(GRN) FAN PUMP REV "+" /PURGE (718)

20A

(GRN) FRONT DIFF. LOCKS

93

(YEL) FDC SENSOR "+" (COOLANT)

G95

(BLK) FDC SENSOR "-" (COOLANT)

94

(YEL) FDC SENSOR "+" (HYD. OIL)

(WHT) FUEL HEATER (OPTION) (WHT) ETHER (OPTION)

ELECTRICAL CONNECTIONS AND RELAYS

6.6

18625A R3

Tigercat 718 Feller Buncher

718-02

Electrical, Gauges and Alarms

INSTRUMENT PANEL WIRING DIAGRAM 2771D (REV 2) 6.7

Tigercat 718 Feller Buncher GAUGES AND ALARMS

Electrical, Gauges and Alarms

The 718 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. 1 2 3 4 5 6 7 8 9 10 11

SENSOR FUNCTION Saw circuit pressure gauge Engine hours Hydraulic oil temperature Hydraulic oil temperature Hydraulic oil level, low Engine oil pressure Engine oil pressure Engine coolant level Engine coolant temperature Engine coolant temperature Tachometer

12 13

Volts Engine air cleaner

14 15

Back-up alarm Safety alert horn

GAUGE/SENSOR RANGE LIGHT HORN

0-5000 psi 0-9999.9 100°F-240°F high/low 0-100 psi 100°F-280°F 0-3000 RPM

ON ON ON ON ON -

ON ON ON ON ON -

8v-18v Green-Red

-

-

-

-

ON ON

718-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 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 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 718 Feller Buncher SWITCH PILOT SHUT OFF LEFT CAB DOOR

Electrical, Gauges and Alarms 14 SWITCH -

BACK-UP ALARM

SWITCH PILOT SHUT OFF RIGHT CAB DOOR

4

5

LIGHTS AND 8 10 WARNING CONTROL PANEL HORN

7

SWITCH, 15 HORN SAFETY HORN FUEL SOLENOID

START SOLENOID

PARKING BRAKE PROXIMITY SENSOR

HORN, SAFETY 15

SENDER ENGINE COOLANT LEVEL FOR WARNING LIGHT/HORN

8

125 AMP FUSE

SENDER ENGINE COOLANT TEMPERATURE FOR GAUGE

SWITCH - ENGINE COOLANT TEMPERATURE FOR WARNING LIGHT/HORN

9

10

VIEW 'A'

SWITCH BATTERY DISCONNECT

BACK-UP ALARM

14

VIEW 'A'

7

SWITCH - ENGINE OIL PRESSURE FOR WARNING LIGHT/HORN

BATTERIES

6

SENDER ENGINE OIL PRESSURE FOR GAUGE

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

SENDER - HYDRAULIC OIL

3 TEMPERATURE FOR GAUGE

SENSOR & SWITCH LOCATIONS 6.9

718-03

TEMPERATURE FOR WARNING LIGHT/HORN

11 SENSOR TACHOMETER

2 SWITCH ENGINE HOURS

Tigercat 718 Feller Buncher

Electrical, Gauges and Alarms

6.10

Tigercat 718 Feller Buncher

SECTION 7 - ENGINE JULY 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 AND FUSES .................................................................................... 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 718 Feller Buncher STARTING CIRCUIT

Engine CIRCUIT DESCRIPTION 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 detailed engine information, refer to the engine manufacturer's manual.

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

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 337-19

REMOTE START SOLENOID

PARKING BRAKE "OFF" POSITION

FUEL SOLENOID

•

••

125 AMP FUSE

•• 337-20

PARKING BRAKE "ON" POSITION

724D-D47

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.

START AND FUEL SOLENOIDS

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.

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

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

Refer to START CIRCUIT DIAGRAMS in THIS SECTION. 7.2

Tigercat 718 Feller Buncher

Engine

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.

It should be noted that with the engine running, the parking brake ON and the drive enable relay energized, voltage is not available in wire 66 to the drive lock relay (2). Because of this, driving the machine is still not possible until both cab doors are closed and the pilot reset switch is pressed.

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.

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

For schematic diagrams, showing various stages of the start circuit, refer to START CIRCUIT DIAGRAMS in THIS SECTION.

197-5

CAB DOOR SWITCH

724D-D46

RELAY 6 LOW HYD. OIL LEVEL

RELAY 3 START

DIODE 1 HORN TEST

DIODE 4 BULB TEST

RELAY 2 DRIVE LOCK

DIODE 2 HORN TEST

DIODE 3 BULB TEST

RELAY 1 PILOT LOCK

15509A R2

RELAY 5 SAW

RELAY 4 DRIVE ENABLE 5A 1 GAUGES 10A 2 SAFETY 10A 3 CONTROLS 10A 4 FUEL 10A 5 RADIO 15A 6 BACK HORN 15A 7 FAN/ACC.

20A 8 AUX. 10A 9 AUX. FAN 30A 10 A/C - HEATER 20A 11 LIGHTER 25A 12 F. LIGHTS 25A 13 R. LIGHTS 15A 14 HORN/DOME

FUSE, DIODE AND RELAY PANEL 7.3

Tigercat 718 Feller Buncher

Engine

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

718-12

START CIRCUIT - START

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

718-13

7.4

Tigercat 718 Feller Buncher

Engine

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

718-14

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

718-15

7.5

Tigercat 718 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 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 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.

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 THERMOSTAT (PARTIALLY OPEN)

SURGE TANK

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 718 Feller Buncher PRECLEANER - ENGINE AIR INTAKE

Engine 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.

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

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

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

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

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

Cummins Engine = 1/2 turn.

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

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

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

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.

ONLY THE PURIFIED AIR GOES TO THE AIR FILTER

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.

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 R.P.M. (2200 rpm.) The low idle rpm. reading on the instrument panel tachometer may be slightly inaccurate.

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

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

7.7

Tigercat 718 Feller Buncher

Engine

7.8

Tigercat 718 Feller Buncher

SECTION 8 - DRIVE JULY 2002

CONTENTS - SECTION 8 AXLES .......................................................................................................... 8.22 AXLE LUBRICATION ................................................................................ 8.24 BRAKE BLEEDING ................................................................................... 8.23 BRAKE LINING INSPECTION (REAR AXLE ONLY) ................................ 8.23 FILLING AXLES, ALTERNATIVE METHOD ............................................. 8.25 FILLING THE AXLES ................................................................................ 8.24 REAR AXLE OSCILLATION SHIM ........................................................... 8.26 SERVICE BRAKES (REAR AXLE ONLY) ................................................. 8.23 CIRCUIT DESCRIPTION ............................................................................... 8.2 CIRCUIT DIAGRAM ....................................................................................... 8.9 DRIVE PREVENT VALVE .............................................................................. 8.8 DRIVE PUMP, SUNDSTRAND ...................................................................... 8.3 DRIVE SHAFT, FRONT, INSTALLATION .................................................... 8.20 FOOT CONTROL VALVE .............................................................................. 8.8 HYDRAULIC SYSTEM - CLOSED LOOP ...................................................... 8.2 HYDROSTATIC DRIVE MOTOR DESCRIPTION ........................................................................................... 8.6 SCHEMATIC ............................................................................................... 8.7 "X" DIMENSION ........................................................................................ 8.17 PRESSURE SETTINGS DRIVE PUMP ........................................................................................... 8.12 PRESSURE SETTINGS AND ADJUSTMENTS ADJUSTING PUMP POR. VALVE ............................................................ 8.12 TEST DRIVE ................................................................................................ 8.10 PARKING BRAKE ADJUSTMENT, CHECKING FOR .............................. 8.11 SAW MOTOR BEGIN OF DISPLACEMENT REGULATION .................... 8.11 TRANSMISSION .......................................................................................... 8.18 SHIFT LEVER ........................................................................................... 8.19 WHEEL INSTALLATION .............................................................................. 8.25

Tigercat 718 Feller Buncher PISTON SLIPPERS

Drive

SWASHPLATE, AXIAL PISTON PUMP

LOW PRESSURE RETURN FROM DIESEL ENGINE

TILTABLE SWASHPLATE

BENT AXIS PISTON MOTOR HIGH PRESSURE SUPPLY

TO VEHICLE DRIVE 720B27

CONTINUOUS CLOSED LOOP HYDRAULIC CIRCUIT 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 DRIVE SYSTEM The primary components of a hydrostatic drive system are a hydraulic pump and a hydraulic motor connected together by two hydrostatic hoses. The pump converts the mechanical power of the diesel engine into hydraulic power.

This high pressure flow of hydraulic oil is then transmitted to the hydraulic motor through the first connecting hose. The motor then reconverts the hydraulic power back into the mechanical power used to propel the machine. Low pressure hydraulic oil flow then returns from the motor to the pump through the other connecting hose thereby completing a continuous closed loop hydraulic circuit.

Hydrostatic drives are used because they offer enhanced operator control of vehicle speed and tractive effort. As well hydrostatic drive systems give flexibility in the positioning of components within the machine when compared to mechanical drive systems.

A hydraulic system is termed closed loop when the hydraulic oil returning from the motor is fed straight back to the pump without first returning to tank. When the machine is travelling forward, one side of the closed loop is a high pressure supply while the other side is a low pressure 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 718 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 718 Feller Buncher SAUER DRIVE PUMP

Drive 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 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 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. 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

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 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

••

TO CHARGE PRESSURE FILTER

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

•

•

•

'A' POR VALVE ADJUSTING SCREW 5 MM ALLEN KEY 19 MM WRENCH

'B' POR VALVE ADJUSTING SCREW 5 MM ALLEN KEY 19 MM WRENCH

••

••

TO CREEP VALVE

•

• •

•• ••

••

SUCTION FROM TANK

PRESSURE PORT 'B'

PRESSURE PORT 'A' GAUGE TEST PORT 'M1' PORT SIZE - 06 JIC 718-D24

••

• CHARGE PUMP

DRIVE PUMP - SAUER 8.3

CHARGE PRESS. RELIEF 1 1/16" WRENCH 1/2" SOC. WRENCH GAUGE TEST PORT 'M2' PORT SIZE - 06 JIC

Tigercat 718 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

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.

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

PRESSURE LIMITER BYPASS ADJUSTING SCREW ACTUATOR 724D-26

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

PRESSURE LIMITER POPPET SEAT

CROSS SECTION OF POR (MULTI-FUNCTION VALVE)

OPERATING DESCRIPTION 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.

devices in the event that the POR valve malfunctions or does not respond quickly enough to high pressure surges.

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

8.4

Tigercat 718 Feller Buncher

Drive

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 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°).

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.

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 motor, 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 makeup oil acts as a cooling fluid for the piston pump and motor to ensure peak hydrostatic 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'

GAUGE TEST PORT 'B'

TO MOTORS

AP105-2

HIGH PRESSURE RELIEFS 'A' AND 'B'

SWASH PLATE CONTROL VALVE

CHARGE PUMP RELIEF CHARGE PUMP

P.O.R VALVES 'A' AND 'B'

CONTROL CYLINDER

DRIVE PUMP SCHEMATIC (SAUER) 8.5

Tigercat 718 Feller Buncher HYDROSTATIC DRIVE MOTOR

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

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

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

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

The piston motor is made variable by changing the angle of the motor rotating group cylinder housing relative to the end of the output shaft.

This angle determines the size or displacement of the motor. The displacement determines the output speed and torque of the motor. Increasing the displacement, increases the torque output while reducing the output speed of the motor.

Reducing the displacement reduces the torque and increases the speed.

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

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

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.

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

8.6

Tigercat 718 Feller Buncher

Drive

FLUSHING VALVE MOTOR POR VALVE

CONTROL CYLINDER

FROM "CREEP" SOLENOID VALVE (PILOT MANIFOLD)

FROM PUMP (B)

FROM PUMP (A)

DRIVE MOTOR SCHEMATIC

AQ2SC

MINIMUM DISPLACEMENT ADJUSTING SCREW

FLUSHING VALVE 'X'

M1

'X'

A

B

DRIVE SHAFT ROTATING GROUP

'A' MAXIMUM DISPLACEMENT ADJUSTING SCREW (NO ADJUSTMENT REQUIRED)

VIEW 'A'

(MOTOR POR) ADJUSTING SCREW

AQ012-F

X

G

DRIVE MOTOR 160CC

8.7

AQ012-G

Tigercat 718 Feller Buncher DRIVE FOOT CONTROL VALVE

Drive DRIVE PREVENT VALVE

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

CONNECTOR

SOLENOID

SPOOL SECTION VALVE BLOCK

PORT 1

PORT 2 V-04

DRIVE PREVENT VALVE

This solenoid operated spool valve prevents the machine from being driven either forward or in reverse when the parking brake is ON. OPERATING DESCRIPTION RR-13

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

DRIVE PILOT VALVE

FOOT VALVE OPERATING DESCRIPTION In the neutral position the foot pedal (1) is held centered by the return spring (4). When the pedal (1) is operated, the plunger (5) is pushed against the return spring (4). At the same time the regulating spool (2) is moved through the regulating spring (3).

5

4

2

3

8 'p' port AU013-1

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

1

WORK PORTS 1 OR 2

SPOOL ARRANGEMENT

AU013-2

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

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

8.8

Tigercat 718 Feller Buncher

718-04

Drive

DRIVE CIRCUIT 8.9

Tigercat 718 Feller Buncher TEST DRIVE

Drive CREEP FUNCTION

Note: This procedure is for a Sauer-Danfoss pump and Rexroth motor installation.

1. Shift transmission to LOW RANGE, turn the creep switch ON, set throttle to FULL, drive machine FORWARD at FULL SPEED. The machine should now move at a much slower speed (approximately 1/4 of previous).

Gauge at motor 'M1' port should read ZERO (0 psi.).

This test drive will verify the following: 1. Drive motor pressure override.

2. Creep function.

3. Transmisssion low and high ranges.

5. Front and rear differential lock functions.

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

5. Saw Recovery Time.

TRANSMISSION LOW AND HIGH RANGES:

6. Parking brake operation.

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

4. Engine Horsepower Audit

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

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

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

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

Fasten your seat belt and move the machine to a suitable test area, where it can be safely driven at full speed for approximately 150 feet.

4. Operate the machine at FULL throttle and FULL forward drive pedal. Speed should be half of the high range speed.

IMPORTANT: Shifting gears while machine is moving will result in transmission damage.

Shift gears only when machine is stationary.

Slight movement of the steering joystick may be used to aid shifting. Do not press drive pedals to 'nudge' machine when shifting.

ENGINE HORSEPOWER AUDIT: 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:

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.

Cummins 6BTA5.9 engine: 2450-2500 RPM 3a. Leave the THROTTLE control set to FULL. 3b Turn A/C switch OFF and set FAN speed to FULL ON (OVERRIDE).

DRIVE MOTOR PRESSURE OVERRIDE CONTROL PRESSURE:

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

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

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

4. While doing the above, carefully drive the machine FORWARD and apply the foot brake to develop a reading of 3700 psi pressure at M1.

2. Drive the machine FORWARD at FULL SPEED. Apply the foot brake to slow the machine. The pressure at 'Ma' on the drive pump will begin to rise.

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

3. When the 'Ma' gauge on the DRIVE PUMP reads 3700 psi., the pressure at the 'M1' gauge on the DRIVE MOTOR should rise to 2000 - 2600 psi., pause for a moment, then spike to over 3000 psi.

Cummins 6BTA5.9 Engine: 1974-2126 RPM Note: This test may have to be done a few times to get a proper reading.

Note: If these results cannot be obtained, refer to DRIVE MOTOR PRESSURE SETTINGS AND ADJUSTMENTS in THIS SECTION. 8.10

Tigercat 718 Feller Buncher

Drive CHECKING FOR PROPER PARKING BRAKE ADJUSTMENT

DIFFERENTIAL LOCKS: 1. Bring machine to a full stop, set throttle to IDLE, ensure both front and rear differential lock switches are turned OFF. Steer machine without depressing drive pedal.

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.

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

SAW MOTOR POR CONTROL PRESSURE, Tigercat Saws: 1. Install saw guard and raise felling head 6 inches off ground.

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.

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

8.11

Tigercat 718 Feller Buncher DRIVE PUMP PRESSURE SETTINGS AND ADJUSTMENTS

Drive WARNING

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

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.

19 mm Wrench 10 mm Wrench 5 mm Allen key 3 mm Allen key 1. Park machine on level ground, lower felling head to the ground.

2. Ensure hydraulic oil is at operating temperature. Refer to HYDRAULIC OIL HEATING PROCEDURE in SECTION 5 of THIS MANUAL.

11. With the aid of an assistant, hold down the brake pedal and while depressing the FORWARD foot pedal, set the pump POR valve 'A' to 4800 psi, gauge at 'M1'.

3. Set parking brake ON. 4. Put machine in HIGH GEAR.

WARNING

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

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

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 pressure value and counterclockwise to decrease.

After adjustment hold adjusting screw in place and tighten locknut.

5. Install articulation lock bar and stop engine.

WARNING

BYPASS ACTUATOR

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.

5 MM ALLEN KEY ON ADJUSTING SCREW

•• ••

6. On the drive pump connect the following gauges:

19MM WRENCH ON LOCKNUT

0-10000 psi to ports 'M1' and 'M2' 0-1000 psi to the "capped" test port at the TEE connection from port 'M3'

724D-27

ADJUSTING PUMP POR VALVE

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

7. Start the engine and set throttle to 1775 rpm.

8. Set pump charge pressure to 350 psi (M3).

9. Set engine throttle control to FULL. 10. Depress the BRAKE pedal and set the parking brake in the OFF position. Ensure that the CREEP switch is in the OFF position.

(NOTE: The hydrostatic drive system will not operate if the parking brake is not FULLY OFF.)

PRESSURE LIMITER BYPASS ADJUSTING SCREW ACTUATOR 724D-26

8.12

PRESSURE LIMITER POPPET SEAT

CROSS SECTION OF POR (MULTI-FUNCTION VALVE)

Tigercat 718 Feller Buncher

Drive

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

12. With the aid of an assistant, hold down the brake pedal and while depressing the REVERSE foot pedal, set the pump POR valve 'B' to 4800 psi, gauge at 'M2'.

NOTE: The machine should not be able to move while in HIGH gear with the brake pedal depressed Refer to previous step for adjustment procedure.

13. Set the parking brake ON and shut off the engine.

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

••

TO CHARGE PRESSURE FILTER

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

•

•

•

'A' POR VALVE ADJUSTING SCREW 5 MM ALLEN KEY 19 MM WRENCH

'B' POR VALVE ADJUSTING SCREW 5 MM ALLEN KEY 19 MM WRENCH

••

••

TO CREEP VALVE

•

• •

•• ••

••

SUCTION FROM TANK

PRESSURE PORT 'B'

PRESSURE PORT 'A' GAUGE TEST PORT 'M1' PORT SIZE - 06 JIC 718-D24

••

• CHARGE PUMP

DRIVE PUMP - SAUER 8.13

CHARGE PRESS. RELIEF 1 1/16" WRENCH 1/2" SOC. WRENCH GAUGE TEST PORT 'M2' PORT SIZE - 06 JIC

Tigercat 718 Feller Buncher DRIVE MOTOR PRESSURE SETTINGS AND ADJUSTMENTS MOTOR POR

Drive 4. Put machine in HIGH GEAR. 5. Install articulation lock bar and stop engine.

6. On the drive pump connect the following gauges:

TOOLS REQUIRED:

1 1/4" Wrench 1 1/16" Wrench 1/2" Soc. Wrench

19 mm Wrench 10 mm Wrench 5 mm Allen key 3 mm Allen key 1. Park machine on level ground, lower felling head to the ground.

0-10000 psi to pump ports 'M1' and 'M2' 0-1000 psi to the "capped" test port at the TEE connection from pump port 'M3' 0-5000 psi to motor port 'M1'

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

2. Ensure hydraulic oil is at operating temperature. Refer to HYDRAULIC OIL HEATING PROCEDURE in SECTION 5 of THIS MANUAL.

7. Start the engine and set throttle to 1775 rpm.

8. Set pump charge pressure to 350 psi (M3).

9. Set engine throttle control to FULL.

WARNING

10. Depress the BRAKE pedal and set the parking brake in the OFF position. Ensure that the CREEP switch is in the OFF position.

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

(NOTE: The hydrostatic drive system will not operate if the parking brake is not FULLY OFF.)

3. Set parking brake ON.

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

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.

'X'

MINIMUM DISPLACEMENT ADJUSTING SCREW

M1

A

'A'

G

(MOTOR POR) ADJUSTING SCREW AQ012-F

B

DRIVE MOTOR 160CC 8.14

X

VIEW 'A'

AQ012-G

Tigercat 718 Feller Buncher

Drive

11. It is neccessary to temporarily adjust the FORWARD pump POR.

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

With the aid of an assistant, hold down the brake pedal and while depressing the FORWARD foot pedal, set the pump POR valve 'A' to 3000 psi, gauge at 'M1'.

15. Reset the FORWARD pump POR.

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

With the aid of an assistant, hold down the brake pedal and while depressing the FORWARD foot pedal, set the pump POR valve 'A' to 4800 psi, gauge at 'M1'.

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 pressure value and counterclockwise to decrease.

After adjustment hold adjusting screw in place and tighten locknut.

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

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 pressure value and counterclockwise to decrease.

After adjustment hold adjusting screw in place and tighten locknut.

12. Set engine throttle to IDLE. 13. With the aid of an assistant, hold down the brake pedal and while depressing the FORWARD foot pedal Slowly turn the pump P.O.R. screw IN to increase the system pressure and watch for the point where the pressure at 'M1' (on motor) increases from zero to 2000 -2600 psi. and then rapidly spikes to over 3000 psi.

16. Set the parking brake ON, and shut off the engine.

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

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

If the pressure at motor 'M1' spikes to over 3000 psi. before the pump 'M1' gauge reaches 3700 psi., the motor POR adjusting screw must be backed OUT. If the spike at motor 'M1' occurs after the pump 'M1' gauge passes 3700 psi., the motor POR adjusting screw must be turned IN. NOTE: This is a sensitive adjustment. Large changes in the gauge reading will be noticed with only a small movement of the adjusting screw. Pressure will change by 500 psi. by turning the screw only 1/8 of a turn.

8.15

Tigercat 718 Feller Buncher MOTOR MINIMUM DISPLACEMENT

Drive

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.

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.

NOTE: Ensure hydraulic oil is at operating temperature. Refer to HYDRAULIC OIL HEATING PROCEDURE in THIS SECTION of the manual.

IMPORTANT

1. Park the machine on level ground, lower felling head to the ground and set parking brake ON. Install articulation lock bar an shut off engine.

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

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

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

2. Remove the minimum displacement adjusting screw (largest screw) from the top of motor housing and measure its length.

3. Reinstall the minimum displacement adjusting screw and locknut into the motor housing. For a 100mm long screw, it should be adjusted such that the dimension from the top of the locknut to the end of the exposed screw is 25mm. (For different length screws, measure the length and subtract 75mm from this total length. This is the amount of screw that should be exposed above the locknut.)

(For example: 90mm screw, minus 75mm will leave 15mm above locknut).

"X"

MIN. DISPLACEMENT "X" DIMENSION

DIM X

'X'

MINIMUM DISPLACEMENT ADJUSTING SCREW

M1

A

'A'

G

(MOTOR POR) ADJUSTING SCREW AQ012-F

B

DRIVE MOTOR 160CC

8.16

X

VIEW 'A'

AQ012-G

Tigercat 718 Feller Buncher

Drive

8.17

Tigercat 718 Feller Buncher

Drive

TRANSMISSION

OPERATION

This machine has a two speed manual shift transmission. The transmission drives both the front and rear axles of the machine. Power is supplied by the hydrostatic drive motor mounted to the input side of the transmission. The output shaft transmits power to both the front and rear axles.

Pulling up or pushing down the gearshift lever inside the cab moves the shift lever (1) on the transmission, which moves the shift collar (2), to connect either the LOW gear (3) or the HIGH gear (4) to the output shaft (5).

Detent balls (6) between the collar and output shaft provide positive feel for the selected range.

This results in either low speed operation , or high speed operation. The mid position is neutral.

A lubrication pump (7) mounted on the front of the transmission and driven off the end of the input shaft (8) provides oil to lubricate the gears and bearings and also the splines of the hydrostatic drive motor. Oil is channelled to these areas via a passageway and a series of crossed drilled holes in the input shaft. Additional lubrication is provided by escaping oil from the input shaft and also oil splashed up on to the gears from the sump in the bottom of the transmission. The oil level in the gearbox must be up to the level marked on the dipstick. For the recommended lubricant refer to SECTION 3 of THIS MANUAL.

NOTE: Shift gears only when the machine is stationary and on level ground. Slight movement of the steering joystick may be required to facilitate shifting from one gear to the next.

The transmission must be in neutral for machine to be towed by another vehicle. For more information on towing, refer to TOWING INSTRUCTIONS in SECTION 2 of the OPERATOR'S MANUAL. INPUT SHAFT (8)

INPUT SHAFT (8) LUBRICATION PUMP (7)

FROM MOTOR

FROM MOTOR

SHIFT COLLAR (2)

SHIFT COLLAR (2)

SHIFT LEVER (1)

SHIFT LEVER (1)

REAR AXLE

LUBRICATION PUMP (7)

DETENT BALLS (6)

FRONT AXLE

OUTPUT SHAFT (5)

REAR AXLE

FRONT AXLE

OUTPUT SHAFT (5)

LOW GEAR (3)

HIGH GEAR (4)

LOW GEAR (3)

HIGH GEAR (4)

HIGH SPEED OPERATION

LOW SPEED OPERATION TRANSMISSION 720B15

8.18

Tigercat 718 Feller Buncher TRANSMISSION SHIFT LEVER

Drive 8

LEVER ADJUSTMENT The transmission gear shift lever is located at the right side, behind the seat. Lever UP is HIGH speed, NEUTRAL in the center and DOWN is LOW speed. If required, these positions can be adjusted at the transmission end of the cable.

•

To shorten or lengthen the cable, remove the cotter pin and the clevis pin and loosen the jam nut, screw the clevis on or off the cable to change the cable length. Tighten the jam nut, replace the clevis pin and cotter pin. The outer cable can be adjusted by adjusting the two jam nuts holding it in the support bracket.

229-20

GEAR SHIFT LEVER

SHIFT LEVER CLEVIS

COTTER PIN

JAM NUTS

CLEVIS PIN

TRANSMISSION CABLE

SHIFT CABLE ADJUSTMENT 720B23

8.19

Tigercat 718 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. 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.

9. 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.

PILLOW BLOCK BEARING INSTALLATION ONTO FRONT DRIVE SHAFT: 1. Remove the yoke retaining nut and the yoke from the front drive shaft. DO NOT clamp the TUBULAR portion of the drive shaft in a vice during any of the assembly process.

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.

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.

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.

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

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

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

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

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

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

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.

NOTE: DO NOT use a power greaser.

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

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

Tigercat 718 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

TRANSMISSION FRONT OUTPUT YOKE

SLIP SPLINE

RELIEF FITTING

REAR AXLE

REAR DRIVE SHAFT

SLIP SPLINE SEAL

724D-01

DRIVE SHAFT INSTALLATION 8.21

GREASE FITTING

Tigercat 718 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 3

2

4

PIVOT LUBRICATION POINT

REAR AXLE

27KSM

6

AXLE HYDRAULIC CONNECTIONS

7

5 AXL-3

AXLE ASSEMBLY CROSS SECTION (REAR SHOWN) 8.22

Tigercat 718 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) 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.

SINGLE BRAKE LINE ACTUATES BOTH BRAKES IN REAR AXLE

BLEED SCREWS

SINGLE BRAKE PEDAL

BRAKE DISC BACKING PLATE

REAR AXLE ASSEMBLY

AXL-BRK1

ANNULAR PISTON

DUAL BRAKES (REAR AXLE)

PROCEDURE 1. Place parking brake ON.

AXL-BRK

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

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 718 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.

720D-D04

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

REAR AXLE (LEFT SIDE OF MACHINE)

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.

FRONT AXLE

8.24

Tigercat 718 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.

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

1. Ensure the articulation lock pin is installed.

2.17"

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

MIN. FULL THREAD

3. Turn both differential locks ON and run engine at IDLE for 30 minutes, this procedure will fill the axles with hydraulic oil and purge the air from them at the same time. (axles fill with controlled leakage from diff. locks). If wheels have been removed, operate forward and reverse pedals very slowly to fill axles with oil.

.79" .406" DRILL

.06" X 45° 7/8" - 14 UNF THREAD

20°

2.64" 3.41"

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

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.

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

6. With cylinders fully retracted, top up the hydraulic oil reservoir with clean hydraulic oil.

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.

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.

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.

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 718 Feller Buncher

Drive

REAR AXLE OSCILLATION SHIM CHECK AND ADJUSTMENT

3.

Set a dial indicator against the input pinion shaft on the input end of the axle.

1. The axle must be securely bolted to the chassis through the axle supports (front and back). Torque all axle mounting bolts. Refer to TORQUE CHART in SECTION 3 of THIS MANUAL. 2. Temporarily disconnect the two grease hoses from the axle pivot to prevent grease pressure from affecting the set-up. Plug hose ends to avoid contamination.

DISCONNECT REAR PIVOT GREASE HOSE

AXLE-05

SET DIAL INDICATOR

4. Using a long pry bar between the chassis and the axle housing pry the axle backward. It may be necessary to tip the axle from side to side to position the axle fully back for a proper reading.

••

AXLE-13

••

AXLE-06

USE LONG PRY BAR

AXLE-07

BETWEEN CHASSIS AND AXLE HOUSING

DISCONNECT FRONT PIVOT GREASE HOSE

724D-D31

8.26

Tigercat 718 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

THRUST WASHER

••

5. Zero the dial indicator.

6. Using a long pry bar between the chassis and the axle housing pry the axle forward. It may be necessary to tip the axle from side to side to position the axle fully forward for a proper reading.

AXLE-16

THRUST WASHER AND SHIMS

11. If the measurement was below .004 ADD shims to get the required range. A 0.010 shim will change the reading by 0.010 . Stock shims are 0.010 and 0.040 thick.

7. Read the dial indicator. Axle movement should be .004 to .014 . Check the reading twice by repeating steps 4 through 7.

12. If the measurement was above .014 REMOVE SHIMS to correct the reading. A 0.010 shim will change the reading by 0.010 . Stock shims are 0.010 and 0.040 thick.

8. If the reading is within the required range go to step 16.

9. If the reading is not within the required range follow steps 10 through 15 to adjust.

13. Replace the thrust washer.

14. Replace the center pivot front cover plate.

Make sure that the thrust washer and shims do not slide out of place and become damaged.

Torque cover bolts (6) to 80 lbf-ft.

15. Repeat steps 4 to 7 to check the adjustment again. This reading should be checked twice.

16. Reinstall cover plate and grease hoses in the axle pivot, add grease until back pressure is felt.

8.27

Tigercat 718 Feller Buncher

Drive

8.28

Tigercat 718 Feller Buncher

SECTION 9 -BRAKES AND DIFFERENTIAL LOCKS MAY 2002

CONTENTS - SECTION 9 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 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 718 Feller Buncher BRAKE COMPONENTS

Brakes and Differential Locks BRAKE ACCUMULATOR

For information on bleeding lines, inspecting brake linings and integral parts of the disc brakes, refer to SECTION 8 of THIS MANUAL. To release hydraulic pressure in the brake system, refer to RELEASE PILOT SYSTEM PRESSURE in SECTION 5 of THIS MANUAL. BRAKE PEDAL

The accumulator is installed to ensure that the brake control remains responsive at all times by maintaining a constant pressure of 1800 psi to the brake foot control valve. The brake accumulator holds sufficient pressure for up to five (5) brake applications after the engine stalls or is shut down. Beyond this, the pressure drops substantially.

For further information about the brake accumulator refer to BRAKE ACCUMULATOR in SECTION 5 of THIS MANUAL.

CIRCUIT DESCRIPTIONS BRAKES CIRCUIT 213-20

A fixed displacement pump supplies oil to the accumulator charge valve. This valve directs oil to the brake accumulator through a check valve located between the two accumulators. The brake accumulator comes precharged to 700 psi.

No pressure adjustments are required for the brake accumulator charge valve.

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 is provided to the brakes in the rear axle from the accumulator.

A reaction piston in the valve senses this increase in brake pressure and relays feedback to the operator, ie. as brake pressure increases the pedal effort increases proportionately.

For further information on brake accumulator and accumulator charge valve operation, refer to SECTION 5 of THIS MANUAL. DIFFERENTIAL LOCKS CIRCUIT 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.

A positive stop in the brake valve limits the brake pressure to a preset value. This preset value is determined by the requirement of the brakes in the rear axle, which in this case is 1000 psi. The brake pedal therefore regulates the pressure in the brake lines to 1000 psi. maximum.

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

T A P

MO-02 MO-01

CROSS SECTION OF VALVE BODY

BRAKE FOOT CONTROL VALVE

9.2

Tigercat 718 Feller Buncher

718-05

Brakes and Differential Locks

BRAKE AND DIFFERENTIAL LOCK CIRCUITS 9.3

Tigercat 718 Feller Buncher PARKING BRAKE

Brakes and Differential Locks BRAKE CABLE

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.

••

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 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.

PROXIMITY SENSOR

PARKING BRAKE LEVER

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.

••

••

METAL BAR

337-21

9.4

••

PARKING BRAKE PROXIMITY SENSOR

Tigercat 718 Feller Buncher

Brakes and Differential Locks 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.

CHECKING FOR PROPER PARKING BRAKE CABLE ADJUSTMENT 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 1/4" 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".

CLEVIS

NUT (3)

COTTER PIN

CLEVIS PIN

BRAKE CABLE

WASHER (2)

SPRING

CALIPER ASSEMBLY

ADJ. NUTS

ADJUSTING KNOB

PARKBRK5

LOCKING SET SCREW

DISC

TRANSMISSION

720C-PB5

PARKING BRAKE LEVER

CLEVIS

METAL BAR

LEVER

PARKING BRAKE ASSEMBLY 9.5

PROXIMITY SENSOR 724D-26

Tigercat 718 Feller Buncher

Brakes and Differential Locks

REAR CALIPER TORQUE PLATE CARRIER AND LINING ASSEMBLY

CALIPER MOUNTING BOLTS (2) INNER SEAL (RUBBER)

STAINLESS WASHER HARDENED WASHER

OUTER ADJUSTING NUT 720C-PB4

INNER CAM RETAINER OUTER CAM

SPRING SLEEVE SEAL (2)

SLEEVES (2)

RUBBER BOOT THRUST WASHER

BALL BEARINGS (3)

CENTER ADJUSTING BOLT

CALIPER MOUNTING NUTS (2)

LEVER

INNER ADJUSTING NUT

BRAKE CALIPER ASSEMBLY

9.6

FRONT CALIPER TORQUE PLATE

Tigercat 718 Feller Buncher

Brakes and Differential Locks

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

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.

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.

CALIPER "FLOAT"

REAR TORQUE PLATE

FRONT TORQUE PLATE

CALIPER MOUNTING BOLTS LEVER INNER ADJ. NUT OUTER ADJ. NUT

PARKBRK3

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.

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.

5. Install new carrier and lining assemblies into each caliper torque plate.

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

MOUNTING BRKT.

MOUNTING SLEEVES

2. Collapse the lining retraction spring (sheet metal spring) and remove it from assembly.

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.

5. Tighten outer locknut against inner adjustment nut to hold this lining clearance adjustment in place (45 to 55 lbf-ft).

CALIPER MOUNTING NUTS

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.

BRAKE CALIPER

9.7

Tigercat 718 Feller Buncher

Brakes and Differential Locks

9.8

Tigercat 718 Feller Buncher

SECTION 10 - OIL COOLER JULY 2002

CONTENTS - SECTION 10 CLEANING ........................................................... See OPERATOR'S MANUAL FLEXXAIRE® FAN MAINTENANCE (OPTIONAL ITEM) ..................................6 BLADE LOCK-OUT PROCEDURE .............................................................. 10 CHECKING HUB OIL ...................................................................................12 CIRCUIT DIAGRAM ....................................................................................... 9 FAN OVERVIEW ...........................................................................................8 HUB OIL CAPACITY (APPROXIMATE) ....................................................... 12 LUBRICATION AND SERVICE INTERVALS ............................................... 11 MAINTENANCE CHECKLIST ...................................................................... 13 REMOVE DEBRIS USING CLEAN FUNCTION ............................................ 8 SAFETY .........................................................................................................6 HYDRAULIC OIL TANK .................................................................................... 2 OIL COOLER CIRCUIT DESCRIPTION ............................................................................... 2 CIRCUIT DIAGRAM ....................................................................................... 3 OIL COOLER OPERATION .............................................................................. 2 VACUUM PUMP, HYDRAULIC OIL TANK ........................................................ 4

Tigercat 718 Feller Buncher

Oil Cooler

OIL COOLER

OIL COOLER CIRCUIT DESCRIPTION

The hydraulic oil cooler and engine radiator are mounted side by side in front of the engine. The oil cooler is on the left side. The A/C condenser core is mounted in front of these two units and on hinges to facilitate cleaning. A debris screen, at the very front, is used to protect the complete cooling assembly.

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.

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

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

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 event that the boom valve drain line (routed through the center joint area) is damaged.

Refer to SECTION 7 of THIS MANUAL for information on the ENGINE COOLING SYSTEM. For detailed cleaning procedures, refer to CLEANING A/C CONDENSER, OIL COOLER AND RADIATOR in SECTION 2 of the OPERATOR S MANUAL.

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.

RADIATOR AND OIL COOLER ASSEMBLY

A check valve preset to 5 psi will ensure that the pressure in the tank does not rise beyond that point.

A/C CONDENSER CORE

RETURN FILTER (DUAL HEAD)

HYDRAULIC TANK

PILOT RETURN FILTER

TRAVEL/ RETURN FILTER (BLUE)

BOOM/STEER PUMP DEBRIS SCREEN

195-5A

718-

OIL COOLER AND RADIATOR ASSEMBLY

10.2

PUMPS

DRIVE PUMP

SAW PUMP

Tigercat 718 Feller Buncher

Oil Cooler

(OPTIONAL)

(OPTIONAL) (OPTIONAL)

724D-06

OIL COOLER CIRCUIT (WITH SAW ATTACHMENT) 10.3

Tigercat 718 Feller Buncher HYDRAULIC OIL HAND FILL PUMP

Oil Cooler

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.

FILL HOSE VIA RETURN FILTERS

• SUCTION TUBE

••

OIL FILL SHUT OFF VALVE

•

HAND FILL PUMP

718-D5

•

HAND FILL PUMP

10.4

Tigercat 718 Feller Buncher VACUUM PUMP (EARLIER MACHINES/OPTIONAL)

Oil Cooler

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.

With the KEY SWITCH turned OFF, turning the vacuum switch to the ON position energizes the vacuum pump and the tank vacuum valve solenoid 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 the tank to atmosphere via a 0.5 psi vent fitting.

CHECK VALVE 5 PSI.

HYDRAULIC TANK

BREATHER/ FILTER 10 PSI.

VACUUM PUMP

• •• ••

••

•

SUCTION LINE FROM TANK TANK VACUUM VALVE 724D-D44

VIEW WITH TOP REAR ENGINE ENCLOSURE PANEL REMOVED

HYDRAULIC TANK VACUUM & PRESSURIZATION COMPONENTS

10.5

Tigercat 718 Feller Buncher MAINTENANCE OF FLEXXAIRE® FAN (NOTE THAT THIS FAN IS OPTIONAL)

Oil Cooler A. If possible, make all repairs to the fan assembly on an engine stand or any other suitable stand. Do not attempt to work on the fan assembly if not safely supported or mounted.

The following information is an excerpt from the manufacturer s manual. For further information about the Flexxaire® fan please refer to the manufacturer s installation and maintenance manual.

B. If repair is to be done to the internal fan components, drain oil from the hub prior to removing any components.

SAFETY In addition to the safety information presented here, please refer to all the safety instructions outlined in the SECTION 1 of THIS MANUAL prior to working on the Flexxaire® Fan Assembly.

WARNING

C.

Always use the required tools and be sure you understand how to use them before performing any service work. Keep tools in good condition and replace if necessary.

D. Replace all fasteners with the same part number. Do not use a lesser quality fastener if replacements are necessary.

E. Do not attempt to weld any components on the fan assembly without first contacting Flexxaire® Engineering or one of their approved dealers.

Please refer to all safety information supplied, prior to doing any work on the Flexxaire® Fan Assembly.

Improper operation, maintenance or repair of this product can be dangerous and could result in injury or death.

Do not operate or perform any lubrication, maintenance or repair on this product, until you have read and understood the operation, lubrication, maintenance and repair information.

The person(s) servicing the product may be unfamiliar with many of the systems or components on the product. This makes it important to use caution when performing any type of service work. A knowledge of the product and/or its components is important before the removal or disassembly of any component.

F.

Do not damage wiring harnesses during removal operations. Secure the wiring harnesses so they are not contacting sharp corners, hot surfaces, or rubbing against objects. Do not connect wires to lines containing fluid for the possibility of exploding.

G. If a guard or shield must be removed to perform repair work, use extra caution. Repair any loose or damaged fluid lines, tubes or hoses because leaks can cause fires.

WARNING

WARNING Because of the size of the product and/or its components, the service person(s) should use proper lifting procedures when removing the product and/or any of its components.

Use a hoist when lifting the assembly or any of its components that approximately weigh 23 kg (50 lb.) or more, to avoid back injury.

Make sure all chains, hooks, slings, etc., are in good condition and are in the correct capacity. Be sure hooks are positioned correctly. Lifting eyes are not to be side loaded during any lifting operation.

Never use your 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.

10.6

Tigercat 718 Feller Buncher

Oil Cooler

H. Tighten fasteners to the correct torque. Make sure all heat shields, clamps and guards are installed correctly to avoid excessive heat, vibration or rubbing against other parts during operation. Shields that protect against oil spray onto hot exhaust in an event of a line, tube or seal failure must be installed correctly.

I.

Do not operate a machine if any rotating part is damaged or contacts any other part during operation. Any high speed rotating component that has been damaged or altered should be checked for balance before reusing. Make sure all guards and shields are properly installed and functioning correctly, before starting the engine or operating the machine.

10.7

Tigercat 718 Feller Buncher

Oil Cooler

FAN OVERVIEW

REMOVE DEBRIS DURING OPERATION USING THE CLEAN FUNCTION

The Flexxaire F/X fan systems are designed to minimize overheating caused by debris plugging radiators, screens and guards, and can be used to reduce over cooling due to low ambient temperatures. The fan blades of the Flexxaire® fan vary pitch, not fan speed, to control air flow and direction. ®

The blade pitch on an F/X fan is controlled hydraulically through two hydraulic ports. These ports supply fluid to a small double acting hydraulic cylinder embedded within the mainshaft.

Pressuring either hydraulic port will move the fan blades into BLOWER (PUSH) or SUCTION (PULL) positions, respectively.

The Flexxaire® F/X fan has a CLEAN MODE used to clean debris from the radiator, oil cooler, A/C condenser and air intake screens during operation. Clean mode changes the pitch of the fan blades causing air flow to move in the opposite direction, thereby forcing dust and debris off the radiator, oil cooler, A/C condenser and air intake screen. Ensure that there are no personnel standing near the machine when performing this operation, as dust and debris will fly out. Refer to FAN SWITCH (OPTIONAL) in SECTION 2 of the OPERATOR S MANUAL for operating instructions.

When installed on the Tigercat 718 pilot oil is supplied to the hydraulic ports from pilot manifold ports C6 and C7. Refer to FLEXXAIRE® FAN CIRCUIT DIAGRAM in THIS SECTION. For additional information regarding the operation of the Flexxaire® fan refer to FAN SWITCH (OPTIONAL) and CLEANING A/C CONDENSER AND OIL COOLER/RADIATOR in SECTION 2 of THE OPERATOR'S MANUAL.

Standard suction mode. Prescreened air passes through the coolers.

Clean mode. Quickly and effectively removes debris from the heat exchangers and air intake screens.

FLEXXAIRE® FAN OPERATION

10.8

Tigercat 718 Feller Buncher

Oil Cooler

FLEXXAIRE® FAN CIRCUIT (OPTIONAL) 718-07

10.9

Tigercat 718 Feller Buncher

Oil Cooler

BLADE LOCK-OUT PROCEDURE

F.

Flexxaire s F/X fan contains two lockout pins, 180° apart, built into the hub assembly. In the event that a hydraulic and/or electrical system failure occurs and these systems are unable to change pitch, the blades can be locked-out in a full SUCTION (PULL - Figure 2) or BLOWER (PUSH Figure 3) blade orientation as required. The following procedure describes how to lock-out the blades.

G. Manually rotate the blades into the desired full pitch orientation.

®

Deactivate/plug disconnected hydraulic lines.

CAUTION: Hot oil may eject from the hydraulic fittings.

H. Slide the lock-out pins towards the blade and into the holes of the blade mounting shafts.

I.

Tighten the capscrews while the pins are in the holes of the blade mounting shafts. As shown in Figure 5.

#8 CAPSCREW IN EXTENDED POSITION

718-D32

FIGURE 2 SUCTION (PULL)

FIGURE 3 BLOWER(PUSH) 718-D30

A. Stop the engine of the machine.

B. Gain access to the two - #8 capscrews on the rear of the fan hub. Refer to Figure 4.

NOTE: Two - #8 capscrews are spaced 180° apart from one another.

C. Loosen, but do not remove the two capscrews.

D. Disconnect the hydraulic lines from main shaft assembly.

FIGURE 5 LOCKED POSITION

J. Attempt to manually rotate the blades; they should remain locked in the desired pitch mode. However if they do not lock, repeat Steps G through J until blades are locked and then continue.

K. Blades will now maintain their full pitch orientation when the machine engine is started.

NOTE: No purging will be available until the hydraulic failure is corrected. Contact your local dealer and/or Flexxaire® Manufacturing Inc. for further assistance.

E. Cover the hydraulic fittings on the main shaft assembly and hydraulic lines with caps.

L. Blade lock-out procedure is complete. #8 CAPSCREW IN RETRACTED POSITION

718-D31

FIGURE 4 UNLOCKED POSITION

10.10

Tigercat 718 Feller Buncher

Oil Cooler

FLEXXAIRE® FAN LUBRICATION AND SERVICE INTERVALS

A. Mechanical Review

The Flexxaire® F/X Fan does require visual inspections and oil check s to be done as illustrated in Table 1.. See Figure 16 for location of oil fill and drain plugs and oil level plug.

Table 1: Flexxaire® Fan Service Interval Chart Monthly or 250 hrs.

Visual check for oil leaks.

6 months or 1000 hrs. Check oil level, fan blades. Perform mechanical review.

4 years or 6000 hrs. Oil change.

Ensure that the fan and blades rotate smoothly.

Check for damage to fan blades.

Monitor wear of internal fan components by oil analysis (optional).

B. Fan Blades Typical service life for fan blades is 10,000 hours or higher. Actual blade is dependent on operating conditions. High abrasive environments will subject the blades to considerably higher wear.

NOTE: If blades are wearing out before 10,000 hours due to abrasive wear, contact the Product Support Department for Abrasion Resistant Blades.

FLEXXAIRESERVICE.XLS

718-D27

10.11

Tigercat 718 Feller Buncher

Oil Cooler

CHECKING HUB OIL The hydraulic hub contains MOBIL Synthetic SHC629 oil. Refer to Table 2 below for other oil alternatives. A visual inspection should be done every 1000 hours. If necessary oil should be added as per following procedures for 6, 8 and 10 blade hub assemblies.

OIL FILL PLUG

12 O CLOCK

10O CLOCK

AIR FILLED AREA

2 O CLOCK

OIL LEVEL PLUG

Checking Oil Level And Adding Oil A.

Rotate the hub until the FILL plug is at the 12:00 position. As indicated in Figure 16.

OIL FILLED AREA

B. Remove the Oil Level Plug from Bearing Carrier.

C. Rotate hub until oil starts to drip. If rotation is more than 45N (2:00 position) oil is required.

6 O CLOCK 718-D28

D. Rotate hub back to the 12:00 position. Figure 16

OIL DRAIN PLUG

FIGURE 18

CAUTION

OIL FILL PLUG (DRAIN PLUG LOCATED 180° ON OTHER SIDE OF HUB.

DO NOT OVER FILL HUB. An air space is required to allow for oil expansion, as shown in Figure 18. Failure to do so will result in seal failure.

Hub Oil Capacity (Approximate) 6 Blade fan - 1.3 liters (1.4 U.S. quarts)

LOCATION OF OIL LEVEL PLUG AND STATO SEAL LOCATION. 718-D29

FIGURE 16

NOTE: Use the above capacities as a guide only.

Refer to the above Adding Oil procedures to ensure the correct amount of recommended oil is put into the hub.

E. Add oil until it drips from the Oil Level Hole, not the FILL plug.

F.

Reinstall plugs after applying pipe thread sealant.

G. Check for leaks.

CAUTION Low oil may indicate a leak.

10.12

Tigercat 718 Feller Buncher

Oil Cooler

MAINTENANCE CHECKLIST FLEXXAIRE® FAN This checklist is to provide some basic infomation to be used at time of machinery delivery and at regular maintenance intervals.

718-D34

10.13

Tigercat 718 Feller Buncher

Oil Cooler

10.14

Tigercat 718 Feller Buncher

SECTION 11- STEERING AND CENTER JOINT MAY 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 ............................................................................. 11.7 CIRCUIT DIAGRAM ..................................................................................... 11.6 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 718 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 718 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 724D-D04

STEER RELIEF VALVE

PRESSURE

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 718 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

SPOOL CENTERING SPRING

90136-3

LOAD CHECK VALVE

RELIEF VALVE PORT 'B'

B

SPOOL TANK PASSAGE

THRU' NEUTRAL PASSAGE

STEERING VALVE CROSS SECTION

11.4

Tigercat 718 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 718 Feller Buncher

718-06

Steering and Center Joint

STEER CIRCUIT DIAGRAM 11.6

Tigercat 718 Feller Buncher STEER CIRCUIT DESCRIPTION

Steering and Center Joint

Two steer cylinders are used to steer the machine. Operating oil is supplied from a 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 via 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 main relief valve to direct oil back to tank.

NOTE: Hydraulic lines to the steer cylinders must be cross connected to allow the machine to steer while being towed by another vehicle. For complete towing information, refer to TOWING INSTRUCTIONS in SECTION 2 of the OPERATOR'S MANUAL.

11.7

Tigercat 718 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 718 Feller Buncher

Steering and Center Joint

5. Start the engine and set the throttle control to IDLE. 6. Ensure hydraulic oil is at operating temperature. Refer to HYDRAULIC OIL HEATING PROCEDURE in SECTION 5 of THIS MANUAL.

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 724D-D04

STEER RELIEF

PRESSURE

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 718 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 718 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

• • • GREASE SEALS WITH SPRINGS FACING DOWN 726B09

4

9

• • •

10 3 2 TORQUE TO 282 - 310 LBF-FT. NO LOCTITE REQUIRED

5

• • CENTER JOINT 11.11

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

Tigercat 718 Feller Buncher

Steering and Center Joint

11.12

Tigercat 718 Feller Buncher

SECTION 12 - LIFT BOOM MAY 2002

CONTENTS - SECTION 12 BOOM LIFT LOCK ....................................................................................... 12.6 BOOM VALVE ASSEMBLY PROCEDURE ....................................................................... 12.6 CROSS SECTION OF SPOOL SECTION ................................................ 12.3 RELIEF VALVES .......................... SEE SECTION 18 - CLAMPS WITH SAW CIRCUIT DESCRIPTION ............................................................................. 12.4 CIRCUIT DIAGRAM ..................................................................................... 12.5 JOYSTICK VALVE ....................................................................................... 12.2 OPERATING DESCRIPTION ................................................................... 12.2 PRESSURE SETTINGS .............................................................................. 12.6 PUMP, DESCRIPTION BOOM/STEER PUMP ................................... SEE SECTION 11 - STEERING SAFETY ....................................................................................................... 12.6

Tigercat 718 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 718 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**

•

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

PILOT END CAP 90136-3

SPOOL CENTERING SPRING

WORK PORT BRIDGE

RELIEF VALVE PORT 'B'

B

PILOT END CAP SPOOL TANK PASSAGE

THRU' NEUTRAL PASSAGE

CROSS SECTION OF SPOOL SECTIONS 12.3

Tigercat 718 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 cylinders receive oil from a fixed displacement pump via the LIFT spool section in the boom valve. The 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 718 Feller Buncher

724D-09

Lift boom

LIFT BOOM CIRCUIT (SHOWN WITH SAW VALVE SECTION) 12.5

Tigercat 718 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 put the throttle control to the IDLE position.

IMPORTANT During the following procedures, DO NOT hold ANY function control for LONGER THAN 5 SECONDS.

WARNING

7. Ensure hydraulic oil is at operating temperature. Refer to HYDRAULIC OIL HEATING PROCEDURE in SECTION 5 of THIS MANUAL.

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

8. 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 the mid inlet test port.

12.6

Tigercat 718 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 DOWN position, 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 718 Feller Buncher BOOM VALVE ASSEMBLY PROCEDURE

Lift boom

4. Position end section on last spool section as shown and hand tighten tie rod nuts.

1. Lay out valve components on a clean, flat working surface. The inlet assembly will include an "O" ring, aload check poppet and a load check spring. Tools required for basic valve assembly include a 3/4" and 11/16" wrench and a torque wrench with thin wall sockets.

5. Position valve assembly with the mounting pads of the end sections on a flat surface. To obtain proper alignment of end sections relative to the spool sections, apply downward pressure to the end sections and snug the tie rod nuts to 10 lbf-ft.

Torque the two 11/16" nuts at 45-50 lbf-ft.

Torque the 3/4" nut at 70-80 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.

6. Install auxilliary valves and plugs and torque to proper values.

3. Place first spool section ("O" ring side facing up) on the inlet section. Position "O" ring in to groove and insert load check poppet (nose down) and spring (behind poppet) into load check cavity as shown. Repeat this procedure for each spool section. The load check springs are compressed by the followingsections during assembly.

12.8

Tigercat 718 Feller Buncher

SECTION 13 - TILT 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

JUNE 2002

Tigercat 718 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

**NOTE**

SAW

MAIN RELIEF (2600 PSI)

SHEAR AND CLAMP SPOOL SECTION FOR BUNCHING SHEAR INSTALLATIONS

BOOM VALVE (SHOWN WITH SAW) AT023A

CONTROL VALVES

TILT CIRCUIT DESCRIPTION

For a complete description of the main control valve, refer to BOOM CONTROL VALVE in SECTION 12 of THIS MANUAL.

The boom valve in use will vary depending on whether a saw attachment or bunching shear is being used. Which ever valve is used, the following circuit description and pressure setting procedures will apply for both.

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

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

Two cylinders are used to tilt the felling head forward and back. The cylinders receive oil from 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 718 Feller Buncher

724D-10

Tilt

TILT CIRCUIT (SHOWN WITH SAW VALVE SECTION) 13.3

Tigercat 718 Feller Buncher PRESSURE SETTINGS

Tilt 3. Connect a 0 - 5000 psi pressure gauge (with at least 4' of hose) to the mid inlet test port.

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

WARNING

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

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

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

Wear safety glasses and safety shoes when working on shears.

Do not stand on top or inside of boom arms.

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

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

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

WARNING

7. Ensure hydraulic oil is at operating temperature. Refer to HYDRAULIC OIL HEATING PROCEDURE in SECTION 5 of THIS MANUAL.

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

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

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.

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 During the following procedures, DO NOT hold ANY function control for LONGER THAN 5 SECONDS.

WARNING

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.

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

13.4

Tigercat 718 Feller Buncher

Tilt

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.

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.

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

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.

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

13.5

Tigercat 718 Feller Buncher

Tilt

13.6

Tigercat 718 Feller Buncher

SECTION 17 - SAW DRIVE JUNE 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 .......................................................................................................... 17.7 TEST PORT ............................................................................................. 17.7 SAW VALVES SAW SECTION OF BOOM VALVE ......................................................... 17.3 SOLENOID OPERATED PILOT VALVE ................................................... 17.2

Tigercat 718 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 in 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 spool section of the main saw valve.

SOLENOID TO SAW SWITCH

TO BOOM/SAW MAIN VALVE

TEST PORT

C8

720B16

PILOT MANIFOLD (SAW)

17.2

Tigercat 718 Feller Buncher

Saw drive PARALLEL PASSAGE

LOAD CHECK VALVE

A

PLUG

WORK PORT BRIDGE

B PLUG

PILOT END CAP

SPOOL CENTERING SPRING

PILOT END CAP SPOOL TANK PASSAGE

THRU' NEUTRAL PASSAGE

90136-4

CROSS SECTION OF SAW SPOOL SECTION

SAW VALVE

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

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 SAW RELIEF (3900 PSI)

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

For a detailed boom valve description, refer to SECTION 12 of THIS MANUAL.

•

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 SECTION OF BOOM CONTROL VALVE OUTLET SECTION

SAW INLET 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 relief valve installed in the saw inlet section of the main saw valve is to protect 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 718 Feller Buncher

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 saw valve.

SAW CIRCUIT DESCRIPTION The saw blade is driven by a variable displacement hydraulic motor (axial piston, bent axis) which is mounted directly above the saw blade and coupled to the saw blade through a drive shaft. A variable displacement hydraulic pump mounted on the pump drive gearbox supplies oil flow to the motor via the saw 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 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 in the main control valve.

The saw switch on the control panel in the cab is used to turn the saw ON or OFF. It is a two position switch with a built in green light. This switch controls the flow of electrical current via the saw relay to the saw pilot valve solenoid.

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

NOTE: The saw will not run unless both cab doors are closed and the pilot reset switch is pressed to activate the pilot system.

For additional information, refer to SAW SWITCH and PILOT RESET SWITCH in SECTION 2 of the OPERATOR'S MANUAL.

IMPORTANT

724D-12

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 saw valve. This will direct oil from the saw pump to the saw motor, causing the system pressure to rise and start to turn the saw blade.

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 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 718 Feller Buncher

718-16

Saw drive

SAW CIRCUIT DIAGRAM 17.5

Tigercat 718 Feller Buncher PRESSURE SETTINGS:

Saw drive 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:~

WARNING

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.

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.

Guards, wear plates and covers must be properly attached during operation of saw blade.

Do not, under any circumstances, overspeed the saw blade RPM. Be aware that the saw blade is virtually silent as it coasts to a stop.

2. Remove all guards and check that the area in and around the saw blade is free of loose objects (wood, stones, nuts, bolts, etc.).

Make sure all tools and spare parts are removed from the saw head area.

3. Rotate blade slowly by hand and check for "runout " and "wobble ".

A slowly rotating blade can crush bones.

Beware pinch points when rotating blade by hand.

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

Do not reach between boom crank arms or link arms at any time during setup.

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

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

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

Clamp and Accumulator arms open and close very rapidly. Keep clear of their operating range.

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

Wear safety shoes and safety glasses when working on saws.

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

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

Keep clamp and accumulator arms closed whenever possible during setup.

If a vibration or imbalance is detected, shut the saw down immediately and check problem.

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

Check torque on saw blade mounting bolts and tooth mounting bolts before starting saw.

10. Ensure hydraulic oil is at operating temperature. Refer to HYDRAULIC OIL HEATING PROCEDURE in SECTION 5 of THIS MANUAL.

Install saw blade locking pin, except when setting motor "begin of stroke" and blade RPM.

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

17.6

Tigercat 718 Feller Buncher

Saw drive SAW PUMP

SAW SPOOL SECTION

••

••

SAW RELIEF (3900 PSI)

POR. ADJUSTING SCREW. (3600 PSI)

•• •• SECOND STAGE ADJUSTING SCREW DO NOT ADJUST. SEE IMPORTANT NOTE BELOW 724D-D44

••

SAW PUMP

TO SAW GAUGE ON SIDESTAND

•

GAUGE TEST PORT 724D-D20

11. Install a 0-5000 psi pressure gauge in test port on saw pump for use when working at rear of machine.

••

•

SAW SECTION OF BOOM CONTROL VALVE

SAW INLET SECTION

14. Start the engine.

IMPORTANT

11a Use gauge on sidestand when adjusting saw valve main relief at front of machine.

Before starting engine, ensure relief valve is unscrewed as stated in paragraph 13, or damage could occur to the piston pump.

SAW GAUGE

15. Place throttle control in the IDLE position.

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

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

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

213-24

12. Loosen locknut and screw POR adjusting screw on the saw pump all the way IN. This is a temporary adjustment until the saw relief valve has been set.

18. Set POR 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.

13. Screw main relief valve adjusting screw on saw control valve OUT until spring pressure is relieved.

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

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

SET MOTOR POR. (BEGIN OF DISPLACEMENT REGULATION) SET MOTOR MINIMUM DISPLACEMENT Refer to the attachment manufacturer's own OPERATOR AND MAINTENANCE MANUAL for this information.

Tigercat 718 Feller Buncher

Saw drive

17.8

Tigercat 718 Feller Buncher

SECTION 18 - CLAMPS WITH SAW JUNE 2002

CONTENTS - SECTION 18 BOOM VALVE ............................................................................................. 18.2 OPERATING DESCRIPTION ................................................................... 18.3 SPOOL SECTION DIAGRAM ................................................................... 18.3 BOOM LIFT LOCK ....................................................................................... 18.6 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 718 Feller Buncher CONTROL VALVES

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

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

For a complete description of the pilot manifold refer to SECTION 5 of THIS MANUAL.

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 foot operated pilot valve, refer to FOOT CONTROL VALVE in SECTION 8 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.

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.

CLAMP 'CLOSE' PORT RELIEF (3200 PSI) CLAMP 'OPEN' PORT RELIEF (1100 PSI)

ACCUMULATOR 'CLOSE' PORT RELIEF (3200 PSI)

CLAMP

ACCUM

•

•

•

MID. INLET SECTION

GAUGE TEST PORT (IN ELBOW)

MAIN RELIEF (2600 PSI)

•

SAW RELIEF

END INLET SECTION

AT023ACC

ACCUMULATOR 'OPEN' PORT RELIEF (3200 PSI)

BOOM AND SAW MAIN CONTROL VALVE

18.2

Tigercat 718 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

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.

LOAD CHECK VALVE

A

PILOT END CAP

90136-3

SPOOL CENTERING SPRING

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.

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.

WORK PORT BRIDGE

RELIEF VALVE PORT 'B'

B

PILOT END CAP SPOOL TANK PASSAGE

THRU' NEUTRAL PASSAGE

CROSS SECTION OF CLAMP SPOOL SECTION

18.3

Tigercat 718 Feller Buncher CLAMPS WITH SAW

Clamps with Saw

TIGERCAT DW5000 (19") AND DW5600 (22") Bunching Saw Heads.

Koehring Waterous 20" Saw Heads NOTE: Circuit using a Tigercat attachment (with single clamp and accum. arms) is described below. Circuit is identical for Koehring Waterous attachments but there are dual clamp and accum. arms.

CIRCUIT DESCRIPTION The clamp and accumulating arms are operated by separate cylinders. A fixed displacement pump supplies oil to the cylinders via two spool sections in the boom valve.

The clamp arm is operated by the clamp foot control valve (left side of the cab floor). The left pedal to OPEN and the right pedal to CLOSE. Pressing the CLAMP OPEN pedal directs pilot oil to shift the spool in the clamp spool section.

Pressing the CLAMP CLOSE pedal directs pilot oil to the opposite end of the spool to shift it in the opposite direction. The spool directs oil from the pump to either end of the clamp arm cylinder to open or close the arm. Return oil is directed back to tank via the oil cooler.

The accumulating arm is operated by a 3 position thumb switch OPEN/CLOSE (self centering to OFF) located on the right joystick control. 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 718 Feller Buncher

724D-13

Clamps with Saw

ACCUMULATING AND CLAMP ARMS CIRCUIT WITH SAW 18.5

Tigercat 718 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.

WARNING

Wear safety glasses and safety shoes when working on shears.

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.

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.

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 .

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

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 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. 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

7. Ensure hydraulic oil is at operating temperature. Refer to HYDRAULIC OIL HEATING PROCEDURE in SECTION 5 of THIS MANUAL. 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.

IMPORTANT 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 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

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.

18.6

Tigercat 718 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.

9. While holding the right joystick thumb switch to the left in the ACCUMULATING ARM OPEN position (accumulator cylinder fully retracted), check gauge pressure reading.

If less than 3200 psi, stop engine and readjust accumulator open port relief.

Repeat above procedure until a gauge reading of 3200 psi is obtained.

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

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.

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

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

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

13. While holding the joystick thumb switch in the ACCUMULATING ARM OPEN position, check gauge pressure reading.

If less than 2600 psi, stop engine and readjust mid inlet main relief. Repeat above procedure until a gauge reading of 2600 psi is obtained.

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

SET PILOT LINE PRESSURES: NOTE: Refer to SECTION 5 of THIS MANUAL.

18.7

Tigercat 718 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

Step 3.

T

SEATING POPPET

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.

T

VALVE POPPET

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

T

STEP 4

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 718 Feller Buncher

Clamps with Saw

ANTI-CAVITATION RELIEF VALVE ADJUSTING PROCEDURE

ANTI-CAVITATION RELIEF VALVE ADJUSTING PROCEDURE

For relief valve with adjusting nut

For relief valve with adjusting screw

ADJUSTING NUT

•

ADJUSTING SCREW

JAMNUT

JAMNUT

•

• •

51055-2

RELIEF VALVE 51055-20

RELIEF VALVE

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 using 6 - 8 lbf - ft., making sure the adjusting screw does not turn.

3. 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

5. Re-check relief setting.

Tigercat 718 Feller Buncher

Clamps with Saw

18.10

Tigercat 718 Feller Buncher

SECTION 19 - SHEAR WITH CLAMPS JUNE 2002

CONTENTS - SECTION 19 BOOM LIFT LOCK ....................................................................................... 19.6 BOOM VALVE .............................................................................................. 19.2 OPERATING DESCRIPTION ................................................................... 19.3 SPOOL SECTION .................................................................................... 19.3 CIRCUIT DESCRIPTION ............................................................................. 19.5 CIRCUIT DIAGRAM ..................................................................................... 19.4 CONTROL VALVES ..................................................................................... 19.2 FOOT OPERATED PILOT VALVE ............................. See SECTION 8 - DRIVE PRESSURE SETTINGS ............................................................................... 19.6 SAFETY ....................................................................................................... 19.6 SHEAR PUMP POR VALVE ............................................................................................. 19.7 TEST PORT ............................................................................................. 19.7

Tigercat 718 Feller Buncher CLAMPS WITH SHEAR

Shear with Clamps Two of the five spool sections are used to open and close the shear/clamp and a third spool section to open and close the accumulating arm.

Tigercat 1800 and 2000 Model Bunching Shears The shear/clamp and accumulating arm circuits are controlled by two solenoid operated pilot valves in the pilot manifold, a foot operated pilot valve and a pilot operated boom valve.

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

For a description of the PILOT MANIFOLD refer to SECTION 5 of THIS MANUAL.

All five spools in the valve are open center type.

Each spool section is pilot operated.

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

An outlet section directs return oil back to tank.

CONTROL VALVES

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

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

BOOM VALVE (WITH SHEAR) The boom valve and is located on the front chassis above the front axle and behind the cover plate.

OUTLET SECTION

SHEAR 'OPEN' PORT RELIEF (3200 PSI)

PLUG (NO PORT RELIEF) SHEAR AND CLAMP

ACCUMULATOR ARM 'CLOSE' PORT RELIEF (3200 PSI)

ACCUM.

GAUGE TEST PORT FOR ACCUM. ARM AND SHEAR OPEN

END INLET SECTION

3713AIL2

ACCUMULATOR ARM 'OPEN' PORT RELIEF (3200 PSI)

MAIN RELIEF (2600 PSI)

•

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

•

• SHEAR AND CLAMP

•

CLAMP 'OPEN' PORT RELIEF (3700 PSI)

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

BOOM VALVE SHOWN WITH SHEAR

19.2

Tigercat 718 Feller Buncher RELIEF VALVE PORT 'A'

Shear with Clamps LOAD CHECK VALVE

PARALLEL PASSAGE

A

PILOT END CAP 90136-3

SPOOL CENTERING SPRING

WORK PORT BRIDGE

RELIEF VALVE PORT 'B'

B

PILOT END CAP SPOOL TANK PASSAGE

THRU' NEUTRAL PASSAGE

CROSS SECTION OF SHEAR/CLAMP SPOOL SECTION (END)

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

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.

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.

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

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

The relief valves installed in the first shear/clamp spool section of the boom valve are to 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.

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

19.3

Tigercat 718 Feller Buncher

718-08

Shear with Clamps

SHEAR WITH CLAMPS CIRCUIT 19.4

Tigercat 718 Feller Buncher

Shear with Clamps

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

The shear and clamp arm open and close together by the clamp arms/shear foot control valve (left side of cab floor). The left foot pedal is used to OPEN and the right foot pedal to CLOSE. Pressing the CLAMP/SHEAR OPEN pedal directs pilot oil to shift the spools in both SHEAR/CLAMP spool sections. The first spool section at the front of the valve directs oil from the shear pump to the rod end of the clamp cylinder to open the clamp arm. The second spool section, located next to the accumulator section, directs oil from the boom/steer pump to the rod end of the shear cylinder to open the shear.

Pressing the CLAMP/SHEAR CLOSE pedal directs pilot oil to the opposite end of both spools to shift them in the opposite direction. In this case oil from both pumps combines at the manifold on the shear head providing additional flow to close the shear and clamp together more quickly.

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 which direct pilot oil to the ACCUMULATING spool section of the boom valve to shift the spool. The spool directs oil from the fixed displacement boom pump to either end of the accumulating arm cylinder to open or close the arm. Return oil is directed back to tank via the oil cooler and primary return dual head filter.

19.5

Tigercat 718 Feller Buncher PRESSURE SETTINGS

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

Before starting this procedure, read the following safety precautions:~ Do not assume that other workers are aware of the dangers associated with shears.

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.

Because of background noise, a closing (or opening) shear is virtually silent.

Shear blades and clamp arms open and close very rapidly, always keep clear of operating area.

Keep clamp and accumulator arms closed whenever possible during setup.

WARNING

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

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

Do not stand on top or inside of boom arms.

When a shear is attached to a machine, the blade mounting bolts must be retorqued.

Wear safety glasses and safety shoes when working on shears.

TO SET SHEAR OPEN AND ACCUMULATOR OPEN AND CLOSE RELIEF VALVES:-

Check for foreign objects (wood, stones, nuts, bolts, etc.) resting on or around the blades. Make sure all tools and spare parts are removed from the shear area. If shear closes on any object, injury may occur from propelled objects or pieces.

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

Check torque on blade mounting bolts.

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

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

Warn everyone to stay away from the shear head and the immediate area.

5. Turn the port relief valve adjusting screws on both the accumulating and clamp spool sections of the control valve OUT until spring pressure is relieved then turn adjusting screws one full turn IN.

Slowly close the shear blade and check for proper clearances, alignment and operation.

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.

SHEAR AND CLAMP ACCUM

WARNING TEST PORTS ON ELBOWS

SHEAR AND CLAMP

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

3717AIL2

19.6

BOOM AND SHEAR MAIN VALVE

Tigercat 718 Feller Buncher

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

6. Start the engine, and set throttle to IDLE.

IMPORTANT

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

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

IMPORTANT

7. Ensure hydraulic oil is at operating temperature. Refer to HYDRAULIC OIL HEATING PROCEDURE in SECTION 5 of THIS MANUAL.

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

13. While holding the joystick thumb switch in the ACCUMULATING ARM OPEN position, check gauge pressure reading.

IMPORTANT

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.

During the following procedures, DO NOT hold ANY function control for LONGER THAN 5 SECONDS.

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

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

SHEAR PUMP

•

••

IMPORTANT

POR. ADJUSTING SCREW. POR. VALVE (3600 PSI)

••

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.

SECOND STAGE ADJUSTING SCREW DO NOT ADJUST. SEE IMPORTANT NOTE BELOW

8. While holding the foot pedal in the CLAMP/ SHEAR OPEN position (shear cylinder fully retracted), check gauge pressure reading.

724D-D44

If less than 3200 psi, stop engine and readjust SHEAR OPEN port relief. Repeat above procedure until a gauge reading of 3200 psi is obtained.

•

SHEAR PUMP

GAUGE TEST PORT

TO SET SHEAR/CLAMP CLOSE AND CLAMP OPEN RELIEF VALVES:15. Connect a 0 - 5000 psi . pressure gauge (with at least 4' of hose) to test port on the end inlet section of the boom and shear control valve.

9. While holding the right joystick thumb switch in the ACCUMULATING ARM OPEN position (accumulating cylinder fully retracted), check gauge pressure reading.

16. Connect a 0-5000 psi pressure gauge in test port on SHEAR PUMP for use when working at rear of machine.

If less than 3200 psi, stop engine and readjust ACCUMULATING ARM OPEN port relief. Repeat above procedure until a gauge reading of 3200 psi is obtained.

17. 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.

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

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.

If less than 3200 psi, stop engine and readjust ACCUMULATING ARM CLOSE port relief. Repeat above procedure until a gauge reading of 3200 psi is obtained.

Continued on next page

19.7

Tigercat 718 Feller Buncher

Shear with Clamps

18. At the valve, unscrew both port relief valve adjusting screws on the SHEAR spool section until spring pressure is relieved.

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

IMPORTANT Before starting engine, ensure both port relief valves are unscrewed as stated in paragraph 16, or damage could occur to the piston pump.

20. While holding the foot pedal in the SHEAR/ CLAMP CLOSED position (shear and clamp cylinders fully extended) check gauge pressure reading.

If less than 3700 psi, stop engine and readjust CLAMP/SHEAR CLOSE port relief.

Repeat above procedure until a gauge reading of 3700 psi is obtained.

NOTE: Engine RPM may have to be increased a small amount to prevent stalling.

21. While holding the foot pedal in the SHEAR/ CLAMP OPEN position (clamp cylinder fully retracted), check gauge pressure reading.

If less than 3700 psi, stop engine and readjust CLAMP OPEN port relief. Repeat above procedure until a gauge reading of 3700 psi is obtained.

22. While holding the foot pedal in the SHEAR/ CLAMP OPEN position (clamp cylinder fully retracted), set POR valve on pump to 3500 psi on gauge at rear of machine.

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

SET PILOT LINE PRESSURES NOTE: Refer to PILOT PRESSURE SETTINGS in SECTION 5 of THIS MANUAL.

19.8