Tigercat 870B FELLER BUNCHER SERVICE MANUAL - PDF DOWNLOAD

SERVICE MANUAL Tigercat 870B FELLER BUNCHER TABLE OF CONTENTS

ISSUE 1.2, JUNE 2003

SECTION INTRODUCTION ............................................................................................................... ii NON-APPROVED FIELD PRODUCT CHANGES ............................................................ 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 HYDRAULIC SYSTEM/ LOAD SENSE CONTROL ........................................................... 4 PILOT/CHARGE SYSTEM ................................................................................................ 5 ELECTRICAL, GAUGES AND ALARMS ........................................................................... 6 ENGINE START AND STOP ............................................................................................. 7 ENGINE ANTI-STALL ....................................................................................................... 9 TRACK DRIVE ................................................................................................................ 11 BOOM FUNCTIONS ....................................................................................................... 12 SWING ............................................................................................................................ 15 SAW DRIVE .................................................................................................................... 17 WRIST AND CLAMPS .................................................................................................... 18

870B-SM00

870B Feller Buncher Available Literature Operator's Manual ............................... Part No. 18875A Service Manual .................................... Part No. 18876A Parts Catalog ....................................... Part No. 18874A Hydraulic Adapters Book ....................... Part No. 1472A Hydraulic Hose Assemblies Book ......... Part No. 3707A

Tigercat

®

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

Tigercat 870B Feller Buncher

Introduction

ii

Tigercat 870B Feller Buncher

Tigercat 870B Feller Buncher

Introduction

INTRODUCTION An Operator's manual, Service manual and a Parts catalog are made available by Tigercat to assist the dealer, customer and operator in becoming familiar with the features of the 870B Feller Buncher serial number 8700501 to 8700999 or 870T0501 to 870T0999 if configured as a leveller.

The operator's manual will assist the operator with the techniques of proper and safe operation of the 870B Feller Buncher. There is also important information regarding the safe operation of the saw head.

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

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

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

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

The 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.

870BACTION 1

iii

Tigercat 870B 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.

iv

Tigercat 870B 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 attchment or accessories.

CONTENTS - SECTION 1 BATTERY DISCONNECT SWITCH ................................................................. 1.9 CAB EXITS ..................................................................................................... 1.6 COOLING SYSTEM ...................................................................................... 1.11 EFFICIENT REACH (ER) BOOM SYSTEM PRECAUTIONS ......................... 1.12 EMERGENCY CAB EXITS .............................................................................. 1.6 ENGINE DOORS .......................................................................................... 1.11 EXHAUST FUMES ........................................................................................ 1.12 FELLING TREES ............................................................................................ 1.9 FIRE PREVENTION ...................................................................................... 1.14 FIRE PREVENTION GUIDELINES ............................................................. 1.14 WHAT ELSE TO DO BEFORE YOU EXPERIENCE A FIRE ...................... 1.15 WHAT TO DO AFTER A FIRE ................................................................... 1.16 WHAT TO DO IN CASE OF A MACHINE FIRE .......................................... 1.15 FIRST AID ....................................................................................................... 1.4 FLUID LEAKS ............................................................................................... 1.10 HYDRAULIC PRESSURE HAZARD .............................................................. 1.11 LOOSE CLOTHING HAZARD ........................................................................ 1.11 PARKING HAZARDS ...................................................................................... 1.9 PROTECTIVE CLOTHING ............................................................................... 1.3 SAFETY INTERLOCK SWITCHES ON LEFT ARM REST .............................. 1.7 SAFETY PRECAUTIONS, GENERAL ............................................................ 1.3 SAFETY PRECAUTIONS, OPERATING ......................................................... 1.6 SAFETY PRECAUTIONS, SERVICING ........................................................ 1.10 SAFETY SYMBOLS ....................................................................................... 1.2 SIGNAL WORDS ............................................................................................ 1.2

Tigercat 870B 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 870B 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.

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

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

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.

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

WARNING The saw guard must be installed when working on the saw motor hydraulic circuit or when the saw head is not being used.

Before installing or removing the saw guard or locking bolt, saw blade must be at a complete stop and engine must be shut down.

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.

Do not let untrained persons operate the machine.

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.

Use recommended protective clothing and safety devices such as gloves, safety boots, safety hat, goggles, and ear protection when necessary.

These safety rules highlight both general and specific measures that 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

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 seat armrest or joystick as handle when entering or leaving the cab.

Do not use the machine foot controls as steps.

Tigercat 870B Feller Buncher

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

GENERAL SAFETY PRECAUTIONS continued

Check all fluid levels.

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

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

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

Avoid mounting or dismounting the machine in areas with slippery surfaces. If this is not possible, clean up or cover slippery surfaces with a non-slip material.

Safety Hazards - Viton Seals O-rings and other seals manufactured of Viton material (fluarine rubber) produce a highly corrosive acid (Hydrofluoric) 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.

•

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 fluro-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.

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

Machine should be washed completely at every major service.

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

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

Check windows and door guards for damage.

NOTE:

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

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

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

Maintain a charged fire extinguisher on the vehicle at all times and KNOW HOW TO USE IT. 1.4

Tigercat 870B 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.

Do not carry passengers either in the cab or anywhere else on the machine. The vehicle is provided and approved with seating for the operator only.

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

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

Wash hands after handling.

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 ft. (3m) between the machine or boom and any power line carrying up to 50,000 volts or less plus 1/2 inch (10mm) for each addition 1,000 volts above the 50,000 volt level.

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

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

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 870B Feller Buncher

Safety CAB EXITS

OPERATING SAFETY PRECAUTIONS

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

1. Side door, this is also the main point of entry and is the only door that should be used under normal operating conditions to enter or leave the cab.

2. Rear window, should be used for emergency exits only.

3. Skylight , this is a third cab exit for use if the side door or rear window exits become blocked.

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

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

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

All three exits should be checked to make sure that they are operational and will function in an emergency.

Sound the machine horn before starting the machine.

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

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

Do not open/remove an escape hatch, skylight or the cab door to increase ventilation when operating the machine.

Start the engine according to the instructions in this manual. Refer to OPERATING MACHINE in SECTION 2 of the OPERATOR'S MANUAL. Never use a liquid staring aid to start an engine.

WARNING

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

1.6

Tigercat 870B Feller Buncher

Safety

OPERATING SAFETY PRECAUTIONS continued SAFETY INTERLOCK SWITCH ON LEFT ARMREST: The left arm rest is equipped with a safety interlock switch to prevent the machine from being operated while the armrest is in the raised position (pilot system is shut off).

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

NOTE: The engine can be started but the machine functions cannot be operated with the left arm rest up.

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

Secure loose items in the cab.

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

•• PILOT SYSTEM SHUT OFF SWITCH

377-17A

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

LEFT ARM REST IN "UP" POSITION AND LIMIT SWITCH "OFF"

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

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

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

377-18A

LEFT ARM REST IN "DOWN" POSITION AND LIMIT SWITCH "ON"

To operate: With the engine running and the left arm rest DOWN, push the pilot reset switch.

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.

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

The left arm rest safety interlock switch (pilot system shut off limit switch) and the pilot reset switch are a safety feature and their function must not be defeated in any way.

1.7

Tigercat 870B Feller Buncher

Safety

OPERATING SAFETY PRECAUTIONS continued If saw guard has been installed DO NOT remove until at the cutting site. Remove guard before starting engine.

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

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

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

Use only prearranged and approved signalling practices.

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

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

When travelling position 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.

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: •

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

•

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

•

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.

1.8

Tigercat 870B Feller Buncher

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

OPERATING SAFETY PRECAUTIONS continued 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.

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.

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

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.

Ensure that all saw tooth retaining bolts are at correct torque value. Refer to attachment manual for correct values.

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

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.

Always replace saw tooth retaining bolts when replacing saw teeth.

Before leaving operator's cab, lower the felling attachment onto the ground.

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

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

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

When parking the machine; •

Park on level ground only and engage the swing brake.

Shut down machine immediately if vibration occurs during cutting.

•

Do not park on a hillside or incline.

•

Lower felling attachment onto level ground.

•

Stop the engine.

•

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

•

Install saw guard.

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

Do not over load felling head.

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

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

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

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

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.

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.

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. Pre-plan to clear decks in advance before other equipment arrives.

1.9

Before transporting the machine check to ensure that all doors, panels and access covers are installed properly and secured. Improperly secured doors or panels pose a serious danger to pedestrians and other vehicles. Install saw guard.

Tigercat 870B Feller Buncher

Safety Prior to welding on any part of the machine, it should be cleaned and a fire extinguisher should be made available at the welding location.

SERVICING SAFETY PRECAUTIONS

Care must be taken in attaching the welding machine grounding clamp so current does not pass through bearings, especially the swing bearing.

Also, disconnect the negative (-) battery cable from both batteries.

DISCONNECT THE MULTI-PIN PLUG FROM THE ENGINE ANTI-STALL CONTROLLER

Conduct maintenance inspections at least as frequently as recommended in section 3 of the OPERATOR'S MANUAL. When servicing or repairing equipment, shut the engine down. Turn Master Disconnect switch OFF.

••

Install saw guard.

870B-01

WARNING

This machine is equipped with an electronic horsepower limiting control. Prior to welding, disconnect the multi-pin plug from the engine antistall controller located on the rear inside wall of the cab.

Before installing or removing the saw guard or locking bolt, saw blade must be at a complete stop and engine must be shut down.

The guard must be installed when working on the saw motor hydraulic circuit or when the saw head is not being used.

Never use your bare hand to check for fluid leaks.

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

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.

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.

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

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

1.10

Tigercat 870B Feller Buncher

Safety

SERVICING SAFETY PRECAUTIONS continued 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 the accumulator on later machines) by operating the joystick several times before performing work on components, or disconnecting any hoses. Also relieve pressure in the hydraulic tank by opening the air vent valve and waiting until the sound of escaping air stops.

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

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

Before performing work under the boom system ensure it is firmly supported.

WARNING Do not exceed maximum posted weight capacity of enclosure door by using as platform for heavy components or too many people.

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

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

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

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

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

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

WARNING

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

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

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

When opening or closing power operated engine doors, watch for personnel in door areas.

1.11

Tigercat 870B Feller Buncher

Safety ALWAYS install roof safety strut before working under roof area.

SERVICING SAFETY PRECAUTIONS continued

ROOF

WARNING This machine may be equipped with an Efficient Reach (ER) boom system. Because of this, it may behave in an unexpected manner compared to a conventional boom system.

••

MACHINE MODELS EQUIPPED WITH AN EFFICIENT REACH (ER) BOOM SYSTEM Pay attention to the following when servicing the Efficient Reach Boom System (ER Boom): Certain hydraulic circuits on this machine are inter-connected in order to provide level head travel and to recirculate hydraulic oil to reduce heat generation and fuel consumption. As a result, disconnecting hydraulic lines from one cylinder may release pressure in different cylinder at the same time. Before attempting to disconnect hydraulic hoses or perform work on the boom system, ensure that:-

251-14

INSTALL ROOF SAFETY STRUT

ALWAYS install door safety struts before working in door areas.

(a) The machine is parked on level ground with the head sitting flat on the ground. (b) The stick cylinders are fully extended (fig. 1) or the hoist cylinder fully collapsed (fig. 2).

•• STRUT

(c) The tip of the stick boom supported .

STICK CYLINDERS FULLY EXTENDED

870B-02

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

• TIP OF STICK BOOM FULLY SUPPORTED 870B-02

ER. BOOM SYSTEM. FIG.1

HOIST CYLINDER FULLY RETRACTED

•

TIP OF STICK BOOM FULLY SUPPORTED 870B-03

DOOR SAFETY STRUTS

ER. BOOM SYSTEM. FIG.2

1.12

Tigercat 870B Feller Buncher

Safety

SERVICING SAFETY PRECAUTIONS continued 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.

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

1.13

Tigercat 870B Feller Buncher

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

FIRE PREVENTION

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

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

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.

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.

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.

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.

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.

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.

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.

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.

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.

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

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 870B Feller Buncher

Safety WHAT TO DO IN CASE OF A MACHINE FIRE

FIRE PREVENTION continued

•

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.

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.

If you can safely do so, attempt to extinguish the 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 870B Feller Buncher

Safety WHAT TO DO AFTER A FIRE

FIRE PREVENTION continued Continued from page 15

20229A

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

•

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.

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

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

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

Tigercat

5211A • R2-1101

PAGE 1 OF 16

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using high speed disc saws safely FORWARD:

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

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

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

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

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

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

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

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

THE DANGERS

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

• Soil particles are thrown from the ground.

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

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

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

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

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

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using high speed disc saws safely

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

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

THROW ANGLE

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

•

•

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

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

THROW ANGLE

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

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

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

THROW ANGLE

NUDGED LOG WILL NOT CONTACT SAW TEETH.

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

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

5

using high speed disc saws safely Housing types cont.

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

A CHIP ESCAPE PORT CAN ALLOW THROW BEHIND THE MACHINE

REAR

FRONT

FIGURE 6a

FIGURE 6b

FIGURE 6c

FIGURE 6: ADDITIONAL OPENING IN THE HOUSING SKIRT.

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

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

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

6

using high speed disc saws safely COMMENTS AND INSTRUCTIONS

Tigercat

®

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

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

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

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

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

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

7

using high speed disc saws safely Comments and Instructions cont.

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

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

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

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using high speed disc saws safely

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

FIGURE 7a

PLAN VIEW OF MACHINE SHOWING CLOCKWISE AND COUNTERCLOCKWISE BLADE ROTATION

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

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

9

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using high speed disc saws safely Comments and Instructions cont.

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

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

SLAB

•

SLAB

• FE

ED

IN

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

TH DIR ROW EC TIO N

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

FIGURE 8

THROW ENGAGEMENT DISTANCE FELLING HEAD MOVING INTO SLAB/LOG

®

SLAB

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

• •

FIGURE 8b SIDE VIEW

FEED IN

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

10

FIGURE 8c TOP VIEW

using high speed disc saws safely Comments and Instructions cont.

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

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

• FE

ED

IN

FELLING HEAD MOVING INTO LOG PILE

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

SMALL LOG

THROW ENGAGEMENT DISTANCE LOG PILE

FEED IN

•

•

A SAW HOUSING WITHOUT SNOUTS ALLOWS A LONG THROW ENGAGEMENT DISTANCE

FIGURE 9b SIDE VIEW

FIGURE 9c TOP VIEW

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

FEED IN

11

using high speed disc saws safely Comments and Instructions cont.

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

UNCUT TREE OR STUMP BACKUP THROW ENGAGEMENT DISTANCE

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

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

FELLING HEAD MOVING INTO LOG

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

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

FELLING HEAD MOVING INTO STUMP (FEED SPEED)

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

12

using high speed disc saws safely Comments and Instructions cont.

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®

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

THROW GAP

FIGURE 12: SAW BLADE THROW GAP

13

using high speed disc saws safely Comments and Instructions cont.

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

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

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

FIGURE 13: SAW BLADE ENTRANCE AND EXIT SPACE

14

using high speed disc saws safely Comments and Instructions cont.

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

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

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

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

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

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

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

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

Do not over speed the blade rpm.

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

Do not neglect tooth fastening inspection, maintenance and replacement.

Do not neglect to repair worn or damaged saw housings.

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

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

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

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

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

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

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

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

Do not select and operate heads that throw rearward.

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

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

15

using high speed disc saws safely

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Tigercat 870B Feller Buncher SECTION 3 - LUBRICATION & MAINTENANCE JUNE 2003

CONTENTS - SECTION 3 AIR CLEANER MAINTENANCE ................................................................... 3.22 AIR CONDITIONING SYSTEM CHECKING SYSTEM ................................................................................ 3.21 CONDENSER CORE ................................................................................. 3.21 AIR INTAKE MAINTENANCE ........................................................................ 3.22 EFFICIENT REACH (ER) BOOM SYSTEM ..................................................... 3.9 EMERGENCY EXITS, CHECK MONTHLY ...................................................... 3.3 ENGINE AIR CLEANER MAINTENANCE ...................................................... 3.22 FILTER AND LUBRICATION SCHEDULE ........................................................ 3.7 FILTERS FUEL FILTER/WATER SEPARATOR ........................................................ 3.12 FUEL TANK STRAINER ............................................................................ 3.13 HYDRAULIC OIL RETURN FILTERS .......................................................... 3.17 HYDRAULIC OIL RETURN STRAINERS/DIFFUSERS ............................... 3.19 HYDRAULIC PRE-FILL OIL FILTER ........................................................... 3.16 PILOT CHARGE FILTER, MEDIUM PRESSURE ....................................... 3.14 SERVICING GUIDELINES FOR OIL FILTERS ........................................... 3.14 FIRE PREVENTION ........................................................................................ 3.3 FUEL SHUT-OFF VALVE ............................................................................. 3.13 GENERAL MAINTENANCE ............................................................................. 3.3 HYDRAULIC OILS ........................................................................................... 3.8 HYDRAULIC TANK ....................................................................................... 3.18 LUBRICATION SCHEDULE ............................................................................. 3.7 NEW MACHINE MAINTENANCE .................................................................... 3.2 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 SETTING PROCEDURES ......................... See SERVICE MANUAL PRESSURE SETTING VALUES ................................... See SERVICE MANUAL PREVENTIVE MAINTENANCE SCHEDULE ................................................... 3.2 PUMP DRIVE GEARBOX MAINTENANCE GUIDE ........................................ 3.10 SCHEDULED MAINTENANCE FREQUENTLY ............................................................................................. 3.4 8 HOURS .................................................................................................... 3.4 24 HOURS .................................................................................................. 3.4 125 HOURS ................................................................................................. 3.5 250 HOURS ................................................................................................. 3.5 500 HOURS ................................................................................................. 3.6 1000 HOURS ............................................................................................... 3.6 2000 HOURS ............................................................................................... 3.6 TORQUE CHART, GENERAL ....................................................................... 3.25 TORQUE SETTINGS, RECOMMENDED ....................................................... 3.24

Tigercat 870B Feller Buncher

Lubrication and Maintenance

PREVENTIVE MAINTENANCE SCHEDULE FOR 870B FELLER BUNCHER NEW MACHINE MAINTENANCE

*INITIAL PRE-DELIVERY INSPECTION:PERFORM THE INITIAL PRE-DELIVERY INSPECTION USING Tigercat FORM NUMBERS 5281 AND 5282; "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 5282; "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:~

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

All hydraulic connections Hose clamps All cylinder and boom pin retainers

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

Check swing bearing bolt torque Engine mounting bolts Pump mounting bolts

IMPORTANT

Track shoe bolts Track roller retaining bolts

BEFORE DRIVING MACHINE ENSURE THAT THE TRACK TENSION (SAG) IS SET CORRECTLY.

Track sprocket retaining bolts

TRACK SAG MAY BE SET LESS THAN SPECIFIED FOR SHIPPING PURPOSES.

Track drive gearbox mounting bolts Track drive motor mounting bolts

REFER TO SECTION 11 IN THE SERVICE MANUAL FOR THIS PROCEDURE.

Swing gearbox mounting bolts Cab securing bolts

OIL LOST FROM LEAKAGE

Any other loose nut, bolt or fitting 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 870B Feller Buncher

Lubrication and Maintenance

GENERAL CHECK EMERGENCY EXITS MONTHLY~

CAUTION ALL HANDLES, STEPS AND PLATFORMS MUST BE KEPT FREE OF GREASE, OIL, FUEL, MUD, SNOW, ICE AND FOREST DEBRIS. Clean around filler caps before checking or adding fluids.

Two alternate exit routes are provided: rear window emergency exit and skylight/ emergency exit. These are only to be used if the side door cannot be opened.

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

Clean around hydraulic fittings before breaking connection. Plug or cap immediately.

Refer to EMERGENCY EXIT MAINTENANCE GUIDE in SECTION 2 of the OPERATOR'S MANUAL for checking procedure.

Clean up spills as soon as possible.

Always release pressure in hydraulic tank Before breaking a connection.

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

Always use clean oil and containers.

Drain dirty oil while still warm.

Do not exceed recommended fluid levels.

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

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

Clean up oil spills on walking surfaces in engine enclosure immediately.

Before welding on machine, be sure the negative battery terminal and the speed control 25 pin connector in cab are disconnected.

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

Clean away all branches, bark and chips.

Clean up all traces of oil to avoid fires.

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

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

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

3. Read the fire suppression system manual and have the system serviced regularly by qualified personnel.

Always have a fire extinguisher at hand.

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

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

Also refer to the SAFETY section of this manual for additional information on how to prevent fires from starting on the machine.

Always install roof safety strut when working in engine compartment.

Clean fire suppression system sensors.

3.3

Tigercat 870B Feller Buncher

Lubrication and Maintenance

SCHEDULED MAINTENANCE FREQUENTLY:~ ‡ Lubricating cylinder pins and boom joints:1. Ensure machine is on level ground

• Check engine cooling air intake screens for possible restriction

2. Completely tilt felling head back

• Check for debris, snow and ice buildup on emergency exits and remove accumulation immediately.

3. Fully extend stick boom cylinder 4. Force heel of felling head onto ground

• ER Boom system:

5. While in this position lubricate all cylinder retaining pins and boom joints

Periodically, the main boom must be lifted up as far as it will go and then lowered to operating height in an area free from overhead obstructions in order to circulate hydraulic oil from the cylinders back through the cooler and filters. This oil does not circulate through the cooler or filters during normal horizontal motion and the oil does not get completely changed during normal vertical motion, so it is important that this procedure be followed at least once every hour.

NOTE: This procedure will allow grease to flow to the normally "loaded side" of the pin/bearing surfaces.

Clean:~ • Oil cooler, engine radiator and enclosure screens.

• Remove potentially damaging limbs or sticks.

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

EVERY 8 HOURS:~

• For loose nuts, bolts and fittings.

• Perform frequently maintenance

• Condition and tension of fan belts.

And in addition:~

• Visually check condition of tracks.

• Check engine coolant level

• Conduct an overall visual inspection.

• Check engine oil level

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

• Check pump drive gearbox oil level • Check pump drive gearbox PTO oil level in bottle • Drain water from fuel/water separator

EVERY 24 HOURS :~

• Check intake and discharge areas of engine air precleaner

• Perform "frequently" maintenance • Perform 8 hour maintenance

• Check air cleaner unloader valve

And in addition:~

• Check air filter resriction indicator

• Lubricate swing bearing; 1-fitting - 10 shots while swinging

• Check hydraulic oil level Lubricate:~ • Swing pinion; 1-fitting - 10 shots • ‡ Boom joints: Standard Boom; 6-fittings - purge Standard w/Tilt Link; 12-fittings - purge Efficient Reach System; 12-fittings - purge • ‡ Cylinders; boom, stick & tilt; Standard Boom; 8-fittings - purge Efficient Reach System; 10-fittings - purge

3.4

Tigercat 870B Feller Buncher

Lubrication and Maintenance

SCHEDULED MAINTENANCE EVERY 250 HOURS:~

EVERY 125 HOURS:~ • Perform "frequently" maintenance

• Perform frequently maintenance

• Perform 8 hour maintenance

• Perform 8 hour maintenance

• Perform 24 hour maintenance

• Perform 24 hour maintenance

And in addition check:~

• Perform 125 hour maintenance

• Return filter bypass light is NOT ON with engine running at high idle and oil flow when oil is at operating temperature

And in addition:~

• Return filter restriction gauge with engine running at high idle and oil flow

• Check all hydraulic pressures • Replace engine oil and filter.

• Replace engine fuel filter(s).

• Medium pressure pilot filter restriction indicator with engine running at high idle and oil flow

• Replace filter in fuel filter/water separator.

• Replace air intake primary element.

• Replace oil in pump drive gearbox.

• Track drive gearbox oil level with a level plug at the 9 O'Clock or 3 O'Clock position • Fluid level in batteries unless maintenance free • Engine rpm

• Lubricate pump drive gearbox input shaft spline; 1 fitting - 1 shot. - Fitting located in centre of gearbox between pumps.

• Replace oil in track drive gearboxes with one level plug at 6 O'Clock and the other at 9 O'Clock. DRAIN using 6 O'Clock position and FILL using 9 O'Clock position.

• Hydraulic pump and motor securing bolts • Torque tightening points as per new machine maintenance Visually check for damage to:~ • Main and stick booms • Tracks, track frames and carbody • Swing bearing area • Attachment Make repairs immediately Visually inspect for:~ • Frayed electrical wiring and hydraulic hoses NOTE: Neglecting the proper maintenance of these items can result in fire.

• Wear in any other components Clean/replace:~ • Inspect for debris buildup between radiator and oil cooler • Air conditioner re-circulation filter • Cab fresh air filter • Refer to diesel engine service manual and attachment manual for additional required maintenance at this scheduled time period.

3.5

Tigercat 870B Feller Buncher

Lubrication and Maintenance

SCHEDULED MAINTENANCE EVERY 500 HOURS:~

EVERY 1000 HOURS:~

• Perform frequently maintenance

• Perform frequently maintenance

• Perform 8 hour maintenance

• Perform 8 hour maintenance

• Perform 24 hour maintenance

• Perform 24 hour maintenance

• Perform 125 hour maintenance

• Perform 125 hour maintenance

• Perform 250 hour maintenance

• Perform 250 hour maintenance

And in addition:~

• Perform 500 hour maintenance

• Replace air intake safety element.

And in addition check:~

• Replace hydraulic oil pre-fill filter. †

• Fuel in-tank strainer

• Replace hydraulic oil return filters (in tank).

• Replace air cleaner unloader valve

• Replace hydraulic oil pilot pressure filter. †

• Accumulator pre-charge. See service manual.

• Check track rollers and idlers for oil leakage.

These components are filled with oil and considered maintenance free. If oil leakage is detected repair of component(s) will be necessary.

EVERY 2000 HOURS:~ • Replace turbocharger rubber inlet elbow and coupling - High temperatures in this area can cause the rubber to harden

Lubricate:~ • Door and cover hinges; 10 fittings - 1 shot

• Check ALL air intake tubing, rubber couplings and band clamps for signs of wear and leakage

• Roof and door cylinder pins apply oil liberally.

• Drain and refill hydraulic oil tank with recommended hydraulic oil. See "approved hydraulic oils"

• Other door hinges; apply oil liberally Check:~ • Torque on swing bearing and swing gearbox retaining bolts.

It is strongly recommended that a program of regular oil testing be used. Oil change intervals can be established from oil test results

• Torque on track drive gearboxes and motor mounting bolts.

• 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 870B Feller Buncher

Lubrication and Maintenance

Tigercat® Model 870B FILTER AND LUBRICATION SCHEDULE REFER TO Tigercat OPERATOR'S MANUAL FOR FURTHER INFORMATION

CHK

2

ENGINE OIL/FILTER

3 4 5

FUEL FILTER (ENGINE) FUEL/WATER SEPARATOR INTANK FUEL STRAINER

6 7

AIR INTAKE PRECLEANER AIR INTAKE PRIMARY ELEMENT

8

AIR INTAKE SAFETY ELEMENT

9

HYDRAULIC RESERVOIR

10 11 12 13

HYDRAULIC OIL PRE-FILL FILTER RETURN FILTERS, (IN TANK) PRESSURE FILTER, PILOT* PUMP DRIVE GEARBOX;

CUMMINS C

CHK

QTY

5

CHK

SEE ENGINE MANUFACTURER’S SERVICE MANUAL

1 1

REP REP

CHK

CHK

- SPLINE ADAPTERS LUBRICATION

CHK

D/R

50

BOOM,STICK AND TILT JOINTS: LUB - STANDARD - STANDARD WITH TILT LINK - EFFICIENT REACH (ER) SYSTEM BOOM, STICK AND TILT CYLINDERS: LUB - STANDARD - EFFICIENT REACH (ER) SYSTEM DOOR AND ROOF HINGES LUB DOOR CYLINDER PINS LUB FELLING ATTACHMENT " LITHIUM BASED EP2 GREASE CONTAINING MOLYBDENUM DISULFIDE

1

1 SHOT 6 1.5

LUB D/R

CHK LUB 24HR *** LUB

** ANTIFREEZE MUST MEET GM 6038M SPECIFICATIONS SEE ENGINE MANUFACTURER'S MAINTENANCE MANUAL † Use of filters other than genuine Tigercat replacement filters is not recommended.

870BLUBCHART.XLS R2 06/03

3.7

1

1 2 1

3.75

18

†† CHK

190

REP † REP REP †

CHK CHK

-OIL LEVEL

1

D/R

SWING PINION

20 21 22

18.9

60/40 ANTIFREEZE **

CHK

17

19

9.5

1 1

16

15

36

REP REP

DRN

- SPLINE ADAPTERS LUBRICATION INPUT SHAFT TRACK DRIVE GEARBOX; †† CHECK OIL WITH A LEVEL PLUG AT 9 O'CLOCK OR 3 O'CLOCK POSITION. TRACK ROLLERS AND IDLERS CHECK FOR OIL LEAKAGE SWING BEARING ***

14

2000 !

500 !

250 !

CHANGE COOLANT EVERY 2 YEARS REP

USG

COOLING SYSTEM

REMARKS/LUBRICANT

LITRE

1

125 !

8!

DESCRIPTION

CAPACITY

1000 !

SERVICE POINT NO.

SERVICE EVERY

7.6

2

1

DRAIN TANK, CLEAN OR REPLACE AS NECESSARY CLEAN BOWL AS REQUIRED EVERY 8 HOURS; CHECK FILTER RESTRICTION INDICATOR WITH ENGINE RUNNING. CLEAN UNLOADER VALVE. REPLACE UNLOADER VALVE EVERY 1000 HOURS. DRAIN AND REFILL AS REQ’D BY SEASONAL OIL CHANGE SEE APPROVED HYDRAULIC OILS* *Tigercat RECOMMENDS REGULAR USE OF AN OIL TESTING PROGRAM.

*CHECK RESTRICTION INDICATOR CHECK OIL LEVEL AT SIGHT GAUGE FILL WITH MIL-L-2105C OR API-GL-5 BELOW -10°F (-23°C) USE 75W-90 UP TO 100°F (38°C) USE 75W-90 ABOVE 100°F (38°C) USE 75W-90 CHECK PTO (POWER TAKE OFF) OIL LEVEL IN RESERVOIR BOTTLE FILL WITH MIL-L-2105C OR API-GL-5

1

LITHIUM BASE EP2 GREASE " FILL WITH S 75W-90 (SPEC) RECOMMENDED SYNTHETIC GEAR OIL FOR SEVERE DUTY APPLICATIONS

1

IF LEAKING REMOVE AND REPAIR FILL WITH SAE 30 OR 40 GREASE WHILE SWINGING *** EVERY 24 HOURS LITHIUM BASE EP2 GREASE " GREASE WHILE SWINGING LITHIUM BASE EP2 GREASE " LITHIUM BASE EP2 GREASE "

10 SHOTS

1

10 SHOTS

1

PURGE 6 12 12

LITHIUM BASE EP2 GREASE " 8 10 12 LITHIUM BASE EP2 GREASE " 1 SHOT 4 APPLY OIL LIBERALLY LUBRICATE SEE MANUFACTURER'S MAINTENANCE SCHEDULE PURGE

LEGEND: CHK - CHECK DRN - DRAIN D/R - DRAIN AND REFILL LUB - LUBRICATE REP - REPLACE

Tigercat 870B 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 swing gearbox and brake.

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

®

Tigercat

HYDRAULIC OIL OPERATING RANGE (Not suitable for axle applications)

OPERATING TEMP. RANGE LOWEST START-UP TEMP.

HYDRAULIC OIL TEMPERATURE -40

OIL TYPE

-40

-30 -20

-20 0

-10

0 20

10 40

20 60

30 80

40

50

60

70

100

120

140

160

80 180

90 200

100

°C 220°F

CITGO MYSTICK HVI 32 MYSTICK HVI 46 MYSTICK HVI 68 CHEVRON RYKON PREMIUM 32 RYKON PREMIUM 46 RYKON PREMIUM 68 ESSO / EXXON UNIVIS N22 UNIVIS N32 UNIVIS N46 UNIVIS N68 IRVING OIL HYDRAULIC LP 22 HYDRAULIC LP 32 HYDRAULIC LP 46 HYDRAULIC LP 68 MOBIL MOBIL DTE 12M (ISO 22) MOBIL DTE 13M (ISO 32) MOBIL DTE 15M (ISO 46) MOBIL DTE 16M (ISO 68) PETRO-CANADA HYDREX MV 22 HYDREX MV 36 HYDREX MV 60 SHELL TELLUS T22 TELLUS T32 TELLUS T46 TELLUS T68 TEXACO RANDO HDZ 22 RANDO HDZ 32 RANDO HDZ 46 RANDO HDZ 68

CAUTION

OPERATING MACHINE OUTSIDE LIMITS SHOWN WILL RESULT IN FAILURE OF HYDRAULIC COMPONENTS

5168AR03

3.8

Tigercat 870B Feller Buncher EFFICIENT REACH (ER) BOOM SYSTEM WARNING This machine may be equipped with an Efficient Reach (ER) boom system. Because of this, it may behave in an unexpected manner compared to a conventional boom system.

When performing maintenance procedures or setting up a machine equipped with an Efficient Reach (ER) boom system, the following points must be noted: The main and stick boom cylinder circuits are connected hydraulically. Thus, disconnecting a hydraulic line to a boom cylinder may cause either boom to move unexpectedly. The boom may also move unexpectedly if a port relief adjusting screw is unscrewed (counterclockwise) too far and the pressure drops below that which is required to hold the weight of the boom and head. Ensure that the head is resting squarely on a solid footing and the stick cylinders are fully extended, tank pressure is relieved and engine is shut off before disconnecting any hydraulic lines.

Before attempting to disconnect hydraulic hoses or perform work on the boom system, ensure that:(a) The machine is parked on level ground with the head sitting flat on the ground. (b) The stick cylinders are fully extended (fig. 1) or the hoist cylinder fully collapsed (fig. 2). (c) The tip of the stick boom supported .

For additional safety precautions refer to ER BOOM SYSTEM PRECAUTIONS in SECTION 1 OF THIS MANUAL. STICK CYLINDERS FULLY EXTENDED

• TIP OF STICK BOOM FULLY SUPPORTED 870B-02

ER. BOOM SYSTEM. FIG.1

HOIST CYLINDER FULLY RETRACTED

•

TIP OF STICK BOOM FULLY SUPPORTED 870B-03

ER. BOOM SYSTEM. FIG.2

3.9

Lubrication and Maintenance Also note that because of the hydraulic connection between the main boom and ER cylinders, the ER cylinder can overpower the stick cylinders under certain conditions, causing the stick boom to move unexpectedly. This most often occurs when setting the MAIN BOOM UP relief valve, causing the stick to extend, but it may also happen at other times if the relief settings are not correct. Ensure that all personnel and equipment are clear of the boom path and that there is sufficient overhead clearance for the head to rise before making any adjustments.

Tigercat 870B Feller Buncher PUMP DRIVE GEARBOX MAINTENANCE GUIDE

Lubrication and Maintenance RESERVOIR BOTTLE

••

INTERNAL LUBRICATION The internal components of the pump drive gearbox are "splash" lubricated by the action of the gears when turning. It is very important to maintain the correct level of oil in the gearbox at all times. A pump drive oil level dipstick is provided easy access. The oil level must be checked with oil hot but always wait at least 5 minutes after stopping engine before checking oil level.

PUMP DRIVE GEARBOX OIL LEVEL DIPSTICK

••

LUBRICANT FEED LINES

RESERVOIR BOTTLE

870B-25

PUMP PAD SPLINE LUBRICATION The three pump mounting adapter pads on this gearbox each incorporate a lubrication port to allow the splines and couplings to receive lubricant. The lubricant, (see chart) is stored in a reservoir bottle and is gravity fed through three hoses connected to the bottom ports of the adapters pads. On later machines three additional hoses connected to the top adapter ports vent the lubrication lines back to the top of the reservoir bottle.

BREATHER

•

••

RESERVOIR BOTTLE

870B-33

••

PUMP DRIVE GEARBOX OIL LEVEL DIPSTICK

The oil in the gearbox should be changed at the specified time intervals in the lubrication schedule chart or whenever the oil shows traces of dirt or effects of high temperature evidenced by discoloration or strong odour. Always drain oil while still warm and examine for contamination of metal particles which if present could indicate worn gear teeth or imminent bearing failure.

EXTERNAL DRAIN LINE

•

LUBRICANT FEED LINES

VENT RETURN LINES (LATER MACHINES ONLY)

••

••

870B-38

RESERVOIR BOTTLE (LATER MACHINES) OIL FILL PLUG

•

870B-32

PUMP DRIVE GEARBOX OIL FILL LOCATION

3.10

Tigercat 870B Feller Buncher

Lubrication and Maintenance

GREASE FITTING PUMP DRIVE GEARBOX

SHAFT SEAL

INPUT SHAFT

870B-36

•• •• • •••

INPUT SHAFT LUBRICATION

INPUT SHAFT LUBRICATION The input shaft spline and mating spline on the flexible drive plate are grease lubricated. A grease fitting is installed in the end of the input shaft. The grease fitting is located in between the centers of the three pump mounting pads and is accessible from the front of the gearbox.

Refer to FILTER AND LUBRICATION SCHEDULE and SCHEDULED MAINTENANCE in THIS SECTION for the oil and grease specifications, quantities and frequency.

3.11

Tigercat 870B Feller Buncher FILTERS - REMOVE AND REPLACE

Lubrication and Maintenance FUEL FILTER/WATER SEPARATOR

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.

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

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

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.

PRIMING PUMP

870B-21

FUEL FILTER/WATER SEPARATOR

WATER SEPARATOR BOWL

• DRAIN TAP

870B-20

•

FUEL FILTER/WATER SEPARATOR

Changing the filter: 1. Park machine on level ground with felling head resting on the ground.

2. Open engine enclosure doors fully and install roof safety strut.

3. Stop engine. Turn battery disconnect switch to the OFF position.

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

5. Place a suitable container below to catch the spilt of fuel.

3.12

Tigercat 870B Feller Buncher

Lubrication and Maintenance

6. Wearing face protection (in case of a fuel squirt) turn OFF the fuel shut-off valve and unscrew the old filter. The fuel shut-off valve is located on the right side fuel tank suction line located at the base of the tank.

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.

CLEANOUT COVERS

•

FUEL TANK SHUT-OFF VALVE 7. Remove and discard the small 1” I.D. gasket from the threaded extension on the filter head.

870B-22

870B-15

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

•

FUEL TANK CLEANOUT COVERS

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

1. Park machine on level ground with felling head resting on the ground.

9. Clean the water sediment bowl.

2. Open engine enclosure doors fully and install roof safety strut.

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

3. Stop engine. Turn battery disconnect switch to the OFF position.

11. 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.

4. Drain the fuel tank. (two plugs on bottom drain right and left sides of tank) 5. Remove the round fuel tank cleanout cover plate and “O” ring from the access hole. Note that the fuel strainer is located just inside the right hand cleanout cover.

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

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

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

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

14. 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.

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

15. Turn the fuel shut-off valve ON, prime fuel system with push button primer pump located on the fuel filter mounting head, start the engine and check for leaks.

9. Reinstall the strainer using the hex on end.

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

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

3.13

Tigercat 870B Feller Buncher

Lubrication and Maintenance

HYDRAULIC FILTER SERVICING GUIDELINES

MEDIUM PRESSURE CHARGE PILOT FILTER CLOG INDICATOR SIGHT GLASS

IMPORTANT

NEVER PRE-FILL ANY HYDRAULIC FILTERS ON 200, 700, 800 AND 1000 SERIES MACHINES NEVER PRE-FILL CHARGE PRESSURE FILTERS ON 600 SERIES SKIDDERS

•• •

FILTER CLOG INDICATOR

CHARGE PILOT FILTER

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.

MEDIUM PRESSURE CHARGE PILOT FILTER There is a medium pressure charge pilot filter mounted to the base of the charge/pilot/filter manifold. The filter receives hydraulic oil from the charge pump. The charge pump is a gear pump driven from the power take-off of the main pump and supplies pilot oil via the filter and the charge/pilot/filter manifold to the pilot system.

870B-16

ALWAYS PRE-FILL DUAL HEAD HYDRAULIC FILTERS ON 600 SERIES SKIDDERS

Mounted on top of the manifold is a clog indicator. Under normal operating conditions (or when the hydraulic system is shut down) the indicator will show GREEN. When a pressure differential of 50 psi exists across the filter, the indicator will show RED, indicating a clogged filter.

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.

This condition could happen during cold startups, but as the oil warms up the indicator will automatically reset to GREEN. A “Clogged” condition will result in low pilot pressure. If a loss of controls or slow response occurs, filter element may need to be changed.

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

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.

3.14

Tigercat 870B Feller Buncher

Lubrication and Maintenance

AIR VENT VALVE

•

AIR VENT BALL VALVE Changing the filter: 870B-37

1. Park machine on flat ground with felling head resting on the ground and stop engine.

2. Turn BATTERY DISCONNECT SWITCH to ‘OFF’ position.

3. Release air from the hydraulic reservoir by opening the air vent ball valve.

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

5. Place a suitable container below to catch any spilt oil.

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

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

8. The new filter has an attached gasket. Apply hydraulic oil to the gasket surface.

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

10. DO NOT Prefill the filter*. Lubricate any new o-rings and seals with clean hydraulic and install the new filter element.

11. Close air vent ball valve.

13. Start the engine and check for leaks. *Refer to IMPORTANT note HYDRAULIC FILTER SERVICING GUIDELINES on PREVIOUS PAGE.

3.15

Tigercat 870B Feller Buncher

Lubrication and Maintenance

HYDRAULIC PRE-FILL OIL FILTER

•

There is a hydraulic oil pre-fill filter installed in the fill line to filter oil prior to entering the hydraulic tank. For service and replacement intervals see SERVICE AND LUBRICATION CHART in THIS SECTION.

FILTER HEAD

• GASKET

•

FILTER ELEMENT

SQUARE SECTION GASKET INSTALLATION FILTR_SEALS 2

#

Square Section Gasket Remove used gasket and clean groove in head.

Apply clean oil to new gasket surfaces.

Install new gasket into groove in filter head.

Do not prefill filter *. Screw on new filter until gasket makes contact with filter head.

Tighten filter an additional 3/4 turn.

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

HYDRAULIC PRE-FILL 870B-27 OIL FILTER Changing the filter: 1. Park machine on level ground with felling head resting on the ground. Stop engine. The prefill filter is accessed through the right hand engine door.

$

'O' Ring Gasket FILTER HEAD

• •

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

GASKET

•

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

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

FILTR_SEALS 2

FILTER ELEMENT

'O' RING GASKET INSTALLATION

Remove used gasket and clean gasket seat in head.

Apply clean oil to new gasket surfaces.

6. The new Tigercat filter is supplied with two gaskets enclosed, examine the filter head closely to determine which gasket should be used and follow the instructions to ensure proper installation.

Install new gasket on inside lip of filter.

Do not prefill filter *. Screw on new filter until gasket makes contact with filter head.

Tighten filter an additional 3/4 turn.

Tighten filter until top edge makes metal to metal contact with filter head. (approximately 1 1/2 additional turns after gasket contact) DO NOT use bottom nut for filter installation or damage/leakage may result. Bottom nut is to assist in filter removal only.

7. Start the engine and check for leaks. *Refer to IMPORTANT note HYDRAULIC FILTER SERVICING GUIDELINES on PREVIOUS PAGE.

3.16

Tigercat 870B Feller Buncher

Lubrication and Maintenance

HYDRAULIC OIL RETURN FILTERS There are two replaceable filters housed in the filter box. The filter box is a sealed compartment within the hydraulic reservoir.

9. Drain oil from the tank until the top of both return tubes are visible in bottom of filter box. See illustration on the next page.

10. Change filters, reinstall bypass valves, retaining springs and covers. Use a NEW 'O' ring to seal filter cover if 'O' ring has hardened or sustained damage. Install air bleed hoses.

11. Close air vent ball valve.

FILTER RESTRICTION GAUGE

145-23AY

FILTER RESTRICTION PRESSURE SWITCH

REPLACEABLE FILTERS (2 PLACES)

HYDRAULIC OIL RETURN FILTERS

•

The filters should be checked/changed at the intervals specified in the LUBRICATION AND MAINTENANCE SCHEDULE in SECTION 3 of THIS MANUAL. If the FILTER BYPASS* warning light comes on between scheduled maintenance intervals, STOP THE MACHINE and change these filter elements.

• •

O-RING

*NOTE: FILTER BYPASS warning light may come on if oil is not brought up to temperature after cold start ups. Refer to MACHINE PREPARATION in SECTION 2 of the OPERATOR'S MANUAL.

•

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

ROUND ACCESS COVER

• •

•

Changing the filters: REUSABLE STRAINERS/ DIFFUSERS (3 PLACES)

1. Park machine on level ground with felling head resting on ground.

2. Position upper frame to allow access to the drain plug in the bottom of hydraulic reservoir.

DRAIN PLUG

•

3. Open engine enclosure doors and install roof safety strut.

4. Turn BATTERY DISCONNECT SWITCH to the 'OFF' position.

870B-04

HYDRAULIC OIL TANK

12. On earlier machines

5. Release air from tank by opening air vent ball valve.

Pressurize tank to 3 psi using hand fill pump: Remove plug from end of fill hose and operate hand pump until a gauge reading of 3 psi is obtained. Loosen one of the air bleed hoses to allow air to escape from the filter box. Tighten air bleed hose and continue to pressurize tank.

Repeat until clean, air-free oil emerges from air bleed hose. Replace plug on fill hose. Once engine is running, pressure in tank will be maintained by turbo air from the engine.

6. Loosen and slowly disconnect one of the air bleed hoses from the top of one of the filter covers to allow oil in filter box to drain into the lower part of the tank.

7. Remove both hoses from filter covers.

8. Remove filter covers and filter bypass valves.

Continued on page 19

3.17

Tigercat 870B Feller Buncher

Lubrication and Maintenance •

AIR BLEED CONNECTION

FILTER BOX

• •

FILTER COVER

•

'O' RING

BYPASS VALVE

FILTER

• FILTER

RESERVOIR

VENT BALL VALVE, AIR VENT

FILTER BOX HYD. OIL FILL PORT

• •

•

FILTER BOX

•

RESERVOIR

•

DRAIN TANK TO BELOW THIS LEVEL TO PREVENT CONTAMINATED OIL FROM FLOWING INTO RETURN TUBES SECONDARY SIGHT GAUGE\LOW LEVEL SENDER RETURN TUBES WITH STRAINERS

ACCESS COVERS WITH 'O' RING SEAL

•

DRAIN PLUG

• •

• •

• •

PUMP CASE DRAIN AND FILTER BOX AIR EXHAUST OIL HEATER (OPTIONAL)

CROSS SECTION 'A'-'A' 870B-05

AIR COMPRESSOR (LATER MACHINES)

•

•

STRAINER SUCTION TUBES

•

•

• •

•

•

SIGHT GAUGE/ LEVEL SENDER WITH OIL TEMP GAUGE

SUCTION TUBES

• • •

•

• DRAIN PLUG

HYDRAULIC TANK

12. On later machines with compressor pressurizing system: Pressurize tank by turning the key switch to RUN position, PRESS and HOLD the tank pressurization switch in the cab in the ON position until a pressure reading of 6 psi. is indicated on the hydraulic tank pressure gauge. Loosen one of the air bleed hoses to allow air to escape from the filter box. Repeat until clean, air-free oil emerges from air bleed hose.

13. Add hydraulic oil up to FULL mark on tank sight gauge using hand fill pump.

NOTE: Changing filters tends to aerate the hydraulic oil. For maximum pump life, the machine should sit for one hour after servicing to allow entrained air to escape prior to applying working pressures to the pumps.

3.18

Tigercat 870B Feller Buncher

Lubrication and Maintenance

HYDRAULIC OIL RETURN STRAINERS/DIFFUSERS There are three reusable strainers/diffusers housed in the hydraulic tank, one on the case drain return port and two on the return tubes. The strainers should be inspected whenever the hydraulic tank is drained. See SCHEDULED MAINTENANCE in THIS SECTION. For service and replacement intervals see SERVICE AND LUBRICATION CHART in THIS SECTION.

17. Bleed air from the main, track and saw pumps by removing the case drain hoses at each pump connection. Install plugs in hose ends.

18. Continue filling hydraulic tank using hand fill pump. Reconnect case drain hoses to pumps when oil is seen coming from the pump case drain ports. It is important that all air is evacuated from the pumps.

19. Fill hydraulic tank up to full mark on sight gauge using hand fill pump.

CHANGING OR CLEANING THE STRAINER: This should be performed in the event of a pump failure or hydraulic oil contamination.

20. Close air vent ball valve.

Continued on page 20

1. Park machine on level ground with felling head resting on the ground.

2. Position upper frame to allow access to the drain plug in the bottom of hydraulic reservoir.

3. Stop engine.

4. Open engine enclosure doors and install safety strut.

5. Turn BATTERY DISCONNECT SWITCH to the 'OFF' position.

6. Release the pressure in the hydraulic tank by opening the air vent valve.

7. Disconnect the wires from the two sensors located on the access cover.

8. Drain the hydraulic tank via a drain plug in the bottom of the tank. Access to this plug requires removal of a cover plate on the under side of the upper frame.

9. Remove the round access cover plate and 'O' ring.

10. Before removing the strainers, clean any debris from the bottom of the tank and wipe it clean.

11. Remove the three hydraulic oil return strainers using the hex on the end of strainer. Carefully clean the strainers (they may be damaged by rough handling).

12. Check for a buildup of foreign materials where the strainers screw onto the pipes and cover plate.

13. Reinstall the strainers using the hex on end.

14. Reinstall access cover plate with a NEW “O” ring.

15. Connect sensor wires to sensors on access cover.

16. Add hydraulic oil to tank using hand fill pump.

3.19

Tigercat 870B Feller Buncher

Lubrication and Maintenance

Continued from page 19

21. On earlier machines: FILTER RESTRICTION GAUGE

Continue to operate hand pump until a gauge reading of 3 psi is obtained. Loosen one of the air bleed hoses to allow air to escape from the filter box. Tighten air bleed hose and continue to pressurize tank. Repeat until clean, air-free oil emerges from air bleed hose. Replace plug on fill hose.

FILTER RESTRICTION PRESSURE SWITCH

REPLACEABLE FILTERS (2 PLACES)

21. On later machines with compressor pressurizing system:

• •

Continue to operate hand pump until a gauge reading of 2 to 3 psi is obtained. Loosen one of the air bleed hoses to allow air to escape from the filter box. Tighten air bleed hose and continue to pressurize tank by turning the key switch to RUN position and pressing and holding the tank pressurization switch in the cab in the ON position until a pressure reading of 6 psi. is indicated on the hydraulic tank pressure gauge. Again loosen one of the air bleed hoses to allow air to escape from the filter box. Repeat until clean, air-free oil emerges from air bleed hose. Replace plug on fill hose.

22. Recheck oil level and add hydraulic oil up to FULL mark using hand fill pump.

NOTE: Changing strainers and filters and replacing the hydraulic oil tends to aerate the oil.

For maximum pump life, the machine should sit for 1 hour after servicing to allow entrained air to escape from the oil prior to applying working pressures to the pumps.

•

O-RING

•

3.20

• •

• REUSABLE STRAINERS/ DIFFUSERS (3 PLACES)

DRAIN PLUG

• 870B-04

ROUND ACCESS COVER

HYDRAULIC OIL TANK

Tigercat 870B Feller Buncher CHECKING THE AIR CONDITIONING SYSTEM

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

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

A/C SYSTEM TOTAL CAPACITIES R134a REFRIGERANT

PAG OIL (polyalkylene glycol)

3 LBS. 0 OZ.

7 OZ.

CAUTION

The compressor and charge valves are accessed on the right side of the engine. The receiver dryer is mounted to the back of the cab inside the engine compartment.

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

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

CHECK A/C CONDENSER CORE

Use checklist to maintain system between service intervals. a. Check and adjust compressor drive belt tension.

•

b. Check re-circulating and fresh air filters in operator's cab. Refer to SECTION 2 of the OPERATOR'S MANUAL. 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 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.

For additional information refer to the Tigercat A/C SERVICE MANUAL part number 18795A, available from our parts and service depatment.

3.21

235-14

CHECK A/C CONDENSER CORE

Tigercat 870B Feller Buncher AIR CLEANER MAINTENANCE

Lubrication and Maintenance AIR CLEANER

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 discharge port area and that the rotor spins freely AS THE AIR SPINS, CENTRIFUGAL FORCE SEPARATES FOREIGN MATERIALS FROM THE CLEAN AIR

PRECLEANER

•• •• • FILTER RESTRICTION INDICATOR

•• 378-11A

AIR CLEANER UNLOADER VALVE

ENGINE AIR INTAKE

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

• • • • 205-19AC

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

AIR CLEANER PRIMARY ELEMENT

ONLY THE PURIFIED AIR GOES TO THE AIR FILTER

PRECLEANER OPERATION

205-22AC

AIR CLEANER SAFETY ELEMENT

important that the elements be serviced correctly and at proper servicing intervals.

DISCHARGE PORT AREA

AIR CLEANER UNLOADER VALVE This rubber valve on the tube of the air cleaner housing should be checked before every shift (8 hrs). If this valve is missing, damaged or has turned hard, it will cause the air cleaner to become ineffective. The valve should be replaced every 1000 Hours.

218-21B

Remove the unloader valve from the tube of the air cleaner housing. A good valve is soft and flexible.

Check and clean the valve. If it was plugged, then check the filter elements as they may need to be replaced as well. Reattach the valve to the tube.

The valve should suck closed at about 1/3 of full throttle. When operating in high dust conditions

PRECLEANER

AIR CLEANER The air cleaner on this machine uses 2 filter elements, a primary element and a safety element.

To ensure maximum engine protection, it is 3.22

Tigercat 870B Feller Buncher

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

UNLOADER VALVE

The most common and most damaging air intake servicing problems are: OVER SERVICING

•

235-4

AIR CLEANER UNLOADER VALVE

this valve should be checked and squeezed frequently to release dust buildup.

FILTER RESTRICTION INDICATOR

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 hydraulic oil or diesel engine filters.

IMPROPER SERVICING 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 is removed for replacement. The safety element does reduce this risk but it should also be replaced at every third primary element change.

376-11A

FILTER RESTRICTION INDICATOR

FILTER RESTRICTION INDICATOR

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

A filter restriction indicator is connected to the outlet side of the air filter. Service to the air filter is required 2. Avoid dislodging dust from filter element(s) by gently pulling the element off the outlet tube. when the indicator shows RED. This indicator provides a continuous reading whether the engine is 3. Always clean the sealing surface of the outlet tube running or is shut down. After servicing the filter, before inserting a new filter element. reset the indicator by pressing the reset button.

4. Always clean the inside of the outlet tube.

INTAKE TUBING AND JOINTS 5. Check your old filter. It can help you detect foreign Replace turbocharger rubber inlet elbow and coupling material on the sealing surface that is causing - High temperatures in this area can cause the rubber leakage. to harden.

NOTE: Filter elements should never be cleaned and Check ALL air intake tubing, rubber couplings and reused. Cleaning causes dust to bypass the filter band clamps for signs of wear and leakage. and be deposited on the inner surface of the filter RUBBER ELBOWS media. The dust is then drawn directly into the AND TUBING engine.

6. Inspect the new filter for damage.

• ••

870B-D17

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

8. Check connections and ducts for 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.

INTAKE TUBING AND JOINTS 3.23

Tigercat 870B Feller Buncher

Lubrication and Maintenance

TORQUE CHART LOCATION

THREAD DIAMETER

Cylinder, Hoist and Stick[ER only] (6336B) Piston nut Cylinder end cap bolts Cylinder, Stick and Tilt [non-ER only] (6337B) Piston nut Cylinder end cap bolts

TORQUE (LUBRICATED) lbf-ft Nm

M14

4159 126

5640 171

M16

3522 197

4780 267

Boom joint pin bolts

3/4" UNC

282-310

393-420

Cab securing bolts

1" UNC

682-750

925-1016

Swing bearing Swing bearing bolts

7/8" UNC

450-500

620-680

Swing gearbox mounting bolts

5/8" UNC

160-175

215-235

Engine mounting - Cummins 'C' Engine Bolts, bracket/mount to chassis Bolts, bracket to engine, front Bolts, bracket to engine, rear

7/8" UNC 7/16" UNC M12

450-500 52-57 80

620-680 71-77 109

Pump drive Drive plate to flywheel Bell housing to engine

3/8" UNC M10

33-36 47

45-49 63

M24 1" UNC M20 M20 M12

T/T* 680-750 380 380 95

T/T* 922-1017 515 515 130

Undercarriage Track shoe bolts Roller mounting bolts Sprocket bolts Gearbox mounting bolts Drive motor mounting bolts

*T/T represents Torque-turn, this is a method of torquing the track shoe bolts which is fully described in SECTION 11 of the Tigercat SERVICE MANUAL. Torque values pertaining to the engine and attachment are provided in the appropriate manuals.

870BTORQUECHART.XLS

3.24

Tigercat 870B Feller Buncher

Lubrication and Maintenance

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

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

IMPERIAL

GRADE 5 BOLTS

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

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

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

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

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

METRIC

SIZE

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

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

M6 M8 M10

4.8 12 23

3.5 8.5 17

6 15 29

4.5 11 21

9 22 43

6.5 16 32

11 28 55

8.5 20 40

13 32 63

9.5 24 47

17 40 80

12 30 60

15 37 75

11.5 28 55

19 47 95

14.5 35 70

M12 M14 M16

40 63 100

29 47 73

50 80 125

37 60 92

75 120 190

55 88 140

95 150 240

70 110 175

110 175 275

80 130 200

140 225 350

105 165 225

130 205 320

95 150 240

165 260 400

120 190 300

M18 M20 M22

135 190 260

100 140 190

175 240 330

125 180 250

260 375 510

195 275 375

330 475 650

250 350 475

375 530 725

275 400 540

475 675 925

350 500 675

440 625 850

325 460 625

560 800 1075

410 580 800

M24 M27 M30

330 490 675

250 360 490

425 625 850

310 450 625

650 950 1300

475 700 950

825 1200 1650

600 875 1200

925 1350 1850

675 100 1350

1150 1700 2300

850 1250 1700

1075 1600 2150

800 1150 1600

1350 2000 2700

1000 1500 2000

M33 M36

900 1150

675 850

1150 1450

850 1075

1750 2250

1300 1650

2200 2850

1650 2100

2500 3200

1850 2350

3150 4050

2350 3000

2900 3750

2150 2750

3700 4750

2750 3500

ISSUE 3 800

3.25

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

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

Tigercat 870B Feller Buncher

Lubrication and Maintenance

3.26

Tigercat 870B Feller Buncher

SECTION 4 - HYDRAULIC SYSTEM CONTENTS - SECTION 4

JUNE 2003

ENGINE ANTI-STALL VALVE ................................................................................................................. 4.7 HIGH PRESSURE LIMITING CONTROL VALVE SET LOAD SENSE RELIEF VALVE .................................................................................................. 4.24 HYDRAULIC OIL TANK DESCRIPTION .................................................................................................................................... 4.4 FILTER/STRAINER SERVICE NOTE .................................................................................................. 4.5 TANK PRESSURIZATION SYSTEM. SEE ALSO SECTION 2 IN OPERATOR'S MANUAL HYDRAULIC PUMPS CHARGE/PILOT, WRIST AND CLAMPS PUMP ................................................................................. 4.7 MAIN PUMP ........................................................................................................................................ 4.6 SAW PUMP ......................................................................................................................................... 4.7 TRACK DRIVE PUMPS ....................................................................................................................... 4.7 HYDRAULIC SYSTEM OPERATION CIRCUIT DESCRIPTION ................................................................................................................... 4.13 FLOW ON DEMAND AND LOAD COMPENSATION ........................................................................ 4.13 MAIN HYDRAULIC SYSTEM ............................................................................................................... 4.2 MARGIN PRESSURE .......................................................................................................................... 4.6 MARGIN PRESSURE, SET ............................................................................................................... 4.23 PILOT CIRCUIT ................................................................................................................................... 4.3 SAW CIRCUIT ..................................................................................................................................... 4.2 SWING SYSTEM ................................................................................................................................. 4.2 TRACK DRIVE SYSTEM ..................................................................................................................... 4.3 WRIST AND CLAMPS CIRCUIT ......................................................................................................... 4.2 HYDRAULIC TANK ................................................................................................................................. 4.4 LOAD SENSING BASIC DESCRIPTION ......................................................................................................................... 4.9 BASIC PRINCIPLES ............................................................................................................................ 4.8 OPERATING TIPS ............................................................................................................................. 4.11 SET LOAD SENSE RELIEF VALVE .................................................................................................. 4.24 SET MARGIN PRESSURE ................................................................................................................ 4.23 MAIN CONTROL VALVE/MANIFOLD BOOM FUNCTIONS SPOOL SECTIONS .........................................................................................

CONTROL VALVE SECTIONS ..........................................................................................................

CONTROL VALVE SPOOL OPERATION .........................................................................................

HIGH PRESSURE LIMITING CONTROL VALVE ..............................................................................

MAIN CONTROL VALVE DESCRIPTION ..........................................................................................

PORT RELIEF AND ANTICAVITATION VALVE ................................................................................

ADJUSTING PROCEDURE ...........................................................................................................

SWING DRIVE MOTOR SPOOL SECTIONS ....................................................................................

MAIN PUMP CONTROLLER ......................................................................................................... 4.7,

4.14 4.15 4.17 4.22 4.14 4.16 4.16 4.14 4.23

PRESSURE SETTINGS ...................................................................................................................... 4.25 SCHEMATIC DIAGRAMS HIGH PRESS. LIMITING CONTROL ................................................................................................. 4.22 LOAD SENSING (FLOW ON DEMAND) ............................................................................................. 4.8 LOAD SENSING SYSTEM CIRCUIT DIAGRAM ............................................................................... 4.12 MAIN PUMP ........................................................................................................................................ 4.7 MAIN VALVE WITH HIGH PRESS. LIMITING CONTROL ................................................................ 4.14

Tigercat 870B Feller Buncher HYDRAULIC SYSTEM OPERATION

Hydraulic system Swing system

The hydraulic system has five basic circuits;

This system utilizes dual bent-axis piston motors each with crossover relief valves. Only one pair of relief valves on one of the motor is used to control both motors. The motors are connected to dual, double reduction planetary gearboxes which provide a higher swing torque. This swing drive assembly provides variable swing speeds up to 7 rpm. A rotary manifold facilitates the hydraulic connection to the undercarriage of the vehicle and permits continuous 360 degree swing. Each swing drive gearbox incorporates a wet, multi-disc brake installed between the motor and gearbox. The dual swing brakes are controlled by a switch on the instrument panel. The brakes are spring-apply, hydraulic-release and will automatically apply whenever the pilot oil supply is shut off. For detailed description of the SWING system, refer to SECTION 15 of THIS MANUAL.

1. Variable displacement main hydraulic circuit with load sensing for the boom and swing functions.

2. Variable displacement circuit for the saw.

3. Fixed displacement circuit for the wrist and clamps functions.

4. Closed centre pilot circuit to supply oil for pilot system and charge pressure oil for track drive hydrostatic system.

5. Closed loop circuit with variable displacement pumps and motors for the track drive functions.

1. THE MAIN HYDRAULIC SYSTEM This a closed centre circuit utilizing a variable displacement axial-piston pump with load sensing and horsepower limiting control. The load sensing system ensures that the pump will deliver only the amount of oil that is required by an individual boom or swing function or combination of functions.

2. SAW CIRCUIT This open centre circuit uses a variabledisplacement pressure compensated piston pump which delivers oil to the variable displacement bent-axis piston motor on the saw through a saw control valve. The main saw control valve is pilot operated and controls the flow of hydraulic oil from the pump to the motor. A relief valve is installed in the inlet section of the main saw control valve.

This feature improves fuel economy and reduces heat generation because power is not wasted on excess pump flow that is not being used. Refer to LOAD SENSING in THIS SECTION. The horsepower limiting control ensures that the engine will not lug down below the full load rpm by reducing the output from the main hydraulic pump. For detailed description of ENGINE ANTI-STALL, refer to SECTION 9 of THIS MANUAL.

A solenoid operated pilot valve 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 saw ON or OFF. For detailed description of the SAW DRIVE, refer to SECTION 17 of THIS MANUAL.

The main control valves are pressure and flow compensated to provide independent and load independent operation for all functions. The control valves are mounted on a common supply/return base manifold. Two 'P' (pressure) ports on the back of the manifold receive supply oil from the main pump. The return oil from the main control valves exits the base manifold at two 'T' ports and 75 psi internal check valves. From there the oil passes through the oil cooler and then flows to the return filters in the hydraulic tank.

Boom cylinders All hoist, stick and tilt cylinders have cushions at both ends. All cylinder rods are ground, heat treated, chrome plated and polished.

4.2

Tigercat 870B Feller Buncher

Hydraulic system

3. WRIST AND CLAMPS/ACCUMULATING ARMS CIRCUIT This open centre circuit receives oil from one of two cartridges in a double gear pump driven off the PTO of the main pump. Three pilot operated spool sections on the wrist and clamps valve direct oil to the wrist, clamps and accumulating arms cylinders. For a full description of WRIST AND CLAMPS circuit, refer to SECTION 18 of THIS MANUAL. 4. PILOT CIRCUIT The closed centre pilot circuit receives oil from one of two sections in a double gear pump driven off the PTO of the main pump. A charge/pilot/filter manifold with an attached filter, divides the oil to serve the pilot system and also to supply charge pressure oil to both track drive motors. The manifold contains; (1) the pilot shut-off valve, (2) a pilot dump valve (operates during engine cranking at start up), (3) a filter bypass valve. The pilot relief valve (4) works in conjunction with a spring-biased blocking valve (5) (logic valve) to control the pilot pressure (450 psi) and the tank return function for this circuit. For a full description of this manifold and the pilot circuit, refer to in SECTION 5 of THIS MANUAL. 5. TRACK DRIVE SYSTEM The track drive system is a closed loop system with independant variable displacement piston pumps and high-torque, axial-piston hydraulic motors. The motors are mounted to a three stage planetary drive gearbox and each is completely housed within the width of the track shoes. The gearboxes include wet, multiple-disc, springapply, hydraulic-release brakes which automatically release when driving and apply when stationary. Independent control of each track permits counter rotation. For a detailed description of the TRACK DRIVE, refer to SECTION 11 of THIS MANUAL.

4.3

Tigercat 870B Feller Buncher

Hydraulic system •

AIR BLEED CONNECTION

FILTER BOX

• •

FILTER COVER

•

'O' RING

BYPASS VALVE

FILTER

• FILTER

RESERVOIR

VENT BALL VALVE, AIR VENT

FILTER BOX HYD. OIL FILL PORT

• •

•

FILTER BOX

•

RESERVOIR

•

DRAIN TANK TO BELOW THIS LEVEL TO PREVENT CONTAMINATED OIL FROM FLOWING INTO RETURN TUBES SECONDARY SIGHT GAUGE\LOW LEVEL SENDER

ACCESS COVERS WITH 'O' RING SEAL

•

DRAIN PLUG

• • •

• •

AIR COMPRESSOR (LATER MACHINES)

•

•

•

STRAINER

•

SUCTION TUBES

PUMP CASE DRAIN AND FILTER BOX AIR EXHAUST OIL HEATER (OPTIONAL)

CROSS SECTION 'A'-'A' 870B-05

•

•

•

RETURN TUBES WITH STRAINERS

•

•

SIGHT GAUGE/ LEVEL SENDER WITH OIL TEMP GAUGE

SUCTION TUBES

• • •

•

• DRAIN PLUG

HYDRAULIC TANK

HYDRAULIC OIL TANK

The reservoir is pressurized during operation:

Also refer to SECTION 2 of the OPERATOR'S MANUAL and SECTION 3 for additional information.

On earlier machines by thermal expansion as the hydraulic oil becomes warm during operation.

Located at the right of the machine, the hydraulic tank has a capacity of 50 U.S. gallons (190 litres).

The tank has two compartments; a filter box and a reservoir. The filter box, which is a sealed compartment within the reservoir, collects, filters and strains all the hydraulic oil as it returns back to the reservoir.

On later machine by an air compressor controlled by the hydraulic tank pressurization switch on the control panel. Refer to HYDRAULIC TANK PRESSURIZATION SYSTEM, LATER MACHINES in SECTION 2 of the OPERATOR'S MANUAL for additional information.

4.4

Tigercat 870B Feller Buncher

Hydraulic system An optional hydraulic oil heater can be installed for use in cold weather conditions.

FILTER RESTRICTION GAUGE

The hydraulic hand fill pump, at the right side of the machine adjacent to the tank, is used to add oil to the hydraulic oil tank via an oil filter.

FILTER RESTRICTION PRESSURE SWITCH

During normal operating conditions, the filter box is completely filled with oil. Any air present in the system will eventually enter the filter box and be evacuated through the air bleed return hose in the filter covers and discharged into the hydraulic reservoir. This return port, which has a reusable strainer connected to it, is also used to collect the pump 'case drain' return oil.

REPLACEABLE FILTERS (2 PLACES)

• • •

FILTER/STRAINER SERVICE NOTE O-RING

•

The filters should be checked/changed at the intervals specified in the LUBRICATION AND MAINTENANCE SCHEDULE in SECTION 3 of THIS MANUAL. If the FILTER BYPASS* warning light comes on between scheduled maintenance intervals, STOP THE MACHINE and change these filters. Refer to HYDRAULIC OIL RETURN FILTERS in SECTION 3 of this MANUAL.

ROUND ACCESS COVER

• •

*NOTE: FILTER BYPASS warning light may come on if oil is not brought up to temperature after cold start ups.

•

REUSABLE STRAINERS/ DIFFUSERS (3 PLACES)

DRAIN PLUG

• 870B-04

HYDRAULIC OIL TANK

SERVICE NOTE: Before disconnecting any hoses, release the pressure in the hydraulic tank by opening the air vent ball valve.

All return oil entering the tank, except for the main pump and track pumps case drain oil, passes through two replaceable filters housed in the filter box.

There is a bypass valve built in to each filter preset at 22 psi. which will open in the event the filter elements become restricted. A 15 psi. oil pressure switch installed through the wall of the tank into the filter box will activate the FILTER BYPASS warning light in the cab before this happens.

Reusable suction strainers situated at the bottom of the hydraulic reservoir screen oil prior to entering the pumps.

4.5

Tigercat 870B Feller Buncher

Hydraulic system

MAIN PUMP

R.H.TRACK DRIVE PUMP

•• POS. 'C'

•

•

POS. 'B' ENGINE

•• POS. 'A'

••

•

FLEX DRIVE COUPLING

•• PUMP DRIVE GEARBOX CHARGE/ CLAMPS/ WRIST PUMP

OIL DRAIN HOSE

•• L.H.TRACK DRIVE PUMP

870B-06

•

SAW PUMP

HYDRAULIC PUMPS

HYDRAULIC PUMPS

MAIN PUMP

All hydraulic functions are powered by five pumps mounted and driven off the pump drive gearbox.

Drive to the pump drive gearbox is from the engine via a flexible coupling.

The main pump is an axial-piston, variabledisplacement pump with load sensing, pressure cutoff and horsepower limiting controls.

The main pump, mounted on pad 'C' of the pump drive gearbox is a piston pump with load sensing and horsepower limiting controls which is used to power the swing drive and boom functions. Driven off the PTO of the main pump is the clamps/wrist/ charge pump. This is a gear pump which powers the wrist and clamps functions for the felling head but also provides the charge pressure to both track drive motors.

Mounted on pads 'A' and 'B' of the pump drive gearbox are the left and right track drive pumps.

These pumps are piston pumps and provide independant drive power to the track assemblies.

Driven of the PTO of the LEFT track drive pump is the pressure compensated piston saw pump.

When all of the control valves are in the neutral position the pump is destroked and the output is just sufficient to maintain a standby pressure of approx.

500 psi in the pump output line. The swashplate control piston is in a condition where the spring force, swashplate force and the control pressure forces are balanced.

MARGIN PRESSURE When a function control lever is moved, i.e. joystick, to activate a boom or swing function, Load Sense (LS) pressure increases to the point where it is equal to the work port pressure and it shifts the LS control valve.

The pump then adjusts its output volume until the pump output pressure exceeds the LS pressure by a small amount. This difference is known as margin pressure (differential pressure or Delta P).

Refer to SET MARGIN PRESSURE in THIS SECTION. 4.6

Tigercat 870B Feller Buncher ENGINE ANTI-STALL SOLENOID VALVE

PILOT PRESSURE PORT 'P' CONNECTION

Hydraulic system HIGH PRESSURE LIMITING CONTROL

HORSEPOWER CALIBRATION DO NOT ADJUST

MAIN VALVE MANIFOLD

• ••

'P' GAUGE TEST CONN.

•

•• • ••

••

••

L.S. GAUGE TEST CONN.

••

HIGH PRESSURE LIMITING CONTROL At this point the LS control valve shifts back to its previous condition and the swashplate control piston will be balanced with the pump output remaining constant until the pressure at the LS port changes. This is a dynamic condition with the swashplate angle changing constantly in response to the load fluctuations. The LS pressure is always equal to the highest work port pressure.

103-17A

PORT 'A' ANTI-STALL SIGNAL CONNECTION TO MAIN PUMP

TANK PORT 870B-D01

ENGINE ANTI-STALL VALVE

•• ••

NO FUNCTION DO NOT ADJUST

••

MAIN PUMP

MARGIN PRESSURE ADJUSTING SCREW

• ••

NOTE: If the machine controls are not responding as they should, i.e. boom is jerky or sluggish, the margin pressure setting may be out of adjustment.

• GAUGE TEST PORT 'A' ANTI-STALL SIGNAL PRESSURE PORT 'A' CONNECTION FROM ANTI-STALL VALVE 'LS' CONNECTION FROM MAIN VALVE 870B-D02

Also refer to ENGINE ANTI-STALL in SECTION 9 of THIS MANUAL. The pump is protected by a high pressure limiting control which is attached to the main control valve manifold. Refer to HIGH PRESSURE LIMITING CONTROL in THIS SECTION.

MAIN PUMP CONTROLLER (LS CONTROL)

TRACK DRIVE PUMPS For the operation and adjustments of this pump refer to SECTION 11 of THIS MANUAL. SAW PUMP For the operation and adjustments of this pump refer to SECTION 17 of THIS MANUAL. CHARGE/PILOT, WRIST AND CLAMPS PUMP The charge/pilot, wrist and clamps pump is a dual gear pump driven off the back of the main pump.

For detailed information on this pump, refer to SECTION 18 of THIS MANUAL.

830-15

MAIN PUMP SCHEMATIC

4.7

Tigercat 870B Feller Buncher LOAD SENSING

Hydraulic system

BASIC PRINCIPLES Figs. 1 & 2 Early hydraulic systems used a fixed displacement pump, with valves to control or adjust flow rates or speeds. This throttling or restricting pump flow to achieve control over the functions causes excess oil to flow over the relief valve. This results in wasting power and at the same time creates heat. SEE FIGS. 1 & 2.

FLOW

853SM18

W USED PRESSURE

FIG. 1

FIXED DISPLACEMENT PUMP

853SM16

FIG. 2

HP

Figs. 3 & 4 In an attempt to recover some of the wasted energy, variable volume pumps evolved. These pumps are power regulated or horsepower controlled and since they reduce the pumps output to maintain a constant system hp, oil flow over the relief valve is less, therefore reducing the wasted power losses and heat generation. SEE FIGS. 3 & 4.

WASTED WASTED

=CO NS

The power wasted in the horsepower control system is still considerable and still requires constant "throttling" by the operator if he wants the speeds to remain as selected.

TAN T

This system combines the energy saving benefits of flow on demand with load compensation at each work port. The compensator eliminates the need for operator flow adjustments (throttling).

SEE FIGS. 5 & 6.

FLOW

Figs. 5 & 6 The load control system was developed to address the problems outlined above.

WASTED WASTED

W USED PRESSURE

853SM19

HP REGULATED PUMP

FIG. 3

FIG. 4

853SM16

HP =C ON STA

FLOW

NT

∆p LS W USED PRESSURE

853SM17 FIG.5

LOAD SENSING (FLOW ON DEMAND) 4.8

FIG.6

853SM16

Tigercat 870B Feller Buncher

Hydraulic system

LOAD SENSING BASIC DESCRIPTION OPEN CENTRE VS. CLOSE CENTRE OPEN CENTRE SYSTEM:

853SM21

If the oil flowing to the motor or cylinder meets variable loads, this will upset the balance of oil going to the tank and the load. This causes the speed of the function to change with load changes.

853SM20

With the control valve in neutral all of the oil from the pump “bypasses” through the open center passage directly to tank. There is no backpressure created by the control valve to force oil into the workport (the workport is actually blocked off when the spool is in neutral, and unblocked when the spool begins to move).

853SM21 853SM20

This type of system exhibits the following characteristics;

When the control valve lever is moved to actuate a cylinder or motor, the open center passage is blocked off in proportion to the amount the lever is moved. This creates back pressure forcing oil into the valve workport to move the load.

1. If the load against the cylinder or motor changes, the speed of the function will change.

2. If the load increases on a boom cylinder, the boom will slow or stop. Moving the lever further will increase the pressure against the load, and when high enough, the load will begin to move again.

3. The maximum speed of the function is determined by the maximum flow of the pump.

853SM20

When the control valve lever is fully shifted to the maximum flow position the open center passage is completely blocked, and all of the pump flow is forced against the load.

4.9

Tigercat 870B Feller Buncher CLOSED CENTRE SYSTEM: Load sensing systems use variable flow pumps and only flow oil when required. Unlike the open centre system, the control valve does not have an open centre passage. When in neutral, no oil flows through the control valve to tank and the pump output flow is zero. The pump’s output flow is controlled by a “stroking piston” which is connected to the pump output, and to the valve’s workport or “load”. This sense line to the actual working load defines the system as load sensing.

The key component in the system below is the spring in the stroking piston. The pump’s output pressure must be 250 p.s.i. higher than the load pressure to compress the spring and reduce the flow of the pump. This 250 p.s.i. is the differential or margin pressure.

Hydraulic system point. The stroking piston will change the pump’s flow until pump pressure is 250 p.s.i. higher than load pressure.

In the figures below, note that even though the load pressure may change, (as illustrated by the extra restriction) the flow remains constant. This is because the difference in pressure, or differential pressure, between the pump and load pressures can be maintained by the stroking piston regardless of load. It is important to remember the pump is really responding to the pressure differential resulting from flow through the valve, not the actual load pressure level.

853sm22

853sm22

In the figure above the valve is closed blocking the pump from the load. With the load at zero the pump will maintain 500 p.s.i. of standby pressure and pump flow is zero.

853sm22

The following are key differences from open centre systems;

853sm22

When the control valve lever is moved to actuate a cylinder or motor, the control valve opens the pump to the load. In this case the load is zero and the pump output pressure falls as the oil escapes through the valve. The 250 p.s.i. that was holding the spring in the compressed state is reduced and the spring moves the pump to increase flow. Flow will increase to a level that requires 500 p.s.i. to force the oil through the valve opening. At this point the load pressure combined with the spring force will be high enough to oppose the pump output pressure, and the stroking piston will stop moving.

Changing the control valve lever changes the size of the opening in the valve and upsets the balance of the stroking piston. The stroking piston then adjusts the flow of the pump to find a new balance

1. The load sensing valve’s maximum flow is not equal to the pumps maximum flow as with the open centre system. The valves maximum flow is determined by the maximum size of opening or “orifice” it provides.

2. The speed of the load does not change as the load changes. If the load increases on a boom cylinder the pump pressure will increase automatically to maintain the load’s original speed. If the load stops, it is because the load is too heavy for the boom to lift.

Moving the lever further will not increase the lifting force.

3. A load sensing system provides the speed the operator selects with the lever, and automatically adjusts the pressure to match the load. The open centre system requires the operator to adjust the pressure to match the load and the speed is determined by the load.

4.10

Tigercat 870B Feller Buncher

Hydraulic system

OPERATING TIPS When using the controls on a load sensing system think of what the system is trying to do for you. If you move the lever 20% of its total angle, the system will provide whatever pressure it takes ( up to its maximum capacity if needed) to meet this speed requirement. If you move the lever past the point needed in an attempt to speed up the boom movement, you will only overshoot the speed you wanted. Relax and try to use the least amount of lever action you can.

Load sensing systems respond to rough operation by amplifying these movements. If you find the boom is jerky or always giving “feedback”, you’re probably too active on the controls. If slowing down doesn’t eliminate the roughness, the margin pressure setting may be too high and can be reduced to calm down the machine’s response.

Refer to SET MARGIN PRESSURE in this section.

Another feature of this system is that the maximum flow of each function, in each direction, can be tuned to your requirements. This is easily done by changing the flow adjusting screws on each control valve. Take the time to set up your machine, as this greatly reduces fatigue.

Refer to SET FLOW (FUNCTION SPEED) RATE in appropriate BOOM or SWING sections of THIS MANUAL.

4.11

Tigercat 870B Feller Buncher

870B-07

Hydraulic system

LOAD SENSING SYSTEM CIRCUIT DIAGRAM 4.12

Tigercat 870B Feller Buncher MAIN HYDRAULIC CIRCUIT CIRCUIT DESCRIPTION The main hydraulic circuit includes the components for boom, stick, tilt and swing operations.

An axial piston, swashplate controlled pump supplies oil for the main hydraulic system. A load sensing signal is sent back from the Linde control valve manifold (LS port) to the main pump regulator (LS port) to control the pump output pressure.

Oil flow for each function is supplied by its own control valve section on the manifold. When the control valves are in neutral, there is no flow through the valves, therefore the system is closed-centre. When all control valves are in neutral, the pump will only supply enough oil to make-up for leakage in the system and the pressure remains at a low level (approx. 500 psi).

The swing, boom, stick and tilt control valves trap oil in their circuits when the spools are in neutral.

Oil returning to the tank from the control valve sections must open back pressure check valves in the control valve manifold before flowing to the reservoir via the oil cooler. This creates a small positive pressure in the manifold to prevent cavitation in the cylinders. All oil returning to the reservoir is filtered.

Hydraulic system FLOW ON DEMAND AND LOAD COMPENSATION The combination of control valves and pump used in this system provides flow on demand and load compensation. Flow on demand means that only the required quantity of oil will be delivered to a function by the pump. This will save energy and reduce heat generation in the hydraulic system.

Load compensation means that all functions will continue to receive oil regardless of their pressure and without further movement of the control levers.

Without this system, an operator moving control levers halfway on the boom up and stick out controls would find that the lowest pressure function would move and the other would not move.

To make both functions move the operator would have to move the high load lever much more than the low load lever. In other words, the operator would have to restrict oil flow to one function while opening up the valve fully to the other. This is what the load compensation system does automatically as will be explained further below.

With the load compensation on this unit the operator does not need to continually adjust the control lever to move two or more functions because of pressure differences.

Valves inside of the main control valve spools will automatically adjust flow according to the pilot pressure applied to the spool to move functions independant of load pressure.

4.13

Tigercat 870B Feller Buncher SWING

Hydraulic system

MAIN BOOM STICK HIGH CYLINDERS CYLINDER PRESSURE LIMITING CONTROL

TILT CYLINDER CONTROL VALVE MANIFOLD

•

• •

870B-41

•

•

•

MAIN CONTROL VALVE

MAIN CONTROL VALVE DESCRIPTION

CONTROL VALVE SECTIONS

The main control valve consists of four individual valve sections, a high pressure limiting relief valve and a non adjustable safety relief. Each section, including the relief valve is fastened to the control valve manifold which contains five common passages for all valves.

The spools are pilot actuated and returned to neutral by centering springs. An air bleed plug is provided on the top pilot cap. If a hesitation is noticed when actuating a function, air should be bled from the pilot caps. Spool travel stop screws are fitted in the pilot end caps and are used to limit the spool travel so that maximum speed can be adjusted for each individual function. The screws can also be turned in to lower the boom or stick when the engine or pump will not operate.

The five passages are (refer to fig. 853sm24): 1. Centre passage for pump discharge.

2. Two return passages (connected internally).

3. Two for Load Sense (connected internally).

The swing spool has return pilot checks in the end caps which allow pilot oil to enter quickly, but restrict the flow out, thus dampening the movement of the control spool for smoother control of the function.

SWING DRIVE MOTOR SPOOL SECTIONS The swing valve section has make-up valves for anti-cavitation. See FIG. 90919.

BOOM FUNCTIONS SPOOL SECTIONS

2

The Boom, stick and tilt functions have relief and anti-cavitation valves. See FIG. 90744 with spool in NO-FLOW position and FIG. 90744-2 with spool in FLOW position.

3

1

853SM24

MANIFOLD/VALVE SECTION SCHEMATIC WITH RELIEF 4.14

Tigercat 870B Feller Buncher MAKE UP OR ANTICAVITATION VALVE

Hydraulic system MAKE UP OR ANTICAVITATION VALVE

WORK PORTS

•

•

PILOT CHECK

•

PILOT END CAP AIR BLEED PLUG

•

•

SPOOL TRAVEL STOP (ADJUSTABLE)

• •

•

•

•

BALL AND SPRING

LOAD SENSING 'LS'

•

COMPENSATOR VALVE PUMP 'P' RETURN 'T'

RETURN 'T'

LOAD SENSING 'LS'

CONTROL VALVE SECTION - TYPICAL FOR MOTOR OPERATED SWING FUNCTION

90919

WORK PORTS

ANTICAVITATION RELIEF VALVE MAX. FLOW ADJUSTING SCREW

•

ANTICAVITATION RELIEF VALVE

• •

•

• • • MAIN CONTROL SPOOL COMPENSATOR RETURN 'T'

PUMP 'P'

RETURN 'T'

90744

CONTROL VALVE SECTION - TYPICAL FOR CYLINDER OPERATED FUNCTIONS (SHOWN IN NO-FLOW POSITION)

90744-2

CONTROL VALVE SECTION - TYPICAL FOR CYLINDER OPERATED FUNCTIONS (SHOWN IN FLOW POSITION) 4.15

Tigercat 870B Feller Buncher PORT RELIEF AND ANTICAVITATION VALVE OPERATION

Hydraulic system MEDIUM SYSTEM PRESSURE

During normal operation, oil pressure in the work circuit is less than the circuit relief valve setting and the circuit relief valve remains closed.

During relief operation, the relief valve will open in three steps.

(Step 1) The pilot poppet 'D' is opened; Flow restriction through the hollow piston 'C' causes the pressure in the cavity behind the main poppet 'B' to decrease.

PILOT POPPET 'D'

• WORK PORT

• •

•

• RETURN

ORIFICE 'A'

NORMAL OPERATION

90744-4A

(Step 2) The piston seats against the poppet.

This further reduces oil flow into the cavity and greatly decreases the pressure against the back side of the main poppet.

MEDIUM SYSTEM PRESSURE

HIGHEST SYSTEM PRESSURE

•

(Step 3) The main poppet 'B' opens.

When the relief valve again closes, the piston and the pilot poppet move together until the pilot poppet is seated. Oil flows into the cavity through the clearance between the piston and the main poppet to move the piston away from the pilot poppet. This permits flow into the cavity through the piston to seat the main poppet.

RELIEF AND HOLLOW ANTICAVITATION PISTON 'C' POPPET 'B'

•

WORK PORT

• RETURN

RELIEF OPERATION

90744-6A

During anticavitation operation the main poppet 'B' will retract to allow oil to flow from the return passage into the work circuit.

LOW WORK PORT PRESSURE

ADJUSTING PROCEDURE 1. Loosen locknut.

•

WORK PORT

2. Turn the adjusting screw to obtain desired pressure reading on gauge.

• RETURN

3. Tighten locknut on adjusting screw making sure adjusting screw does not turn.

90744-5A

ANTICAVITATION OPERATION

4. Re-check pressure gauge reading.

Refer to SET MAIN BOOM, STICK AND PORT RELIEF VALVES in SECTION 12 of THIS MANUAL for more complete details.

PORT RELIEF VALVE

LOCKNUT • 17MM WRENCH

• • • • MAIN VALVE BODY

90744-4

4.16

ADJUSTING SCREW • 5MM ALLEN KEY

MAIN VALVE PORT RELIEF VALVE

Tigercat 870B Feller Buncher

Hydraulic system

CONTROL VALVE SPOOL OPERATION To achieve load sensing compensation, each control spool has two compensator valves and two L.S. check valves. These compensator valves can be either in the form of a shuttle valve or a ball, depending on the function being controlled.

PILOT END CAP

SHUTTLE COMPENSATOR CONTROL VALVE VALVE SPOOL

COMPENSATOR VALVE

SHUTTLE VALVE

PILOT END CAP

•

•

•

• CENTERING SPRING

•

•

• •

•

•

• •

• •

•

•

LOAD SENSING WORK WORK PASSAGE 'LS' PORT 'A' PORT 'B' SUPPLY RETURN RETURN PASSAGE 'P' PASSAGE 'T' PASSAGE 'T'

LOAD SENSING PASSAGE 'LS'

CENTERING SPRING

(A) CONTROL VALVE SECTION ~ IN NEUTRAL

853SM25

(A) Each work port (A & B) has a compensator valve and shuttle valve. Each valve section also has two return passages (T) and two load sensing passages (LS). Each valve section has only one supply passage (P).

With the control valve spool held in neutral by the centering springs in both pilot caps, the pump discharge is blocked. Therefore, the control valves are closed centre. Pump discharge, work port, return, and load sensing passages are all blocked by the spool. Oil in the work ports is trapped.

With all control valve spools in neutral, pump discharge or "standby" oil pressure is approximately 400-600 psi.

PILOT OIL

LS PORT JUST OPENED

SHUTTLE VALVE

CONTROL SPOOL

• •

(B) CONTROL VALVE SECTION ~ • CONTROL SPOOL STARTING TO MOVE TO RIGHT • LS PORT JUST OPENED • ONLY SPOOL ACTUATED 853SM26

(B) Whenever a single function is operated, pilot oil flows to a control valve end cap. Pilot oil will start to move the spool against the centering spring on the opposite end of the spool. The load sensing port (LS) is the first port to open. When the LS port is opened, the shuttle cavity is at LS pressure. Since this is the first function being operated, there is no LS pressure in the manifold and the shuttle does not move.

4.17

Tigercat 870B Feller Buncher PILOT OIL

Hydraulic system SHUTTLE VALVE

•

BALANCE VALVE

•

CONTROL SPOOL

•

WORK PORT 'A' JUST OPENED

(C) CONTROL VALVE SECTION ~ • CONTROL SPOOL CONTINUES TO MOVE TO RIGHT • WORK PORT 'A' JUST OPENED • HIGHEST WORKING PRESSURE

853SM27

(C) The second port to open is work port ‘A’ (port ‘B’ if the control spool moves to the left). The left compensator valve stays to the right as in the neutral condition and the shuttle valve moves to the left directing work port pressure to the area behind the compensator valve to hold it shut until it can be opened by pressure in the ‘P’ port. In this mode, the compensator valve is functioning as a load check valve would in a conventional valve.

PILOT OIL

(5) SHUTTLE (6) COMPENSATOR VALVE VALVE MOVES LEFT

CONTROL SPOOL

TANK PORT 'T' (RETURN)

(1) ANGLED VENT PORT OPENS

• •

•

•

• •

(4) OIL FLOWS TO 'LS' PASSAGE

(3) PRESSURE PORT OPENED SLIGHTLY

(2) WORK PORT 'B' OPENS

(D) CONTROL VALVE SECTION ~ • CONTROL SPOOL CONTINUES TO MOVE TO RIGHT 853SM28

• PRESSURE PORT OPENED SLIGHTLY • HIGHEST WORKING PRESSURE

(D) The next port to open is the angled vent port (1) on the right side of the control spool which connects to the tank port, ‘T’. This connects all passages in the compensator spool to return pressure. There is no movement at this time but as soon as the work port ‘B’ opens (2) and oil flows, the returning oil will push the compensator valve to the right and connect ‘B’ to ‘T’.

The pressure port in the control spool is the last port to open (3). When it opens, pump discharge pressure flows through the passage in the compensator spool and through the shuttle cavity to the load sense passage (4).

The load sensing pressure increases causing the pump to increase its displacement and further increase the pressure. The compensator valve keeps the work port passage closed until the pump discharge pressure is higher than the work port pressure (load check feature).

Once the pump discharge pressure is higher, the shuttle valve moves to the right (5) and connects load sensing pressure to the cavity behind the compensator valve. The compensator valve moves to the left (6) allowing oil to flow to the work port. With the compensator valve open, the cavity to the right of the compensator valve assumes approximate work port pressure and this pressure flows through the passage to the shuttle cavity allowing work port pressure to control load sensing pressure. As the control spool moves further, in response to pilot pressure, the compensator valve and shuttle valve positions remain the same.

4.18

Tigercat 870B Feller Buncher PILOT OIL

(1) COMPENSATOR VALVE

Hydraulic system CONTROL SPOOL FULLY SHIFTED TO RIGHT

SHUTTLE VALVE

•

•• •

•

•

•

•

•

•

LOAD SENSING WORK WORK LOAD SENSING PASSAGE 'LS' PORT 'A' PORT 'B' PASSAGE 'LS' SUPPLY PASSAGE 'P' RETURN RETURN (PUMP DISCHARGE) PASSAGE 'T' PASSAGE 'T'

(E) CONTROL VALVE SECTION ~ • CONTROL SPOOL FULLY SHIFTED TO RIGHT • HIGHEST WORKING PRESSURE

853SM29

(E) In this figure, pump discharge pressure is slightly higher than work port pressure because the compensator valve (1) is open. When using just one function both the compensator valve and the shuttle valve are moved to the end of their bores.

The load sensing pressure is always the same as the highest work port pressure and as a result is always lower than pump discharge pressure. There are two factors that establish this pressure difference between pump discharge and work port pressure, the load sensing valve and the orifice effect of the passages in the control valve between the pump discharge port and the work port. There are three openings the pump discharge oil must flow through to get to the work port. Each time the oil flows through a passage there is a pressure drop, that is, there is an orifice at each passage. The smaller the opening the smaller the oil flow due to the constant load sensing pressure. There is a passage from the work port to the load sensing passage and this is the pressure sensed at the pump regulator; since the flow is very small there is virtually no pressure drop from the work port to the LS port on the pump.

Load sensing pressure is the same at both ends of all the control spools because the two passages in the control valve manifold are joined together in the manifold.

LOAD SENSING ~ TWO OR MORE FUNCTIONS IN USE Load compensation comes into effect whenever two or more functions are actuated at the same time.

The following is an explanation of the function of the valve components whenever a spool with a lower working pressure is activated when a higher working pressure spool is fully shifted.

PILOT OIL

LS PORT JUST OPENED

COMPENSATOR (2) SHUTTLE VALVE MOVES TO RIGHT VALVE

(1) CONTROL SPOOL STARTS TO MOVE

CENTERING SPRING

• ••

•

(F) CONTROL VALVE SECTION ~ • CONTROL SPOOL STARTING TO MOVE TO RIGHT 853SM30

• LS PORT JUST OPENED • LOWER WORKING PRESSURE

(F) Pilot oil will start to move the control spool against the centering spring on the opposite end of the spool. The LS port is the first to open and load sensing pressure is applied to the shuttle valve. The shuttle valve moves to the right to the end of its bore and then LS pressure flows into the cavity at the left end of the compensator valve.

4.19

Tigercat 870B Feller Buncher

Hydraulic system

SHUTTLE VALVE

PILOT OIL

CONTROL SPOOL

COMPENSATOR VALVE

•

•

•

WORK PORT 'A' JUST OPENED

(G) CONTROL VALVE SECTION ~• CONTROL SPOOL CONTINUES TO MOVE TO RIGHT • WORK PORT 'A' JUST OPENED • LOWER WORK PORT PRESSURE

853SM31

(G) As the control spool continues to move, the work port is the next to open. The work port oil pressure passes through compensator valve port and is applied to the end of the shuttle valve but since this work port pressure is lower than LS, the shuttle does not move.

PILOT OIL

SHUTTLE VALVE

(4) COMPENSATOR VALVE MOVES LEFT THEN RIGHT (5)

•

CONTROL SPOOL

•

TANK PORT 'T' (RETURN)

(1) ANGLED VENT PORT OPENS

• •

• •

OIL FLOWS TO 'LS' PASSAGE

(3) PRESSURE PORT OPENED SLIGHTLY

(2) WORK PORT 'B' OPENS

(H) CONTROL VALVE SECTION ~ • CONTROL SPOOL CONTINUES TO MOVE TO RIGHT 853SM32

• PRESSURE PORT OPENED SLIGHTLY • LOWER WORKING PRESSURE

(H) As the control spool continues to move, the angled vent port opens (1), then work port ‘B' opens (2) allowing oil to flow and shift the right side compensator valve connecting port 'B' to 'T'. The pressure port ‘P’ is next to open (3) and supply pressure passes into the cavity to the right of the compensator valve causing it to shift to the left (4) since the supply pressure is somewhat greater than LS pressure. As it shifts to the left (4) oil can travel into work port ‘A’ and in doing so it causes pressure in the cavity to drop which results in LS pressure pushing the compensator valve back to the right (5). The compensator finds a position where the pressures are balanced and some oil flows into work port ‘A’.

4.20

Tigercat 870B Feller Buncher PILOT OIL

Hydraulic system (1) CONTROL SPOOL FULLY SHIFTED TO RIGHT

(2) COMPENSATOR VALVE SETTLES IN A BALANCE POSITION

•

• •

•

•

•

•

•

•

WORK LOAD SENSING WORK LOAD SENSING PORT 'A' PASSAGE 'LS' PORT 'B' PASSAGE 'LS' RETURN RETURN SUPPLY PASSAGE 'P' PASSAGE 'T' PASSAGE 'T' (PUMP DISCHARGE)

(I) CONTROL VALVE SECTION ~ • CONTROL SPOOL FULLY SHIFTED TO RIGHT 853SM33

• LOWER WORKING PRESSURE

(I) As the control spool continues to move (1), the compensator spool continues to move in response to the pressure variations and it settles in a position of balance (2) as shown in the figure with the spool fully shifted. As the loads vary in the work ports, the valve components continue to modulate and compensate for the load variations and maintain movement of the selected functions.

This valve system performs the functions automatically that are performed by an operator using a conventional system as explained in the third paragraph above.

If the second valve being operated had a higher work port pressure than the one already selected, the operation would be the same up to the point where the work port was opened. At this point the LS would change to the new higher work port pressure and the new valve would act in the same way as the first valve selected and described above. The first valve selected would then have the internal spool components take the same positions as the lower work port pressure valve described above.

4.21

Tigercat 870B Feller Buncher HIGH PRESSURE LIMITING CONTROL VALVE The main pump is protected by a High Pressure Limiting control which consists of three relief valve cartridges. The H.P.L. control is attached to the main control valve manifold and contains three relief valves: The first relief valve (P2) limits L.S. pressure to approx. 4000 psi. (Gauge at 'L.S.' test port) which in turn limits the pump output pressure to 4300 psi. (Gauge at 'P' test port) The 300 psi. differential is known as margin pressure. See SET MARGIN PRESSURE in THIS SECTION.

Hydraulic system P2 L.S. PRESSURE LIMIT, SET AT 4300 PSI. WITH GAUGE ON 'P' TEST PORT • 4MM ALLEN KEY • 13MM WRENCH MAIN CONTROL VALVE MANIFOLD

The third relief valve (P1) is screwed fully in and is not used.

•

SYSTEM RELIEF VALVE NON-ADJUSTABLE

• HIGH PRESSURE LIMITING CONTROL

845B-D20

HIGH PRESSURE LIMITING CONTROL VALVE

1. CENTRE PASSAGE FOR PUMP DISCHARGE. 2. TWO RETURN PASSAGES (CONNECTED INTERNALLY).

3. TWO PASSAGES FOR LOAD SENSE (CONNECTED INTERNALLY).

853SM24

• •

•

Margin pressure is the differance between 'P' port pressure and L.S. port pressure, observed while a function is operating.

The second relief is a system relief valve which limits the pump output pressure to 870 psi above L.S. pressure, this relief is non-adjustable.

P1. SCREWED FULLY IN NOT USED

H.P.L. CONTROL, MANIFOLD/ VALVE SECTION SCHEMATIC WITH PORT RELIEFS 4.22

Tigercat 870B Feller Buncher

Hydraulic system •

PORT 'A'.

SIGNAL PRESSURE FROM ANTI-STALL VALVE NO FUNCTION DO NOT ADJUST

•

• •

• MAIN PUMP CONTROLLER

870B-42.AI

SET MARGIN PRESSURE

The margin pressure adjustment is made at the main pump controller attached to the main pump. The pressure gauge connections are the 'L.S.' and 'P' gauge test ports on the Linde main valve manifold.

MARGIN PRESSURE is the difference between the LOAD SENSE pressure and the PUMP OUTPUT pressure while a function (boom, swing or travel) is being operated. For the load sensing system to operate correctly the differential pressure between L.S. and 'P' should be 300 psi. 'P' being higher than L.S. **NOTE: If the margin pressure is not set correctly, the machine controls may not respond as they should, i.e. boom is jerky or sluggish.

•• •

NO FUNCTION DO NOT ADJUST

••

The margin pressure is set at the factory to 300 psi. The margin pressure can be adjusted from 250 - 300 psi., however the flow stops on the valves must be reset in order to maintain the same speed of the functions.

1. Use a differential pressure gauge* (preferably a differential gauge with ten psi increments).

* MAIN PUMP

MARGIN PRESSURE ADJUSTING SCREW

• •••

•• GAUGE TEST PORT 'A' ANTI-STALL SIGNAL PRESSURE PORT 'A' CONNECTION FROM ANTI-STALL VALVE 'LS' CONNECTION FROM MAIN VALVE 870B-D02

LOAD SENSE PRESSURE

MARGIN PRESSURE ADJUSTING SCREW • 8mm WRENCH • 19mm WRENCH (Turn OUT to decrease Margin pressure)

MAIN PUMP CONTROLLER (LS CONTROL)

If a differential pressure gauge is not available, one single 0-5000 psi gauge may be used; First placing it on the L.S. test port and noting the reading, Then on 'P' test port and noting the reading. 'P' should be 300 psi. greater than 'L.S.'.

2. With hydraulic oil at operating temperature, Connect one side of the differential pressure gauge to the L.S. gauge port located on the back of the main control valve manifold and the other side of the gauge to the pressure 'P' gauge test port.

3. Start the engine and place throttle control in FULL position.

4. Press PILOT RESET button to activate pilot system and turn anti-stall switch OFF. 4.23

Tigercat 870B Feller Buncher 5. Turn swing brake ON and place SWING joystick lever in FULL position (left or right).

Hydraulic system SET LOAD SENSE RELIEF VALVE NOTE: Constant loosening and tightening of the locknut (sealnut) on the adjusting screws of these relief valves will eventually cause the seal in the nut to break down and leak.

Because of this it is best to keep the adjusting procedure brief.

6. Loosen locknut on margin pressure adjusting screw on main pump controller and turn adjusting screw until the differential reading on gauge is 300 psi**. (Turn OUT to decrease Margin pressure).

If only one 0-5000 psi gauge is being used; It should first be connected to the L.S. test port and the reading noted, it should then be connected to the 'P' test port and the margin pressure adjusting screw adjusted until reading on gauge is 300 psi** greater than the 'L.S.' previously noted reading.

1. With hydraulic oil at operating temperature, Connect a 0 - 5000 psi gauge to 'P' gauge test port on back of main control valve manifold.

HIGH PRESSURE LIMITING CONTROL

NOTE: This is a sensitive adjustment, significant changes in pressure will be noticed with only a small movement of the adjusting screw.

MAIN VALVE MANIFOLD

• •

'P' GAUGE TEST CONN.

7. Allow a short time for pressure reading to stabilize then tighten locknut on adjusting screw. Repeat above procedure to verify the differential pressure setting is still correct.

• •• L.S. GAUGE TEST CONN. 103-17A

GAUGE TEST PORTS

2. Start engine and set throttle control to FULL position.

3. Press PILOT RESET button to activate pilot system and turn anti-stall switch OFF. 4. While holding L.H. joystick in the STICK OUT position (fully extended), loosen locknut on P2 relief valve cartridge and turn adjusting screw until pressure gauge reads 4300 psi. Tighten locknut on adjusting screw and re-check pressure reading on gauge.

5. Stop engine and remove pressure gauge.

4.24

Tigercat 870B Feller Buncher PRESSURE SETTINGS

Hydraulic system

WITH Tigercat ST 5700 SAW FELLING HEAD ENGINE RPM (With Cummins 6CTA8.3 Elite (260 HP)) FULL THROTTLE, NO LOAD, MAX. ........................... 2250 - 2300 RPM IDLE, NO LOAD ..................................................... 800-1000 RPM RATED WORKING ..................................................... 2100 RPM L.H. & R.H. FINAL DRIVE CROSSLINE RELIEFS ................................................ 4750 - 4950 PSI BEGIN OF STROKE (MOTOR POR) ........................... 3600 PSI ('B' TEST PORT) WITH 120 PSI AT 'DC2' TEST PORT. BRAKE RELEASE ..................................................... 400 PSI OR HIGHER (PILOT PRESSURE) SPEED (TRACK SPROCKET RPM): LOW ......................................................................... 16 RPM MAX. DRIVE ...................................................................... 30 RPM MAX. MAIN PUMP ANTI-STALL SET POINT (GLR SPEED) ..................... 2100 RPM (ECONOMY MODE SETTING) 1850 RPM (POWER MODE SETTING) HIGH PRESSURE LIMITING CONTROL on main Linde valve MAIN RELIEF ................................................... NON-ADJUSTABLE LOAD SENSE RELIEF P1 ........................................... SCREW IN FULLY (LOCKED OUT) LOAD SENSE RELIEF P2 ........................................... 4300 PSI AT 'P' (4000 PSI AT 'LS') BOOM PORT RELIEFS ............................................... 4700 PSI AT 'P' STICK PORT RELIEFS ............................................... 4700 PSI AT 'P' TILT PORT RELIEFS .................................................. 4700 PSI AT 'P' MARGIN PRESSURE .................................................. 300 PSI PILOT SUPPLY MAIN RELIEF .............................................................. 450 PSI SWING CROSSLINE RELIEFS, LEFT MOTOR ....................... 3600 PSI AT 'P' CROSSLINE RELIEFS, RIGHT MOTOR ..................... SCREW IN FULLY (LOCKED OUT) SPEED ........................................................................ 7 RPM SAW PUMP PRESSURE OVERRIDE ............................................. 3600 PSI STAND-BY ................................................................... SCREW IN FULLY (LOCKED OUT) SAW CONTROL VALVE MAIN RELIEF .............................................................. 4000 PSI SAW MOTOR BEGIN OF STROKE .................................................... 3200 PSI SPEED ........................................................................ 1125 - 1175 RPM MOTOR 'X' DIMENSION ............................................. 16MM (0.63") OF 90MM (3.56") WRIST / CLAMPS VALVE MAIN RELIEF .................................................................. 2700 PSI (FULL THROTTLE) WRIST PORT RELIEFS .................................................. 3200 PSI (IDLE) CLAMP ARMS PORT RELIEFS ..................................... 3200 PSI (IDLE) ACCUMULATOR ARMS PORT RELIEFS ...................... 3200 PSI (IDLE) DOOR / ROOF PUMP MAIN RELIEF .................................................................. 2000 PSI ALL PRESSURES MUST BE SET WITH HYDRAULIC OIL AT OPERATING TEMPERATURE. SEE APPROPRIATE SECTIONS IN THE SERVICE MANUAL FOR SETUP PROCEDURES. NOTE: THIS CHART IS FOR REFERENCE PURPOSES ONLY.

ISSUE 2 0603

4.25

Tigercat 870B Feller Buncher

Hydraulic system

4.26

Tigercat 870B Feller Buncher

SECTION 5 - PILOT/CHARGE SYSTEM MARCH 2003

CONTENTS - SECTION 5 ACCUMULATOR CHARGING ................................................................................................ 5.8 CHECK PRE-CHARGE PRESSURE .......................................................... 5.8 DESCRIPTION ........................................................................................... 5.5 TESTING DEVICE ...................................................................................... 5.8 CHARGE/PILOT/FILTER MANIFOLD ............................................................ 5.2 CIRCUIT DIAGRAM, PILOT SYSTEM ........................................................... 5.7 ELECTRICAL CIRCUIT ................................................................................. 5.6 MANIFOLD, CHARGE/PILOT/FILTER........................................................... 5.2 MANIFOLD, PILOT ........................................................................................ 5.4 PILOT SYSTEM COMPONENTS .................................................................. 5.2 ACCUMULATOR ........................................................................................ 5.5 CHARGE/PILOT/FILTER MANIFOLD ........................................................ 5.2 JOYSTICKS AND FOOT PEDALS ............................................................. 5.4 PILOT MANIFOLD ...................................................................................... 5.4 PILOT SYSTEM DESCRIPTION.................................................................... 5.2 PRESSURE SETTINGS ................................................................................ 5.6 SCHEMATIC DIAGRAMS CHARGE/PILOT/FILTER MANIFOLD ........................................................ 5.6 CIRCUIT DIAGRAM .................................................................................... 5.7

Tigercat 870B Feller Buncher PILOT SYSTEM COMPONENTS AND DESCRIPTION

Pilot/Charge system be caused by cold weather starting or a clogged filter element. A "Clogged" condition will result in low pilot pressure. If a loss of controls or slow response occurs, filter element may need to be changed.

The closed centre pilot circuit receives oil from one of two cartridges in a double gear pump driven off the PTO of the main pump. A charge/pilot/filter manifold with an attached filter, divides the oil to serve the pilot system and also to supply charge pressure oil to both track drive closed loop circuits and pilot oil to the drive motor brakes and the engine anti-stall valve.

The pressure of the filtered oil is then controlled by a spring biased logic valve cartridge (70 psi) combined with a relief valve cartridge (380 psi) to provide a total pilot pressure of 450 psi.

PILOT SHUT-OFF SOLENOID

CHARGE/PILOT/FILTER MANIFOLD

FILTER CLOG INDICATOR

Oil entering the charge/pilot/filter manifold is first filtered by the inline filter. A 40 psi built in bypass valve will return oil to the tank should any restriction be encountered by the filter element, which could

••

•

IMPORTANT Contaminated hydraulic fluid can lead to premature failure of hydraulic components and costly repairs. Filters must be replaced at the recommended time intervals, See SECTION 3 in THIS MANUAL.

PILOT DUMP SOLENOID PILOT RELIEF VALVE (380 PSI)

••

LOGIC VALVE (70 PSI)

Use of hydraulic filters other than the Tigercat brand could lead to severe wear and rapid failure of hydraulic system components.

830-D16

•• •

CHARGE/PILOT/FILTER MANIFOLD

ENGINE ANTISTALL VALVE GAUGE TEST PORT

•

••

PILOT SHUT-OFF SOLENOID

•• PILOT RELIEF VALVE ACCUMULATOR

•

PILOT DUMP SOLENOID

•• ••

•• 870B-D01

CHARGE/PILOT/FILTER MANIFOLD 5.2

INLINE FILTER

Tigercat 870B Feller Buncher

Pilot/Charge system

Charge oil (450 psi) is supplied to the two track drive pumps via ports 'P1 and 'P2' on the manifold to charge the left and right closed loop hydrostatic drive systems, this is known as charge pressure.

BRAKE RELEASE VALVE

HYDRAULIC TANK

An accumulator is plumbed into the 'P2' line to ensure that the pressure in the pilot system is always maintained and never falls off during high demands.

The engine anti stall system is also supplied with pilot oil via port 'G' on the manifold to port 'P' on the engine anti stall valve.

A pilot dump solenoid valve cartridge on the manifold is activated when the key switch is turned to the START position to crank the engine, during this procedure the pilot dump valve will open and drain the pilot system to tank, this will remove any unnecessary load placed on the engine by the charge/pilot pump during starting.

870B-D03

valve cartridge spool and allow pilot oil to flow. See PILOT RESET in SECTION 2 of the OPERATOR'S MANUAL. With this pilot-shut off valve energized pilot oil (450 psi) via the 'PS' port then enters the pilot manifold where it is distributed to the various pilot actuated functions of the machine. Solenoid operated pilot valves within the pilot manifold, control the flow of pilot oil to various functions.

A remote mounted saw pilot valve, the two joysticks and the two foot control pedals receive pilot oil via the 'P2' port on the pilot manifold.

In an emergency, pressing the pilot shut-off switch (Red button) located in the cab will de-energize the pilot shut-off valve cartridge, drain all pilot oil to tank including the brake release valve and render all pilot functions discussed above inoperative.

SAW PILOT VALVE

•• ••

•

••

870B-D04

The pilot shut off solenoid valve cartridge on the manifold controls the supply of pilot oil (450 psi) to the pilot manifold, the saw pilot valve and the drive motor brake release valve. Pilot oil cannot be supplied to these functions until the pilot system has been activated by first lowering the left armrest of the seat (from the seated position) and then pressing the pilot reset switch on the control panel, this will energize the pilot shut-off solenoid, shift the

MAIN "LINDE" VALVE

••

TRACK MOTOR POR VALVE/MANIFOLD

DRIVE MOTOR BRAKE RELEASE VALVE

A return port 'RTN' on the charge/pilot/filter manifold, allows oil to flow at 70 psi from the manifold occasionally vented by the spring biased logic valve cartridge (70 psi) to the 'T3' port on the main Linde valve via a check valve, this provides a back pressure in the tank line passages of the main Linde valve and reduces the possibility of cavitation in the components of the load sensing system.

ATTACHMENT CONTROL VALVE

••

PILOT MANIFOLD

••

PILOT MANIFOLD 5.3

Tigercat 870B Feller Buncher TRACK LOW/DRIVE

••

SWING BRAKE

••

•

Pilot/Charge system

WRIST RIGHT

••

CLAMP OPEN

ACCUM. CLOSED WRIST LEFT CLAMP CLOSE ACCUM. OPEN

••

••

••

•

'IN' INLET PORT, PLUGGED 'T' TANK PORT

••

•• 'P2' PRESSURE PORT (FROM 'PS' PORT ON CHARGE/PILOT/ FILTER MANIFOLD

'P2' OUTLET PORT

•• •

'T' TANK PORT

PILOT MANIFOLD There are two tank ports ('T') located on each end of the manifold which are inter-connected The pilot manifold is located above the main with each other. One of them is connected to the Linde valve. Pilot oil enters the manifold at the tank return lines ('T') from the joysticks and foot 'P2' port and is then distributed to the various pilot pedals and the other one is connected to and functions of the machine. returns oil to the hydraulic tank.

The manifold distributes oil to the following circuits through the ports listed below: JOYSTICKS AND FOOT PEDALS 870B-D05

PILOT MANIFOLD

• • • • • • • • • • • •

Pilot oil enters Joysticks (both) ) Drive pedals (both) ) Saw pilot valve ) LOW/DRIVE range Swing brake Wrist right Clamp arm open Accumulating arm close Wrist left Clamp arm close Accumulating arm open

(P2) pressure port (P2) outlet port (1) solenoid valve (2) solenoid valve (3) solenoid valve (4) solenoid valve (5) solenoid valve (6) solenoid valve (7) solenoid valve (8) solenoid valve

These pilot valves are manually operated, directional control valves and operate on the same principle as a direct operating pressure reducing valve. Both the joystick and foot control valves (pedals) use similar spool arrangements.

Operated by hand or foot these valves direct pilot

There are three 'P2' port in the manifold and they are all inter-connected.

Pilot oil enters the pilot manifold through the pressure port ('P2') on the end of the manifold.

One outlet pressure port ('P2') on the opposite end of the manifold, feeds the saw pilot valve, both joysticks and both drive foot pedals. The front facing 'P2' port is plugged and not used for this application.

Eight solenoid operated pilot valves on the manifold, when energized, supply "on demand" pilot oil to the corresponding functions. These valves are activated by controls in the cab.

RR-12

5.4

JOYSTICK PILOT VALVE

Tigercat 870B Feller Buncher

Pilot/Charge system ACCUMULATOR

'P' PORT AU013-2

•

•

5

• •

4 3

• •

•

2

•

1

The accumulator is installed to ensure controls remain responsive by maintaining optimum pilot pressure. This prevents the pilot pressure from dropping when several functions are activated at the same time.

•

WORK PORTS 1, 2, 3 OR 4

SPOOL ARRANGEMENT

oil to the main control valve pilot end caps. The corresponding spool valve then shifts from its centre position and directs pump flow to operate a function.

OPERATING DESCRIPTION In the neutral position the joystick lever is held centered by return springs (4). When the lever (1) is operated, the plunger (5) is pushed against its 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 ports 1, 2, 3 or 4 in the base of the valve, to the boom valve pilot end caps.

ACCUMULATOR

221-18A

The accumulator is a bladder type and is installed with a nitrogen pre-charge pressure. The gas pressures should be checked if the pilot system VALVE GUARD

Pilot pressure is directly proportional to the operator position of the joystick or foot pedal and the regulating spring characteristics.

VALVE CAP GAS VALVE

BODY

BLADDER

HYDRAULIC CONNECTION ACCU-

POPPET (Seats against oil port after oil evacuation)

ACCUMULATOR (BLADDER TYPE)

exhibits repeated and frequent charging cycles.

Refer to CHECKING PRE-CHARGE PRESSURE in THIS SECTION.

5.5

Tigercat 870B Feller Buncher

Pilot/Charge system

PILOT SYSTEM ELECTRICAL CIRCUIT

SET PILOT PRESSURE

Refer to circuit diagram;

1. With hydraulic oil at operating temperature, connect a 0-1000 psi. gauge to the gauge test fitting tee'd onto the charge/pilot/filter manifold.

When the key switch is turned to the START position to crank the engine, current flows through wire 23 to energize the start relay coil and close the contacts. Current then flows from the 'IGN' terminal on the key switch through wire 6, across the function lockout relay contacts, through wire 09, across the start relay contacts, through wire 16/16B to energize the coil on the pilot dump solenoid. With the pilot dump valve energized, any residual pilot pressure in the system is drained to tank via the 'DR' port on the charge/ pilot/filter manifold. Releasing the key switch from the START position de-energizes the pilot dump valve and blocks the pilot system connection to the 'DR' port.

With the engine running, the pilot shut off solenoid is not energized until the armrest is down and the pilot reset switch is momentarily pressed. When this switch is pressed, the coil on the function lockout relay is energized closing the circuit between wires 6 and 33. Wire 33 connects to the armrest switch. When this switch is closed (armrest down) current flows through wire 11 to energize the coil on the pilot shut off valve to shift the valve spool and supply oil to the pilot manifold and the drive motor brake release valve. At the same time the wire from the armrest switch is connected back to the function lockout relay coil through a diode and thus latches the function lockout relay in the energized position after the pilot reset switch has been released.

The diode in the circuit prevents the flow of current to the pilot shut off solenoid when the armrest switch is open (armrest up). Even if the pilot reset switch is held down, it will not operate.

Whenever the arm is raised and the switch opens, the voltage is interrupted to the function lockout relay coil and the relay contacts open resulting in the pilot shut off valve returning to the normally closed position. This prevents pilot oil from reaching the controls.

2. Turn anti-stall switch OFF. 3. Loosen locknut and turn adjusting screw all the way OUT on pilot relief valve, tighten locknut on adjusting screw.

RELIEF VALVE

••

LOCKNUT

ADJUSTING SCREW

••

•

•

CHARGE/PILOT/FILTER MANIFOLD 830-D17

PILOT RELIEF VALVE

4. Start engine and set throttle in IDLE position.

5. Have an assistant in the cab lower the armrest and press the pilot reset switch.

6. Loosen locknut on pilot relief valve and turn adjusting screw IN until pressure gauge reads 450 psi.

7. Tighten lock nut on pilot relief valve adjusting screw taking care not to turn the adjusting screw at the same time.

8. Verify pilot pressure is set at 450 psi.

8. Stop engine, remove pressure gauge and wipe away any spills.

A second pilot shut off switch is in the same circuit as the armrest switch. If an emergency situation should arise, pressing the pilot shut-off switch (Red button) located in the cab will remove current from wire 11 and de-energize the pilot shut-off solenoid valve cartridge and render all pilot functions discussed above inoperative.

870B-09

SCHEMATIC, CHARGE/PILOT/FILTER MANIFOLD

5.6

Tigercat 870B Feller Buncher

870B-08

Pilot/Charge system

PILOT/CHARGE SYSTEM CIRCUIT DIAGRAM 5.7

Tigercat 870B Feller Buncher CHARGING THE ACCUMULATOR NOTE: A detailed instruction sheet is provided with the charging and testing device. The following is only a suggested guide.

•

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

•

Remove the valve guard and cap.

•

Screw the charging and testing device onto the gas valve.

HOSE*

PRESSURE GAUGE*

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

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 ACCUMULATOR in THIS section for correct pressure.

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.

ADAPTER* ADAPTER* NITROGEN BOTTLE

ACCUMULATOR

ASSEMBLY PART NO. 90254 INCLUDES PARTS SHOWN * ACCU-

CHARGING AND TESTING DEVICE

•

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

•

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

•

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

Accumulator pre-charge - 325 psi NOTE: The pre-charge pressure will vary depending on the temperature. Once the desired pre-charge is reached, wait two minutes for the gas temperature to equalize.

Re-check pre-charge and adjust if necessary.

•

Disconnect hose from nitrogen bottle.

•

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

•

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

NEVER USE AN AUTOMOTIVE TYPE VALVE.

5.8

Tigercat 870B Feller Buncher

SECTION 6 - ELECTRICAL, GAUGES AND ALARMS MARCH 2003

CONTENTS - SECTION 6 ELECTRICAL SCHEMATIC DIAGRAM ........................................... 6.2, 6.3, 6.4 GAUGES AND ALARMS ................................................................................ 6.6 CHART ........................................................................................................ 6.6 SWITCH AND SENSOR LOCATIONS ............................................................ 6.7 WIRE COLOUR CODE CHART ....................................................................... 6.4

Tigercat 870B Feller Buncher

870B-10 (17445B R0)

Electrical, gauges and alarms

MACHINE ELECTRICAL SCHEMATIC DIAGRAM PAGE 1 OF 3 6.2

Tigercat 870B Feller Buncher

870B-11 (17445B R0)

Electrical, gauges and alarms

MACHINE ELECTRICAL SCHEMATIC DIAGRAM PAGE 2 OF 3 6.3

Tigercat 870B Feller Buncher

870B-12 (17445B R0)

Electrical, gauges and alarms

MACHINE ELECTRICAL SCHEMATIC DIAGRAM PAGE 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 ........................................ (protected and unprotected) 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 870B Feller Buncher

Electrical, gauges and alarms

6.5

Tigercat 870B Feller Buncher GAUGES AND ALARMS

Electrical, gauges and alarms

The 870B is monitored for proper operation by sensors (senders or switches) located in the hydraulic system and on the engine. These sensors are connected to either gauges, warning lights and alarms. A horn will also sound when the machine is travelling in reverse or when the engine enclosure power operated side door and roof are being operated.

A safety alert horn located in the engine compartment is activated by a switch on the control panel in the cab. Use this any time it becomes necessary to warn personnel in the area of your presence or when the engine is about to be started.

For a more complete description of the gauges and warning lights listed below, refer to SECTION 2 in the OPERATOR'S MANUAL. SENSOR FUNCTION

GAUGE RANGE

LIGHT

HORN

TRIGGER OR RANGE INFO

Engine coolant level ..................... None ............ ON ....... SOUNDS ............Low coolant level, STOP ENGINE. Engine coolant temp. ............. 100°F - 280°F .... None ...... SOUNDS .... Operating range 190°F-215°F (88°C-102°C) (38°C) - (138°C) ...................... @ 215°F (102°C)

Engine oil pressure .................. 0 - 100 psi ....... None ...... SOUNDS ................... Stop engine below 15 psi * @ 5 psi or lower*

Engine hours .............................. 0-9999 ......... None .......... None ............................. Engine running Pump drive gearbox oil temp. . 100°F - 240°F .... None .......... None ............... Stop engine above 240°F (116°C) (38°C) - (116°C)

Hydraulic oil temp. .................. 100°F - 240°F .... None ...... SOUNDS ............ Stop machine above 185°F (85°C) (38°C) - (116°C) ....................... @ 205°F (96°C)

Volts .......................................... 8v - 18v ......... None .......... None ............. Normal operating range 12-13.5 volts Fuel level .................................... 'E' - 'F' .......... None .......... None ................... Capacity (US gal/L): 210/795 Hydraulic oil - low ......................... None ............ ON ........... None ........................ 6 Gal. (27L) below Full Hydraulic oil -Very low .................. None ............ ON ....... SOUNDS .................... 12 Gal. (64L) below Full Hydraulic oil filter bypass .............. None ............ ON ........... None ........... Return filter restriction, 15 psi or greater Pump inlet ................................... None ............ ON ........... None .......... Pump inlet pressure drops below 1-2 psi Hydraulic oil tank pressure** ........ 0 - 30 psi ........ None .......... None .............. Increase tank pressure below 3 psi Back-up alarm ...............................N/A ............. N/A ....... SOUNDS ........... One or both drive pedals in reverse Horn, safety alert ............................ N/A ............. N/A ....... SOUNDS ..... Push button on L.H. joystick or control panel *NOTE: Horn will sound when key is in "RUN" position with engine "OFF" due too low oil pressure. **NOTE: Hydraulic oil tank pressurization only applicable to later machines

6.6

Tigercat 870B Feller Buncher

DOOR PUMP RELAY

ENGINE START SOLENOID RELAY

Electrical, gauges and alarms

FUEL BATTERY SOLENOID DISCONNECT SWITCH

ENGINE SPEED SENSOR

• •

•

• • •

VIEW 'A'

VIEW 'B'

•

HYDRAULIC OIL LEVEL SIGHT GAUGE AND TEMP. GAUGE LEVEL SWITCH ( LOW ALARM)

ENGINE OIL PRESSURE SENDER (GAUGE)

POWER ROOF ENGINE COOLANT DOOR PUMP/ TEMPERATURE SENDER (GAUGE) MOTOR

PUMP DRIVE GEARBOX OIL TEMPERATURE SENDER (GAUGE)

BACK-UP ALARM (DRIVE PEDAL ACTIVATED)

•

ENGINE SPEED SENSOR

FUEL LEVEL SENDER (GAUGE)

•

HYDRAULIC OIL TEMPERATURE SENDER (GAUGE) HYDRAULIC OIL TEMPERATURE SWITCH (HORN) HYDRAULIC OIL TANK PUMP INLET PRESSURE SWITCH (LIGHT)

• •

• •

•

• •

•

!

HYDRAULIC OIL LEVEL SIGHT GAUGE AND LEVEL SWITCH (EXTREME LOW ALARM)

FUEL TANK

•

•

HYDRAULIC OIL FILTER BYPASS SWITCH (LIGHT)

•

'A'

•

!'B' •

•

•

• •

FUEL TANK

OPERATOR'S CAB

BATTERIES

ENGINE OIL PRESSURE SWITCH (HORN AND HOUR METER GAUGE)

A/C COMPRESSOR HORN (SWITCH ON CONTROL PANEL) 870B-13

ALTERNATOR

ENGINE COOLANT LEVEL SWITCH (LIGHT)

SWITCH AND SENSOR LOCATIONS 6.7

ENGINE COOLANT TEMPERATURE SWITCH (HORN)

Tigercat 870B Feller Buncher

Electrical, gauges and alarms

6.8

Tigercat 870B Feller Buncher

SECTION 7 - ENGINE START AND STOP MARCH 2003

CONTENTS - SECTION 7 CIRCUIT DESCRIPTION ............................................................................... 7.2 ENGINE START CIRCUIT ............................................................................. 7.2 SCHEMATIC DIAGRAM START CIRCUIT - AT REST ...................................................................... 7.3 START CIRCUIT - BATTERY DISCONNECT SWITCH 'ON' ..................... 7.3 START CIRCUIT - RUN ............................................................................. 7.4 START CIRCUIT - RUN, PILOT RESET SWITCH 'OFF' ............................ 7.5 START CIRCUIT - RUN, PILOT RESET SWITCH 'ON' ............................. 7.5 START CIRCUIT - START ......................................................................... 7.4

Tigercat 870B Feller Buncher

Engine start and stop

ENGINE START CIRCUIT

FUEL CONTROL VALVE SOLENOID

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

The engine normally installed on these Tigercat 870B machines is a Cummins Diesel 6CT8.3C (260 HP).

••

••

For engine starting and stopping procedures refer to STARTING ENGINE and STOPPING ENGINE in SECTION 2 of the OPERATOR’S MANUAL. For correct engine speeds, refer to THROTTLE CONTROL in SECTION 2 of the OPERATOR'S MANUAL.

FUEL CONTROL VALVE 845B-D13

ENGINE FUEL CONTROL VALVE

To start engine; Turn battery disconnect switch to the ON position. Turn ignition key to the START position and releasing it to the RUN position after the engine starts.

FUSIBLE LINKS

••

CIRCUIT DESCRIPTION With the battery disconnect switch ON, current is supplied to the start solenoid contact, the positive connection on the alternator and the BATTERY (BAT) contact of the key switch (ignition switch).

••

BATTERY DISCONNECT SWITCH

•

• •

When the key switch is turned to the START (ST) position, the BATTERY (BAT) contact is connected to the START (ST) and RELAY (IGN) contacts of the key switch.

START DOOR PUMP SOLENOID RELAY RELAY 870B12

• FUEL SOLENOID

START AND FUEL SOLENOID RELAYS START RELAY

Current (voltage) then flows from the (IGN) contact through wire (2), a 15 amp circuit breaker, through RED wires (6) and (13) to energize the HOLD COIL of the fuel control valve solenoid. Current (voltage) also flows from the (ST) contact through wire (23) to energize the coil of the start relay.

The start relay contacts close and current flows from the 15 amp circuit breaker along RED wire (6) through the pilot function lockout relay, along TAN wires (9) and (16) to energize the coils of the start solenoid relay and the fuel solenoid. Energizing the start solenoid relay coil allows current to flow from the battery along RED wire (100) and TAN wire 12 to energize the start solenoid coil on the start motor to close the contacts and operate the start motor to start the engine.

Energizing the fuel solenoid coil allows current to flow from the battery along RED wire (100) and WHT wire (83) to the PULL COIL of the fuel control valve solenoid.

When the key switch is turned to the RUN position, the (BAT) contact remains connected to the (IGN) contact allowing current to continue to flow through RED wires (6) and (13) to the fuel control valve solenoid HOLD COIL and HOLD the fuel control valve OPEN to run the engine.

•

845B-D15

RELAY PANEL

the engine, the arm rest must be in the latched DOWN position to close the contacts of the pilot system limit switch. To energize the pilot system, PRESS and HOLD the pilot reset switch, this will energize the pilot function lockout relay, close the contacts and allow current to flow through wires RED (6), TAN (33) and GRN (11) to energize the pilot shut off solenoid valve and the drive brake release solenoid valve.

When the pilot reset switch is released current will continue to flow through wire TAN (95) and the diode to latch the pilot function lockout relay in the energized position and allow current to flow through wires RED (6), TAN (33) AND GRN (11) to the pilot shut off solenoid valve and the brake release solenoid valve.

In an emergency, pressing the pilot shut-off switch

Turn the key switch to the OFF position and current is (Red button) located in the cab will de-energize the removed from the (IGN) contact and RED wires (6) and pilot shut-off valve cartridge and render all pilot (13) to the fuel control valve HOLD COIL and stop the functions inoperative. engine.

For additional information on the PILOT SYSTEM refer In order to operate the machine functions after starting to SECTION 5 in THIS SERVICE MANUAL.

7.2

Tigercat 870B Feller Buncher

Engine start and stop

870B-14

START CIRCUIT - AT REST

870B-15

START CIRCUIT - AT REST BATTERY DISCONNECT SWITCH - ON

7.3

Tigercat 870B Feller Buncher

Engine start and stop

870B-16

START CIRCUIT - START IGNITION KEY - START POSITION

870B-17

START CIRCUIT - RUN IGNITION KEY - RUN POSITION

7.4

Tigercat 870B Feller Buncher

Engine start and stop

870B-18

START CIRCUIT - RUN IGNITION KEY - RUN POSITION PILOT RESET SWITCH - HELD ON ARM REST DOWN/ARM REST SWITCH - ON

870B-19

START CIRCUIT - RUN IGNITION KEY - RUN POSITION PILOT RESET SWITCH - RELEASED ARM REST DOWN/ARM REST SWITCH - ON

7.5

Tigercat 870B Feller Buncher

Engine start and stop

7.6

Tigercat 870B Feller Buncher

SECTION 9 - ENGINE ANTI-STALL M ARCH 2003

CONTENTS - SECTION 9 CONTROL MODULE IN CAB ........................................................... 9.2 ENGINE ANTI-STALL CIRCUIT ....................................................... 9.5 ENGINE ANTI-STALL CURVE.......................................................... 9.4 ENGINE ANTI-STALL VALVE ........................................................... 9.2 FAULT FINDING PROCEDURE ~ ANTI-STALL QUICK CHECK ..... 9.5 FAULT FINDING PROCEDURES, ADDITIONAL ............................. 9.6 HORSEPOWER LIMITING CONTROL GENERAL DESCRIPTION ............................................................ 9.2 LOAD SENSE; SET MARGIN PRESSURE ................ SEE SECTION 4 MAIN PUMP CONTROLLER ............................................................ 9.2 SCHEMATIC DIAGRAMS ENGINE ANTI-STALL CIRCUIT .................................................... 9.5 LOAD SENSING SYSTEM CIRCUIT DIAGRAM ........................... 9.3 SET PILOT PRESSURE ............................................. SEE SECTION 5 SPEED SENSOR, ADJUSTING ........................................................ 9.4 SPEED SENSOR ON ENGINE ......................................................... 9.2 VERIFY ANTI-STALL SETTING ................................. SEE SECTION 4

SEE ALSO SECTION 4

Tigercat 870B Feller Buncher

Engine anti-stall

HORSEPOWER LIMITING CONTROL

PILOT PRESSURE PORT 'P' CONNECTION

ENGINE ANTI-STALL SOLENOID VALVE

HORSEPOWER CALIBRATION DO NOT ADJUST

GENERAL DESCRIPTION In the past it was common to lug an engine down when several functions with high loads were used at the same time and engine stalling was avoided only by the operator. In order to prevent engine over loading, the Tigercat machine is equipped with an electronic system which detects any drop in engine speed and de-strokes the main pump to reduce the load on the engine and at the same time maintain engine speed. This is done without any input from the operator and in most cases he will be unaware of the operation of this system. The engine anti-stall system monitors four of the more demanding machine functions; swing, hoist boom, stick boom and tilt.

The track drive system is an independent closed loop system with variable displacement pumps and motors and therefore does not require the use of the engine ant-stall system.

A Linde system is used and incorporates the following components: •

•

•• •• PORT 'A' ANTI-STALL SIGNAL CONNECTION TO MAIN PUMP

TANK PORT 870B-D01

ENGINE ANTI-STALL VALVE

•• •

NO FUNCTION DO NOT ADJUST

MAIN PUMP

••

CONTROL MODULE

GAUGE TEST PORT 'A' ANTI-STALL SIGNAL PRESSURE

••

WIRING HARNESS WITH 25 PIN CONNECTOR

PORT 'A' CONNECTION FROM ANTI-STALL VALVE 'LS' CONNECTION FROM MAIN VALVE 870B-D02

•

••

CONTROL MODULE IN CAB

SPEED SENSOR

••

105-2

••

MARGIN PRESSURE ADJUSTING SCREW

• •••

A control module mounted on the rear wall of the cab interior.

251-10

••

••

MAIN PUMP CONTROLLER (LS CONTROL)

•

A speed sensor mounted on the back of the engine above the flywheel (Cummins).

•

An engine anti-stall solenoid valve mounted beside the pump drive gearbox.

•

A wiring harness.

There are two switches located on the control panel; (1) the anti-stall switch, a two position switch used to turn the anti-stall system ON/OFF and (2) the power mode switch, a two position switch used to place the anti-stall system in either an ECONOMY MODE where the engine RPM is limited to 2100 RPM under load or POWER MODE where the engine is limited to 1850 RPM under load. Placing the switch in the POWER MODE position increases the available horsepower for peak load conditions.

SPEED SENSOR ON ENGINE 9.2

Tigercat 870B Feller Buncher

870B-07

Engine anti-stall

LOAD SENSING SYSTEM CIRCUIT DIAGRAM 9.3

Tigercat 870B Feller Buncher During normal operating conditions the engine should be running at FULL throttle, the anti-stall switch in the ON position and the power mode switch in the ECONOMY position. The anti-stall switch must be in the ON position to use the power mode switch.

The engine anti-stall system can be turned OFF when required for maintenance work. The engine may then be used at less than full throttle.

The control module in the cab receives and distributes signals through a 25 pin connector which is attached to the wiring harness.

Pin connections: Refer to ENGINE ANTI-STALL CIRCUIT; •

Pin 1 is connected to "power" via the power mode switch and through a 2 amp fuse.

•

Pin 13 is connected to ground.

•

Pin 6 is jumpered to Pin 17 and both are connected to the power mode switch pole terminal '2B'.

Engine anti-stall •

Pin 11 is connected to the pole terminal '5B' on the anti-stall switch. When this switch is ON pin 11 will be connected to the anti-stall valve solenoid through the switch.

The system control module constantly monitors the engine speed and any drop in RPM from the rated 2100* or 1850* will result in a signal being sent to the anti-stall valve via wires 91, 92 and 82 from pins 11 and 16. This signal causes the antistall valve to shift and direct pressure from the pilot system to the main pump controller causing the main pump to de-stroke, "lightening" the load on the engine without affecting engine speed.

This electrical signal is a pulse width modulated signal which provides for precise modulation of the anti-stall valve and the resulting smooth control of the main pump displacement. *NOTE: 2100 RPM in ECONOMY mode.

1850 RPM in POWER mode.

ADJUSTING SPEED SENSOR

Pin 5 is jumpered to Pin 7 and both are connected to the power mode switch terminal '3'. NOTE: when the power mode switch is in the POWER position, pins (6, 17) and (5, 7) will be connected together.

1. Stop engine.

•

Pin 18 is jumpered to Pin 20.

4. Turn speed sensor OUT one full turn.

•

Pin 14 is connected to the speed sensor on the flywheel housing.

5. Tighten locknut.

•

•

Pin 16 is connected to the solenoid on the anti-stall valve.

2. Loosen locknut on speed sensor.

3. Screw speed sensor IN until it touches fly wheel.

NOTE : Before welding anywhere on the machine the 25 pin connector should be disconnected from the control module.

NOTE: THIS GRAPHIC OF THE ANTI-STALL CURVE IS ONLY A PICTORIAL REPRESENTATION FOR EXPLANATION PURPOSES. IT SHOULD NOT BE USED TO IDENTIFY OR DETERMINE ACTUAL VALUES AS THEY CAN VARY FROM ONE MACHINE TO ANOTHER.

870B-21

TYPICAL ENGINE ANTI-STALL CURVE ~ ENGINE RPM VS. PSI 9.4

Tigercat 870B Feller Buncher FAULT FINDING ~ ANTI-STALL QUICK CHECK

Engine anti-stall 2. Start engine and place throttle switch in FULL position.

The following is a quick procedure to determine if the anti-stall is functioning properly. If the machine fails any of these tests, then a more detailed diagnosis is necessary. However, there can still be other problems that are not related to the anti-stall system which are being masked.

3. Place anti-stall switch in the OFF position.

4. Activate each "Load Sense" controlled function one at a time (swing, main boom, stick boom and tilt functions).

IMPORTANT: Always ensure that the hydraulic oil is at operating temperature when performing all of the following diagnosis.

A. WHEN DOES THE PROBLEM OCCUR ?

ANSWERS: • Occurs with the system ON or OFF

'A' pressure should be less than 20 psi.

C. ANTI-STALL 'ON', THROTTLE IDLE

2. Start engine and place throttle switch in IDLE position.

The problem is likely hydraulic related which could includes the anti-stall solenoid valve on the main pump.

3. Place anti-stall switch in the ON position.

4. Place power mode switch in ECONOMY position

Occurs only with the system ON.

5. Fully activate MAIN BOOM UP function.

The problem is either related to the hydraulic system, the engine, or the anti-stall system.

Expected Results: • MAIN BOOM UP function should be inactive (boom will not lift)

B. ANTI-STALL 'OFF' 1. Connect a 0-1000 psi gauge to the ‘A’ gauge test port on main pump controller.

870B-20

•

1. Connect a 0-1000 psi gauge to the ‘A’ gauge test port on the main pump controller.

Does problem occur with anti-stall ON or OFF?

•

Expected Results: • All functions should operate normally.

•

'A' pressure should be greater than 320 psi.

ENGINE ANTI-STALL CIRCUIT 9.5

Tigercat 870B Feller Buncher D. ANTI-STALL ON, THROTTLE FULL 1. Connect a 0-1000 psi gauge to the ‘A’ gauge test port on the main pump controller.

2. Start engine and place throttle switch in FULL position.

3. Place anti-stall switch in the ON position.

4. Place power mode switch in ECONOMY position.

5. Fully activate MAIN BOOM UP function.

Expected Results: • Boom up function should operate normally.

•

'A' pressure should be less than 20 psi.

E. BEGIN OF MOVEMENT 1. Start engine and place throttle switch in IDLE position.

Engine anti-stall ADDITIONAL FAULT FINDING PROCEDURES The following procedures can be used to rule out problem associated with the engine anti-stall system. They are not in any particular order and should be done if addition diagnoses is required.

A. VERIFY ENGINE 'FULL' THROTTLE SETTING 1. Place reflector on engine crank shaft pulley for use with a phototach.

2. Start engine and place throttle switch in FULL position.

3. Measure engine no load FULL throttle speed with a phototach.

The engine speed should be verified with a phototach and the measured speed should be compared to the tach. on the instrument panel.

B. VERIFY ENGINE POWER

2. Place anti-stall switch in the ON position.

3. Place power mode switch in ECONOMY position.

NOTE: Before performing this procedure make sure that all relevant PRESSURES and SPEEDS have been set correctly.

4. Fully activate MAIN BOOM UP function.

(Initially, the boom should not move)

Example:

5. Increase the throttle until the boom begins to lift.

•

SWING SPEED AND SWING PRESSURE SETTINGS.

6. Measure the engine speed when the boom starts to lift. The transition state of the anti-stall system from fully active to completely inactive is very narrow. It is necessary to approach this point very slowly.

•

MAIN SYSTEM (L.S.) PRESSURE SETTINGS.

•

CLAMP VALVE MAIN RELIEF.

•

Refer to the 870B PRESSURE SETTINGS CHART in SECTION 4 of THIS SERVICE MANUAL for correct values.

Expected Results: The boom should not move initially.

•

As the engine speed approaches FULL, the boom should begin to move.

•

The point where the boom begins to move should be between 1950 to 2050 RPM.

1. Perform procedure 'A' above to verify tach on instrument panel is accurate.

2. Start engine and place throttle switch in FULL position.

3. Place anti-stall switch in the OFF position.

NOTE: The engine power mode switch is inoperative when the anti-stall switch is in the OFF position.

4. Place swing brake switch in the ON position.

5. Activate the SWING function fully.

• Measure the engine speed.

6. Activate the SWING function fully.

Bottom the TILT cylinder.

• Measure the engine speed.

9.6

Tigercat 870B Feller Buncher

Engine anti-stall G. SOLENOID VALVE COIL

7. Activate the SWING function fully.

Hold a CLAMP function over relief.

• Measure the engine speed.

1. Remove DIN connector from anti-stall solenoid valve.

8. Activate the SWING function fully.

Bottom the TILT cylinder.

Hold a CLAMP function over relief.

• Measure the engine speed.

2. Measure resistance of solenoid coil.

• The resistance should be 6.6 ±2 ohms.

H. SPEED SENSOR OUTPUT 1. Remove 25 pin connector from anti-stall control module.

• The engine speed should always be above "rated speed" of 2100 RPM. If engine speed falls below rated speed during the above tests, the problem is not likely to be with the engine anti-stall system.

2. Start engine and place throttle switch in FULL position.

3. Measure the AC voltage across 13 and 14 on connector.

• The speed sensor output should be greater than 5VAC.

C. PILOT PRESSURE. 1. Ensure pilot pressure is correct.

To verify PILOT PRESSURE refer to PILOT SYSTEM in SECTION 5 of THIS MANUAL.

The speed sensor on the Cummins 'C' engine should be a fixed distance from the flywheel. Do not use the voltage to adjust this distance. Refer to ADJUST SPEED SENSOR in THIS SECTION.

D. MARGIN PRESSURE 1. Ensure margin pressure is correct.

To verify MARGIN PRESSURE refer to SET MARGIN PRESSURE in SECTION 4 of THIS MANUAL. E. ELECTRICAL POWER TO ANTI-STALL CONTROL MODULE.

SPEED SENSOR WIRES 1. Remove 25 pin connector from anti-stall control module.

2. Measure resistance between pins 13 and 14 on connector • The resistance should be: 960 ±150ohms

1. Remove 25 pin connector from anti-stall control module.

2. Start engine and place throttle switch in IDLE position.

3. Check for shorts from pin 14 to chassis.

(Pin 13 is connected to ground)

3. Measure DC voltage across pins 1 and 13 on connector.

J. SPEED SENSOR COIL 1. Remove 25 pin connector from anti-stall control module.

• Voltage should be 13 ± 2 VDC. F.

I.

SOLENOID VALVE WIRES.

2. Measure resistance of speed sensor coil.

• The resistance should be: 960 ±150 ohms.

1. Remove 25 pin connector from anti-stall control module.

2. Measure resistance between pins 11 and 16 on connector.

• The resistance should be 6.6 ±2 ohms 3. Check for wiring and harnesses short circuiting to chassis.

9.7

Tigercat 870B Feller Buncher

Engine anti-stall

9.8

Tigercat 870B Feller Buncher

SECTION 11 - TRACK DRIVE CONTENTS - SECTION 11 BRAKE RELEASE VALVE, DRIVE MOTOR .............................................................. 11.11 CIRCUIT DIAGRAM ....................................................................................................... 11.9 DRIVE MOTOR BRAKE RELEASE VALVE ...................................................................................... 11.11 DESCRIPTION ........................................................................................................... 11.6 REMOTE POR VALVE ............................................................................................ 11.10 SCHEMATIC DIAGRAM ............................................................................................ 11.6 START-UP PROCEDURE ........................................................................................ 11.11 DRIVE PUMP DESCRIPTION ........................................................................................................... 11.4 SCHEMATIC DIAGRAM ............................................................................................ 11.5 HYDROSTATIC DRIVE SYSTEM ................................................................................. 11.3 POR VALVE, MOTOR ................................................................................................ 11.10 PRESSURE SETTINGS, DRIVE CIRCUIT CHECK MOTOR POR ADJUSTMENT ..................................................................... 11.15 CROSSLINE RELIEF VALVES, DRIVE PUMP ........................................................ 11.13 DRIVE PUMP CROSSLINE RELIEF VALVES (NON-ADJUSTABLE ........................ 11.13 MOTOR PILOT STROKING ADJUSTMENT .............................................................. 11.19 SET DRIVE MOTOR POR VALVE ........................................................................... 11.14 SET MOTOR MAXIMUM DISPLACEMENT .............................................................. 11.17 SET MOTOR MINIMUM DISPLACEMENT ............................................................... 11.19 SET PUMP MAXIMUM DISPLACEMENT- (PUMP FLOW) LOW SPE ..................... 11.18 SET PUMP POR VALVES 1, 2 AND 3 .................................................................... 11.12 SUMMARY: SET DRIVE MOTOR POR VALVE ...................................................... 11.15 SUMMARY: SET PUMP POR VALVES .................................................................. 11.13 SUMMARY: TRACK SPEED SET-UP PROCEDURE .............................................. 11.22 TRACK SPEED SET-UP PROCEDURE .................................................................. 11.16 SCHEMATIC DIAGRAMS DRIVE CIRCUIT ......................................................................................................... 11.9 DRIVE MOTOR ......................................................................................................... 11.6 DRIVE PUMP ............................................................................................................ 11.5 TRACK COMPONENTS BOTTOM ROLLER RETAINING BOLTS ................................................................... 11.26 IMPORTANT TRACK DRIVE NOTES ......................................................................... 11.2 MEASURING TRACK SAG ...................................................................................... 11.24 TRACK SAG ADJUSTMENT ................................................................................ 11.25 OPERATING THE MACHINE ................................................................................... 11.24 TORQUING UNDERCARRIAGE BOLTS .................................................................. 11.25 TRACK SHOE RETAINING BOLTS ......................................................................... 11.25 WEAR LIMITS BOTTOM ROLLER WEAR ................................................................................... 11.27 BUSHING WEAR, OUTSIDE DIAMETER ............................................................ 11.27 IDLER WEAR ...................................................................................................... 11.28 PIN AND BUSHING WEAR .................................................................................. 11.27 TRACK LINK WEAR ............................................................................................ 11.26 TRACK SHOE GROUSER HEIGHT WEAR ......................................................... 11.26 TRACK SLIDE WEAR ......................................................................................... 11.28 UNDERCARRIAGE ASSEMBLY ................................................................................... 11.2

JUNE 2003

Tigercat 870B Feller Buncher IMPORTANT TRACK DRIVE NOTES

Track drive STRAIGHT TRAVEL

NEW MACHINE

If the machine does not travel straight, the right and left track speeds are not synchronized. Refer to TRACK SPEED SET-UP PROCEDURE in THIS SECTION.

Before driving a new machine ensure that track sag is set correctly. Track sag may be set less than specified for shipping purposes. The correct track sag must be adjusted once a machine has been delivered to the job sight and operating in the accumulated soil buildup in the undercarriage.

Check speeds of each track and follow the set-up procedures closely to obtain straight travel.

TRACK SAG The track sag dimension is very important and should be checked regularly. A 50% increase in the life of the track assembly can be realized, particularly in bushing O/D wear and 'track pitch' by maintaining the correct amount of track sag. A track that is too tight will wear out significantly faster due to increased tension in the chain.

Refer to MEASURING TRACK SAG in THIS SECTION.

TRACK SLIDES/GUIDES

ROTARY MANIFOLD IDLER ASSEMBLY

• • •

UNDERCARRIAGE LOWER HINGED ACCESS COVER

•

UNDERCARRIAGE

•

• •

• •

•

•

INSPECTION COVERS

•

•

TRACK DRIVE GEARBOX

• DRIVE SPROCKET

870B-22

LOWER ROLLERS

•

• DRIVE MOTOR

•

TRACK GUARDS

UNDERCARRIAGE ASSEMBLY 11.2

TRACK ASSEMBLY

Tigercat 870B Feller Buncher HYDROSTATIC DRIVE SYSTEM

Track drive

The primary components of the 870B hydrostatic drive system are two hydraulic pumps and two hydraulic motors connected together by hydraulic hoses. The pump converts the mechanical power of the diesel engine into hydraulic power. This high pressure flow of hydraulic oil is then transmitted to the hydraulic motors through one set of connecting hoses (high pressure side). The motors then converts the hydraulic power back into mechanical power to propel the machine. Oil from the two motors is then returned to the pumps through the other set of connecting hoses (low pressure side) thereby completing a continuous closed hydraulic circuit.

A hydraulic system is termed closed circuit when the hydraulic oil returning from the motors is fed straight back to the pumps without first returning to tank. When the machine is travelling forward, one side of the closed circuit "loop" is a high pressure supply while the other side is a low pressure return.

The supply and return will alternate from side to side of the closed loop as the direction of travel of the vehicle changes from forward to reverse.

The closed circuit is constantly being charged with filtered hydraulic oil by the charge pump via the charge/pilot/filter manifold and at connections on each drive pump. To allow for this replenishment of clean oil into the loop circuit, controlled internal oil leakage takes place within the cases of the motors. The pumps use the charge oil to flush the case for cooling purposes.

The oil is then returned to tank via the case drain ports. This constant flow of filtered oil into the loop reduces contaminant buildup and assists with cooling.

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.

Each hydraulic motor is connected to a triple reduction planetary gearbox on each track side frame. The gearboxes have an integral spring apply, hydraulic-release, multi-disc brake which is automatically released whenever the drive system is pressurized.

TO VEHICLE DRIVE (LEFT TRACK)

LEFT HAND DRIVE MOTOR

LEFT HAND DRIVE PUMP HIGH PRESSURE SUPPLY

FROM DIESEL ENGINE

LOW PRESSURE RETURN FILTERED LOOP SUPPLY OIL (CHARGE PRESSURE)

(CASE) DRAIN TO TANK

(CASE) DRAIN TO TANK

(CASE) DRAIN TO TANK RIGHT HAND DRIVE PUMP HIGH PRESSURE SUPPLY

RIGHT HAND DRIVE MOTOR

870B-34

TO VEHICLE DRIVE (RIGHT TRACK)

FROM DIESEL ENGINE

LOW PRESSURE RETURN FILTERED LOOP SUPPLY OIL (CHARGE PRESSURE)

(CASE) DRAIN TO TANK

TYPICAL CLOSED CIRCUIT "LOOP" HYDRAULIC TRACK DRIVE SYSTEM 11.3

Tigercat 870B Feller Buncher

Track drive

HYDROSTATIC DRIVE PUMP Two hydrostatic drive pumps are used to supply the left and right independent track drive systems with hydraulic oil. The pumps are identical as far as their operating functions are concerned. The RIGHT track drive pump is driven off the lower left pad on the pump drive gearbox. The LEFT track drive pump is driven off the lower right pad. This left track drive pump has a power take off adapter (PTO) which is used to drive the saw pump.

The drive pumps are variable displacement, swashplate, in line axial piston type pumps. The volume and direction of oil flow from the piston pump

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

The charge pump is a separate fixed displacement, internal gear type pump. The charge pump provides charge oil (make-up oil) for the hydrostatic drive closed circuit systems as well CHARGE/CLAMPS/WRIST PUMP

HYDRAULIC OIL TANK

MAIN PUMP (LOAD SENSING)

• •• •

•

•• •

•

•• SAW PUMP

GAUGE TEST PORT Mp

GAUGE TEST PORT Ms RIGHT TRACK DRIVE PUMP

870B-43

PUMPDRIVE ASSEMBLY 11.4

LEFT TRACK DRIVE PUMP

SOME HOSES AND TUBES REMOVED FOR CLARITY

Tigercat 870B Feller Buncher

Track drive

as supplying the pilot system. Oil from the charge pump first passes through the charge/pilot/filter manifold where it is regulated to 450 psi. The charge oil is used to flush the loop, to supply drive pump and motor servo control pressure and to supply pilot pressure to the rest of the machine controls.

Pressing either or both drive pedals in forward or reverse directs pilot oil (450 psi) 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 will determine 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 pedal. When the drive foot pedals are at rest in the neutral position, charge oil is not supplied to the swashplate. The swashplate therefore remains in the neutral position and no oil is pumped by the piston pump.

causes the swashplate control cylinder to destroke the swashplate and reducing pump flow.

Two high pressure crossline relief valves on each pump control the high pressure side of the loop by "dumping" oil into the low pressure side of the loop when the pressure rises above the valve's preset value. These valves are factory set and are none adjustable. These crossline relief valves always dump oil from the high pressure to the low pressure side of the closed circuit in order to keep the hydraulic oil within the closed circuit system.

Each hydrostatic piston pump is equipped with a pressure override (POR.) control to protect the closed loop hydrostatic drive components from excessive pressure. There are three valves involved labelled valves 1, 2 and 3. When the tractive effort requirements of the vehicle become excessive the pressure on the high side of the closed loop can reach maximum. At this point valve 1 or valve 2 depending on direction of travel react to this rise in pressure and shift to open one side of the swashplate control valve to tank (case drain). This FORWARD MAX. DISPLACEMENT ADJUSTING SCREW

VALVE (1) ADJUSTING SCREW

•

TRACK DRIVE PUMP SCHEMATIC VALVE (3) ADJUSTING SCREW

PILOT PORT

•

REVERSE MAX. DISPLACEMENT ADJUSTING SCREW

•

• •

PILOT PORT

VALVE (2) ADJUSTING SCREW

• •

PUMP POR. VALVE 2

•

• PUMP POR. VALVE 1

870B-25

PUMP POR. VALVE 3

•

CROSSLINE RELIEF VALVE

• •

GAUGE TEST PORT

•

•

870B-27

• •

CHARGE PRESSURE 'IN'

DRIVE PUMP 11.5

CROSSLINE RELIEF VALVE

BRAKING PRESSURE SHUT-OFF VALVE

GAUGE TEST PORT

Tigercat 870B Feller Buncher Each hydrostatic pump is also equipped with a three position braking pressure shut-off valve (motor POR. pressure selector). Pressing either or both drive pedals in forward or reverse directs pilot oil (450 psi) to shift the spool in this valve and connects one side of the loop (eg; 'A' side) to the motor POR valve port H1 or H2.

When the pressure rises above the motor POR setting, eg; travelling up a steep grade, the spool shifts in the motor POR valve reduces pilot pressure to the motor displacement control and shifts the drive motor towards maximum displacement. (increased torque/slower travel speed).

The breaking pressure shut-off valve determines which line of the closed loop circuit is to be used for the motor POR, depending on the driving direction.

Should the grade change to a down hill situation while continuing to travel in the same direction, the load on the system will lighten and the pressure in the loop (eg; 'A' side) will drop. Since the drive pedal is still being operated the braking pressure shut-off valve will remain shifted in the same direction, causing the motor POR valve to shift and will allow the drive motors to shift towards minimum displacement. (decreased torque/increased speed) This feature is to prevent a sudden braking action in a down hill driving situation.

Track drive HYDROSTATIC DRIVE MOTOR The drive motor is a variable displacement swashplate design. The motor is interchangeable from side to side.

The motor rotating group consists of a cylinder block (J) with nine pistons (I) and an output shaft (A) that is splined to the cylinder block.

Supply oil from the drive control valve enters the motor through the cover (N) to the pistons. During operation, high pressure supply oil enters the piston bores in the cylinder block (J). This forces the pistons against an angled swashplate (E).

Piston sliding action causes the rotating group to turn. The cylinder block is splined to the output shaft (A) which causes the output shaft to turn.

During the second half of the motor rotation, low pressure is discharged as the pistons ride up to a higher position on the swashplate. To reverse rotation, oil flow is reversed. During operation a small amount of supply oil flows through the centre of each piston. This oil lubricates the piston to slipper (F) joint and the slipper to swashplate area.

Refer to PRESSURE SETTINGS in SECTION 4 of THIS SERVICE MANUAL for a complete list of pressure set points discussed above.

870B-24

TRACK DRIVE MOTOR SCHEMATIC

High pressure supply oil also flows through a tube to lubricate the swashplate to bearing shell area.

Normal leakage and lubrication oil aid in flushing and cooling the motor during drive operation.

The swashplate (E) angle is changed by the minimum displacement piston (O) and maximum displacement piston (L). When supply oil acts on the minimum displacement piston (O), the motor runs at its highest speed. When supply oil acts on the maximum displacement piston, the motor runs at its slowest speed. The maximum displacement piston is larger than the minimum piston and will hold the motor in maximum displacement when equal pressure acts on both pistons.

11.6

Tigercat 870B Feller Buncher

Track drive The drive motor may be operated in two ranges;

NOTE: Swashplate angle (motor displacement) is limited by the minimum and maximum displacement pistons contacting the minimum and maximum displacement adjustment stops located on the front cover. For minimum displacement, the maximum displacement piston contacts the minimum displacement adjustment stop. For maximum displacement, the minimum displacement piston contacts the maximum displacement adjustment stop.

MAXIMUM DISPLACEMENT = 135cc/rev.

MINIMUM DISPLACEMENT = app. 70cc/rev.

These two ranges are controlled by a solenoid pilot valve on the pilot manifold which is operated by the TRACK (LOW/DRIVE) switch in the cab. In the LOW position the solenoid on the pilot valve is energized and the motor is in its maximum displacement mode which will give the slowest speed and maximum tractive effort.

In the DRIVE position the motor at minimum

SLIPPER

RETAINER

BALL GUIDE

G

F

PISTON

CYLINDER BLOCK

I

H

J

SWASHPLATE

K PIN

E SEAL

D

L

SPACER

•• •

C RETAINING RING

•

•

•

•

MINIMUM DISPLACEMENT ADJUSTMENT STOP

•

••

M SHIMS

•

N COVER

•

•

•

• •

A

WEAR SLEEVE

••

•

• ••

B

SHAFT

MAXIMUM DISPLACEMENT PISTON

•

•

MAXIMUM DISPLACEMENT ADJUSTMENT STOP

S

BEARING SHELL

AQ051-2

CROSS SECTION OF DRIVE MOTOR

R SPRING

MINIMUM

O DISPLACEMENT

P

PISTON

PORT (L) DRAIN CONNECTION ('U' PORT ON RH. MOTOR)

•

MINIMUM DISPLACEMENT ADJUSTMENT STOP 6mm ALLEN KEY 19mm WRENCH

PORT 'E' PILOT PRESSURE DISPLACEMENT CONTROL FROM BRAKE RELEASE VALVE

• •

•

'B' SIDE

•

MAXIMUM DISPLACEMENT ADJUSTMENT STOP 6mm ALLEN KEY 19mm WRENCH

'B' PORT PORT 'X' PILOT PRESSURE FROM POR VALVE MOTOR PILOT STROKING ADJUSTMENT

•

'A' SIDE

'A' PORT

• DRIVE MOTOR COVER

DRIVE MOTOR FRONT COVER AQ051.AI

DRIVE MOTOR 11.7

Tigercat 870B Feller Buncher

Track drive

displacement position which will give the fastest speed. When in this higher speed mode the motor will automatically de-stroke in the event that a high load is encountered, e.g. a short grade or obstacle. This de-stroking is controlled by the remote POR valve by controlling the displacement control signal to the motor.

CASE DRAIN LINE TO TANK

'L' PORT DRAIN CONNECTION ('U' PORT ON RH. MOTOR)

•

DRAIN LINE FROM LH. COUNTERBALANCE VALVE (LEVELLER ONLY)

PILOT PRESSURE FROM BRAKE RELEASE VALVE

• TO BRAKE CONNECTION

••

•

SYSTEM PRESSURE PORT 'B'

'B' SIDE

•

•

••

MINIMUM DISPLACEMENT ADJUSTMENT STOP 6mm ALLEN KEY 19mm WRENCH

••

•• ••

MOTOR PILOT STROKING ADJUSTMENT

PORT 'E' PILOT PRESSURE DISPLACEMENT CONTROL FROM BRAKE RELEASE VALVE

SYSTEM PRESSURE PORT 'A' PORT 'X' MOTOR DISPLACEMENT CONTROL

'A' SIDE

PILOT PRESSURE FROM POR. VALVE

•• MAXIMUM DISPLACEMENT ADJUSTMENT STOP 6mm ALLEN KEY 19mm WRENCH

DRIVE MOTOR - L.H. SIDE SHOWN 391-07

11.8

Tigercat 870B Feller Buncher

Track drive

FROM FOOT PEDAL VALVES

TO DRIVE MOTORS

870B-23

TRACK DRIVE CIRCUIT DIAGRAM 11.9

Tigercat 870B Feller Buncher HYDRAULIC OIL TANK

Track drive PILOT OIL CONNECTION PORT 'P'

• ••

HYDRAULIC OIL LEVEL SIGHT GAUGE/TEMP. GAUGE/LEVEL SWITCH

••

•• SOLENOID VALVE CARTRIDGE

•

BRAKE LINE CONNECTION PORT 'BR'

•

•

PILOT PORT 'MX'

•• SOME HOSES REMOVED FOR CLARITY

••

(3) MOTOR POR. VALVE

DRAIN TO TANK PORT 'T'

(1) BASE MANIFOLD

• •

BRAKE RELEASE PILOT CONNECTION PORT 'D'

•

DRIVE MOTOR BRAKE RELEASE VALVE

GAUGE TEST PORT 'B'

•

••

••

GAUGE TEST PORT DC2

(2) SANDWICH MANIFOLD WITH "PHANTOM" RELIEF VALVE

DRIVE MOTOR REMOTE POR. VALVE AND BRAKE RELEASE VALVE gauge test port connection (port 'B') which is used DRIVE MOTOR REMOTE POR VALVE to connect a pressure gauge when setting the The drive motor POR valve is made up of three motor POR valve. main components; (3) The motor POR valve portion is used in (1) A base manifold which, with the aid of three conjunction with (1) and (2) to control the pilot integral shuttle valves controls the flow of pilot oil signal pressure (motor displacement control). The from the two drive foot pedal valves to the pumps, POR valve is adjustable and is set to open or motors, braking pressure shut-off valve and the close at a point below maximum system pressure. brake release valve. The manifold also contains a This will control displacement of the drive motors gauge test port connection (port DC2 or DC1) and compensate for load variations on the drive which is used to connect a pressure gauge when system. It is important that this POR valve is setting the motor POR valve. always at the correct setting. Refer to SET MOTOR POR in THIS SECTION. (2) A sandwich manifold containing a "phantom" relief valve and an integral shuttle valve. The Control of the POR valve is via an external and/or manifold and shuttle valve receive a system internal pilot port connection. The external one pressure signal from the braking pressure shut-off (port MX) receives pilot oil (450 psi) from the valve(s) (motor POR pressure selector) on the LOW/DRIVE solenoid operated pilot valve on the drive pumps and redirects the signal to the end of pilot manifold which is controlled by a LOW/ the motor POR valve spool to shift the spool. The DRIVE switch in the cab. When energized (LOW "phantom" relief valve is used for setting the mode) pilot oil is directed to shift and hold the motor POR valve and under normal operating POR spool in the POR valve and connect the conditions is screwed IN to prevent from drive motor displacement cylinder to tank placing operating. The sandwich manifold also contains a the motor at maximum displacement. The 870B-D06

11.10

Tigercat 870B Feller Buncher internal port connection receives signal pressure via the base manifold (1) from the braking pressure shut-off valve (motor POR pressure selector) on the drive pump(s), when this signal pressure (system pressure) rises above the POR setting the POR spool shifts to direct pilot oil away from the drive motor displacement cylinder and shifts the motor towards maximum displacement.

NOTE: When the LOW/DRIVE switch is in LOW, the motor displacement control will be held low and the motor will be kept at maximum displacement.

Track drive DRIVE MOTOR START-UP PROCEDURE IMPORTANT: The drive motor will be damaged if is not filled with oil before operating the drive function. This procedure must be performed whenever a new drive motor or drive pump is installed or whenever oil has been drained from the motor.

1. Disconnect drive motor drain line at swivel elbow on top of motor, port 'U' on RH. motor port 'L' on LH. motor.

••

DRIVE MOTOR BRAKE RELEASE VALVE

••

••

••

The brake release valve consists of a solenoid operated valve cartridge and a pilot operated valve cartridge housed in an aluminum body.

It's function is to control the multi disc brakes housed inside each drive planetary gearbox by applying or releasing pilot pressure from the spring applied brake cylinder(s). When either of the drive foot pedals are pressed, pilot oil is directed via the valve base manifold (1) to the brake release valve port 'D' where pilot oil (450 psi) shifts the pilot operated valve spool and directs pilot pressure to the brake cylinders to release the brakes. Releasing the drive foot pedals will remove pilot pressure from to the brake release valve causing the spool to shift and direct pilot oil from the brake cylinders to tank applying the brakes (spring applied).

For the brake release valve to function the pilot solenoid on the brake release valve must be energized, this occurs when the pilot system is activated. Refer to PILOT SYSTEM in THIS MANUAL. If either of the pilot shut-off switches in the cab are activated, eg; the left armrest is lifted or the red pilot OFF is pressed, current is removed from the solenoid valve on the brake release valve causing the spool to shift and direct pilot oil from the brake cylinders to tank via port 'T' and apply the brakes.

SWIVEL ELBOW

DRAIN PORT 'U' PORT 'L' ON LH. MOTOR CASE DRAIN LINE TO TANK DRAIN LINE FROM RH. COUNTERBALANCE VALVE (LEVELLER ONLY)

870B-D09

DRIVE MOTOR DRAIN - (RH SHOWN)

2. Install plug in elbow to minimize loss of oil.

3. Remove port adapter from motor drain port.

4. Fill motor with oil through the drain port. Add oil slowly until level is to the top of drain port.

5. Install port adapter and re-connect swivel elbow.

6. Raise each track off the ground and run each drive motor slowly for three track revolutions to remove air from the drive circuit.

ANGLE TO BE BETWEEN 90° & 110°

845-12

11.11

LIFTING TRACK

Tigercat 870B Feller Buncher DRIVE CIRCUIT PRESSURE SETTINGS The following instructions will explain in detail how to adjust:& PUMP POR - (MAX. PUMP PRESSURE) • 4 ADJUSTMENTS & PUMP CROSSLINE RELIEF VALVES • 4 VALVES, NON-ADJUSTABLE & MOTOR POR (BEGIN OF REGULATION) • 1 ADJUSTMENT USING TWO VALVES

Track drive 4. On POR valves (1) and (2) on both drive pumps, loosen locknut on adjusting screws and turn adjusting screws OUT taking care not to completely remove the screws, Do not unscrew more than 19 mm maximum visible thread).

POR VALVE (1) ADJUSTING SCREW

• PILOT PORT 'Y'

1. Raise hydraulic oil temperature to no higher than 100°F or 40°C. NOTE: Do not heat to operating temperature prior to starting this procedure, significant heating will occur during this test. Constantly monitor hydraulic oil temperature during this test procedure.

2. Remove both LEFT and RIGHT drive motor inspection covers.

870B-27

•

• PILOT PORT 'Z'

NOTE: The following procedure deals with setting FOUR adjustments, the LEFT REVERSE adjustment is detailed below.

Park machine on flat solid ground and place felling head securely on the ground before performing any service work.

POR VALVE (2) ADJUSTING SCREW

••

•

& HIGH SPEED TRAVEL - 4 ADJUSTMENTS & LOW SPEED TRAVEL - 2 ADJUSTMENTS SET PUMP POR VALVES 1, 2 AND 3 Pressure Setting: 4750 - 4900 psi.

POR VALVE (3) ADJUSTING SCREW

DRIVE PUMP POR

19mm

5. POR valve (3) adjusting screw is held in place by two jamnuts, loosen the jamnuts and unscrew the adjusting screw all the way out, it is mechanically restricted from being completely removed. Tighten jamnuts. POR valve (3) is now set and will remain in the open position.

6. Install 0 - 10,000 psi pressure gauges onto gauge test ports Mp and Ms on the LH. drive pump.

CROSSLINE RELIEF VALVES

3. Disconnect LEFT and RIGHT brake lines to track drive gearboxes. Plug hose with size 06 JIC plug and cap port adapter on hose to gearbox but do not completely seal.

•

• •

870B-27

•

GAUGE TEST PORTS Mp & Ms

DRIVE PUMP GAUGE TEST PORTS

7. Start engine set throttle switch to FULL DISCONNECT BRAKE LINE AT PORT ON TRACK DRIVE GEARBOX.

..

8. From the operator's seat, lower left armrest and press the PILOT RESET switch to activate pilot system.

9. Place ANTI-STALL switch to OFF position.

10. Place DRIVE/LOW switch to DRIVE.

• 870B-D09

DRIVE MOTOR/GEARBOX (RH. SHOWN)

11. TEST - Activate LEFT track drive foot pedal in both FORWARD and REVERSE directions to ensure that the track does not move.

11.12

Tigercat 870B Feller Buncher

Track drive 20. Remove pressure gauges and wipe up any spills.

WARNING

21. Replace both LEFT and RIGHT drive motor inspection covers.

Exercise extreme care when performing this set-up procedure, machine may move.

Ensure that there are no personnel either in front or behind the machine.

SET DRIVE PUMP CROSSLINE RELIEF VALVES

12. With the aid of an assistant, activate LEFT track drive foot pedal in REVERSE position, NOTE: The system pressure will be unstable, this is an expected pump reaction.

Pressure Setting: 4750 - 4900 psi.

These two valves on each of the drive pumps are factory set and are non-adjustable.

SUMMARY:

CAUTION

SET PUMP POR VALVES

While the foot pedal is pressed, oil will flow over the pump crossline relief valves causing the drive circuit to heat up. Monitor hydraulic oil temperature during this procedure.

While monitoring the pressure gauge at 'Mp' port SLOWLY turn the adjusting screw for POR valve (1) on LEFT drive pump IN until the point where the pressure reading just stabilizes, tighten locknut on adjusting screw. At this stage the engine will be under slight load and the gauge should show approximately 4750 psi (crossline relief pressure setting).

NOTE: The aim is to achieve stability of system pressure and not set a specific psi. value.

13. Tighten locknut on adjusting screw taking care not to disturb the set point.

14. POR valve (1) on LEFT drive pump is now set for LEFT TRACK/REVERSE function.

15. POR valve (2) on LEFT drive pump: Repeat paragraph (12) using LEFT FORWARD drive pedal to set LEFT TRACK/FORWARD function.

16. POR valve (1) on RIGHT drive pump: Repeat paragraph (12) using RIGHT REVERSE drive pedal to set RIGHT TRACK/ REVERSE function.

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

16.

17.

18.

19.

20.

21.

22.

17. POR valve (2) on RIGHT drive pump: Repeat paragraph (12) using RIGHT FORWARD drive pedal to set RIGHT TRACK/ FORWARD function.

18. Stop engine.

19. Re-connect brake line(s) to both gearboxes.

11.13

Set hydraulic oil temp. 100°F or 40°C. Remove both motor inspection covers Disconnect LEFT and RIGHT brake lines Turn OUT POR valves (1) and (2) Turn out POR valve (3) Install 0 - 10,000 psi gauges on LH. drive pump ports Mp and Ms Start engine, FULL throttle Activate pilot system Place ANTI-STALL switch OFF Place DRIVE/LOW switch in DRIVE Press LEFT track drive pedal REVERSE Set POR valve (1) on LEFT drive pump Press LEFT track drive pedal FORWARD Set POR valve (2) on LEFT drive pump Press RIGHT track drive pedal REVERSE Set POR valve (1) on RIGHT drive pump Press RIGHT track drive pedal FORWARD Set POR valve (2) on RIGHT drive pump Stop engine Re-connect brake lines Remove pressure gauges Replace both motor inspection covers

Tigercat 870B Feller Buncher

Track drive

HYDRAULIC OIL TANK

• GAUGE TEST PORT 'B'

• PILOT PORT 'MX'

• ••

•

••

••

BASE MANIFOLD

•• •

MOTOR POR. VALVE

SOME HOSES REMOVED FOR CLARITY 870B-D07

GAUGE TEST PORT DC2

•

ADJUSTING SCREW

••

DRIVE MOTOR REMOTE POR. VALVE

SET DRIVE MOTOR POR VALVE Pressure setting 3600 psi.

1. Raise hydraulic oil temperature to no higher than 100°F or 40°C. NOTE: Do not heat to operating temperature prior to starting this procedure, significant heating will occur during this test. Constantly monitor hydraulic oil temperature during this test procedure.

NOTE: The following procedure deals with setting ONE adjustment on the single POR valve which is shared by BOTH motors.

The motor POR valve is located in the upper frame of the machine accessible through the RH. engine enclosure door and is comprised of 3 sections: 1 Base manifold 2 Sandwich manifold 3 POR valve For a description of this POR valve refer to DRIVE MOTOR POR VALVE in THIS SECTION. Park machine on flat solid ground and place felling head securely on the ground before performing any service work.

SANDWICH MANIFOLD WITH "PHANTOM" RELIEF VALVE ADJUSTING SCREW

2. Remove both LEFT and RIGHT drive motor inspection covers.

3. Disconnect LEFT and RIGHT brake lines to track drive gearboxes. Plug hose with size 06 JIC plug and cap port adapter on hose to gearbox but do not completely seal.

4. Install a 0 - 5000 psi pressure gauge on gauge test port 'B' (high pressure sense).

5. Install a 0 - 1000 psi pressure gauge on gauge test port 'DC2'.

11.14

Tigercat 870B Feller Buncher

Track drive 15. Stop engine.

16. Re-connect brake line(s) to both gearboxes.

17. Remove pressure gauges, wipe up any spills.

18. Replace both LEFT and RIGHT drive motor inspection covers.

DISCONNECT BRAKE LINE AT PORT ON TRACK DRIVE GEARBOX.

CHECK MOTOR POR ADJUSTMENT 1. Place DRIVE/LOW switch to DRIVE. 2. Start engine set throttle switch to FULL

3. Drive machine at FULL speed in a straight line.

• 870B-D09

WARNING

DRIVE MOTOR/GEARBOX (RH. SHOWN) 6. Loosen locknut on POR valve adjusting screw and turn adjusting screw all the way IN. CAUTION: To prevent damaging the POR valve, Only turn adjusting screw IN until lightly seated. Tighten locknuts.

7. Start engine, set throttle switch to IDLE

....

.

8. From operator's seat, lower left armrest and press PILOT RESET switch to activate pilot system.

9. Place ANTI-STALL switch to OFF position.

10. Place DRIVE/LOW switch to DRIVE. 11. Fully press LEFT or RIGHT foot pedal and perform steps 12 and 13.

Ensure that test area around the machine is clear of personnel.

4. Release one pedal; Machine will turn, while turning machine should slow down.

5. If the machine does not slow down and the engine shows signs of being under load, then the motor POR is set to HIGH. 6. If the outside track becomes very slow, the motor POR is set too LOW. 7. If the machine does not perform as expected, Refer to SET DRIVE MOTOR POR in THIS SECTION. 8. Stop engine.

SUMMARY: CAUTION

SET DRIVE MOTOR POR VALVE

1.

2.

3.

4.

5.

12. With the aid of an assistant, loosen locknut on 6.

PHANTOM relief valve adjusting screw and turn 7. adjusting screw out until reading on pressure 8. gauge at 'B' test port reads 3600 psi. Tighten 9. locknut.

10.

13. Loosen locknut on POR valve adjusting screw 11. and turn adjusting screw out until reading on pressure gauge on 'DC2' test port reads 120 psi. 12.

Tighten locknut.

13.

14.

14. Loosen locknut on PHANTOM relief valve adjusting screw and turn adjusting screw in until 15. lightly seated, Screw out 1/8 turn. Tighten 16. locknut. This adjustment position will prevent the 17. phantom relief valve from operating during normal 18. operation.

While the foot pedal is pressed, oil will flow over the pump crossline relief valves causing the drive circuit to heat up. Monitor hydraulic oil temperature during this procedure.

11.15

Set hydraulic oil temp. 100°F or 40°C. Remove both motor inspection covers Disconnect LEFT brake line Install 0 - 5000 psi gauge on test port 'B' Install 0 - 1000 psi gauge on test port 'DC2' Turn POR valve adj. screw all the way IN Start engine, LOW IDLE Activate pilot system Place ANTI-STALL switch OFF Place DRIVE/LOW switch to DRIVE Fully press LEFT or RIGHT drive pedal and: Set PHANTOM relief valve, Gauge on 'B' port Set POR valve, gauge on 'DC2' test port Re-set PHANTOM relief valve Stop engine Re-connect brake line Remove pressure gauges Replace both motor inspection covers

Tigercat 870B Feller Buncher TRACK SPEED SET-UP PROCEDURE

Track drive LEFT TRACK ADJUSTMENT

The following procedure describes how to set up drive motors so that they shift correctly with respect to the pedal pilot pressure and also make adjustments to the drive pumps to set and synchronize the travel speed.

The pilot pressure applied to the motors directly controls the displacement of the closed loop drive motors.

POSITION MACHINE: 4. Position felling head in vertical position and swing boom to LEFT side of machine.

5. Place felling head on ground and by forcing down with boom controls, lift track clear of ground. (Hoist down and stick out)

The motor displacement will change proportionally from maximum displacement (135cc) to minimum displacement (74cc) as the pilot pressure from the foot pedals is increased from 116 psi to 174 psi. The motor maximum displacement setting provides the slowest travel speed with increased torque. The minimum motor displacement setting provides the fastest travel speed but with reduced driving torque.

ANGLE TO BE BETWEEN 90° & 110°

845-12

Each pump maximum displacement setting controls the maximum amount of oil flow to the drive motors for forward and reverse travel.

It Is important that the reactions of the left and right motors are identical otherwise the machine may not drive straight when accelerating in high range. (Drive switch in DRIVE position)

6. Use blocks to firmly support track frame in raised position. DO NOT place arms, legs or body under track while in the raised position.

SET TRACK SPEED Low speed 16 rpm**. High speed 30 rpm. **NOTE: This value is dependant on engine HIGH IDLE speed or FULL throttle. 16 rpm is based on 2250 - 2300 rpm.

The following adjustments are all necessary to correctly set the DRIVE SPEED for a complete system: 1.

2.

3.

4.

MOTOR MAX. DISPL., .......................

PUMP MAX. DISPL.,(FOR TRAV) ......

MOTOR MIN. DISPL., ........................

MOTOR PILOT STROKING ADJ., .....

LIFTING LEFT TRACK

2 - MOTORS 2 - PUMPS 2 - MOTORS 2 - MOTORS

Park machine on flat solid ground and place felling head securely on the ground before performing any service work.

1. Start engine.

2. Raise hydraulic oil temperature to no higher than 100°F or 40°C. NOTE: Do not heat to operating temperature prior to starting this procedure, significant heating will occur during this test. Constantly monitor hydraulic oil temperature during this test procedure.

3. Remove both LEFT and RIGHT drive motor inspection covers.

11.16

Tigercat 870B Feller Buncher

Track drive

(1) SET MOTOR MAX. DISPL. (LOW SPEED)

RIGHT TRACK ADJUSTMENT

NOTE: The MOTOR maximum displacement setting is to set the LOW speed setting:

15. Re-position machine to raise RIGHT track.

MAXIMUM DISPLACEMENT = 135cc/rev.

7. On left track drive motor, unscrew the maximum displacement adjusting screw all the way OUT.

ANGLE TO BE BETWEEN 90° & 110°

•

845-12

LIFTING RIGHT TRACK

16. Repeat steps 6 through 14 to set RIGHT drive motor.

MAXIMUM DISPLACEMENT ADJUSTING SCREW

17. RIGHT drive motor maximum displacement (slow track speed) is now set to 135cc per revolution.

6mm ALLEN KEY 19mm WRENCH

• MINIMUM DISPLACEMENT ADJUSTING SCREW 6mm ALLEN KEY 19mm WRENCH 870B-D12

LEFT TRACK DRIVE MOTOR

8. Set throttle switch to FULL

..

9. From operator's seat, lower left armrest and press PILOT RESET switch to activate pilot system.

10. Place ANTI-STALL switch to OFF position.

11. Place DRIVE/LOW switch to LOW. 12. With an assistant depressing LEFT (FREE) TRACK drive pedal FORWARD, turn maximum displacement screw IN until the end of adjusting screw just makes contact with piston inside the motor.

13. Release drive pedal and turn screw IN an additional 1/4 turn. Tighten locknut while holding adjusting screw from turning.

14. LEFT drive motor maximum displacement (slow track speed) is now set to 135cc per revolution.

11.17

Tigercat 870B Feller Buncher

Track drive

(2) SET PUMP MAXIMUM DISPLACEMENT - (PUMP FLOW) LOW SPEED

TRACK TIMING CHART GEARBOX RPM

NOTE: The PUMP maximum displacement setting is to set the LOW speed setting in conjunction with the previous MOTOR maximum displacement setting: Set low FORWARD track speed 18. Assuming that the engine is still running and that the RIGHT track is off the ground;

DESIRED LOW

19. Place ANTI-STALL switch to OFF position.

20. Place DRIVE/LOW switch to LOW. 21. Set engine to FULL throttle

.

22. With an assistant depressing ‘RIGHT’ track drive pedal ‘FORWARD’, record track drive sprocket speed.

Track containing 47 links*: A reading of approximately 16 RPM** is desired which equals one complete revolution of the track every 15.33 seconds.

DESIRED HIGH

23. Re-position machine to raise LEFT track.

DO NOT EXCEED

24. Repeat steps 19 to 22 for the LEFT/ FORWARD track drive, record track drive sprocket speed.

25. NOTE: If the track speeds vary from left to right, a judgement must be made as to which track to adjust at the pump. It is preferable to adjust the faster track to the speed of the slower track.

The actual speed is not critical, but what is important is that the left and right speeds are the same.

26. To obtain the 16 RPM** value loosen locknut on FORWARD maximum displacement adjusting screw on drive pump for the track side being adjusted. Turn the screw either IN (clockwise) to slow down or OUT (counterclockwise) to speed up the final drive.

FORWARD MAXIMUM DISPLACEMENT ADJUSTING SCREW

26MM MAX. (TYPICAL)

PILOT PORT 'Y' AP097.AI

24.52 22.29 20.43 18.86 17.52 16.35 15.33 14.42 13.62 12.91 12.26 11.68 11.15 10.66 10.22 9.81 9.43 9.08 8.76 8.46 8.17 7.91 7.66 7.43 7.21 7.01 6.81 6.63 6.45 6.29 6.13

26.61 24.19 22.17 20.47 19.01 17.74 16.63 15.65 14.78 14.00 13.30 12.67 12.09 11.57 11.09 10.64 10.23 9.86 9.50 9.18 8.87 8.58 8.32 8.06 7.83 7.60 7.39 7.19 7.00 6.82 6.65

Set low REVERSE track speed 27. Follow steps 19 through 26 to set LEFT and RIGHT LOW track speed using REVERSE foot pedal and REVERSE adjusting screw.

•

•

23.48 21.34 19.57 18.06 16.77 15.65 14.67 13.81 13.04 12.36 11.74 11.18 10.67 10.21 9.78 9.39 9.03 8.70 8.39 8.10 7.83 7.57 7.34 7.11 6.91 6.71 6.52 6.35 6.18 6.02 5.87

Tighten locknut on adjusting screw and recheck sprocket speed.

REVERSE MAXIMUM DISPLACEMENT ADJUSTING SCREW

•

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

NUMBER OF TRACK LINKS 45 47 51 TRACK REVOLUTION TIME (SECONDS)

• PILOT PORT 'Z'

DRIVE PUMP MAXIMUM DISPLACEMENT ADJUSTMENT

11.18

Tigercat 870B Feller Buncher

Track drive

(3) SET MOTOR MINIMUM DISPLACEMENT (HIGH SPEED)

MINIMUM DISPLACEMENT ADJUSTING SCREW

NOTE: The motor minimum displacement setting is to set the HIGH speed setting:

6mm ALLEN KEY 19mm WRENCH

MINIMUM DISPLACEMENT = approx. 74cc/rev.

MAXIMUM DISPLACEMENT ADJUSTING SCREW

NOTE: Turn the screw either IN (clockwise) to SLOW DOWN or OUT (counterclockwise) to SPEED UP the drive motor.

••

6mm ALLEN KEY 19mm WRENCH

28. Assuming that the engine is still running and that the RIGHT track off the ground; 29. Place ANTI-STALL switch to OFF position.

•

30. Place DRIVE/LOW switch to DRIVE. 31. Set throttle switch to FULL

..

32. With an assistant depressing RIGHT TRACK drive pedal ‘FORWARD’, record track drive sprocket speed.

A TIMING MARK, VISIBLE FROM THE CAB CAN ALSO BE PLACED ON THE TRACK

870B-D12

RIGHT TRACK DRIVE MOTOR

33. To obtain the 30 RPM adjust the minimum displacement adjusting screw for the RIGHT track drive motor. Turn the screw either IN (clockwise) to slow down or OUT (counterclockwise) to speed up the final drive.

Tighten locknut on adjusting screw and recheck sprocket speed.

IMPORTANT: DO NOT exceed the recommended track speed specified above, over speeding will damage the drive motor.

ROTATION

*NOTE: Refer to TRACK TIMING CHART TO RECORD TRACK SPEED, PLACE TIMING MARKS ON TRACK FRAME AND GEARBOX HOUSING 84-18

SET TRACK SPEED

Track containing 47 links* : A reading of 30 RPM is desired which equals one complete revolution of the track every 8.17 seconds.

34. Drive motor minimum displacement (high track speed) is now set to 74cc per revolution.

LEFT TRACK ADJUSTMENT 35. Repeat steps 29 to 34 to set the LEFT track drive motor with LEFT track off the ground.

36. To complete the TRACK SPEED SETUP PROCEDURE continue with (4) MOTOR PILOT STROKING ADJUSTMENT:-

11.19

Tigercat 870B Feller Buncher

Track drive

(4) MOTOR PILOT STROKING ADJUSTMENT

BASE MANIFOLD

Before making the MOTOR PILOT STROKING ADJUSTMENTS it is important that the MOTOR POR and the previous three procedures have been performed:-

•

& Set MOTOR POR relief valve 1. Set MOTOR MAXIMUM DISPLACEMENT on BOTH motors. (Low speed) 2. Set PUMP MAXIMUM DISPLACEMENT on BOTH pumps. (Low speed)

••

3. Set MOTOR MINIMUM DISPLACEMENT on BOTH motors. (High speed)

GAUGE TEST PORT DC2

1. Assuming that the engine is still running and that the LEFT track is off the ground;

• •• • 870B-D07

845-12

Set pilot pressure to motor 2. Raise hydraulic oil temperature to no higher than 100°F or 40°C. NOTE: Do not heat to operating temperature prior to starting this procedure, significant heating will occur during this test. Constantly monitor hydraulic oil temperature during this test procedure.

3. Disconnect LEFT brake line to track drive gearboxes. Plug hose with size 06 JIC plug and cap port adapter on hose to gearbox but do not completely seal.

4. Install a 0-500 psi pressure gauge on gauge test port DC2 on motor POR valve.

5. From the operator's seat, lower left armrest and press the PILOT RESET switch to activate pilot system.

6. Place ANTI-STALL switch to OFF position.

7. Turn ‘DRIVE/LOW’ switch to ‘DRIVE’

DRIVE MOTOR REMOTE POR. VALVE

WARNING

LIFTING LEFT TRACK

8. Set engine to FULL throttle

ADJUSTING SCREW

MOTOR POR. VALVE

ANGLE TO BE BETWEEN 90° & 110°

SANDWICH MANIFOLD WITH "PHANTOM" RELIEF VALVE

DO NOT stand on tracks when performing these tests.

WARNING Ensure that test area around the machine is clear of personnel.

CAUTION DO NOT hold pedal down for too long for track on the ground with brake ON. While the foot pedal is pressed, oil will flow over the pump crossline relief valves causing the drive circuit to heat up.

10. With an assistant depressing RIGHT (BLOCKED) track drive pedal fully REVERSE and LEFT (FREE) track pedal fully 'FORWARD' check gauge reading and if necessary re-adjust phantom relief valve until gauge on DC test port reads 160 psi.

NOTE: Constant monitoring of the motor pilot pressure (DC port) is essential. Since a small change in the pressure results in a large change in motor speeds.

.

9. With an assistant depressing LEFT track drive pedal fully ‘REVERSE’, adjust phantom relief valve until gauge on DC test port reads 160 psi.

11.20

Tigercat 870B Feller Buncher

Track drive

11. Install a 0-500 psi pressure gauge with a long extension hose onto the DC gauge test port so that gauge will be visible at drive motors OR Tee a 0-500 psi pressure gauge into the pilot pressure port at the drive motor.

Set RIGHT motor pilot stroking adjustment 15. With an assistant depressing (BLOCKED) LEFT/REVERSE track drive pedal fully and (FREE) RIGHT/FORWARD track pedal fully, measure RIGHT track speed.

Set LEFT motor pilot stroking adjustment 12. With an assistant depressing (BLOCKED) RIGHT/REVERSE track drive pedal fully and (FREE) LEFT/FORWARD track pedal fully, measure LEFT track speed.

16. Adjust RIGHT motor pilot stroking adjustment until the motor speed is 24.7 rpm. plus/minus 0.4 rpm. with 2250 rpm engine speed. Turn adjusting screw Clockwise to increase speed and Counterclockwise to decrease speed.

PORT 'X' PILOT PRESSURE FROM POR VALVE

NOTE: Motor pilot pressure was checked and set (160 psi) when the LEFT track setup procedure was performed earlier and should not need to be further adjusted when doing the RIGHT track setup. HOWEVER constant monitoring of the motor pilot pressure (DC port) is essential. Since a small change in the pressure results in a large change in motor speeds.

•• ••

•• •

DISCONNECT BRAKE LINE AT PORT ON TRACK DRIVE GEARBOX. 391-07

••

ALTERNATIVE LOCATION FOR 0-500 PSI PRESSURE GAUGE. "TEE" INTO THIS LINE MOTOR PILOT STROKING ADJUSTING SCREW

LEFT TRACK DRIVE MOTOR

13. Adjust LEFT motor pilot stroking adjustment until the motor speed is 24.7 rpm. plus/minus 0.4 rpm. with 2250 rpm engine speed. Turn adjusting screw Clockwise to increase speed and Counterclockwise to decrease speed.

14. Re-position machine to raise RIGHT track.

17. Loosen locknut on PHANTOM relief valve adjusting screw and turn adjusting screw in until lightly seated, Screw out 1/8 turn.

Tighten locknut. This adjustment position will prevent the phantom relief valve from operating during normal operation.

18. At this point all TRACK SPEED ADJUSTMENTS will have been completed.

19. Lower machine back onto the ground and position felling head firmly on the ground.

20. Stop engine.

21. Re-connect brake line(s) to gearboxes.

22. Remove pressure gauges and wipe up any spills.

23. Replace both LEFT and RIGHT drive motor inspection covers.

ANGLE TO BE BETWEEN 90° & 110°

845-12

LIFTING RIGHT TRACK

19. Re-connect LEFT brake line.

20. Disconnect RIGHT brake line to track drive gearboxes. Plug hose with size 06 JIC plug and cap port adapter on hose to gearbox but do not completely seal.

11.21

Tigercat 870B Feller Buncher

Track drive

SUMMARY: TRACK SPEED SET-UP PROCEDURE

SET MOTOR MIN. DISP. (HIGH SPEED)

SET MOTOR MAX. DISP. (LOW SPEED) 1. Start engine 2. Set hydraulic oil temperature 100°F or 40°C 3. Remove both motor inspection covers LEFT TRACK ADJUSTMENT 4. Position machine with LEFT track off ground Set motor maximum displacement 5. Screw LEFT motor max. displ. screw OUT 6. Place ANTI-STALL switch OFF 7. Place TRACK (LOW/DRIVE) switch to LOW 8. Set engine to FULL throttle 9. Set LEFT motor max. displacement screw 10. Re-position machine with RIGHT track off ground 11. Perform RIGHT track adjustment

24.

25.

26.

27.

RIGHT track off ground

Place ANTI-STALL switch OFF Place TRACK (LOW/DRIVE) switch to DRIVE Set engine to FULL throttle Record RIGHT/FORWARD drive sprocket speed.

28. Set RIGHT motor min. displacement screw LEFT TRACK ADJUSTMENT 29. Re-position machine with LEFT track off ground 30. Repeat steps 24 - 28 for LEFT track

SET PUMP MAX. DISP. (LOW SPEED) Set low FORWARD track speed RIGHT track off ground

12. Place ANTI-STALL switch OFF 13. Place TRACK (LOW/DRIVE) switch to LOW 14. Set engine to FULL throttle

15. Record speed of RIGHT/FORWARD drive sprocket 16. Re-position machine with LEFT track off ground 17. Repeat steps 12 - 15 for LEFT/FORWARD drive sprocket speed Adjust faster track to speed of slower track 18. Set FORWARD maximum displacement adjusting screw on "faster" drive pump Set low REVERSE track speed 19. LEFT track off ground 20 Record speed of LEFT/REVERSE drive sprocket

21. Re-position machine with RIGHT track off ground 22 Record speed of RIGHT/REVERSE drive sprocket Adjust faster track to speed of slower track 23. Set REVERSE maximum displacement adjusting screw on "faster" drive pump

11.22

Tigercat 870B Feller Buncher MOTOR PILOT STROKING ADJUSTMENT 1. Complete previous adjustments before continuing: Set pilot pressure to motor LEFT track off ground 2. Set hydraulic oil temperature 100°F or 40°C 3. Disconnect LEFT brake line 4. Install a 0-500 psi gauge on test port DC2 5. Activate pilot system 6. Place ANTI-STALL switch OFF 7. Place TRACK (LOW/DRIVE) switch to DRIVE 8. Set engine to FULL throttle 9. Press LEFT/REVERSE drive pedal and adjust PHANTOM relief valve 10. Press RIGHT/REVERSE (BLOCKED) drive pedal and LEFT/FORWARD (FREE) pedal and if necessary re-adjust PHANTOM relief valve

Track drive 11. Install a 0-500 psi gauge with extension on DC2 test port OR Tee a 0-500 psi gauge at drive motor.

Set left motor pilot stroking adjustment 12. Press RIGHT/REVERSE (BLOCKED) drive pedal and LEFT/FORWARD (FREE) pedal and measure LEFT track speed 13. Set LEFT motor pilot stroking adjustment 14. Re-position machine with RIGHT track off ground 15. Re-connect LEFT brake line 16. Disconnect RIGHT brake line Set right motor pilot stroking adjustment 17. Press LEFT/REVERSE (BLOCKED) drive pedal and RIGHT/FORWARD (FREE) pedal and measure RIGHT track speed 18. Set RIGHT motor pilot stroking adjustment 19. Re-set PHANTOM relief (screw fully IN and back out 1/8 turn 20 Lower machine onto the ground 21. Stop engine 22. Re-connect brake line(s) 23. Remove pressure gauges 24. Replace both drive motor inspection covers

11.23

Tigercat 870B Feller Buncher TRACK COMPONENTS

Track drive

IMPORTANT: New machine: Before driving a new machine ensure that track sag is set correctly. Track sag may be set less than specified for shipping purposes.

The correct track sag must be adjusted once a machine has been delivered to the job sight and operating in the accumulated soil build-up in the undercarriage.

TRACK SAG NOTE: The track sag dimension is very important and should be checked regularly, 50% increase in the life of the track assembly can be realized, particularly bushing O/D wear and track pitch by maintaining the correct amount of track sag. A track that is too tight will wear out significantly faster due to increased tension in the chain.

Track components operate under varying terrain conditions, most of which cause excessive wear.

Wear to one component can quickly spread to the rest of the track assembly.

To ensure that the track components are always in good running order, a periodic inspection should be made to ensure that components have not come loose, that bolts are at the correct torque, that components are within the specified wear limits (discussed further in this section) and where applicable, check lubrication points.

ANGLE TO BE BETWEEN 90° & 110°

845-12

MEASURING TRACK SAG 1. Position felling head in vertical position and swing boom to side of machine.

2. Place felling head on ground and by forcing down with boom controls, lift track clear of ground.

3. Rotate track in forward and reverse several times. Stop the track while in reverse. Do not clean the track.

4. Stop engine.

5. Measure distance between top surface of track shoe at centre of lower surface of track frame.

For a guide on inspection, refer to the PERIODIC MAINTENANCE SCHEDULE in SECTION 3 OF THIS MANUAL.

UNDERSIDE OF TRACK GUARD

SAG DIMENSION

• •

UPPER SURFACE OF TRACK SHOE 853ILL8

MEASURING SAG DIMENSION

6. This dimension should be between 4" and 6" for normal operations.

845-13

OPERATE MACHINE WITH FELLING HEAD OVER IDLERS

OPERATING THE MACHINE

NOTE: If track sag is less than specified, track chain wear will be accelerated. If track sag is excessive, it is possible for the track to jump off the sprocket.

Whenever possible the machine should always be operated with the felling head over the IDLERS and not over the SPROCKETS. Operating over the sprockets will result in overloading of the contact surfaces between the sprocket and the track bushings. Bushings could crack during sprocket impact.

11.24

Tigercat 870B Feller Buncher IDLER ADJUSTING 4 CYLINDER

Track drive TORQUING UNDERCARRIAGE BOLTS

•

It is important to check the torque values of the track shoe retaining bolts and the bottom roller retaining bolts at the NEW MACHINE MAINTENANCE time period (first 100 hours) and the EVERY 125 HOURS SCHEDULED MAINTENANCE time period.

3

•

DO NOT REMOVE

•

•

CW001-3

• 1

2

When installing new components, all traces of paint and dirt must be removed from all mating surfaces including the contact area under the bolt head and nut.

TRACK ADJUSTMENT TRACK SAG ADJUSTMENT

Both the bolt and the nut on the track shoes should be lightly lubricated with SAE 30 oil and tightened using the Torque-turn method.

To tighten track, attach adjustment fitting adapter (3) onto valve body (1). Connect a grease gun to the grease fitting (2) on the adjustment fitting adapter (3). Add grease until track sag dimension is within recommended limits. Remove adjustment fitting adapter.

The torque-turn method involves torquing the bolt to an initial predetermined value, plus an additional 1/3 turn (not the value shown in the torque charts). This ensures a more accurate and consistent torquing of the bolts, with less likelihood of the bolt/nut coming loose later.

CAUTION: The grease is under very high pressure, DO NOT REMOVE the adjustment fitting valve body (1) from the idler adjusting cylinder (4).

When checking the torque values at the first 100 hours and every 125 hours thereafter use the CHECKING TORQUE values listed in the following paragraphs.

To loosen track, slowly loosen valve body (1) until grease begins to escape via a relief passage in the valve body housing, grease will be seen escaping from around valve body threads. When track sag is correct, tighten valve body.

If loose shoes or under torqued bolts are discovered during the FIRST 100 HOUR check, they should be removed, surfaces cleaned, and reused using the torque-turn method. If the shoe is not loose but a single bolt is low on torque, loosen the bolt and re torque-turn.

CW001-2

If loose or under torqued bolts are discovered any time after the 100 HOUR check, the bolts and nuts must be replaced with NEW ones, surfaces cleaned, and re torque-turned.

TRACK SHOE RETAINING BOLTS Track shoes must be fastened together applying the exact torque values shown below and using the Torque-turn method described in TORQUING UNDER CARRIAGE BOLTS earlier in this section.

TORQUE 1

TRACK COMPONENT TORQUE VALUES 11.25

Tigercat 870B Feller Buncher

Track drive

Track shoe bolts and nuts are designed specifically for this purpose and should not be substituted with standard off the shelf hardware.

Only bolts with grade '12.9' or '170' designation forged in the head are approved.

SINGLE GROUSER BERC-9

When checking the torque values at the first 100 hours and every 125 hours thereafter use the checking torque value.

DOUBLE GROUSER BERC-10

Track shoe bolts ~ 3/4" UNC (D6) TORQUE-TURN .............. 250LBF-FT. + 1/3 TURN. CHECKING TORQUE ........................ 450 LBF-FT.

TRIPLE GROUSER

Track shoe bolts ~ M24 (FH400) BERC-1

TORQUE-TURN .............. 340LBF-FT. + 1/3 TURN.

GROUSER WEAR (HEIGHT)

CHECKING TORQUE ...................... 1040 LBF-FT.

WEAR LIMITS

BOTTOM ROLLER RETAINING BOLTS

TRACK SHOE GROUSER HEIGHT WEAR WEAR LIMITS New 75% wear 100% wear Single 2.82" (716.2mm) .... 1.37" (348mm) ......... 0.93" (236.2mm) Double 1.37"(348mm) ...... 0.71"(180.3mm)..... 0.43" (109.2mm) Triple 1.06" (269.2mm) .... 0.51" (129.5mm) ...... 0.36" (91.4mm)

The bottom rollers must be fastened to the lower frame applying the exact torque values shown below.

When installing new rollers, apply "NEVER-SEEZ" to the bolt.

When checking the torque values at the first 100 hours and every 125 hours thereafter use the torque value(s) shown below.

NOTE: Allowable wear for soft ground conditions is 100%. Allowable wear for rocky ground conditions is 75%.

NOTE: Two sizes of bolts have been used to fasten the rollers to the lower frame; 3/4" UNC; and on later machines 7/8" UNC. Bottom roller bolts ~ 3/4" UNC TORQUE ........................................... 310 LBF-FT. Bottom roller bolts ~ 7/8" UNC TORQUE ........................................... 475 LBF-FT. BERC-2

For a complete maintenance check Refer to the PREVENTIVE MAINTENANCE SCHEDULE in SECTION 3 of this manual.

TRACK LINK WEAR (HEIGHT)

TRACK LINK WEAR WEAR LIMITS New link height ......................... 4.78" 50% wear ................................. 4.60" 75% wear ................................. 4.48" 100% wear ............................... 4.34"

11.26

(121.5mm) (116.8mm) (113.8mm) (110.2mm)

Tigercat 870B Feller Buncher

Track drive

PIN AND BUSHING WEAR

BUSHING WEAR, OUTSIDE DIAMETER

To obtain the track internal wear, i.e., the wear between the pin and the internal diameter of the bushing, measure the track pitch over four sections of track (5 pins).

Use a calliper to measure the wear of the bushing O.D. in three places.

45°

45°

FORWARD SIDE VERTICAL WEAR WEAR BERC-3

MEASURING TRACK PITCH

To take this measurement, 1. Remove slack by placing a steel pin between sprocket and chain, then slowly move machine in reverse to tighten chain.

2. Measure pitch across two four link sections, except section on each side of the master pin, to find average chain wear.

INTERNAL PIN & BUSHING WEAR

ROTATION

MEASURING BUSHING WEAR

BERC-5

NOTE: Bushing outside diameter is measured at three places because of the forward and reverse travel of the machine and a vertical wear that takes place.

WEAR LIMITS New bushing O.D. ........................ 2.62" (66.6mm) 75% worn ..................................... 2.5" (63.5mm) 100% worn ................................... 2.43" (61.7mm) NOTE: Allowable wear in rocky ground is 75% BOTTOM ROLLER WEAR

180° EXTERNAL BUSHING WEAR

REVERSE SIDE WEAR

TURN PIN & BUSHING 180°

Measure the roller diameter on the tread contact surface with a large calliper to obtain the worst wear condition.

BERC-4 PIN/BUSHING INTERNAL WEAR NOTE: Wear to the pins and bushings only occurs in a small localised area, to extend the life of these components, the pins and bushings may be turned 180° or replaced provided other components are within specified wear limits:

1. Track link wear is 75% or less.

2. Change in track pitch is 32.50:" (825.5mm) per link or less.

3. Bushing external wear less than 100% or 75% or less in rocky ground.

BERC-6

MEASURING BTM. ROLLER WEAR

4. There is at least 0.008" (0.2mm) press fit available between pin and bushing and link.

If accessibility to the rollers is impaired by guards, then concentrate on the front and rear rollers, these will be the most worn.

WEAR LIMITS New length of four sections .............. 32" (813.0mm) 75% worn ......................................... 32.37"(822.2mm) 100% worn ....................................... 32.50"(825.5mm)

WEAR LIMITS New roller. ................................... 8.26" (210.0mm) 75% worn .................................... 7.64" (194.0mm) 100% worn .................................. 7.36" (187.0mm)

NOTE: Allowable wear in rocky ground is 75% NOTE: These wear limits are to be used as a guide for when to turn the pins and bushings. If pins and bushings are not to be turned, the chain can be run past the 100% wear limit, until chain failure.

11.27

Tigercat 870B Feller Buncher IDLER WEAR Measure the idler wheel side diameters (tread contact surface) at several points to obtain the worst wear condition. Position a depth gauge or measuring tape as close as possible toward the centre of the idler with the gauge flat on the centre flange and parallel to the idler shaft.

Track drive Since the checking area is not immediately visible, the measuring may be done using a "go/no go" gauge made from a piece of 1/8" flat bar. The gauge is inserted down through the holes in the track and placed between the track guide and the track bushing. Make sure that dirt build-up does not interfere with the reading. Check at several locations. The ends of the track slides tend to wear first. The slides should be replaced if excessive wear is found.

'A'

BERC-7

'A'

MEASURING IDLER WEAR

WEAR LIMITS New idler dimension ...................... 0.85"(22.0mm) 100% wear .................................... 1.18"(30.0mm)

TRACK SLIDE WEAR

845-32

TRACK SLIDE WEAR

Track slide wear should be checked periodically to ensure that it does not go over the limit and cause damage to the chain link bushings.

CHAIN LINK

•

•

CHECK THIS DIMENSION

•

CHAIN LINK BUSHING TRACK GUIDE

•

TRACK SLIDE

845-33

SECTION A - A

1/8"

845-33A

SUGGESTED MEASURING GAUGE The wear occurs on the top of the track slide as the chain links slide along and this wear will reduce the clearance between the track guide and the chain link bushings. When this clearance disappears the chain link bushings will start to wear.

11.28

Tigercat 870B Feller Buncher

SECTION 12 - BOOM FUNCTIONS JUNE 2003

CONTENTS - SECTION 12 ADJUST OIL FLOW TO CYLINDERS (CYLINDER CYCLE TIMES ................ 12.8 BOOM CONTROL VALVE ............................................................................ 12.3 BOOM SYSTEM DESCRIPTION 'ER' BOOM SYSTEM ................................................................................ 12.2 STANDARD BOOM ................................................................................... 12.2

SEE ALSO SECTON 4

CIRCUIT DIAGRAM 'ER' BOOM SYSTEM ................................................................................ 12.5 'STANDARD' BOOM SYSTEM .................................................................. 12.4 CYLINDER CYCLE TIMES, TYPICAL ........................................................... 12.9 ENGINE ANTI-STALL .................................................................................... 12.3

SEE ALSO SECTON 4

LOAD SENSING ........................................................................................... 12.3

SEE ALSO SECTION 9

SET MAIN BOOM, STICK AND TILT PORT RELIEF VALVES ...................... 12.6 TILT CYLINDER FLOW ADJUSTMENT ............................................. 12.3, 12.10

Tigercat 870B Feller Buncher BOOM SYSTEM DESCRIPTION

Boom functions

STANDARD BOOM Two cylinders are used to raise and lower the main boom.

The stick boom and the tilt each use identical single cylinders.

These cylinders receive oil from the main pump via three spool sections on the main hydraulic valve.

Two joystick handles in the cab control the movement of each cylinder by directing pilot oil to the pilot end caps on each end of the appropriate spool sections to shift the spool and move the cylinder(s).

'ER' BOOM SYSTEM An additional REACH cylinder is plumbed into the above boom system to allow movement of the boom system to be controlled by the LEFT and RIGHT joystick levers. Simply pushing the LEFT joystick FORWARD moves the boom straight out of pulling back on the loystick moves the head towards the machine. The right joystick moves the boom system UP or DOWN. For additional information regarding SEFETY and OPERATING INSTRUCTIONS, Refer to ER BOOM SYSTEM in SECTION 1 of THIS MANUAL and SECTION 2 in the OPERATOR'S MANUAL.

12.2

Tigercat 870B Feller Buncher MAIN BOOM 'UP' PORT RELIEF

SWING

Boom functions

STICK 'OUT' PORT RELIEF

TANK PORT 'T3'

HIGH PRESSURE TILT 'FORWARD' PORT RELIEF LIMITING CONTROL

FLOW ADJUSTING SCREW FOR PORT 'B' (TYPICAL)

• •

• •

•

•

•

•

A

A

A

A

B

B

B

B

•

•

• MAIN BOOM 'DOWN' PORT RELIEF

STICK 'IN' PORT RELIEF

CONTROL VALVE MANIFOLD

TILT 'BACK' PORT RELIEF

MAIN CONTROL VALVE

870B-41

BOOM CONTROL VALVE The boom, stick and tilt spool sections each have port relief valves with anticavitation features.

These protect the circuit from abnormally high pressures induced by the load.

Adjustable spool travel stops on each pilot end cap of the spool sections can be adjusted to limit spool travel and control the flow of oil to the cylinder, which in turn controls the operating speed of the cylinders.

An additional flow control adjusting screw (restrictor) located on the under side of the main valve manifold is used to regulate the flow of return oil from the rod end of the TILT cylinder.

ADJUSTING SCREW TILT 'BACK' PILOT END CAP

• •• •

UNDERSIDE OF CONTROL VALVE MANIFOLD

••

This adjustment is to compensate for the weight of trees in the felling head causing the head to TILT FORWARD too fast. Tilting forward too fast can cause oil to cavitate in the base end of the tilt cylinder.

For adjusting procedure refer to TILT CYLINDER (ROD END) FLOW ADJUSTMENT in THIS SECTION. To adjust the relief valves, Refer to SET MAIN BOOM, STICK AND TILT PORT RELIEF VALVES in THIS SECTION. To adjust oil flow, Refer to ADJUST OIL FLOW TO CYLINDERS in THIS SECTION. LOAD SENSING\ENGINE ANTI-STALL The boom hydraulics along with the swing and track drive circuits are all under the control of the load sensing system incorporated into the main hydraulic circuit.

For a full description of the main hydraulic system including load sensing, the main pump and the main control valve, Refer to SECTION 4 in THIS MANUAL. For a full description of the engine anti-stall, Refer to SECTION 9 in THIS MANUAL.

870B-D16

FLOW CONTROL ADJUSTING SCREW - TILT

For a full description of the pilot system including the joystick handles, Refer to SECTION 5 in THIS MANUAL. 12.3

Tigercat 870B Feller Buncher

870B-31

Boom functions

'STANDARD' BOOM SYSTEM CIRCUIT DIAGRAM 12.4

Tigercat 870B Feller Buncher

870B-33

Boom functions

'ER' BOOM SYSTEM CIRCUIT DIAGRAM 12.5

Tigercat 870B Feller Buncher WARNING

Boom functions SET MAIN BOOM, STICK AND TILT PORT RELIEF VALVES NOTE: Constant loosening and tightening of the locknut (sealnut) on the port relief valve adjusting screws will eventually cause the seal in the nut to break down and leak.

Because of this it is best to keep the adjusting procedure brief.

'ER' BOOM SYSTEM When setting up a machine equipped with an (ER) boom system, the following points must be noted.

The main and stick boom cylinder circuits are connected hydraulically. Thus, disconnecting a hydraulic line to a boom cylinder may cause either boom to move unexpectedly. The boom may also move unexpectedly if a port relief adjusting screw is unscrewed (counterclockwise) too far and the pressure drops below that which is required to hold the weight of the boom and head. Ensure that the attachment is resting squarely on a solid footing, tank pressure is relieved and engine is shut off before disconnecting any hydraulic lines, See SERVICE POSITION FIG.1.

Also note that because of the hydraulic connection between the main boom and ER cylinders, the ER cylinder can overpower the stick cylinder under certain conditions, causing the stick boom to move unexpectedly. This most often occurs when setting the MAIN BOOM UP relief valve, causing the stick to extend, but it may also happen at other times if the relief settings are not correct. Ensure that all personnel and equipment are clear of the boom path and that there is sufficient overhead clearance for the head to rise before making any adjustments.

STICK CYLINDERS FULLY EXTENDED

1. With hydraulic oil at operating temperature, LINDE MAIN VALVE MANIFOLD

• 'P' GAUGE TEST PORT

• •• L.S. GAUGE TEST PORT

MAIN VALVE MANIFOLD 2. Connect a 0-5000 psi pressure gauge on 'P' test port of Linde main valve manifold.

103-17A

3. Start engine and place throttle control in IDLE position. NOTE; It may be necessary to increase the engine RPM sufficiently to prevent the engine from stalling.

SPOOL TRAVEL STOP • 19mm WRENCH • 6mm ALLEN KEY

•

•

870B-02

PILOT END CAP

•

ADJUSTING SCREW • 5mm ALLEN KEY

TIP OF STICK BOOM FULLY SUPPORTED

L.S. RELIEF VALVE (P2)

••

• •

LOCKNUT • 17mm WRENCH

•

PORT RELIEF VALVE

SERVICE POSITION FIG.1 MAIN VALVE BODY

90744-3

•

MAIN VALVE PORT RELIEF VALVE

4. Lower LEFT armrest and press PILOT RESET switch to activate pilot system.

5. Place ANTI-STALL switch in OFF position.

12.6

Tigercat 870B Feller Buncher

Boom functions NOTE: Observe the pressure gauge at 'P' port when making these adjustments, it will fall and rise as the adjusting screw is being turned and should show 4700 psi as the hissing sound begins to subside or until engine stops lugging.

6. Turn port relief valve adjusting screws for functions being set fully IN (clockwise). Do not overtighten or breakage will result.

7. With the aid of an assistant, bottom out the cylinder of the function being set and adjust L.S. pressure relief valve on Linde main valve manifold to 4700 psi on pressure gauge at 'P' port. Tighten locknut on adjusting screw.

10. Tighten locknut on adjusting screw taking care NOT to turn the adjusting screw at the same time.

11. Check the setting again by ensuring that the hissing noise is still absent after tightening the locknut.

MAIN BOOM PORT RELIEFS: NOTE: When making these relief adjustments, the upper should be positioned with the boom in the straight ahead position between the tracks.

12. With an assistant holding R.H. joystick in MAIN BOOM DOWN position (fully retracted), loosen locknut on the main boom DOWN port relief valve cartridge and slowly unscrew adjusting screw (counterclockwise) until oil can be heard (hissing noise) flowing through the relief valve or engine begins to lug slightly.

WARNING When adjusting the port relief valves, the boom will fall if the relief adjusting screw is unscrewed (counterclockwise) out too far.

13. Slowly raise setting (clockwise) until hissing noise stops or until engine stops lugging.

8. With an assistant holding R.H. joystick in MAIN BOOM UP position (fully extended), loosen locknut on the main boom UP port relief valve cartridge and slowly unscrew adjusting screw (counterclockwise) until oil can be heard (hissing noise) flowing through the relief valve or engine begins to lug slightly.

NOTE: Observe the pressure gauge at 'P' port when making these adjustments, it will fall and rise as the adjusting screw is being turned and should show 4700 psi as the hissing sound begins to subside or until engine stops lugging.

14. Tighten locknut on adjusting screw taking care NOT to turn the adjusting screw at the same time.

9. Slowly raise setting (clockwise) until hissing noise stops or until engine stops lugging.

MAIN BOOM 'UP' PORT RELIEF

STICK 'OUT' PORT RELIEF

HIGH PRESSURE TILT 'FORWARD' PORT RELIEF LIMITING CONTROL

SWING

FLOW ADJUSTING SCREW FOR PORT 'B' (TYPICAL)

•

•• ••

•

•

MAIN BOOM 'DOWN' PORT RELIEF 870B-41

•

•

••

•

STICK 'IN' PORT RELIEF

•• TILT 'BACK' PORT RELIEF

MAIN CONTROL VALVE 12.7

CONTROL VALVE MANIFOLD

Tigercat 870B Feller Buncher

Boom functions

15. Check the setting again by ensuring that the hissing noise is still absent after tightening the locknut.

4. Place ANTI-STALL switch in OFF position.

MAIN BOOM CYLINDER(S); 5. Fully retract cylinder(s).

STICK AND TILT PORT RELIEFS 16. Repeat steps 8 thru' 15 to set the port relief valves for the STICK 'IN' and 'OUT' and the TILT 'FORWARD' and 'BACK' functions.

6. Place MAIN BOOM joystick lever in 'FULL UP' position and fully ** extend cylinders.

Record cycle time from stop to stop.

7. Place MAIN BOOM joystick lever in 'FULL DOWN' position and fully ** retract cylinders.

Record cycle time from stop to stop.

17. Readjust L.S. pressure relief valve on Linde main valve manifold to read 4300 psi on pressure gauge at 'P' port (4000 psi at 'LS' port). Refer to SET LOAD SENSE RELIEF VALVE in SECTION 4 of THIS MANUAL.

STICK BOOM CYLINDER; 8. Repeat steps (5), (6) and (7) using STICK BOOM joystick lever.

18. Stop engine, remove all gauges and reinstall plugs and caps.

TILT CYLINDER; 9. Before the TILT cylinder cycle times can be recorded, the rod end flow control adjusting screw must first be set correctly.

ADJUST OIL FLOW TO CYLINDERS (CYLINDER CYCLE TIMES) NOTE: Constant loosening and tightening of the locknut (sealnut) on the adjusting screws will eventually cause the seal in the nut to break down and leak. Because of this it is best to keep the adjusting procedure brief.

See TILT CYLINDER (ROD END) FLOW ADJUSTMENT in THIS SECTION. Repeat steps (5), (6) and (7) using TILT joystick lever. ** When extending or retracting cylinders to record the time. Stop the cylinder just before it gets to the end of it's stroke rather than let it bottom out and impose unnecessary loads on the cylinder parts and boom structures.

1. Hydraulic oil must be at operating temperature.

2. Start engine and place engine throttle control in FULL position.

3. Lower LEFT armrest and press PILOT RESET switch to activate pilot system.

MAIN BOOM 'UP' PORT RELIEF

STICK 'OUT' PORT RELIEF

SWING

HIGH PRESSURE TILT 'FORWARD' PORT RELIEF LIMITING CONTROL

TANK PORT 'T3'

•• ••

•• •

••

••

MAIN BOOM 'DOWN' PORT RELIEF

••

STICK 'IN' PORT RELIEF

TILT 'BACK' PORT RELIEF

MAIN CONTROL VALVE 12.8

CONTROL VALVE MANIFOLD

•

••

•

•• 870B-41

FLOW ADJUSTING SCREW FOR PORT 'B' (TYPICAL)

Tigercat 870B Feller Buncher

Boom functions

TYPICAL CYLINDER CYCLE TIMES The following chart lists typical cylinder cycle times and is based on recommended factory settings. It should be noted that over adjusting to provide faster cycle times could increase the stress on boom components and the hydraulic system.

CYCLE TIMES - 870B FELLER BUNCHER BOOM FUNCTIONS TIME W/STD TILT TIME W/4-LINK MAIN BOOM UP 5 sec.

5 sec.

MAIN BOOM DOWN 8 sec.

8 sec.

STICK BOOM OUT 4.5 sec.

4.5 sec.

ER ONLY: BOOM OUT N/A N/A STICK BOOM IN 4.5 sec.

4.5 sec.

ER ONLY: BOOM IN N/A N/A TILT FORWARD 3.5 sec.

4 sec.

TILT BACK 3.5 sec.

4 sec.

30° WRIST RIGHT 2.5 sec.

2.5 sec.

30° WRIST LEFT 2.5 sec.

2.5 sec.

340° WRIST RIGHT 12 sec.

12 sec.

340° WRIST LEFT 12 sec.

12 sec.

2 CYL WRIST RIGHT (90° ROTATION) 6 sec.

6 sec.

2 CYL WRIST LEFT (90° ROTATION) 6 sec.

6 sec.

To adjust cycle times; Loosen locknut on spool adjusting screw on main control valve and turn adjusting screw IN (clockwise) to slow down and OUT (counterclockwise) speed up. Tighten locknut on adjusting screw and re-check times.

PORT CONNECTIONS: The 'A' ports (bottom ports) are connected to the base end of the cylinders and the 'B' ports (top ports) are connected to the rod end of the cylinders.

To adjust the flow rate at 'A' PORTS, adjust spool travel stop adjusting screw located at TOP of valve and vice-versa for 'B' ports. See figure 830-D22A.

*

NOTE : The main boom UP on the ER' boom system is not set by a cycle time; The spool stop adjusting screw must be adjusted so that the felling head will rise slightly as the boom system is moving OUT. If set too LOW the felling head will fall to the ground as the boom system is moving OUT or, if set too HIGH the felling will rise too fast.

12.9

ER BOOM 5 sec.

8 sec.

N/A SEE NOTE* N/A SEE NOTE* 4 sec.

4 sec.

2.5 sec.

2.5 sec.

12 sec.

12 sec.

6 sec.

6 sec.

Tigercat 870B Feller Buncher

Boom functions

TILT CYLINDER (ROD END) FLOW AND SPEED ADJUSTMENT

adjustment screw IN. If the TILT speed is too slow, screw the restriction adjustment screw OUT.

This adjusting screw restricts the flow of oil leaving the rod end of the TILT cylinder when tilting FORWARD.

If the pump pressure reading is too low increase flow by screwing TILT spool travel stop adjusting screw (bottom adjuster) OUT. Or if the pressure is too high, decrease the flow by screwing the adjusting screw IN.

UNDERSIDE OF LINDE MAIN VALVE MANIFOLD

•

TILT CYLINDER RESTRICTION ADJUSTMENT SCREW

•• TILT CYL. FLOW ADJUSTING SCREW

120-15A

NOTE: The Tilt restriction and (to a lesser extent) the spool travel stop adjustment both affect the TILT forward speed. Similarly, the TILT restrictor has a small affect on the pump pressure. Alternate between adjustments making moderate changes until the desired speed and pressure ranges are achieved.

When correctly set, this restriction will prevent cylinder damage.

6. Tighten locknut on restriction adjustment screw taking care NOT to turn the adjusting screw at the same time.

1. With hydraulic oil at operating temperature.

7. Check the pressures again after tightening the locknut.

2. Connect a 0-5,000 psi pressure gauge on 'P' test port of Linde main valve manifold.

8. Stop engine and remove gauge.

HIGH PRESSURE LIMITING CONTROL

LINDE MAIN VALVE MANIFOLD

•

••

'P' GAUGE TEST PORT

• • L.S. GAUGE TEST PORT 103-17A

MAIN VALVE MANIFOLD

3. Start engine and place throttle control in FULL. 4. Raise boom and place felling head in fully TILT BACK position (cylinder fully retracted).

5. Loosen locknut on restriction adjustment screw. While holding joystick in the fully TILT FORWARD position, observe pressure gauge and record the TILT travel speed from stop to stop**. Use the restriction adjustment screw to adjust the speed and use the spool travel stop adjustment on the main control valve to maintain 800-1000 psi pump pressure.

If the TILT speed is too fast, screw restriction

12.10

Tigercat 870B Feller Buncher

SECTION 15 - SWING JUNE 2003

CONTENTS - SECTION 15 CIRCUIT DESCRIPTION ................................................................................ 15.2 CIRCUIT DIAGRAM ....................................................................................... 15.6 MAIN CONTROL VALVE SPOOL TRAVEL STOP ............................................................................. 15.5 OIL FLOW TO SWING MOTOR .................................................................... 15.5 PRESSURE SETTINGS ................................................................................ 15.4 SPEED ADJUSTMENT ................................................................................. 15.4 SWING BEARING WEAR LIMITS ................................................................. 15.7

Tigercat 870B Feller Buncher

Swing

SWING DRIVE

FROM BRAKE ORIFICE RELEASE PILOT

SWING DRIVE HYDRAULIC CIRCUIT The swing function is controlled by the left joystick valve which sends proportional pilot signals to the main valve which supplies oil to the dual swing motors.

SWING BRAKE GEARBOX FLUSHING OIL SUPPLY FROM WRIST/ CLAMPS VALVE 'PB' PORT

•

For a description of joystick control valves, refer to SECTION 5 of THIS MANUAL. For a detailed description of the Linde main valve, refer to SECTION 4 of THIS MANUAL. Each of the two swing motors is a piston motor with crossline relief valves mounted on the input end. The crossline relief valves provide a cushion to the high forces that occur during start and stop of the boom swing. Note that in this application the crossline relief valves on the left hand swing drive motor act as reliefs for both the right and left hand swing drive motors. The crossline reliefs on the right hand swing drive motor are NOT used in this application and should be screwed FULLY IN for proper operation.

•

• CROSS LINE RELIEF VALVES

PRESSURE LINES FROM MAIN CONTROL VALVE 845-16

SWING DRIVE MOTOR SCHEMATIC CROSSLINE RELIEF VALVES • USED AS RELIEF FOR BOTH RIGHT AND LEFT HAND SWING DRIVES

CROSSLINE RELIEF VALVES •NOT USED IN THIS APPLICATION (SCREWED FULLY IN)

L.H. ROTATION

R.H. ROTATION SWING MOTORS

• ••

•

••

•• ••

••

MOTOR ADAPTERS

• •

SWING BRAKES

•• •

GEARBOX

GEARBOX

•• • 870B-D14A

LEFT HAND SWING DRIVE

RIGHT HAND SWING DRIVE

DUAL SWING DRIVE GEARBOXES 15.2

SOME HOSES REMOVED FOR CLARITY

•

Tigercat 870B Feller Buncher

Swing

For each of the swing drives, power is transmitted from the motor to a double reduction planetary gearbox which has a spring-applied, hydraulicrelease, multi-disc brake on the input shaft. This brake is normally ON. It is held in the OFF position by hydraulic pressure supplied by the swing brake solenoid valve when the switch in the console is in the OFF position. In the event that electric power is lost to the solenoid valve or hydraulic pressure to the pilot valve is lost, the swing brake will engage (ON) automatically.

The swing gearbox lower bearings are lubricated by grease in a "sealed for life" compartment. The upper gearing is lubricated by hydraulic oil which flows from one of two return ports on the clamps and wrist valve into the 'U' port on the gearbox. A 1/16 inch orifice installed in the 'U' port regulates the flow through the gearbox to approximately 1 gpm. Oil is returned to tank via flushing port 'T'.

The clamps and wrist valve has one other tank port that returns the bulk of the oil in the clamps circuit back to tank.

A check valve installed at the tank connection of this return lines creates a 50 psi back pressure.

This back pressure regulates the 1gpm of hydraulic oil flow through the gearbox to ensure a constant oil level and cooling action.

15.3

Tigercat 870B Feller Buncher PRESSURE SETTINGS AND SWING SPEED ADJUSTMENT

Swing CROSSLINE RELIEF VALVES • USED AS RELIEF FOR BOTH RIGHT AND LEFT HAND SWING DRIVES

SET CROSSLINE RELIEF VALVES NOTE: Ensure that hydraulic oil is at operating temperature.

1. With hydraulic oil at operating temperature, install a 0-5000 psi pressure gauge in the L.S. test port on the back of the main valve manifold.

R.H. ROTATION

• •• •

MAIN VALVE MANIFOLD

'P' GAUGE TEST PORT

•• •• •• 'LS' GAUGE TEST PORT 103-17A

MAIN VALVE MANIFOLD

2. Start engine and place throttle control in FULL. 3. Turn anti-stall switch OFF and the swing brake ON. 4. Ensure that the crossline relief valves on the right hand swing drive motor are screwed FULLY IN. These reliefs are NOT used in this application and must be screwed FULLY IN for proper operation.

870B-D14

L.H. ROTATION

• •• •• ADJUSTING SCREWS

CROSS LINE RELIEF VALVES (LEFT HAND SWING DRIVE)

5. Adjust the crossline relief valves on the left hand swing drive motor. While operating the L.H. joystick lever fully in both the LEFT and RIGHT directions, loosen locknut on each crossline relief adjusting screw and turn adjusting screw until the reading on pressure gauge in L.S. test port reads 3600 psi. for each direction. These reliefs provide crossline relief to both the right and left hand swing drive motors.

6. Retighten locknut on each adjusting screw taking care not to disturb adjusting screw and recheck pressure setting before removing pressure gauge.

7. Stop engine, remove gauge and reinstall plug.

15.4

Tigercat 870B Feller Buncher

Swing

ADJUST OIL FLOW TO SWING MOTOR (SWING MOTOR SPEED ADJUSTMENT)

SPOOL TRAVEL STOP ADJUSTING SCREW • 19MM WRENCH • 6MM ALLEN KEY

NOTE: Constant loosening and tightening of the locknut (sealnut) on the adjusting screws will eventually cause the seal in the nut to break down and leak. Because of this it is best to keep the adjusting procedure brief.

• •

ANTI-CAVITATION VALVE

1. Hydraulic oil must be at operating temperature.

PILOT END CAP

• MAIN VALVE BODY

2. Start engine and set throttle to FULL. 3. Raise felling head off ground and place left joystick lever in 'FULL LEFT' position. Rotate the upper. Record time for one complete revolution.

4. Repeat step (3) with left joystick lever in 'FULL RIGHT' position.

90919-1

The recommended factory setting is between 6 and 7 RPM. It should be noted that over adjusting to provide a faster swing speed increases the stress on boom components and increases the heat load in the hydraulic system.

SWING FLOW ADJUSTING SCREW FOR SWING LEFT

MAIN VALVE SPOOL TRAVEL STOP

5. To adjust swing speed; Loosen locknut on spool travel stop adjusting screw and turn adjusting screw IN (clockwise) to slow down and OUT (counterclockwise) to speed up swing speed. Tighten locknut on adjusting screw and re-check times in both directions of swing.

MAIN BOOM STICK HIGH CYLINDERS CYLINDER PRESSURE LIMITING CONTROL

TILT CYLINDER CONTROL VALVE MANIFOLD

• •• ••

•• •

••

••

A

B

FLOW ADJUSTING SCREW FOR SWING RIGHT 870B-41

•• MAIN CONTROL VALVE

15.5

Tigercat 870B Feller Buncher

870B-32

Swing

SWING HYDRAULIC CIRCUIT 15.6

Tigercat 870B Feller Buncher SWING BEARING WEAR LIMITS It is important that the swing bearing be periodically inspected for wear. Any significant wear will be noticeable by observing too much "tilting" of the upper frame relative to the lower frame. A small amount of designed-in clearance in the bearing is necessary and is present in a new machine.

Too much clearance will affect the backlash between the ring gear and the drive pinion and if left unchecked will cause damage to the gear teeth and ultimately the swing drive gearbox.

The main cause of wear in the ball race can be due to a lack of lubricant or not following the proper lubricating procedure. A damaged or missing peripheral seal will also contribute to early wear by allowing dirt particles to enter the ball race.

Swing The following procedure will verify the amount of wear in the ball race: 1. Position machine with boom fully extended as in position 1.

2. Set indicator to zero.

3. Lower boom as in position 2.

4. Note tilt reading on indicator.

5. Return machine to position 1.

6. Check to see if reading on indicator has returned to zero, if not repeat steps 1 thru 4.

7. Rotate upper frame 90 deg. and repeat steps 1 thru 6.

8. The bearing is considered to be worn when the total play is 0.105" or greater.

Regular inspection of the seal should be carried out and the proper lubricating procedure should be followed. Refer to FILTER AND LUBRICATION SCHEDULE in SECTION 3 of THIS MANUAL.

••

15.7

NOTE: MAGNETIC BASE OF DIAL INDICATOR MUST BE MOUNTED TO BEARING MOUNTING FLANGE AS SHOWN AND NOT TO UNDERCARRIAGE CROSS FRAME.

Tigercat 870B Feller Buncher

Swing

15.8

Tigercat 870B Feller Buncher SECTION 17 - SAW DRIVE MARCH 2003

CONTENTS - SECTION 17 CIRCUIT DESCRIPTION ............................................................................. 17.6 CIRCUIT DIAGRAM ..................................................................................... 17.7 CONTROL VALVES SAW PILOT VALVE .................................................................................. 17.4 FELLING HEAD ....................... SEE ORIGINAL MANUFACTURERS MANUAL PRESSURE SETTINGS .............................................................................. 17.8 SAW CONTROL VALVES MAIN SAW CONTROL VALVE ................................................................. 17.4 MAIN SAW CONTROL VALVE OPERATING DESCRIPTION ................. 17.4 SAW PILOT VALVE .................................................................................. 17.4 SAW PUMP.................................................................................................. 17.2

Tigercat 870B Feller Buncher

Saw drive

SAW PUMP The saw pump is an axial-piston variable displacement pump controlled by a pressure compensator. The pressure compensator is mounted directly onto the pump and has a STANDBY pressure adjustment and a P.O.R. adjustment.

The STANDBY adjusting screw is screwed completely in and is NOT used for this application.

The P.O.R. is adjusted to operate at 3600 psi.

Until system pressure reaches 3600 psi, the compensator valve will be in the "return" position blocking oil flow to the swashplate control piston leaving the pump at maximum displacement.

The pump is driven off the PTO of the left hand track drive pump which is mounted on pad 'A' of the pump drive gearbox.

870B-30

SAW PUMP SCHEMATIC

SAW PUMP

••

SAW PUMP PRESSURE COMPENSATOR

••

• L.H. TRACK DRIVE PUMP

870B-D13

PUMP ASSEMBLY 17.2

Tigercat 870B Feller Buncher •

Saw drive SAW PUMP PRESSURE COMPENSATOR VALVE

INPUT SHAFT CONNECTION TO LEFT HAND TRACK DRIVE PUMP

•

AP098

SAW PUMP ~ SIDE VIEW

17.3

Tigercat 870B Feller Buncher SAW CONTROL VALVES The saw circuit is controlled by a solenoid operated pilot valve and a pilot operated main control valve.

Saw drive MAIN SAW VALVE The main saw valve, located above the Linde main valve bank, is part of the wrist/clamps/saw valve. It consists of an open center spool section and an inlet section containing a relief valve.

Three other spool sections along with one mid inlet section control the wrist, clamp and accumulator functions. Each spool section is pilot operated.

An outlet section directs return oil back to tank.

For further description of wrist/clamps/saw valve refer to SECTION 18 of THIS MANUAL.

SAW PILOT VALVE

251-12

SAW PILOT VALVE The saw pilot valve, mounted above the pilot manifold, consists of an aluminum body which is houses a solenoid operated control valve cartridge.

DIN CONNECTOR

VALVE BODY

•

•

1

2

CONTROL VALVE CARTRIDGE

• SOLENOID

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

AT022

The saw spool section has a self centering, three position spool which is open centered. A spring in the spool end cap holds the spool in the center neutral position.

The spool is shifted by pilot pressure being applied to one end of the spool from the pilot valve. Shifting the spool directs oil from the saw pump to the saw motor.

3

•

MAIN SAW VALVE OPERATING DESCRIPTION Oil (system pressure) enters the end inlet section of the main control valve. When the spool is centered (at rest) the oil is allowed to pass through the saw spool section into a common tank passage of the wrist and clamp spool sections and back to tank via the outlet section.

From the tank passage, the oil leaves the valve through the outlet section and returns to tank.

The relief valve installed in the saw inlet section of the main saw valve is set higher than the saw pump compensator pressure setting and will limit the pressure should a pump regulator or "swashing" failure occur.

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

For a detail description of the relief valves, refer to RELIEF VALVES in SECTION 18 of this manual.

17.4

Tigercat 870B Feller Buncher SAW SECTION

Saw drive

MID INLET SECTION OUTLET SECTION

SAW END INLET SECTION

RETURN TO TANK

GAUGE TEST PORT (FOR SAW)

• •• ••

SAW

••

CLAMPS

••

• •• WRIST

••

••

SAW RELIEF (4000PSI) 1 " WRENCH

ACCUM.

•

GAUGE TEST PORT (FOR WRIST & CLAMPS)

MAIN (MID) RELIEF VALVE

POWER BEYOND PORT (TO SWING DRIVE GEARBOX)

SAW CONTROL VALVE (WITH WRIST AND CLAMPS)

104-9-1

PARALLEL PASSAGE

A

PLUG

LOAD CHECK VALVE

WORK PORT BRIDGE

'O' RING

B

•

•

ANTI CAVITATION VALVE

• •

•

• • PILOT END CAP 90136-4G

•

•

•

•

• •

SPOOL CENTERING SPRING

SPOOL TANK PASSAGE

THRU' NEUTRAL PASSAGE

CROSS SECTION OF SAW SPOOL SECTION 17.5

PILOT END CAP

Tigercat 870B Feller Buncher SAW CIRCUIT DESCRIPTION The saw blade (typically) 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.

The variable displacement saw pump supplies oil flow to the motor via the saw control valve. The main saw control valve is pilot operated and controls the flow of hydraulic oil from the pump to the saw motor. A relief valve is installed in the inlet section of the main saw control valve.

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

The saw switch located on the control panel in the cab is used to turn the saw ON or OFF. It is a two position switch controlling the flow of electrical current via a relay to the saw pilot valve solenoid.

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

NOTE: Saw will not operate with pilot system OFF. Saw will not function properly with low pilot pressure.

Saw drive When the saw switch is placed in the ON position, the solenoid operated pilot valve will be placed in the energized position directing pilot oil to shift the spool in main saw control valve. This will direct oil from the saw pump to the saw motor, causing the system pressure to rise and the saw blade to begin to rotate.

When the pressure (system pressure) builds up to 3600 psi the spool in the pump COMPENSATOR valve shifts to direct oil to the pump swashplate control piston. The piston moves the swashplate towards the neutral position to cut back the flow of oil while at the same time maintaining the pressure and continuing to rotate the blade.

This system has a lower horsepower requirement and generates less heat since the pump reduces it's output flow instead of dumping hydraulic oil over relief valves.

The saw motor adjusts its displacement in response to system pressure, this is only true with variable displacement motors.

Return oil from the saw motor is directed back to tank through a return line with a 1 psi check valve installed at the tank connection.

For explanation of saw motor, refer to saw head manufacturers manual.

NOTE: If the engine has been turned off or the pilot shut off system tripped (L.H. arm rest raised) with the saw switch left in the ON position, the saw will not start up when the engine is restarted or the arm rest lowered. In this case press the PILOT RESET button and turn the saw switch OFF and then ON. IMPORTANT: To maximize pump and motor life, do not shut the engine off until the saw blade has come to a complete stop.

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

With the main saw control valve spool in this neutral position, the hydraulic oil is directed through the open centre of the main control valve and back to tank. This prevents the saw pump from generating system pressure to rotate the blade, it also causes the saw pump to shift to maximum displacement.

17.6

Tigercat 870B Feller Buncher

870B-29

Saw drive

SAW CIRCUIT 17.7

Tigercat 870B Feller Buncher

Saw drive

PRESSURE SETTINGS: PUMP AND SAW CONTROL VALVE 1. Park machine on level ground, lower felling head to the ground and stop engine.

GAUGE TEST PORT (FOR SAW)

2. Block saw blade from rotating as per method outlined in saw head manufacturer’s manual.

••

3. Ensure that the hydraulic oil is at operating temperature.

4. Install a 0-5000 PSI pressure gauge on saw valve gauge test port.

••

5. On the pump compensator valve; •

•

Slacken jamnut on P.O.R. adjusting screw, and turn adjusting screw all the way in.

CAUTION: Do not use excessive force; stop when the resistance increases sharply. Tighten the jamnut.

SAW RELIEF (4000 PSI) - 1 " WRENCH 104-9-1

SAW CONTROL VALVE

7. Start the engine** and put throttle control to the IDLE position. **CAUTION: Before starting engine, ensure saw relief valve is unscrewed as stated in step 6, otherwise damage could occur to the piston pump.

The STANDBY valve adjusting screw is screwed fully IN (factory set) and must remain this way. This portion of the compensator is NOT USED.

6. On saw control valve, slacken the jamnut and turn adjusting nut on saw control relief valve OUT until spring pressure is relieved.

P.O.R. VALVE (3600 PSI)

STANDBY VALVE

SAW PUMP

••

• ••

SAW PUMP PRESSURE COMPENSATOR

•

• L.H. TRACK DRIVE PUMP

870B-D13

PUMP ASSEMBLY

17.8

Tigercat 870B Feller Buncher 8. Reset pilot system and turn the saw switch ON.

Saw drive SET MOTOR BEGIN OF REGULATION TO 3200 PSI

NOTE: Saw will not operate with pilot system OFF.

Refer to felling attachment manufacturer’s service literature for this procedure.

Saw will not function properly with low pilot pressure.

IMPORTANT: The motor begin of stroke setting must be at least 400 PSI lower than the pump P.O.R. setting.

NOTE: If the engine has been turned off or the pilot shut off system tripped (L.H. arm rest raised) with the saw switch left in the ON position, the saw will not start up when the engine is restarted or the arm rest lowered. In this case press the PILOT RESET button and turn the saw switch OFF and then ON.

SET MOTOR MINIMUM DISPLACEMENT Refer to felling attachment manufacturer’s service literature for this information.

9. Set the saw control valve relief*** pressure to 4000 psi. by slowly screwing the relief valve adjusting nut in until the required pressure reading is obtained.

10. Re-tighten jamnut, making sure adjusting nut does not turn.

11. Set P.O.R. on pump compensator to 3600 psi. (or to saw head manufacturers recommended value, which ever is lower) by slowly screwing the relief valve adjusting screw out until the required pressure reading is obtained.

IMPORTANT: Saw relief valve must be set at least 400 psi. above pump P.O.R. to avoid generation of excessive heat.

12. Re-tighten jamnut, making sure adjusting screw does not turn.

13. The adjusting screw on the STANDBY valve must remain screwed fully IN. 14. Remove all pressure gauges. ***Refer to RELIEF VALVE ADJUSTING PROCEDURE in section 18 of this manual.

17.9

Tigercat 870B Feller Buncher

Saw drive

17.10

Tigercat 870B Feller Buncher

SECTION 18 - TREE CLAMPS AND WRIST JANUARY 2003

CONTENTS - SECTION 18 CIRCUIT DESCRIPTION ................................................................................ 18.8 CIRCUIT DIAGRAM ....................................................................................... 18.9 CONTROL VALVE ........................................................................................ 18.4 PRESSURE SETTINGS .............................................................................. 18.10 AIR IN PILOT END CAPS ........................................................................ 18.10 PUMP CLAMPS/WRIST/CHARGE ............................................................... 18.3 RELIEF VALVE, ANTI-CAVITATION ............................................................. 18.6 RELIEF VALVE ADJUSTING PROCEDURE .............................................. 18.7

Tigercat 870B Feller Buncher

Tree clamps and wrist

18.2

Tigercat 870B Feller Buncher

Tree clamps and wrist 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.

CLAMPS/WRIST/CHARGE PUMP THRUST PLATES DRIVE GEAR ON INPUT SHAFT

DRIVE GEAR ON INPUT SHAFT

CONNECTING SHAFT

• • •

•

THRUST PLATES

•

OUTLET DRIVEN (IDLER) GEAR

• • •

•

•

AP113

•

•

• INPUT DRIVE SHAFT (CONNECTED TO MAIN PUMP)

DRIVE GEAR

GEAR HOUSINGS

PORT PLATE, REAR

WRIST/CLAMPS/CHARGE PUMP

This is a two cartridge dual gear pump driven off the PTO of the main pump . The input drive shaft is connected to the main pump drive shaft, which is a through shaft, by a drive coupling.

One of the two cartridges in the clamps/wrist/ charge pump provides hydraulic oil flow to the wrist, clamp and accumulating arms functions. In addition hydraulic oil is supplied to the swing drive gearbox for lubricating and cooling purposes via the PB port on the saw/wrist/clamp/accum valve.

The second cartridge acts as a charge pump providing hydraulic oil to the charge/pilot/filter manifold for use in the pilot circuit.

INLET GEAR1

TYPICAL GEAR PUMP

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 thrust plates. One of the two gears, called the drive gear, will be connected to the drive shaft. The other idler gear is driven by the drive gear.

WRIST/CLAMPS/ CHARGE PUMP

•

•

MAIN PUMP

870B-D11

PUMP ASSEMBLY 18.3

Tigercat 870B Feller Buncher

Tree clamps and wrist

CONTROL VALVES

Each spool is pilot operated. The outlet section is common to all four sections and returns oil to the hydraulic tank, some of which passes through the main Linde valve and the oil cooler before returning to tank.

For a detailed description of the pilot manifold refer to SECTION 5 of THIS MANUAL. For a detailed description of main and port relief valves, refer to ANTI-CAVITATION RELIEF VALVES in THIS SECTION.

Oil enters the mid inlet section and is allowed to pass through the three spool sections (wrist/clamp/ accumulating) and back to tank via the outlet section.

Each of the spool sections has a self centering 3position spool which is open center. 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 three functions (or all at the same time if required but with reduced flow to each).

WRIST/CLAMP/ACCUMULATING VALVE The valve consists of four open center spool sections, an end inlet section, a mid inlet section and an outlet section. The inlet (end) section feeds a single spool which is used for the saw function. The mid inlet section feeds the remaining three spools which are used for the wrist, clamp and accumulating arms functions.

SAW SECTION

MID INLET SECTION PILOT END CAPS

OUTLET SECTION

•• GAUGE TEST PORT (FOR SAW ONLY)

RETURN TO TANK

• •• SAW

••

CLAMPS

••

•• •• WRIST

••

ACCUM.

•• •

END INLET SECTION (SAW)

104-9-1

GAUGE TEST PORT (FOR WRIST & CLAMPS)

MAIN (MID) RELIEF VALVE

POWER BEYOND PORT (TO SWING DRIVE GEARBOX)

WRIST AND CLAMPS CONTROL VALVE (WITH SAW SECTION) 18.4

Tigercat 870B Feller Buncher

Tree clamps and wrist the PORT RELIEF VALVES.

IMPORTANT: Holding the CLAMP CLOSE button down on the joystick after the clamp cylinders are fully closed will not increase the clamping force on the trees, but will generate heat in the hydraulic system.

A MAIN RELIEF VALVE is also installed in the end inlet section of the saw section. This relief valve is set higher than the saw pump compensator pressure setting and will limit the pressure should a pump regulator or "swashing" failure occur.

To prevent over pressurizing of the operating circuits, each work port in the valve sections has a PORT RELIEF VALVE.

All relief valves are the same type (anti-cavitation relief valve). For a detailed description of these relief valves, refer to ANTI-CAVITATION RELIEF VALVES in THIS SECTION.

A MAIN RELIEF VALVE is installed in the mid inlet section of the valve. It controls the pressure to the three spool sections and is set lower than

OUTLET SECTION

•

•

CLOSE

OPEN

•

PORT RELIEF VALVES

RIGHT

• MID INLET SECTION

B

A

OPEN

•

A

B

CLOSE

•

A

B

LEFT

•

PORT RELIEF VALVES

MAIN RELIEF VALVE

•

• •

•

SAW SECTION

WRIST/CLAMP/ACCUMULATING VALVE (WITH SAW SECTION)

845-19

RELIEF VALVE PORT 'A'

PARALLEL PASSAGE

LOAD CHECK VALVE

WORK PORT BRIDGE

A

RELIEF VALVE PORT 'B'

B

•

• • •

•

•

•

•

•

• PILOT END CAP 90136-3

PILOT END CAP

•

SPOOL CENTERING SPRING

SPOOL TANK PASSAGE

THRU' NEUTRAL PASSAGE

CROSS SECTION OF SPOOL SECTIONS 18.5

Tigercat 870B Feller Buncher

Tree clamps and wrist ANTI-CAVITATION RELIEF VALVE LATER DESIGN

VALVE POPPET

T P

This valve is used as a MAIN and PORT relief valve in both the wrist, clamp and accumulating arms control valve(s).

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

T SEATING POPPET

Step 3.

T P

STEP 3

T VALVE POPPET

T

T

P

STEP 5

T CHECK POPPET

When pressure ‘P’ drops the pilot poppet closes and then the seating poppet moves back to its original position and permits oil pressure to flow into the cavity behind the valve poppet. As the seating poppet moves back it comes in contact with the valve poppet and its spring force plus the oil pressure cause the valve poppet to move back to the closed position.

As an anti-void or check valve

T P

ANTI-VOID CHECK OPERATION

As the seating poppet began to move away from the valve poppet, the valve poppet began to open under the effect of the pressure at P thus allowing a large volume of flow to tank. The drop in pressure behind the valve poppet when the seating poppet seats on the pilot poppet ensures full opening of the valve poppet.

Step 5.

T

VALVE 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.

Step 4.

P

STEP 4

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

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’.

18.6

Tigercat 870B Feller Buncher

Tree clamps and wrist

ANTI-CAVITATION RELIEF VALVE ADJUSTING PROCEDURE ADJUSTING NUT

•

JAMNUT, 1" WRENCH

•

1. Loosen jamnut.

2. Turn adjusting nut** to obtain desired pressure reading on gauge.

3. Lock jamnut against adjusting nut using 6 - 8 lbf/ft., making sure the adjusting screw does not turn.

5. Re-check relief setting. **IMPORTANT: Approach the gauge reading slowly and deliberately by turning adjusting nut in a little at a time.

For complete step-by-step pressure setting procedures of circuits using these relief valves, Refer to the appropriate sections in this manual.

18.7

Tigercat 870B Feller Buncher

Tree clamps and wrist IMPORTANT

This manual is applicable to factory installed machine functions and controls. It does not take into account any changes or modifications made after shipment. Verify all functions before operating this machine.

WRIST, CLAMP AND ACCUMULATING ARMS CIRCUIT DESCRIPTION The clamp and accumulating arms are each operated by independent hydraulic cylinders. The wrist cylinder extends or retracts to provide a clockwise or counter-clockwise rotation of the felling head. The cylinders receive oil from the fixed displacement wrist/clamps/charge pump via three spool sections in the wrist/clamp/ accumulating control valve.

The wrist is operated by trigger buttons on the joystick handles. The right hand button rotates the felling head in the counter-clockwise direction and the left hand button rotates the head in the clockwise direction. The switches operate solenoid pilot valves which direct pilot oil to the wrist section of the control valve to shift the spool.

The spool directs oil from the pump to either end of the cylinder and from the cylinder back to tank.

The clamp arm is operated by a 3 position thumb switch (OPEN/CLOSE, self centering to OFF) located on the right joystick control handle. The switch operates two solenoid pilot valves which direct pilot oil to the clamp arm spool section of the control valve, to shift the spool. The spool directs oil from the pump to either end of the cylinder and from the cylinder back to tank.

The accumulating arms are operated by a 3 position thumb switch (OPEN/CLOSE, self centering to OFF) located on the left joystick control handle. The switch operates two solenoid pilot valves which direct pilot oil to the accumulating arms spool section of the control valve, to shift the spool. The spool directs oil from the pump to either end of the cylinder and from the cylinder back to tank.

18.8

Tigercat 870B Feller Buncher

870B-28

Tree clamps and wrist

WRIST, CLAMP AND ACCUMULATING ARMS CIRCUIT DIAGRAM 18.9

Tigercat 870B Feller Buncher PRESSURE SETTINGS WARNING:. Ensure that no one is near the felling head during this procedure. Have the felling head on the ground during this procedure except when adjusting the wrist port relief valves. The swing brake should be applied at all times during this procedure.

Tree clamps and wrist 7. While holding the joystick thumb switch in the ACCUMULATING ARMS CLOSE position (cylinder fully extended), check gauge pressure reading. If less than 3200 psi., readjust accumulating arms close port relief.

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

IMPORTANT: During these procedures, Do Not hold thumb switch in the on position for longer than 5 seconds.

IMPORTANT: Avoid blowing oil over the relief for longer than 5 seconds, as this will cause excessive heating of the hydraulic fluid and possible damage to the pump.

IMPORTANT: Approach the gauge reading slowly and deliberately by turning adjusting nut in a little at a time. The pressure setting must not exceed the above value.

NOTE: For this type of main and port relief valve, Refer to RELIEF VALVE ADJUSTING PROCEDURE in THIS SECTION. AIR IN PILOT END CAPS Air accumulation in the pilot end caps of the wrist/clamp/accumulating control valve can cause the clamp arms to behave in a sluggish manor. To bleed the air: Pressurize the hydraulic tank to approximately 5 psi and loosen the suspected pilot end cap fitting to release the air. After completion, tighten the fittings and re-adjust the pressure in the hydraulic tank.

8. While holding the joystick thumb switch in the ACCUMULATING ARMS OPEN position (fully retracted), check gauge pressure reading.

If less than 3200 psi., readjust accumulating arms open port relief. Repeat above procedure until a gauge reading of 3200 psi is obtained.

9. While holding the joystick thumb switch in the CLAMP ARM CLOSE position (cylinder fully extended), check gauge pressure reading.

1. Park machine on level ground, lower the felling head to the ground, engage the swing brake and stop engine.

2. Ensure that hydraulic oil is at operating temperature.

3. Connect a 0 - 5000 p.s.i. pressure gauge to the wrist/clamp/accumulating control valve test port. The control valve is located on the fire wall behind the main valve.

4. Turn main relief adjusting nut all the way in.

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

If less than 3200 psi., readjust clamp close port relief. Repeat above procedure until a gauge reading of 3200 psi is obtained.

10. While holding the joystick thumb switch in the CLAMP ARM OPEN position (cylinder fully retracted), check gauge pressure reading.

If less than 3200 psi., readjust clamp open port relief. Repeat above procedure until a gauge reading of 3200 psi is obtained.

11. Raise the boom and rotate the felling head fully to one side. While holding the joystick wrist finger switch depressed, check gauge pressure reading.

If less than 3200 psi., readjust port relief.

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

6. Start the engine and set throttle to IDLE. NOTE: It may be necessary to increase the engine speed sufficiently to prevent the engine from stalling.

WARNING Accumulator and clamp arms open and close very rapidly. The felling head will also be rotated side to side during this procedure.

Operator must ensure that no one is near the felling head during these procedures.

18.10

Tigercat 870B Feller Buncher

Tree clamps and wrist

OUTLET SECTION ACCUM. ARMS 'CLOSE' PORT RELIEF (3200 PSI) UPPER CLAMP ARMS 'OPEN' PORT RELIEF (3200 PSI)

•

•

•

WRIST 'RIGHT' PORT RELIEF (3200 PSI)

• MID INLET SECTION

•

A

B

OPEN

A

B

CLOSE

•

RIGHT

A

B

LEFT

•

CLOSE

•

ACCUM. ARMS 'OPEN' PORT RELIEF (3200 PSI)

OPEN

UPPER CLAMP ARMS 'CLOSE' PORT RELIEF (3200 PSI)

WRIST 'LEFT' PORT RELIEF (3200 PSI)

•

•

MAIN RELIEF (2700 PSI) - 1 " WRENCH

GAUGE TEST PORT 04 JIC

SAW

•

GAUGE TEST PORT (FOR SAW) 04 JIC

845-19

WRIST/CLAMP/ACCUMULATING VALVE (WITH SAW SECTION)

12. With the boom raised, rotate the felling head fully to the other side. While holding the joystick wrist finger switch depressed, check gauge pressure reading.

If less than 3200 psi., readjust port relief.

Repeat above procedure until a gauge reading of 3200 psi is obtained. Center the felling head and lower to the ground.

13. With throttle control in the FULL position; Unscrew the main relief valve adjusting nut three full turns. While holding the joystick thumb switch in the ACCUMULATING ARMS OPEN position, check gauge pressure reading.

If less than 2700 psi, readjust main relief.

Repeat above procedure until a gauge reading of 2700 psi is obtained.

14. Remove pressure gauge.

18.11

Tigercat 870B Feller Buncher

Tree clamps and wrist

18.12