Tigercat 726 FELLER BUNCHER SERVICE MANUAL - PDF DOWNLOAD

SERVICE MANUAL Tigercat 726 FELLER BUNCHER Issue 4.1, MARCH 2003 TABLE OF CONTENTS SECTION GENERAL SPECIFICATIONS ........................................................................................... ii 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 COMPONENTS DESCRIPTION .................................................................. 4 DRIVE ............................................................................................................................... 8 BRAKES ............................................................................................................................ 9 CENTER JOINT AND STEERING ................................................................................... 11 LIFT BOOM ..................................................................................................................... 12 TILT ................................................................................................................................. 13 SAW DRIVE .................................................................................................................... 17 TREE CLAMPS WITH SAW ............................................................................................ 18

726-SM00

726 Available Literature Operator's Manual ................................. Part No. 4323A Service Manual (This Manual) .............. Part No. 1684A Parts Catalog ......................................... Part No. 1471A Hydraulic Adapters Book ....................... Part No. 1472A Hose assembly Book ............................. Part No. 3707A

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

Fax: (519) 442-1855

Tigercat 726 Feller Buncher

General Specifications

SPECIFICATIONS: DIMENSIONS (With 28L x 26 Tires)

OPTIONAL ........................ Up to 68 x 50.00 - 32 HYDRAULIC SYSTEM

WIDTH .......................................................................... 118" LENGTH Less felling head ..................................... 228" HEIGHT Overall, approx. ....................................... 139" Less removable skylight ........................ 127" WHEEL BASE ............................................................. 111" GROUND CLEARANCE: With 28L x 26 tires .................................... 21" With 30.5 x 32 tires ................................... 25" FRAME ARTICULATION ..................................... 41 deg WEIGHT Less felling head ........................... 26,000 lbs

HYDROSTATIC PUMP Variable disp. axial piston BOOM PUMP ................. Fixed displacement vane STEERING PUMP ........ Fixed displacement vane SAW PUMP ................... Dedicated var. displacement axial piston RESERVOIR .................. 85 Gallon capacity FILTRATION .................. 7 micron, full flow BOOM CYLINDERS ..... 4 Identical lift and tilt 4.5" bore STEER CYLINDERS .... 3" bore x 17" stroke

POWER

OPERATOR S STATION CAB .................... Fully enclosed and insulated 2 doors and removable skylight Air conditioner heater and defroster Lexan TM glazing Forward sloping windshield SEAT .................. Full suspension, 9 way adjustable Armrest mounted joystick CONTROLS ...... Hyd. proportional for boom and travel Electric switch for accumulating arms STEERING ........ Steering bar, variable speed hydraulic

ENGINE ............. Caterpillar 3116TA 195 HP @ 2200rpm COOLING ......... Oversize coarse finned radiator and Oil cooler Suction engine fan Removable debris screen at air intakes FUEL TANK ...... 90 gallon capacity POWER TRAIN HYDROSTATIC ........ Variable displacement pump Variable displacement motor TRANSFER CASE ... 2 Speed mechanical shift AXLES ....................... Front fixed Rear oscillating 15 deg. each way Differential locks, front and rear TRAVEL SPEEDS ... Low range ................... 0 - 4.7 mph High range .................. 0 - 9.6 mph

OTHER STANDARD EQUIPMENT Pressurized water system Precleaner and 2 Stage engine air cleaner Water separator for fuel system Back-up alarm ELECTRICAL BATTERY .......................... (2) 12 volt ALTERNATOR .................. 100 amp LIGHTING ......................... Optional

BRAKES DYNAMIC BRAKING ...................................... Hydrostatic SECONDARY BRAKESRear axle, enclosed, oil cooled PARK BRAKE ..................... Manual driveline disc brake

FELLING HEAD Flexible hydraulic system can be tailored to accept various felling heads including shear heads up to 22" and high speed continuous rotation circular saws up to 22"

TIRES STANDARD ....................... 28L x 12 ply

WE RESERVE THE RIGHT TO AMEND THESE SPECIFICATIONS AT ANY TIME WITHOUT NOTICE

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Tigercat 726 Feller Buncher

SECTION 1 - SAFETY MARCH 2003

CONTENTS - SECTION 1 ARTICULATION LOCK PIN ............................................................................... 1.8 BATTERY DISCONNECT SWITCH .................................................................. 1.6 COOLING SYSTEM .......................................................................................... 1.7 EXHAUST FUMES ............................................................................................ 1.8 FIRE PREVENTION FIRE PREVENTION GUIDELINES ............................................................... 1.9 WHAT ELSE TO DO BEFORE YOU EXPERIENCE A FIRE ...................... 1.10 WHAT TO DO AFTER A FIRE .................................................................... 1.11 WHAT TO DO IN CASE OF A MACHINE FIRE .......................................... 1.10 FIRST AID ......................................................................................................... 1.4 FLUID LEAKS ................................................................................................... 1.7 HYDRAULIC PRESSURE HAZARD .................................................................. 1.7 LOOSE CLOTHING HAZARD ........................................................................... 1.8 PROTECTIVE CLOTHING ................................................................................ 1.3 SAFETY PRECAUTIONS, GENERAL ....................................................... 1.3, 1.4 SAFETY PRECAUTIONS, OPERATING ................................................... 1.5, 1.6 SAFETY PRECAUTIONS, SERVICING ............................................................ 1.7 SAFETY SYMBOLS .......................................................................................... 1.2 SIGNAL WORDS............................................................................................... 1.2

Tigercat 726 Feller Buncher

Safety

SAFETY SYMBOLS

This safety-alert symbol is used throughout this manual and on labels on the machine to call your attention to areas in which carelessness or failure to follow specific procedures may result in personal injury and/or component damage or malfunction.

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.

1.2

Tigercat 726 Feller Buncher

Safety

GENERAL SAFETY PRECAUTIONS

KEEP BACK 300 FEET

Remember that safety is a prime responsibility of all.

When approaching an operating machine on foot, stay at least 300 feet (90M) away until the operator recognizes your presence. Make sure that all harvesting equipment is shut down before advancing to the machine.

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

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

Always avoid the discharge side of a felling sawhead.

A sawhead's high-velocity discharge of debris requires a safe separation distance.

Follow all instructions from safety inspector and supervisors.

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

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

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

Do not let an untrained person operate the machine.

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

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

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

These safety rules highlight both general and specific measures the operator should be familiar with and adhere to. More specific measures are illustrated with pictograms which may also be attached to the machine in locations pertinent to their respective message. Keep safety labels in good condition.

Repair or replace damaged labels.

Avoid mounting or dismounting the machine in areas with slippery surfaces.

1.3

If this is not possible clean up or cover slippery surfaces with a non-slip material.

Tigercat 726 Feller Buncher

Safety overhanging electrical powerlines are present.

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

GENERAL SAFETY PRECAUTIONS continued

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

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

Powerlines carrying more than 50,000 volts require a safety distance of 10 ft. (3m) plus 1/2 inch (10mm) for each addition 1,000 volts above the 50,000 volt level. If State/Provincial, local or job site regulations require even greater safety distances than stated above, adhere strictly to these regulations for your own protection.

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

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

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

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

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

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

Inspect the machine daily for signs of damage, unusual wear, fluid leaks, or faulty operation. Repair or replace malfunctioning parts and systems immediately.

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

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

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

Approach with extreme caution any area where

1.4

Tigercat 726 Feller Buncher

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

OPERATING SAFETY PRECAUTIONS

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

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

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

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

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

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

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

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

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

Sound the machine horn before starting the machine.

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

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

The operator’s seat is equipped with a seat belt. Use this belt at all times when operating the machine.

Start the engine according to the instructions in this manual.

1.5

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

Tigercat 726 Feller Buncher

Safety

OPERATING SAFETY PRECAUTIONS continued

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

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

Use only prearranged and approved signalling practices.

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

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

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

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

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

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

When parking the machine; • Park on level ground only and engage the swing brake.

• Do not park on a hillside or incline.

• Lower felling attachment onto level ground.

• Stop the engine and relieve any hydraulic pressure trapped in the system.

1.6

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

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

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

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

Tigercat 726 Feller Buncher

Safety

SERVICING SAFETY PRECAUTIONS

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

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

Never use your bare hand to check for fluid leaks.

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

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

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

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

Fluid leaks under pressure may not be visible.

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

Pressure can be maintained in a hydraulic system long after the power source and pump have been shut down. Lower the felling head to the ground and relieve trapped pressure (from accumulator) by operating brake pedal and/or joystick several times before performing work on components, or disconnecting any hoses.

Prior to welding on any part of the machine, it should be cleaned and a fire extinguisher should be made available at the welding location. Care must be taken in attaching the welding machine grounding clamp so current does not pass through bearings, especially the pivot bearing. Also, the battery positive terminal must be disconnected.

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.

1.7

Tigercat 726 Feller Buncher

Safety

SERVICING SAFETY PRECAUTIONS continued Do not change any pressure or relief setting unless authorized instruction has been obtained.

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

Always install 'T' handle retainer bolt.

Use only to support boom and felling head.

Do not use to set hydraulics pressures.

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.

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

Always 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.

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.

28-14A

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

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

WARNING Failure to follow these instructions could result in serious injury or death from crushing.

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

1.8

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 all operating safety precautions specified by felling head manufacturer.

Tigercat 726 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.

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

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

3. Remove debris and blow out dust regularly from the air intake doors, engine radiator, hydraulic oil cooler and A/C condenser core to prevent overheating of the engine and hydraulics. Refer to CLEANING A/C CONDENSER, OIL COOLER AND RADIATOR in SECTION 2 of the OPERATOR S MANUAL.

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

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

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

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.

1.9

Continued on page 10

Tigercat 726 Feller Buncher

Safety WHAT TO DO IN CASE OF A MACHINE FIRE

FIRE PREVENTION continued

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

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

Shut the engine off.

Activate the fire suppression system*

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

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.

WHAT ELSE TO DO BEFORE YOU EXPERIENCE A FIRE

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

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

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

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

Use the PASS method with most extinguishers.

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

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

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.

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 from page 9

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

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

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

You should have a dry chemical extinguisher rated ABC and a pressurized water extinguisher rated A. Prevent the fire from happening by ensuring that the machine is cleaned regularly and all systems are well maintained. *NOTE: Dry chemical fire suppression systems are offered by Tigercat as an optional installation on some of the Tigercat product lines. Please disregard any references made to fire suppression systems if not installed on your machine.

1.10

Tigercat 726 Feller Buncher

Safety WHAT TO DO AFTER A FIRE

FIRE PREVENTION continued

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.

1.11

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.

Tigercat 726 Feller Buncher

Safety

1.12

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

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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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using high speed disc saws safely

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

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

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

THE DANGERS

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

• Soil particles are thrown from the ground.

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

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

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

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

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

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using high speed disc saws safely

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

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

THROW ANGLE

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

•

•

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

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using high speed disc saws safely

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

THROW ANGLE

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

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

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

THROW ANGLE

NUDGED LOG WILL NOT CONTACT SAW TEETH.

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

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

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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

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

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

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

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

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

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

7

using high speed disc saws safely Comments and Instructions cont.

Tigercat

®

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

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

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

8

using high speed disc saws safely

Tigercat

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

FIGURE 7a

PLAN VIEW OF MACHINE SHOWING CLOCKWISE AND COUNTERCLOCKWISE BLADE ROTATION

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

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

9

®

using high speed disc saws safely Comments and Instructions cont.

Tigercat

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

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

SLAB

•

SLAB

• FE

ED

IN

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

TH DIR ROW EC TIO N

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

FIGURE 8

THROW ENGAGEMENT DISTANCE FELLING HEAD MOVING INTO SLAB/LOG

®

SLAB

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

• •

FIGURE 8b SIDE VIEW

FEED IN

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

10

FIGURE 8c TOP VIEW

using high speed disc saws safely Comments and Instructions cont.

Tigercat

®

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

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

• FE

ED

IN

FELLING HEAD MOVING INTO LOG PILE

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

SMALL LOG

THROW ENGAGEMENT DISTANCE LOG PILE

FEED IN

•

•

A SAW HOUSING WITHOUT SNOUTS ALLOWS A LONG THROW ENGAGEMENT DISTANCE

FIGURE 9b SIDE VIEW

FIGURE 9c TOP VIEW

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

FEED IN

11

using high speed disc saws safely Comments and Instructions cont.

Tigercat

®

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

UNCUT TREE OR STUMP BACKUP THROW ENGAGEMENT DISTANCE

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

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

FELLING HEAD MOVING INTO LOG

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

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

FELLING HEAD MOVING INTO STUMP (FEED SPEED)

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

12

using high speed disc saws safely Comments and Instructions cont.

Tigercat

®

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

THROW GAP

FIGURE 12: SAW BLADE THROW GAP

13

using high speed disc saws safely Comments and Instructions cont.

Tigercat

®

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

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

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

FIGURE 13: SAW BLADE ENTRANCE AND EXIT SPACE

14

using high speed disc saws safely Comments and Instructions cont.

Tigercat

®

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

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

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

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

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

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

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

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

Do not over speed the blade rpm.

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

Do not neglect tooth fastening inspection, maintenance and replacement.

Do not neglect to repair worn or damaged saw housings.

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

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

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

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

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

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

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

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

Do not select and operate heads that throw rearward.

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

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

15

using high speed disc saws safely

Tigercat

16

®

Tigercat 726 Feller Buncher

SECTION 3 - LUBRICATION & MAINTENANCE DEC. 95

CONTENTS - SECTION 3 FILTER AND LUBRICATION SCHEDULE .......... 3.6 GENERAL MAINTENANCE ................................ 3.3 HYDRAULIC OILS ............................................... 3.5 LUBRICATION SCHEDULE ................................ 3.6 NEW MACHINE MAINTENANCE FIRST 25 HOURS ............................................ 3.2 FIRST 500 HOURS .......................................... 3.2 PRESSURE SETTINGS 20" SAW, KOEHRING WATEROUS ................ 3.9 SCHEDULED MAINTENANCE ........................... 3.3 1000 HOURS ................................................... 3.5 125 HOURS ..................................................... 3.4 250 HOURS ..................................................... 3.4 500 HOURS ..................................................... 3.4 8 HOURS ......................................................... 3.3 FREQUENTLY ................................................. 3.3 SEASONAL ..................................................... 3.5 TIGHTENING POINTS ........................................ 3.2 TORQUE CHART ................................................ 3.7 TORQUE CHART, GENERAL ............................. 3.8 WHEELS, INSTALLING ....................................... 3.2

Tigercat 726 Feller Buncher

Lubrication and Maintenance • AXLE MOUNTING BOLTS

PREVENTIVE MAINTENANCE SCHEDULE FOR 726 FELLER BUNCHER

• WHEEL RETAINING BOLTS • CAB SECURING BOLTS • PIN RETAINERS • ANY OTHER LOOSE NUT, BOLT OR FITTING REFER TO DIESEL ENGINE SERVICE MANUAL AND ATTACHMENT MANUAL FOR ADDITIONAL REQUIRED MAINTENANCE AT THIS SCHEDULED TIME PERIOD.

NEW MACHINE MAINTENANCE

_______________________________________________________________________________________

IMPORTANT!

THE FIRST 500 HOURS:~

__________________________________________

WHEELS: REPLACE OIL IN:~

WHEN INSTALLING WHEELS, ENSURE THAT ALL PAINT HAS BEEN REMOVED FROM THE MATING SURFACES OF BOTH THE WHEEL DISC AND THE FLANGE OF THE AXLE TO ENSURE METAL TO METAL CONTACT. FOR MORE COMPLETE INSTRUCTIONS ALSO REFER TO SECTION 8 OF THE OPERATOR/ SERVICE MANUAL. __________________________________________

• BOTH AXLE DIFFERENTIALS. AXLES SHOULD BE COMPLETELY FULL OF OIL. REFER TO SECTION 8 OF THE OPERATOR/SERVICE MANUAL FOR DRAINING INSTRUCTIONS. • PUMP DRIVE GEARBOX • TRANSMISSION

THE FIRST 25 HOURS:~

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

CHECK:~ • OIL LEVEL IN BOTH AXLES DIFFERENTIALS AT FILLER PLUG. AXLES SHOULD BE COMPLETELY FULL OF OIL.

_______________________________________________________________________________________

REPLACE:~ • ENGINE FUEL FILTER • HYD.OIL PRESS. FILTER, CH. PUMP OUTLET • HYD. OIL RETURN FILTER, TRAV./STEER • HYD. OIL RETURN FILTERS, SAW/BOOM • HYD. OIL RETURN FILTER, PILOT

TIGHTENING POINTS:• ALL HYDRAULIC CONNECTIONS • HOSE CLAMPS • CENTER JOINT PIN SECURING BOLTS • TRANSMISSION SECURING BOLTS • ENGINE MOUNTING BOLTS • PUMP DRIVE GEARBOX SECURING BOLTS 3.2

Tigercat 726 Feller Buncher

GENERAL þ CLEAN AROUND FILLER CAPS BEFORE CHECKING OR ADDING FLUIDS þ CLEAN AROUND HYDRAULIC FITTINGS BEFORE BREAKING CONNECTION. PLUG OR CAP IMMEDIATELY þ CLEAN UP SPILLS AS SOON AS POSSIBLE þ ALWAYS USE CLEAN OIL AND CONTAINERS þ DRAIN DIRTY OIL WHILE STILL WARM þ DO NOT EXCEED RECOMMENDED FLUID LEVELS þ SERVICE ALL HYDRAULIC FILTERS AFTER THE FAILURE OF A PUMP, MOTOR, CYLINDER OR VALVE. FAILURES OF THIS NATURE COULD CONTAMINATE THE ENTIRE HYDRAULIC SYSTEM

Lubrication and Maintenance

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

8 HOURS:~ • PERFORM "FREQUENTLY" MAINTENANCE CHECK, AND IN ADDITION:~ • CHECK ENGINE COOLANT LEVEL • CHECK ENGINE OIL LEVEL • DRAIN FUEL/WATER SEPARATOR • CHECK AIR INTAKE PRECLEANER CLEAN BOWL AS REQUIRED

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

• CHECK HYDRAULIC OIL LEVEL

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

• CHECK TRANSMISSION OIL LEVEL AT DIPSTICK (LEVEL PLUG ON EARLIER MACHINES)

þ BEFORE WELDING ON MACHINE BE SURE MASTER SWITCH IS DISCONNECTED

• LUBRICATE AXLES ~ OUTER BEARINGS 1 FITTING, 4-PLACES, PURGE

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

• LUBRICATE MID DRIVE SHAFT AND 'U' JOINTS, 3-FITTINGS, PURGE

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

• LUBRICATE FRONT DRIVE SHAFT BEARING AND 'U' JOINT, 2-FITTINGS, PURGE

CAUTION ALL HANDLES, STEPS AND PLATFORMS MUST BE KEPT FREE OF GREASE, OIL, FUEL, MUD, SNOW AND ICE þ ALWAYS HAVE A FIRE EXTINGUISHER AT HAND þ FOR SAFETY, ALWAYS LOWER BOOM ASSY TO THE GROUND WHEN LEAVING CAB, LEAVING MACHINE UNATTENDED OR DURING SERVICE þ FOR SAFETY, ALWAYS INSTALL LIFT BOOM CYLINDER LOCKING DEVICE WHEN WORKING UNDER BOOM. (REFER TO SECTION 2 OF THIS MANUAL) 3.3

• CHECK PUMP DRIVE GEARBOX OIL LEVEL WITH DIPSTICK

• LUBRICATE REAR DRIVE SHAFT AND 'U' JOINTS, 3-FITTINGS, PURGE

• LUBRICATE CENTER JOINT BEARINGS, 2-FITTINGS, PURGE • LUBRICATE STEERING CYLINDER ENDS, 4-FITTINGS, PURGE • LUBRICATE TILT AND LIFT CYLINDER ENDS, 8-FITTINGS, PURGE • LUBRICATE LIFT BOOM AND TILT LINKAGE, 9-FITTINGS, PURGE

CLEAN:~ • POTENTIALLY DAMAGING LIMBS OR STICKS Continued on page 4

Tigercat 726 Feller Buncher

Lubrication and Maintenance

Continued from page 3

VISUALLY INSPECT FOR:-

CHECK:~

• FRAYED ELECTRICAL WIRING AND HYDRAULIC HOSE

• FOR LEAKAGE AROUND HYDRAULIC COMPONENTS AND FLEXIBLE HOSES

• WEAR IN ANY OTHER COMPONENTS

• FOR LOOSE NUTS, BOLTS AND FITTINGS • CONDITION AND TENSION OF FAN BELTS.

CLEAN/REPLACE:-

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

• AIR CONDITIONER RE-CIRCULATION FILTER

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

• CAB FRESH AIR FILTER • REMOVE TWO ACCESS PANELS ON EACH SIDE OF ENGINE ENCLOSURE AND CLEAN BETWEEN RADIATOR AND OIL COOLER

• CONDUCT AN OVERALL VISUAL INSPECTION.

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

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

_______________________________________________________________________________________

250 HOURS:~

______________________________________________________________________________________

125 HOURS:~ • PERFORM "FREQUENTLY" MAINTENANCE

• PERFORM "FREQUENTLY" MAINTENANCE

• PERFORM 8 HOUR MAINTENANCE

• PERFORM 8 HOUR MAINTENANCE

• PERFORM 125 HOUR MAINTENANCE

AND IN ADDITION:~ • LUBRICATE REAR AXLE PIVOT, FITTINGS, PURGE

AND IN ADDITION:~

2-

• REPLACE ENGINE OIL AND CHANGE OIL FILTER

• LUBRICATE GEAR SHIFT LINKAGE, 2-FITTINGS, PURGE

• REPLACE ENGINE FUEL FILTER • DRAIN FUEL/WATER SEPARATOR

CHECK:-

• REPLACE AIR INTAKE PRIMARY ELEMENT

• FLUID LEVEL IN BATTERIES UNLESS MAINTENANCE FREE

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

• ENGINE R.P.M. • ALL HYDRAULIC PRESSURES

_______________________________________________________________________________________

• HYDRAULIC PUMP AND MOTOR SECURING BOLTS • TORQUE TIGHTENING POINTS AS PER NEW MACHINE MAINTENANCE

VISUALLY CHECK FOR DAMAGE TO:• LIFT BOOM AND TILT LINKAGE • FRONT AND REAR FRAME • CENTER JOINT AREA • ATTACHMENT MAKE REPAIRS IMMEDIATELY 3.4

Tigercat 726 Feller Buncher

Lubrication and Maintenance

500 HOURS:~

APPROVED HYDRAULIC OILS

• PERFORM "FREQUENTLY" MAINTENANCE IN ADDITION TO PROVIDING THE VEHICLE WITH ITS NORMAL OPERATIONAL FUNCTIONS, HYDRAULIC OIL IS ALSO USED TO FILL THE AXLE ASSEMBLIES, APPLY BRAKES AND OPERATE DIFFERENTIAL LOCKS.

• PERFORM 8 HOUR MAINTENANCE • PERFORM 125 HOUR MAINTENANCE • PERFORM 250 HOUR MAINTENANCE AND IN ADDITION REPLACE:~ • AIR INTAKE SAFETY ELEMENT

WET DISK BRAKES IN THE AXLES REQUIRE OIL WITH SPECIFIC PROPERTIES TO ENSURE REDUCED CHATTER AND ENSURE PROPER LUBRICATION OF MECHANICAL COMPONENTS.

• HYD.OIL PRESS. FILTER, CH. PUMP OUTLET • HYD. OIL RETURN FILTER, TRAV./STEER • HYD. OIL RETURN FILTERS, SAW/BOOM

USE ONLY ONE OF THE FOLLOWING OILS TO FILL OR REPLENISH THE HYDRAULIC SYSTEM.

• HYD. OIL RETURN FILTER, PILOT REFER TO DIESEL ENGINE SERVICE MANUAL AND ATTACHMENT MANUAL FOR ADDITIONAL REQUIRED MAINTENANCE AT THIS SCHEDULED TIME PERIOD.

1000 HOURS:~ • PERFORM "FREQUENTLY" MAINTENANCE • PERFORM 8 HOUR MAINTENANCE • PERFORM 125 HOUR MAINTENANCE

CHEVRON

TRACTOR HYDRAULIC FLUID (SUMMER)

CITGO

TRACTOR HYDRAULIC FLUID (33-310) (SUMMER)

IMPERIAL

ESSO HYDRAUL 56 (SUMMER) HYDRAUL 50 (LOW VISC) (WINTER)

SHELL

DONAX TD (SUMMER) DONAX TDL (WINTER)

SUN

SUNFLEET TH FLUID (SUMMER)

JOHN DEERE TYPE J20C (HY-GARDTM) (SUMMER) TYPE J20D (HY-GARDTM) (WINTER)

• PERFORM 250 HOUR MAINTENANCE • PERFORM 500 HOUR MAINTENANCE AND IN ADDITION REPLACE OIL IN:~ • PUMP DRIVE GEARBOX • TRANSMISSION CHECK:~ ACCUMULATOR CHARGE VALVE STRAINER REFER TO DIESEL ENGINE SERVICE MANUAL AND ATTACHMENT MANUAL FOR ADDITIONAL REQUIRED MAINTENANCE AT THIS SCHEDULED TIME PERIOD.

SEASONAL:~ DRAIN AND REFILL HYDRAULIC OIL TANK AND BOTH FRONT AND REAR AXLES WITH RECOMMENDED HYDRAULIC OIL. SEE "APPROVED HYDRAULIC OILS" ALSO SEE SECTION 8 OF THE OPERATOR/SERVICE MANUAL FOR AXLE DRAINING PROCEDURE.

3.5

REF. NUMBER

1000HOURS

500 HOURS

250 HOURS

125 HOURS

EVERY SHIFT 8 HOURS

FIRST 25 HOURS

Tigercat 726 Feller Buncher

CHK CHANGE COOLANT 1 EVERY 2 YEARS CHK REP 2

Lubrication and Maintenance

FILTER AND LUBRICATION SCHEDULE DESCRIPTION COOLING SYSTEM 50% ANTIFREEZE 50% WATER

CAPACITY REMARKS/LUBRICANT LITRE USG No. 32 8.5 16L (4.25 USG) ANTIFREEZE ** 16L (4.25 USG) DISTLD. WATER

ENGINE OIL/FILTER CAT. CUMMINS

15 18.9

SEE ENGINE MANUFACTURER’S MAINTENANCE MANUAL

4 5

REP

REP

3

FUEL FILTER (ENGINE)

1

REP DRN

REP

4

FUEL/WATER SEPARATOR

1

5

AIR INTAKE PRECLEANER

1

CLEAN BOWL AS REQ'D

5

AIR INTAKE PRIMARY ELEMENT

1

CHECK FILTER RESTRICTION INDICATOR WITH ENGINE RUNNING

5

AIR INTAKE SAFETY ELEMENT

1

7

HYDRAULIC RESERVOIR

CHK REP REP CHK

320

85

1

REP

REP

8

RETURN FILTER, TRAVEL/STEER

1

REP

REP

9

RETURN FILTER, (DUAL) SAW/BOOM

1

REP

REP

10 RETURN FILTER, PILOT

1

11 REP

REP CHK

12 CHARGE PRESS. OUTLET FILTER D/R 13 PUMP DRIVE GEARBOX

4.02

1.1

1

15 AXLES - DIFFERENTIAL • FRONT • REAR

FILL WITH MIL-L-2105Cor API-GL-5 LUBRICANT GRADE/ WEATHER TEMPERATURE:

D/R 14 TRANSMISSION 7.6 2 1 CHECK LEVEL AT LEVEL PLUG (EARLY MACHINES) DIPSTICK ON LATER MACHINES

CHK*

CHECK FILTER RESTRICTION INDICATOR ON FILTER WITH ENGINE RUNNING AT FULL AND WITH OIL FLOW

1

CHECK LEVEL WITH DIPSTICK CHK

DRAIN AND REFILL AS REQ’D

BY SEASONAL OIL CHANGE SEE HYD. OIL CHART

41 32

10.8 8.5

BELOW -10°F(-23°C) USE 75W UP TO 100°F (38°C) USE 80W-90 ABOVE 100°F(38°C) USE 85W-140

1 1

*CHK LEVEL FIRST 25 HRS. *D/R FIRST 500 HRS CHECK LEVEL AT DIFF. FILLER PLUG. D/R WITH SEASONAL OIL CHANGE

16 AXLE - PIVOT (REAR ONLY)

PURGE

2

LITHIUM BASE EP2 GREASE u

LUB

17 AXLES - OUTER BEARINGS

PURGE

4

LITHIUM BASE EP2 GREASE u NOTE: LUB EVERY 50 HRS. IF NOT EXPOSED TO MUD AND WATER

LUB

18 DRIVE SHAFT, MID: SHAFT & U-JOINTS DRIVE SHAFT, REAR: SHAFT & U-JOINTS DRIVE SHAFT, FRONT: U-JOINT & BEARING

PURGE PURGE PURGE

3 3 2

LITHIUM BASE EP2 GREASE u LITHIUM BASE EP2 GREASE u LITHIUM BASE EP2 GREASE u

LUB

19 CENTRE JOINT

PURGE

2

LITHIUM BASE EP2 GREASE u

LUB

29 STEERING CYLINDERS

PURGE

4

LITHIUM BASE EP2 GREASE u

LUB

21 TILT AND LIFT CYLINDERS

PURGE

8

LITHIUM BASE EP2 GREASE u

LUB

22 LIFTBOOM AND TILT LINKAGE

PURGE

9

LITHIUM BASE EP2 GREASE u

1

REMOVE, CLEAN OR REPLACE

2

LITHIUM BASE EP2 GREASE u

LUB

CHK 23 ACCUM. VALVE STRAINER LUB

24 GEAR SHIFT LINKAGE

PURGE

u LITHIUM BASED EP2 GREASE CONTAINING MOLYBDENUM DISULFIDE **ANTIFREEZE MUST MEET GM 6038M SPECIFICATIONS • SEE ENGINE MANUFACTURERS MAINTENANCE MANUAL LEGEND: CHK - CHECK REP - REPLACE DRN - DRAIN D/R - DRAIN AND REFILL LUB - LUBRICATE ISSUE 2 1295

3.6

Tigercat 726 Feller Buncher

Lubrication and Maintenance

TORQUE CHART LOCATION

THREAD DIAMETER

Cylinders Pin bolts Piston nut, steer cyl.

Piston nut, boom/tilt cyl.

Gland, steer cyl.

Keeper plate bolts

TORQUE (LUBRICATED) lbf-ft Nm

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

282-310 930 1640 450 282-310

393-420 1282 2260 620 389-427

1" UNC

682-750

617-679

Center joint bearing Bearing retaining bolts Pin retaining bolts

1/2" UNC 3/4" UNC

80-88 282-310

109-119 393-420

Engine mounting Bolts Bolts, brkt. to bell hsg.

7/8" UNC M16

600 200

827 275

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

3/8" UNC 3/8" UNC 5/8" UNC

33-36 33-36 159-175

45-49 45-49 216-237

1" UNC 5/8" UNC

250-275 159-175

339-373 216-237

3/8" UNF

37-49

50-66

1/2" UNF

70-80

95-108

Axle mounting bolts Front Rear

7/8" UNC 3/4" UNC

455-501 282-310

617-679 393-420

Wheel bolts

3/4" UNC

282-310

393-420

Cab securing bolts

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

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

3.7

Tigercat 726 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

3.8

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

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

Tigercat 726 Feller Buncher

Lubrication and Maintenance

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

Engine RPM ...................................................... 2200 RPM MAX 1000 RPM IDLE Hydrostatics: Charge Pressure Rexroth Pump ....................................................450 PSI @ 2200 RPM Rexroth Motor ....................................................NON - ADJUSTABLE or Rexroth Pump ....................................................450 Sundstrand Motor .............................................. 400

PSI @ 2200 RPM PSI @ 2200 RPM

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

PSI PSI PSI PSI

@ @ @ @

2200 2200 1000 1000

RPM RPM RPM RPM

Drive Motor P.O.R. (Begin of Stroke) ................3700 PSI @ 1000 RPM (SEE NOTE) NOTE: Gauge reading at 'M' port on motor should be 500-800 psi to obtain the 3700 psi setting. See procedure in SECTION 8 of the SERVICE MANUAL.

Steer Main Relief ...............................................2500 PSI @ 2200 RPM Steer Port Relief Left .........................................3200 PSI @ 1000 RP Steer Port Relief Right ....................................... 3200 PSI @ 1000 RPM Attachment Pump Saw Pump P.O.R. .............................................. 3600 PSI @ 1000 RPM Saw Pump Low Pressure Control ...................... 200-300 PSI @ 1000 RPM S/N 7260101 TO 7260441 Saw Pump Low Pressure Control ...................... Turned in Fully S/N 7260442 & UP Saw Blade Speed .............................................. 1175 ± 25 RPM Saw Motor Begin of Regulation ......................... 3100 PSI @ 2200 RPM Saw Control Valve Main Relief .......................... 4200 PSI @ 1000 RPM S/N 7260101 TO 7260441 Boom Valve Saw Main Relief ................................................. 3900 PSI Mid Inlet Main Relief .......................................... 2600 PSI Tilt Back Port Relief ...........................................2900 PSI Tilt Forward Port Relief ......................................2900 PSI Accumulator Close Port Relief ........................... 3200 PSI Accumulator Open Port Relief ........................... 3200 PSI Clamp Open Port Relief ..................................... 2000 PSI 1100 PSI Clamp Close Port Relief ....................................3200 PSI Lift Up Port Relief ...............................................2900 PSI Lift Down Port Relief .......................................... 2200 PSI Pilot Pressure Reducing Valve ..........................550 Pilot Pressure Relief Valve ................................ 675

@ 1000 @ 2200 @ 1000 @ 1000 @ 1000 @ 1000 @ 1000 @ 1000 @ 1000 @ 1000 @ 1000

RPM S/N 7260442 & UP RPM RPM RPM RPM RPM RPM S/N 7260101-0441 RPM S/N 7260442 & UP RPM RPM RPM

PSI @ 1000 RPM PSI @ 1000 RPM

Brake Maximum Pressure .................................1000 PSI @ 1000 RPM ISSUE 6 1295

3.9

Tigercat 726 Feller Buncher

Lubrication and Maintenance

3.10

Tigercat 726 Feller Buncher

SECTION 4 -

HYDRAULIC COMPONENT DESCRIPTIONS JULY95

CONTENTS - SECTION 4 RELIEF VALVE ADJUSTING PROCEDURE ......................... 4.4 EARLY DESIGN .......................................... 4.2 LATER DESIGN ........................................... 4.3

Tigercat 726 Feller Buncher

Hydraulic Component Descriptions ANTI-CAVITATION RELIEF VALVE EARLIER DESIGN

VALVE POPPET

T

This valve is used as a MAIN and PORT relief valve in both the steer and boom control valves.

P

Operation: Step 1.

T

‘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.

STEP 1 PILOT POPPET

T Step 2.

P

STEP 2

When the pressure at ‘P’ reaches the relief valve setting, the pilot poppet unseats and allows oil in the inner cavity to flow to tank, thus lowering the pressure in the cavity between the pilot poppet and the other poppets.

T SEATING POPPET

T Step 3.

As a result of the opening of the pilot poppet, the seating poppet moves back, due to the pressure drop caused by oil flow through the bore of the seating poppet, and seats against the pilot poppet.

This shuts off the flow of oil through the seating poppet and the cavity pressure now drops to tank pressure.

P

STEP 3

T VALVE POPPET

T

Step 4.

As the seating poppet began to move away from the valve poppet, the valve poppet began to open under the effect of the pressure at P thus allowing a large volume of flow to tank. The drop in pressure behind the valve poppet when the seating poppet seats on the pilot poppet ensures full opening of the valve poppet.

P

STEP 4

T VALVE POPPET

Step 5.

T

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.

P T STEP 5 CHECK POPPET

T

As an anti-void or check valve The anti-void unit supplies oil to the pressure area ‘P’ when its pressure drops below the pressure in the tank gallery of the valve. The valve then acts as a free flow check valve and prevents cavitation. In this condition, the pressure at ‘P’ is lower than at ‘T’ and due to the shape of the check poppet, the pressure forces cause the poppet to unseat, allowing oil to flow from ‘T’ to ‘P’.

P

ANTI-VOID CHECK OPERATION

T 4.2

Tigercat 726 Feller Buncher

Hydraulic Component Descriptions ANTI-CAVITATION RELIEF VALVE LATER DESIGN

VALVE POPPET

This valve is used as a MAIN and PORT relief valve in both the steer and boom control valves.

T P

Operation: Step 1.

‘P’ represents a high pressure area and ‘T’ represents tank. Under normal operation, ‘P’ is below the relief pressures, the valve poppet is firmly seated and oil cannot flow to tank.

T

STEP 1 PILOT POPPET

T P

STEP 2

When the pressure at ‘P’ reaches the relief valve setting, the pilot poppet unseats and allows oil in the inner cavity to flow to tank, thus lowering the pressure in the cavity between the pilot poppet and the other poppets.

T SEATING POPPET

T P

STEP 3

T VALVE POPPET

T

T

P

STEP 5

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

Step 3.

As a result of the opening of the pilot poppet, the seating poppet moves back, due to the pressure drop caused by oil flow through the bore of the seating poppet, and seats against the pilot poppet.

This shuts off the flow of oil through the seating poppet and the cavity pressure now drops to tank pressure.

Step 4.

P

STEP 4

Step 2.

When pressure ‘P’ drops the pilot poppet closes and then the seating poppet moves back to its original position and permits oil pressure to flow into the cavity behind the valve poppet. As the seating poppet moves back it comes in contact with the valve poppet and its spring force plus the oil pressure cause the valve poppet to move back to the closed position.

T CHECK POPPET

As an anti-void or check valve

T P

ANTI-VOID CHECK OPERATION

T 4.3

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’.

Tigercat 726 Feller Buncher

Hydraulic Component Descriptions

ANTI-CAVITATION RELIEF VALVE ADJUSTING PROCEDURE (EARLIER DESIGN) 1. Remove acorn nut on end of the relief valve.

2. Slacken off jamnut and using a slotted screwdriver turn adjusting screw¯ to obtain desired pressure reading on pressure gauge.

3. Re-tighten jamnut using 6 - 8 lbf/ft., making sure the adjusting screw does not turn.

4. Replace and re-tighten acorn nut 6 - 8 lbf/ft.

5. Re-check relief setting.

ACORN NUT

•

JAMNUT, -11/16" WRENCH

• •

ADJUSTING SCREW, - SLOTTED SCREW DRIVER

EARLIER DESIGN

ANTI-CAVITATION RELIEF VALVE ADJUSTING PROCEDURE (LATER DESIGN) 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.

ADJUSTING NUT

•

JAMNUT, 1" WRENCH

•

LATER DESIGN ¯IMPORTANT: Approach the gauge reading slowly and deliberately by turning adjusting screw 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. ________________________________________

4.4

Tigercat 726 Feller Buncher

SECTION 8 - DRIVE JULY 95

CONTENTS - SECTION 8 AXLES AIR AND HYD. CONNECTIONS ............... 8.17 BRAKES .................................................... 8.18 BLEEDING ............................................. 8.18 LINING INSPECTION ............................ 8.18 BRAKES, HYD. SCHEM.. See SECTION 9 DIFF. LOCKS ............................................. 8.18 DIFF. LOCKS, HYD. SCHEM.. See SECTION 9 DIFFERENTIAL ......................................... 8.18 OIL CAPACITY ...... 8.20. See also SECTION 3 OIL CHECK LOCATION ............................ 8.19 OIL FILL HOLE LOCATION ....................... 8.19 OIL LEVEL CONTROL .............................. 8.19 PLANETARY FINAL DRIVE ....................... 8.19 PRESSURIZED DIFF. CASE ..................... 8.19 SERVICE BRAKES (REAR ONLY) ............ 8.18 DRIVE SYSTEM DRIVE FOOT CONTROL VALVE ................ 8.6 DRIVE PREVENT VALVE ............................ 8.6 REXROTH CREEP ..................................................... 8.8 DRIVE SYSTEM DESCRIPTION ............. 8.8 MOTOR DESCRIPTION .......................... 8.4 MOTOR PRESSURE SETTINGS .......... 8.10 PUMP DESCRIPTION ............................. 8.2 PUMP PRESSURE SETTINGS ................ 8.9 SCHEMATIC DIAGRAM ......................... 8.14 SET MOTOR MIN. DISPLACEMENT ..... 8.11 SET MOTOR P.O.R. .............................. 8.10 SUNDSTRAND CREEP ..................................................... 8.8 DRIVE SYSTEM DESCRIPTION ............. 8.8 MOTOR DESCRIPTION .................. 8.4, 8.5 PRESSURE SETTINGS ......................... 8.12 SCHEMATIC DIAGRAM ......................... 8.15 SET MOTOR CHARGE PRES. RELIEF . 8.13 SET MOTOR MIN. DISPLACEMENT ..... 8.13 SET MOTOR P.O.R. .............................. 8.12 TRANSMISSION OPERATION .............................................. 8.16 WHEEL INSTALLATION INSTALLATION ......................................... 8.20 TAPERED ASSEMBLY STUD ................... 8.20

Tigercat 726 Feller Buncher

Drive

HYDROSTATIC DRIVE PUMP Rexroth

such as used on this machine. All the necessary valves and the charge pump are built into the unit.

Hydraulic oil for the hydrostatic drive motor is supplied by an axial piston variable displacement pump with an internal gear type charge pump.

The pump is mounted at the top center of the pump drive gearbox. A splined adapter connects the pump shaft to the pump drive gearbox output shaft.

This variable displacement pump is of swashplate design for use in closed loop hydrostatic transmissions

The swashplate angle is controlled by pilot oil pressure from the charge pump. When no pilot oil is supplied, i.e., neither drive pedal depressed, the swashplate is in its neutral position and no oil is pumped. Make-up oil or charge pump oil is instead returned to tank via the low pressure charge pump relief valve.

PORT 'B'

PORT 'A'

CHARGE PUMP RELIEF

TO DRIVE CONTROL VALVE

'B' PORT RELIEF

The charge pump, mounted on the back of the drive pump provides "make up" oil to the low pressure side of the "closed loop circuit" via internal ports in the pump. It also provides pilot oil to the DRIVE control valve (foot pedals). Because the charge pump oil is being continuously drawn from and returned to the hydraulic tank, it also functions as a cooling oil.

'A' PORT RELIEF CONTROL CYLINDER P.O.R. VALVE

SWASH PLATE CONTROL VALVE

The DRIVE control valve sends a pressure signal to the pump to shift the spool in the pump's swashplate

CHARGE PUMP GAUGE TEST PORT 'B'

GAUGE TEST PORT 'A' SM27

The volume and direction of oil flow from the pump is controlled by the angle of the pumps swashplate.

When the swashplate is at its maximum displacement angle the pump will produce full flow. As the angle decreases so does the flow until there is no flow at an angle of 0°. Traversing the swashplate through the neutral position steplessly reverses the direction of flow through the pump providing a FORWARD or REVERSE condition.

DRIVE PUMP SCHEMATIC

CONTROL CYLINDER DRIVE SHAFT

SWASHPLATE CONTROL VALVE

P.O.R. VALVE

GAUGE TEST PORT 'B' PORT 'B'

CHARGE PUMP RELIEF

CHARGE PUMP

PORT 'B' 'B' PORT RELIEF

RR-9

SWASHPLATE

GAUGE TEST PORT 'A'

SPLINED COUPLING PORT 'A'

DRIVE PUMP (REXROTH) 8.2

'A' PORT RELIEF

RR-10

PORT 'A' CROSS SECTION THRU' PORT PLATE BODY

Tigercat 726 Feller Buncher

Drive

control valve which in turn directs oil from the charge pump to the control cylinder to change the angle of the swashplate.

The distance the swashplate moves and therefore the speed of the vehicle is directly proportional to the position of the drive foot pedal(s).

Two relief valves ( 'A' and 'B' ports) and a pressure override valve (P.O.R.) are included in the pump to control or regulate system pressure.

The P.O.R. valve limits the system pressure by sensing high pressure and de-stroking the swashplate, there-by reducing pump flow. The function of the P.O.R. valve is to protect the system from excessive pressures.

The two high pressure relief valves 'A' and 'B' are intended to act as a pressure limiting safety device in case the P.O.R. valve malfunctions or does not react quickly enough in response to high pressure spikes.

IMPORTANT Oil going over the high pressure relief valves generates very large amounts of heat. therefore to prevent frequent operation of them, it is most important that the settings of the high pressure relief valves be set substantially higher than the P.O.R. setting.

The charge pump circuit has its own relief valve. It allows oil from the charge pump circuit to flow to tank when the preset pressure is reached.

The pressure override valve, the 'A' and 'B' port relief valves and the charge pump relief valve are adjusted in the same manner. Using a 3 mm allen wrench and a 10mm box wrench, loosen the locknut. Turning the adjusting screw counter-clockwise reduces the pressure setting, while turning clockwise increases the pressure setting. For pressure setting procedures see DRIVE SYSTEM PRESSURE SETTINGS.

_________________________________________

8.3

Tigercat 726 Feller Buncher

Drive

HYDROSTATIC DRIVE MOTOR The motor is mounted to the input side of the transmission. A splined coupling connects the motor shaft to the transmission input shaft.

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

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

The angle of the pistons relative to the drive shaft determine the speed of the motor and the available torque.

FLUSHING VALVE

...In a Rexroth motor The angle of the pistons is variable and is changed by an internal control cylinder that receives high pressure oil via the MOTOR'S pressure override valve (P.O.R.).

Except for when the CREEP switch is ON, the spool in the P.O.R. valve is moved by system pressure from the high pressure side of the loop. The point at which the spool begins to move is known as "begin of regulation set point" or "pressure override set point".

The MOTOR P.O.R. set point must be correctly set for the system to function properly. SEE REXROTH HYDROSTATIC DRIVE MOTOR PRESSURE SETTINGS in this section.

In the CREEP mode pilot oil moves and holds the P.O.R. valve spool and keeps the motor at maximum displacement.

CONTROL CYLINDER

A minimum displacement adjusting screw on the outside of the motor housing limits the maximum speed of the motor.

P.O.R. VALVE

WARNING: Improper adjustment of Minimum displacement adjusting screw can result in motor failure due to overspeeding. When installing a new motor always ensure stroke limiting screw is set correctly. Refer to SET MOTOR MINIMUM DISPLACEMENT-Rexroth, in this section.

FROM CREEP SOLENOID VALVE

FROM PUMP (B) AQ2SC

Reducing the angle provides increased speed with less torque. Increasing the angle will reduce the speed and provide more torque.

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

Continued on page 5

FROM PUMP (A)

DRIVE MOTOR SCHEMATIC (Rexroth)

DRIVE SHAFT

MINIMUM DISPLACEMENT ADJUSTING SCREW

•

•

'M'

FLUSHING VALVE

• 'A'

'B'

•

ROTATING GROUP

P.O.R. ADJUSTING SCREW 52

•

'A'

'G'

DRIVE MOTOR, 160cc (Rexroth) 8.4

'X'

VIEW 'A'

52A

Tigercat 726 Feller Buncher

Drive

Continued from page 4

will only run at maximum displacement when signalled by the P.C.O.R. valve.

...In a Sundstrand motor The angle of the pistons is variable and is changed by an internal control cylinder that receives high pressure oil via a combination of the MOTOR'S shuttle valve, the displacement control valve and the P.C.O.R. valve.

Except for when the CREEP switch is ON, the motor

The point at which the spool in the P.C.O.R. valve begins to move is known as "P.C.O.R. set point" or in Rexroth terminology "begin of regulation set point".

The MOTOR P.C.O.R. set point must be correctly set for the system to function properly. SEE SUNDSTRAND HYDROSTATIC DRIVE MOTOR PRESSURE SETTINGS in this section.

In the CREEP mode pilot oil is removed from the end of the displacement control valve spool allowing pilot oil, via the shuttle valve, to enter the end of the control cylinder and hold the motor at maximum displacement.

DISPLACEMENT CONTROL VALVE

When CREEP is OFF pilot oil via port X1 moves the displacement control valve spool allowing pilot oil to enter the 'back' of the control cylinder and de-stroke the motor.

CONTROL CYLINDER

FLUSHING VALVE

A minimum displacement adjusting screw on the outside of the motor housing limits the maximum speed of the motor.

CHARGE PRESSURE RELIEF VALVE

WARNING: Improper adjustment of Minimum displacement adjusting screw can result in motor failure due to overspeeding. When installing a new motor always ensure stroke limiting screw is set correctly. Refer to SET MOTOR MINIMUM DISPLACEMENT - Sundstrand, in this section.

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

SHUTTLE VALVE

AQ6SC

P.C.O.R. VALVE FROM PUMP (A)

FROM CREEP SOLENOID VALVE

FROM PUMP (B)

DRIVE MOTOR SCHEMATIC (Sundstrand) PRESSURE COMPENSATOR OVERRIDE (P.C.O.R.) CONTROL PRESSURE PORT (X1)

'M4' PORT

P.O.R. ADJUSTING SCREW MINIMUM DISPLACEMENT ADJUSTING SCREW

A

B

PISTONS

'A' 'M6' PORT

DRIVE SHAFT

53A

'M3' PORT

CHARGE PRESSURE RELIEF VALVE

SERVO PISTON CYLINDER 53

VIEW 'A' 8.5

DRIVE MOTOR (Sundstrand)

Tigercat 726 Feller Buncher

Drive

DRIVE FOOT CONTROL VALVE

through the regulating spring (3).

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

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

Both this foot control valve and the joystick valve use a similar spool arrangement.

Operated by foot, this valve directs pilot pressure to the swashplate control valve on the drive pump to drive the machine either forward or reverse

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

DRIVE PREVENT VALVE This solenoid operated spool valve prevents the machine from being driven either forward or in reverse when the parking brake is ON. OPERATING DESCRIPTION When the solenoid valve is de-energized (parking brake ON) the spool connects both drive pilot lines going from the drive foot control to the drive pump, to tank.

WORK PORTS 1, OR 2 RR-11

SOLENOID AND CONNECTOR

SM-29

SPOOL ARRANGEMENT

OPERATING DESCRIPTION P1

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

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

P2

SPOOL SECTION VALVE BLOCK

At the same time the regulating spool (2) is moved

PORT 1

PORT 2 V-04

DRIVE PREVENT VALVE

This causes same pressure in both pilot lines regardless of which foot pedal, forward or reverse, is depressed.

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

2

1

_________________________________________ P RR-13

T

DRIVE PILOT VALVE 8.6

Tigercat 726 Feller Buncher

Drive

8.7

Tigercat 726 Feller Buncher

Drive

DRIVE SYSTEM

mode. Creep mode is when the motor is set at maximum displacement, providing increased torque and reduced speed.

The hydraulic drive system delivers engine power to the drive train by means of hydraulic oil. An axial piston variable displacement pump (with an internal gear charge pump), is mounted on the pump drive gearbox. This pump provides hydraulic oil in a closed looped system to a variable displacement (axial piston, bent axis) motor which is mounted to the transmission.

For a Rexroth motor placing the switch in the ON position energizes the solenoid pilot valve and directs pilot oil to shift the motor P.O.R. valve spool and place the motor at maximum displacement.

For a Sundstrand motor placing the switch in the ON position de-energizes the solenoid pilot valve and directs pilot oil from the motor P.O.R. valve spool back to tank and place the motor at maximum displacement.

The charge pump provides make up oil for the "loop", cooling oil and pilot oil for the drive system operation. The oil enters the loop at the low pressure side of the pump.

The direction of rotation of the motor depends upon the direction of fluid flow from the pump. The motor speed of rotation of the output shaft is dependent upon the load on the output shaft. The higher the load, the slower the RPM. The output shaft is connected to the transmission, which provides power to both the front and rear wheels.

The DRIVE foot control pilot valve in the cab directs pilot oil to move the Swashplate of the pump, which controls the amount of hydraulic fluid to be pumped, as well as the direction. The pump provides oil at a rate that is proportional to the position of the drive foot pedal and the rate does not depend on the direction of travel.

Placing the CREEP switch (located in the cab) in the ON position will send a signal to the CREEP solenoid pilot valve to put the hydrostatic drive into CREEP 5 mm ALLEN KEY 17 mm WRENCH

P.O.R. VALVE • 3mm ALLEN KEY • 10mm WRENCH

'B' PORT RELIEF

'A' PORT RELIEF CHARGE PRESS. RELIEF • 3 mm ALLEN KEY • 10 mm WRENCH

GAUGE TEST PORT 'MB' • 3/16" ALLEN KEY • PORT SIZE - 04 ORB 'TEE' GAUGE TEST PORT (G) • PORT SIZE - 04 JIC

GAUGE TEST PORT 'MA' • 3/16" ALLEN KEY • PORT SIZE - 04 ORB 25-15A

MAIN DRIVE PUMP 8.8

Tigercat 726 Feller Buncher

Drive

DRIVE SYSTEM - PRESSURE SETTINGS:

WARNING: Do not permit high pressure relief valves to operate for periods longer than 5 - 10 seconds as this will cause excessive heating of the hydraulic fluid. DO NOT set relief pressures with the engine at high RPM’s.

HYDROSTATIC DRIVE PUMP PRESSURE SETTINGS: NOTE: Relief valves are set by loosening the locknut and turning the adjusting screw out (counterclockwise) to reduce the pressure setting and in (clockwise) to increase the pressure setting.

1.

Set parking brake ON.

2.

Connect a 0-10,000 psi pressure gauge to port 'MA' on the pump and a 0-1000 psi pressure gauge to the "capped" test port at the Tee connection from port 'G' on the hydrostatic drive pump.

3.

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

4.

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

5.

Turn the pressure override valve (P.O.R.) adjusting screw in (clockwise). Do not overtighten, or breakage will result.

6.

Start the engine, raise to FULL throttle and set the charge pressure relief valve to 450 psi. (01000 PSI gauge).

7.

8.

10.

Turn off the machine, connect the same 010,000 psi gauge to port 'MB' and reinstall plug in port 'MA'.

11.

Set parking brake ON, start the engine and set at 1000 rpm.

12.

Depress the brake pedal and put the parking brake in the OFF position.

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

13.

NOTE: If engine stalling is experienced increase throttle position just enough to cause the engine to run smoothly.

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

Set engine speed at 1000 rpm and put the transmission into HIGH gear. WARNING: If the transmission is in LOW gear, the vehicle will be able to move when setting the relief pressures.

Depress the BRAKE pedal and put the parking brake in the OFF position.

WARNING: Do not permit high pressure relief valves to operate for periods longer than 5 - 10 seconds as this will cause excessive heating of the hydraulic fluid. DO NOT set relief pressures with the engine at high RPM’s.

14.

Turn the P.O.R. adjusting screw counterclockwise, all the way out.

15.

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

(NOTE: The hydrostatic drive system will not operate if the parking brake is not FULLY OFF.) 9.

With the aid of an assistant, hold down the brake pedal, and while depressing the FORWARD foot pedal through 1/3 to 1/2 of its full travel, set the port 'B' relief valve to 5400 psi. @ 1000 rpm.

With the aid of an assistant, hold down the brake pedal, and while depressing the REVERSE foot pedal through 1/3 to 1/2 of its full travel, set the port 'A' relief valve to 5400 psi. @ 1000 engine rpm.

NOTE: If engine stalling is experienced increase throttle position just enough to cause the engine to run smoothly.

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

16.

Set the parking brake ON and shut off the engine.

17.

Remove all pressure gauges and reinstall all plugs and caps.

_________________________________________

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

8.9

Tigercat 726 Feller Buncher

Drive

MINIMUM DISPLACEMENT ADJUSTING SCREW - 6mm ALLEN KEY 3/8" (9.5mm) - 19mm WRENCH

PORT 'M' • 6 ORB 1/4" ALLEN KEY

PORT 'B'

52

'A'

P.O.R. ADJUSTING SCREW - 3mm ALLEN KEY - 10mm WRENCH

DRIVE MOTOR ~ REXROTH (160cc size)

REXROTH HYDROSTATIC DRIVE MOTOR PRESSURE SETTINGS:

8.

1.

Set parking brake ON.

2.

Connect a 0-6000 psi pressure gauge to port ‘M’ of the hydrostatic drive motor, and a 0 6000 psi pressure gauge to port ‘MB’ of the hydrostatic drive pump.

3.

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

4.

Put the transmission into HIGH gear.

WARNING: If the transmission is in LOW gear, the vehicle will be able to move when setting the relief pressures.

5.

PORT 'G' • 6 ORB 1/4" ALLEN KEY

SET MOTOR PRESSURE OVERRIDE (P.O.R.) REXROTH TERMINOLOGY (BEGIN OF REGULATION)

With the aid of an assistant, hold down the brake pedal, and while depressing the FORWARD foot pedal, set the P.O.R. on the hydrostatic drive pump to 3700 psi.

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

8.10

52A

With the aid of an assistant, hold down the brake pedal, depress the FORWARD or REVERSE foot pedal and observe the pressure at port 'M' on the hydrostatic drive motor, a reading of 500 - 800 psi should register if the motor P.O.R. is set correctly.

The motor P.O.R. setpoint is now set to 3700 psi. While holding the adjusting screw from turning, Lock the jam nut on the adjusting screw. Start engine and re check gauge.

9.

7.

VIEW 'A'

If reading is LOW; Stop engine, turn motor P.O.R. adjusting screw 1/8 turn IN (clockwise).

Start engine and observe gauge, continue this procedure until a correct reading (500 - 800 psi) is obtained.

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

Ensure the CREEP switch is in the OFF position prior to setting the motor P.O.R.

PORT 'X'

If reading is HIGH; Stop engine, turn the motor P.O.R. adjusting screw 1/8 turn OUT (counterclockwise). Start engine and observe gauge, continue this procedure until a correct reading (500 - 800 psi) is obtained.

Start the engine, set throttle control to IDLE, depress the brake pedal and put the parking brake in the OFF position.

6.

PORT 'A'

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

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

10.

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

11.

Remove all pressure gauges and reinstall all plugs and caps.

Continued on page 11

Tigercat 726 Feller Buncher

Drive

MINIMUM DISPLACEMENT ADJUSTING SCREW

'M' PORT

25-10A

DRIVE MOTOR (REXROTH)

Continued from page 10

SET MOTOR MINIMUM DISPLACEMENT WARNING: Improper adjustment of Minimum displacement adjusting screw can result in motor failure due to overspeeding. When installing a new motor always ensure stroke limiting screw is set correctly.

12.

Adjust the minimum displacement adjusting screw so that the distance from end of the screw to top of nut is a maximum of 3/8" (9.5 mm).

8.11

Tigercat 726 Feller Buncher 'M4' PORT - 6 ORB - 11/16" WRENCH

Drive

P.O.R. ADJUSTING SCREW - LARGE SLOT SCREW DRIVER - 1 1/16" WRENCH

1" (25mm)

MINIMUM DISPLACEMENT ADJUSTING SCREW - 6mm ALLEN KEY - 19mm WRENCH

'A' CHARGE PRESSURE RELIEF VALVE - SLOT SCREW DRIVER - 1 1/16" WRENCH

'M6' PORT - 6 ORB - 11/16" WRENCH 53A

53

VIEW 'A'

8.

SUNDSTRAND HYDROSTATIC DRIVE MOTOR PRESSURE SETTINGS: 1.

Set parking brake ON.

2.

Connect 0-6000 psi pressure gauges to ports M3 and 'M4’ of the hydrostatic drive motor, a 06000 psi pressure gauge to port ‘MB’ of the hydrostatic drive pump and a 0-500 psi pressure gauge to port ‘M6’ of the hydrostatic drive motor.

3.

4.

5.

The motor P.O.R. setpoint is now set to 3700 psi. While holding the adjusting screw from turning, lock the jam nut on the adjusting screw and re-check gauges.

Put the transmission into HIGH gear.

9.

SET MOTOR PRESS. OVERRIDE (P.O.R.)

Repeat STEP 8 but with the REVERSE pedal.

The readings on gauges at ports 'M3' and 'M4' should be equal as in STEP 8. Any noticable difference may indicate a problem with the pressure supply shuttle spool.

Start the engine, set throttle control to IDLE, depress the brake pedal and put the parking brake in the OFF position.

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

With the aid of an assistant, hold down the brake pedal, depress the FORWARD foot pedal and observe the pressure readings at ports 'M'3 and 'M4' on the hydrostatic drive motor, if the motor P.O.R. is set correctly, the gauges should show equal readings. the values they show are not important for this procedure.

If readings are not equal, loosen the locknut on the P.O.R adjusting screw and turn the screw one way or the other until the readings on the gauges are equal.

Ensure that the hydraulic oil temperature is between 120° F and 140° F. WARNING: If the transmission is in LOW gear, the vehicle will be able to move when setting the relief pressures.

DRIVE MOTOR (SUNDSTRAND)

10.

With the aid of an assistant, hold down the brake pedal, and while depressing the FORWARD foot pedal, reset the P.O.R. on the hydrostatic drive pump to 4800 psi.

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

SUNDSTRAND TERMINOLOGY (P.C.O.R.)

6.

Ensure the CREEP switch is in the OFF position prior to setting the motor P.O.R.

7.

With the aid of an assistant, hold down the brake pedal, and while depressing the FORWARD foot pedal, set the P.O.R. on the hydrostatic drive pump to 3700 psi.

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

8.12

Continued on page 13

Tigercat 726 Feller Buncher

Drive SET MOTOR MINIMUM DISPLACEMENT

MIN. DISP. ADJUSTING SCREW

WARNING: Improper adjustment of Minimum displacement adjusting screw can result in motor failure due to overspeeding. When installing a new motor always ensure stroke limiting screw is set correctly.

16.

Adjust the minimum displacement adjusting screw so that the distance from the end of the screw to the housing spot face is a maximum of 1" (25 mm).

_________________________________________ 25-13A

DRIVE MOTOR (SUNDSTRAND)

Continued from page 12

SET MOTOR CHARGE PRESSURE RELIEF VALVE (SUNDSTRAND MOTOR ONLY)

NOTE: The charge pressure relief on the PUMP is set 50 psi higher than the MOTOR charge pressure relief setting of 400 psi. Therefore, the PUMP charge pressure relief must be set correctly at 450 psi before making any adjustments to the motor.

11.

Raise engine speed to FULL throttle.

12.

Set parking brake in fully OFF position.

13.

With the aid of an assistant, hold down the brake pedal, and while depressing the FORWARD foot pedal, observe pressure reading on 0-500 gauge in M6 port of motor. A reading of 400 psi should register if the relief valve is set correctly.

If the reading is incorrect, stop the engine and turn the charge pressure relief valve adjusting screw 1/4 turn IN or OUT. Clockwise rotation of the adjusting screw increases the pressure setting, and counter-clockwise rotation decreases the pressure setting.

Start the engine and re check the gauge reading.

Repeat this procedure until the correct setting is obtained.Lock the jamnut on the adjusting screw and torque to 38 lbs-ft (52 Nm). Start engine and re check gauge.

14.

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

15.

Remove all pressure gauges and reinstall all plugs and caps.

8.13

Tigercat 726 Feller Buncher

SM-06

Drive

DRIVE CIRCUIT (Rexroth pump and motor) 8.14

Tigercat 726 Feller Buncher

SM13

Drive

DRIVE CIRCUIT (Rexroth pump, Sundstrand motor) 8.15

Tigercat 726 Feller Buncher

Drive The gears and bearings in the gearbox are lubricated by splash lubrication inside the case. The oil level in the gearbox must be up to the level plug as shown in the illustration (on earlier machines). On later machines a dip stick is provided. Refer SECTION 3 of this manual for the recommended lubricant.

TRANSMISSION This is a two speed manual shift transmission.

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

OPERATION Pulling up or pushing down the gearshift lever in the cab moves the shift lever (1), which moves the shift collar (2), which connects either the low gear (3) or the high gear (4) to the input shaft (5).

Detent balls between the collar and shaft provide positive feel for the selected range. This results in either low speed operation , or high speed operation.

The mid position is neutral.

MINIMUM OIL LEVEL

NOTE: Shift gears only when the machine is stationary and on level ground, Slight depression of the drive pedals may be used to facilitate shifting from one gear to the next.

2

1009A

1 SHIFT LEVER

4 SHIFT LEVER

FROM MOTOR

FROM MOTOR 3

5

TO REAR AXLE DIFF.

TO FRONT AXLE DIFF.

TO FRONT AXLE DIFF. TO REAR AXLE DIFF. OUTPUT SHAFT

OIL TROUGH BK002SM1

BK002SM2

HIGH SPEED OPERATION

LOW SPEED OPERATION

8.16

Tigercat 726 Feller Buncher

Drive

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

DRAIN (TOP)

The front axle assembly is bolted directly to the front frame. The rear axle assembly is pivot mounted to the rear frame allowing it to oscillate.

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

DIFF. LOCK (BTM.)

Each axle assembly consists of (1) input yoke, (2) spiral bevel gear set, (3) differential gear set, (4) Hydraulic diff. lock, (5) Inboard multiple wet disk brakes, (1-each side in rear axle only) (6) inboard planetary final drives, 1-each side and (7) axle housings and shafts.

TURBO AIR

26KSM

FRONT AXLE

DIFF. LOCK (TOP)

BRAKE

The lubricant in both axle assemblies is hydraulic oil.

There are drain lines from each axle plumbed into the machine hydraulic system. These drain lines take care of internal leakage from the diff. locks and brakes, which use the same hydraulic oil as the machine.

TURBO AIR (TOP)

DRAIN

27KSM

REAR AXLE

AIR AND HYDRAULIC CONNECTIONS

1

2

3 4

6

7

5 AXL-3

AXLE ASSEMBLY CROSS SECTION (REAR SHOWN) 8.17

Tigercat 726 Feller Buncher

Drive

DIFFERENTIAL AND DIFFERENTIAL LOCKS The differentials (3) distribute the power to each side of the axle while allowing the wheels to turn at different speeds. The differential locks (4), in the front and rear axle assemblies, are hydraulically controlled and can be independently turned ON or OFF by switches in the cab.

Placing one or both switches in the ON position, energizes the differential lock control valve solenoid (located on the pilot manifold) and directs pilot oil to the corresponding differential clutch pack assembly pistons to lock the differential(s).

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

BRAKE LINING INSPECTION Inspection ports are provided in the differential case and are located on each side of the pivot boss when viewed from the side oposite the input shaft. They are also in a similar location for the front axle.

•

Remove brake inspection port plugs

•

Inspect brake linings on both sides of the disk.

•

If brake lining material is worn down to the bottom of the oil grooves, brake backing plate and annular piston pressure plate assemblies must be replaced.

BRAKE BLEEDING

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

The rear axle assembly is equipped with two brake bleed screws, one for each side. Brakes must be bled whenever there has been potential for air to enter the system, such as removal of hydraulic line.

Both passages must be bled one at a time.

SERVICE BRAKES (REAR AXLE ONLY)

PROCEDURE

Also see SECTION 9 in this manual for information on the hydraulic circuit etc.

1. Place parking brake ON.

The "wet" disk type service brakes consist of an

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

IMPORTANT

SINGLE BRAKE LINE ACTUATES BOTH BRAKES BRAKE DISK BACKING PLATE

BLEED SCREWS

SINGLE BRAKE PEDAL

ANNULAR PISTON REAR AXLE ASSEMBLY AXL-BRK

ANNULAR BRAKE

annular piston, a brake disk with brake facing material, and a brake backing plate. One brake assembly is located on each side of the differential case and before the final drive.

AXL-BRK1

DUAL BRAKES (REAR AXLE)

3. Start engine and run at IDLE 4. Loosen bleed screw

The piston and the backing plate are attached to the case and the brake disk is splined on to the sun gear of the planetary final drive.

When the brake foot control in the cab is depressed, brake pressure oil moves the piston up against the brake disk and traps it between the piston and the backing plate to apply the brakes. Maximum operating pressure for the brakes is 1000 psi.

8.18

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

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

7. Release brake pedal.

8. Repeat above procedure for each bleed screw.

Tigercat 726 Feller Buncher

Drive

PLANETARY FINAL DRIVE The final drive (6) is an inboard mounted planetary gear arrangement which further reduces speed and increases torque to the axles. The input side receives drive power from the differential via a sun gear shaft.

The output side (planetary carrier) is splined on to the axle.

Air from the engine is supplied to the axles through a special fitting that screws into the engine air intake manifold. When the engine is under load, there is air pressure in the manifold. A special tee fitting has two orifices, restricting air flow to the axles.

HOSES TO FRONT AND REAR AXLES

PRESSURIZED DIFFERENTIAL CASE OIL LEVEL CONTROL (Used on machine serial Nos. 7260101-7260297

••

To guard against too much oil building up inside the differential case due to normal leakage from the clutch pistons, the differential cases are pressurized with air from the engine turbocharger.

FROM TURBOCHAGER

A

DRAIN TO TANK

C

SPECIAL TEE FITTING ENGINE AIR INTAKE MANIFOLD

B 14-11A

AIR BOOST CONNECTION (EARLIER MACHINES)

• •

The air boost line has a check valve installed in the axle housing to eliminate the possibility oil getting back to the engine intake manifold due to low engine air intake pressure.

C D

AXL-AIR

••

NON-PRESSURIZED DIFFERENTIAL CASE OIL LEVEL CONTROL (Used on machine Serial Nos. 7260298 and up) Pressurizing the differential case was discontinued after serial number 7260297.

PRESSURIZED DIFFERENTIAL CASE (EARLIER MACHINES)

The pressurized air (A) flows from the air intake manifold into the top of the case. A drain line (B) connects to two vertical tubes (C) that extend from the top of the differential case down to the axle center line (D).

If the oil level is below the end of the tubes, air flows through the axle and the drain line to tank and is vented to atmosphere.

If the oil level rises above the end of the tubes due to differential lock seal ring leakage, it is forced by the pressurized air, up the pipes and through the drain line to tank.

The axles are now allowed to completely fill with oil to the top of the differential case. Excess oil drains back to the hydraulic tank via a drain line.

It is recommended that earlier machines with pressurized differential cases should be converted to this later method as per Tigercat Product Support Bulletin No. 107.

OIL FILL HOLE LOCATION The oil fill hole is a 1 1/16" 'O' ring port on the cover of the differential case in the upper right corner as viewed from the input shaft side.

OIL CHECK LOCATION Their are two 1 1/16" 'O' ring port oil level check holes located on each side of the pivot boss when viewed from the side opposite the input shaft. They are also in a similar location for the front axle. Use these ports WITH A PRESSURIZED DIFFERENTIAL case arrangement.

On machines WITHOUT A PRESSURIZED DIFFERENTIAL CASE, the oil level should be up to the oil fill hole. To verify the level, loosen and back off the plug slowly and observe for oil seeping out from around the threads.

8.19

Tigercat 726 Feller Buncher

Drive

DRAINING THE AXLES Care should be taken when draining the hydraulic oil from the axles not to also drain the oil from the hydraulic tank due to siphoning.

3/8" ORB PLUG

WHEEL INSTALLATION Note: All wheel installation joints and surfaces should be clean, flat surfaces (free of paint, grease and oil etc.) using quality hardware and standard toque practices.

•

•

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

The tapered assembly stud shown can be fabricated to aid in wheel installation on an axle flange with 3/4" - UNC tapped holes

2.17"

Therefore before removing the drain plug in the axle(s), remove the 3/8" ORB plug on the side of the differential case to allow for ventilation when the oil is being drained.

Replace the drain plug and the 3/8" ORB plug.

OIL CAPACITIES (MINIMUM) Front axle capacity (FULL) 11 gallons rear axle capacity (FULL) 9 gallons

MIN. FULL THREAD .06" x 45° 3/4" - 10 UNC THREAD

.79" .406" DRILL

20°

2.64" 3.41" AXL-WHL

TAPERED ASSEMBLY STUD Refer to LUBRICATION SCHEDULE in SECTION 3 of this manual.

•

Thoroughly clean the wheel bolts, washers and the tapped holes in the axle flange.

_________________________________________

•

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

•

Install wheel bolts by hand to insure bolts are not cross threaded.

•

Remove assembly studs and install the remaining bolts.

•

Torque wheel bolts to 282-310 lbsf-ft.

Warning: If a power wrench is used, be sure that the wheel bolts are first hand-engaged to prevent stripping.

Operate the wrench slowly to prevent damage to the threads. _________________________________________

8.20

Tigercat 726 Feller Buncher

SECTION 9 - BRAKES NOV. 97

CONTENTS - SECTION 9 ACCUMULATOR ............................................. 9.4 CHARGING AND TESTING DEVICE .......... 9.4 CHARGING THE ACCUMULATOR ............. 9.4 CHECKING GAS PRESSURE ..................... 9.4 BRAKES ACCUMULATOR CHARGE VALVE ............. 9.3 CIRCUIT DESC. .......................................... 9.6 CIRCUIT SCHEMATIC ................................ 9.7 FOOT CONTROL VALVE ............................ 9.2 PARKING BRAKE ........................................ 9.8 CHARGE VALVE, BRAKE ACCUMULATOR .. 9.3 DIFFERENTIAL LOCKS: CIRCUIT DESC. .......................................... 9.6 CIRCUIT SCHEMATIC ................................ 9.7 PRESSURE SETTINGS .............................. 9.6 PILOT MANIFOLD ................................... 9.5, 9.6 OPERATING DESCRIPTION ...................... 9.5 PRESSURE REDUCING VALVE ................. 9.5 PRESSURE SETTINGS .............................. 9.6 RELIEF VALVE ............................................ 9.5 SOL. OPERATED VALVES ......................... 9.5 PRESSURE REDUCING VALVE .................... 9.5

Tigercat 726 Feller Buncher

Brakes

BRAKE PILOT VALVE This pilot valve is a manually operated directional valve and operates on the same principal as a pressure reducing valve.

As the pedal is depressed, pressure is provided to the brakes in the rear axle from the accumulator. A reaction piston in the valve senses this increase in brake pressure and relays feedback to the operator, ie. as brake pressure increases the pedal effort increases proportionately.

A positive stop in the brake valve limits the brake pressure to a preset value.

This preset value is determined by the requirements of the brakes in the rear axle, which in this case is 1000 psi. The brake pedal therefore regulates the pressure in the brake lines to 1000psi.

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

_________________________________________

A

P

T

T A P

MO-02

CROSS SECTION OF VALVE BODY MO-01

BRAKE VALVE

9.2

Tigercat 726 Feller Buncher

Brakes

BRAKE ACCUMULATOR CHARGE VALVE The brake accumulator charge valve controls the flow of oil to the accumulator and to the steer valve.

An internal filter is incorporated in the charge valve through which all oil going to the accumulator must flow. This filter should be removed and cleaned or replaced every 1000 hours. Except for this filter, no adjustments or pressure settings are required.

T TO ACCUM.

O TO STEERING

PRESSURE PORT

The rate at which the accumulator is charged depends on the orifice in the CHECK VALVE SEAT. When the accumulator is charged to its high limit, this pressure will unseat the UPPER LIMIT CHECK BALL, and seat the LOWER LIMIT CHECK BALL. When the UPPER LIMIT CHECK BALL is unseated, the pressure in the chamber back of the CHARGING VALVE SPOOL is allowed to flow to return; thus permitting the CHARGING VALVE SPOOL to unload the pump.

FLOW THRU' PORT (STEERING)

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

DRAIN PORT MO-03

ACCUM. PORT

When the pressure in the accumulator reaches its lower limit, the PILOT VALVE SPRING will unseat the LOWER LIMIT CHECK BALL, and at the same time, seat the UPPER LIMIT CHECK BALL. The PILOT VALVE SPOOL permits only one of these balls to be seated at any time.

When the LOWER LIMIT CHECK BALL is unseated, pressure from the accumulator enters the chamber back of the CHARGING VALVE SPOOL. This allows the CHARGING VALVE SPRING and the accumulator hydraulic force to balance the hydraulic force due to the pump pressure acting on the opposite end of the CHARGING VALVE SPOOL. This means that the pump pressure is always higher than the accumulator pressure which causes the accumulator to charge.

A

P

OPERATING DESCRIPTION When the accumulator is charged above its lower limit, the CHARGING VALVE SPOOL is held against the spool stop by normal system back pressure through drilled passage which directs the pressure to one end of the spool. The LOWER LIMIT CHECK BALL is held on its seat by accumulator pressure.

BRAKE ACCUMULATOR CHARGE VALVE

SYSTEM PRESSURE PILOT VALVE SPOOL

ACCUMULATOR PRESSURE PILOT VALVE SPOOL

UPPER LIMIT CHECK BALL

TO ACCUMULATOR

RETURN LINE PRESSURE UPPER LIMIT CHECK BALL

TO ACCUMULATOR

RETURN

RETURN

LOWER LIMIT CHECK BALL

LOWER LIMIT CHECK BALL PILOT VALVE SPRING

CHECK VALVE ORIFICE

PILOT VALVE SPRING

CHECK VALVE ORIFICE

CHARGING VALVE SPRING

CHARGING VALVE SPRING

SPOOL STOP

TO STEERING VALVE

PRESS. PORT

ACCUMULATOR CHARGED MO-04

CHARGING VALVE SPOOL

SPOOL STOP

TO STEERING VALVE

PRESS. PORT

ACCUMULATOR BEING CHARGED

TYPICALCHARGING VALVE SCHEMATICS 9.3

CHARGING VALVE SPOOL

Tigercat 726 Feller Buncher

Brakes

ACCUMULATOR The accumulator is a bladder type and is installed with a nitrogen pre-charge pressure of approximately 750 psi.

NITROGEN BOTTLE HOSE*

ADAPTER*

The gas pressure should be checked if the pilot system exhibits repeated and frequent charging cycles.

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

Prior to performing any maintenance or system modifications, exercise CAUTION to bleed off any stored system pressure by depressing the brake pedal several times.

VALVE GUARD VALVE CAP

PRESSURE GAUGE*

ADAPTER* ACCUMULATOR ASSEMBLY PART NO. 90254 INCLUDES PARTS SHOWN * ACCU-2

CHARGING AND TESTING DEVICE

CHARGING THE ACCUMULATOR WARNING: USE ONLY NITROGEN for charging accumulators, NEVER USE OXYGEN OR AIR, due to the risk of explosion.

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.

GAS VALVE

• Remove the valve guard and cap.

BODY

• Screw the charging and testing device onto the gas valve.

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

BLADDER

HYDRAULIC CONNECTION ACCU-1

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

POPPET (Seats against oil port after oil evacuation)

• If the pre-charge pressure is too high, it may be reduced by opening the drain valve and carefully depressing the button on the charging device.

ACCUMULATOR (BLADDER TYPE)

CHECKING THE GAS PRE-CHARGE PRESSURE

Note: The pre-charge pressure will vary dependant upon the temperature. Once the desired precharge is reached, wait two minutes for the gas temperature to equalize. Re-check pre-charge and adjust if necessary.

Bleed off the system pressure as stated earlier.

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

• Disconnect hose from nitrogen bottle.

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

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

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

• Check to ensure their are no leaks, if gas valve is leaking, it should be replaced. Use only valves approved for accumulator service. NEVER USE AN AUTOMOTIVE TYPE VALVE.

WARNING: The accumulator must not be altered.

DO NOT weld or machine the pressure vessel.

_________________________________________

9.4

Tigercat 726 Feller Buncher

Brakes

PILOT MANIFOLD

Oil is directed from the pilot manifold to the rear axle brakes via a second (P1) port, bypassing the pressure reducing valve and relief valve.

The pilot manifold supplies pilot oil to the following circuits: System pressure Un-reduced: • Rear axle brakes (P1) Reduced pressure for: • Boom joystick (P2) • Clamps foot control (P2) • Rear axle diff. locks (C1) Sol. valve • Front axle diff. locks (C2) Sol. valve • Accum. arms close (C3) Sol. valve (Later machs) • Accum. arms open (C4) Sol. valve (Later machs) • Creep (C5) Sol. valve

PRESSURE REDUCING VALVE

Pilot oil to the five solenoid pilot valves, the clamps foot control and the joystick first passes thru' the PRESSURE REDUCING VALVE. The PRESSURE REDUCING VALVE reduces and maintains the pilot pressure on the outlet side of the pilot manifold to a pre-set value. The RELIEF VALVE, located down stream from, and set higher than the PRESSURE REDUCING VALVE diverts pilot oil back to tank in the event that the reducing valve fails to limit the down stream pressure.

To adjust the PRESSURE REDUCING VALVE and the RELIEF VALVE loosen the jamnut and screw out (counter-clockwise) the adjusting screw to lower the pressure value or screw in the adjusting screw (clockwise) to raise the pressure value. Re-tighten jamnut.

5-SOLENOID VALVES

RELIEF VALVE

(P1) TO BRAKES 25-11AB

(P1) FROM ACCUM.

PILOT MANIFOLD

TO BRAKE FOOT CONTROL

GAUGE TEST PORT (P2)

TO DIFF. LOCK REAR

The five solenoid valves control the position of the spool valves or pistons to which they are hydraulically

TO DIFF. LOCK FRONT

IN FROM ACCUM. P1

P1

For complete pressure setting instructions, refer to PILOT PRESSURE SETTINGS.

C1

P1

TO ACCUM. ARMS

TO ACCUM. ARMS

IN

C3 P2

FROM CLAMPS FOOT CONTROL

TO JOYSTICK

GAUGE TEST PORT

C2

TO DRIVE MOTOR (CREEP)

C4

P2

C5

P2

SM-15

PRESS. REDUCING VALVE 550PSI

T RELIEF VALVE 675 PSI

PILOT MANIFOLD SCHEMATIC

TO TANK

connected. When a solenoid valve is energized, usually by a switch in the cab, its spool is shifted and pilot oil is directed to one end of a spool valve or piston.

OPERATING DESCRIPTION The pilot manifold consists of a one piece manifold block into which a PRESSURE REDUCING VALVE and a PRESSURE RELIEF VALVE are installed.

Five SOLENOID OPERATED CONTROL VALVES are installed in outlet ports C1 thru' C5. A quick disconnect test port fitting is installed in port P2 to attach a pressure gauge during set-up procedures.

When the solenoid is de-energized, a spring forces the spool back to the neutral position, blocking the pressure side and opening the pilot line back to tank.

There are no adjustments on the solenoid valves. _________________________________________

Oil is supplied to the pilot manifold (Port P1) from the Steer pump via the Brake accumulator charge valve and the accumulator. The accumulator provides a constant pressure source for the pilot controls and the rear axle brakes.

9.5

Tigercat 726 Feller Buncher

Brakes

BRAKE/DIFFERENTIAL LOCK 2.

BRAKES CIRCUIT DESCRIPTION A fixed displacement pump supplies oil to the brake accumulator charge valve. This valve directs oil to both the steering circuit and the pilot manifold. The pilot manifold supplies oil to the brakes foot pedal from a 'P1' port in the manifold up stream from the pressure reducing valve. The pedal, in addition to directing oil to the brakes in the rear axle, regulates the pressure in the line to a preset value of 1000 psi max.

3.

4.

DIFFERENTIAL LOCK CIRCUIT DESCRIPTION

5.

The differential locks in both front and rear axles are controlled by two switches located on the control panel in the cab. The switches control two solenoid pilot valves in ports 'C1' and 'C2' of the pilot maniflod.

Placing the switch(s) in the ON position energizes the solenoid pilot valves which direct pilot oil to the differential lock clutch packs in one or both axles to lock the differentials.

6.

7.

8.

PILOT PRESSURE SETTINGS

9.

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

10.

1.

several times before disconnecting any hydraulic lines.

Connect a 0-1500 psi pressure gauge to port P2 of the pilot manifold. The pilot manifold is located under the cab, behind the panel by the air intake doors. NOTE: Port P2 has a quick connect fitting installed. The part number for the fitting is AX005 (CATERPILLAR NO. 6V3965). The coupler that mates with the above fitting is AX006 (CATERPILLAR NO. 6V4144).

Ensure that the hydraulic oil temperature is between 100°F and 140°F. Turn the pressure reducing valve adjusting screw all the way in.

Turn the relief valve adjusting screw out (counter-clockwise) until the spring tension is completely relieved, then turn adjusting screw in (clockwise) one full turn.

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

Adjust the relief valve pressure to 675 psi.

Adjust the pressure reducing valve pressure to 550 psi.

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

Remove all pressure gauges and reinstall all plugs and caps.

NOTES: 1. No pressure adjustments are required for the brake accumulator charge valve.

2. The accumulator comes precharged to 700 psi.

Park machine on level ground, stop engine, set parking brake ON and block wheels.

WARNING: The brake circuit is under pressure even when the machine is not running. Release the pressure by depressing the brake pedal

REAR DIFF. LOCK PILOT VALVE

FRONT DIFF. LOCK PILOT VALVE

PRESS. REDUCING VALVE (550 psi) - 3/4" WRENCH - 3/16" ALLEN KEY RELIEF VALVE (675 psi) - 3/4" WRENCH - 3/16" ALLEN KEY GAUGE TEST PORT 'P2'

TO BRAKE PILOT VALVE (FOOT PEDAL) 25-11A

FROM ACCUMULATOR

PILOT MANIFOLD 9.6

Tigercat 726 Feller Buncher

SM01

Brakes

BRAKE/DIFFERENTIAL LOCK CIRCUIT 9.7

Tigercat 726 Feller Buncher

Brakes

PARKING BRAKE A parking brake lever is located in the cab to the left of the drivers seat. It is connected to a disk brake caliper assembly mounted on the front axle output shaft of the transmission by a cable.

Pulling up on the parking brake lever applies the brake. Pushing down on lever releases the brake.

Spring force in the caliper assembly holds the brake pads away from the disk.

There are two ways to adjust the parking brake to compensate for wear; (1) Turning the knob on the ADJUSTING KNOB

21-2A

end of the brake lever or, (2) at the caliper by loosening the jamnut on the cable clevis, removing the clevis and screwing the clevis further onto the cable end.

The brake is correctly adjusted when resistance is encountered half way through the brake lever's free travel.

A limit switch (drive prevent circuit) is attached to the brake lever housing. When the brake lever is in the ON position a pin on the lever CLOSES the limit switch contacts. When the lever is in the fully OFF position the contacts are OPEN. This circuit prevents the machine from being driven when the parking brake is ON.

9.8

Tigercat 726 Feller Buncher

SECTION 11 - STEERING JULY 95

CONTENTS - SECTION 11 PRESSURE SETTINGS ................................ 11.5 PUMP DESCRIPTION ................................... 11.2 RELIEF VALVES MAIN .......................................................... 11.4 PORT (CARTRIDGE). See SECTION 4 SCHEMATIC DIAGRAM ................................ 11.6 STEER CIRCUIT DESCRIPTION .................. 11.5 STEER CONTROL VALVE ............................ 11.3 OPERATING DESCRIPTION .................... 11.3 STEER RELIEF VALVE ................................. 11.4 STEERING LINKAGE BELOW CAB .............. 11.3

Tigercat 726 Feller Buncher

Steering

STEER/BOOM PUMP Vickers

CARTRIDGE ROTATION (L.H. OR R.H.)

A double vane pump is mounted to the lower left of the pump drive gearbox. The pump drive shaft is connected to the gearbox via a splined adapter. The output from the shaft end vane pump section supplies hydraulic oil for the boom and clamp functions. The cover end section supplies hydraulic oil for the COVER END CARTRIDGE

The shaft rotation for this installation is L.H. (C.C.W.) when viewed from the shaft end.

The sharp edge of the vanes in the cartridges must always lead the direction of rotation. Therefore, if it becomes necessary to change the direction of rotation of the pump, the following procedure should be used: Disassemble pump and remove both cartridges.

SHAFT END CARTRIDGE

Remove the (2) screws holding the cartridge together.

Take the two outer pieces that sandwich the cartridge together (inner support plate and outer support plate) and reverse their locations.

Reinstall the two screws hand tight.

SHARP EDGE OF VANE MUST LEAD DIRECTION OF ROTATION

VANE-3A

LH

RH

LH

RH

RH

LH

RH

LH

CROSS SECTION OF DOUBLE VANE PUMP steering, brake, differential lock functions and most pilot circuits. This pump requires no adjustments, relief valves are located either in the line or on the control valve.

LOOKING AT "INNER LOOKING AT "INNER SUPPORT PLATE" OF SUPPORT PLATE" OF COVER END CARTRIDGE SHAFT END CARTRIDGE RH ROTATION SHOWN RH ROTATION SHOWN

Using pump cover to align all cartridge kit components, feed the loosely assembled cartridge into the pump cover with the inner and outer support plates entering the cover in the same way as when they were removed.

Remove cover carefully and tighten screws to recommended torque. Refer to parts catalog for torque values.

Follow this procedure for both cartridges.

Reassemble pump.

• VANE-1

_________________________________________

CAM RING WALL

Fluid flow is developed in each pump section by a rotating cartridge which consists of a cam ring, rotor, ten vanes, side plates and support plates.

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

11.2

Tigercat 726 Feller Buncher

Steering

STEER CONTROL VALVE This is a manually operated open center spool type directional control valve. The steering wheel is connected to the steer valve by a linkage system.

The steer pump supplies oil to this valve via port 'O' of the accumulator charge valve.

Steering speed can be controlled by turning the steering wheel either PARTIALLY for slower response or FULLY for faster response.

Relief valves are installed on both ports of the steer valve to prevent over pressurizing of the steer cylinders.

Continued on page 4

OPERATING DESCRIPTION This control valve has a self centering 3-position spool. A spring in the spool end cap holds the spool in the center position. This spring also causes the steering wheel to self center when released. In this position oil flow passes through the control valve, and is returned to tank.

CONNECTING ROD

PORT RELIEF VALVES

Pushing the spool IN (turning left) pressurizes port 'B' and allows port 'A' to direct the return oil to tank.

Pulling the spool OUT (turning right) pressurizes port 'A'. and allows port 'B' to direct the return oil to tank.

These ports direct oil flow to either end of the steer cylinders to turn the machine in the desired direction.

B A SPOOL SECTION OUTLET SECTION

STEERING CONTROL VALVE

PHOT-6

LOAD CHECK VALVE

INLET SECTION

B

PARALLEL PASSAGE

WORK PORT BRIDGE

RELIEF VALVE PORT 'A'

RELIEF VALVE PORT 'B' B

A P

SM-18

SPOOL

SPOOL CENTERING SPRING THRU' NEUTRAL PASSAGE

TANK PASSAGE

STEERING VALVE CROSS SECTION

90506

STEERING SHAFT BRG. BELOW CAB

STR-1

A

CONNECTING ROD TO STEERING SHAFT

CONNECTING ROD TO VALVE

STEERING LINKAGE BELOW CAB

PHOT-19

11.3

STEERING CONTROL VALVE

T

Tigercat 726 Feller Buncher

Steering

Continued from page 3

A steer circuit MAIN RELIEF VALVE, set lower than the port relief valves, is installed in the line between the pump supply and the accumulator charge valve.

This protects the system by preventing the system pressure from getting higher than the preset value, Higher system pressures will cause the main relief valve to direct oil back to tank.

ADJUSTING SCREW LOCKNUT

TANK PORT

PRESSURE PORT RELIEF RPGC

CARTRIDGE

GAUGE TEST PORT

25-17A

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

The valve is adjusted by loosening the locknut and turning the hex head screw. Turning the hex head screw clockwise increases the pressure setting and counter-clockwise decreases the pressure setting.

Once the pressure is set correctly, tighten the locknut and re-check the pressure setting.

Provision has been made in the base of this valve to connect a pressure gauge. The connection size is -04 JIC and is a 90° capped elbow. _________________________________________

11.4

Tigercat 726 Feller Buncher

Steering 8.

STEER HYDRAULIC CIRCUIT CIRCUIT DESCRIPTION Two steer cylinders are used to steer the machine. Oil is supplied from a fixed displacement pump via a brake accumulator charge valve to the steer valve. The steer valve controls the flow of oil to and from the steering cylinders.

PRESSURE SETTINGS WARNING: To prevent injury caused by accidental steering of the machine when setting pressures, Make sure the Articulation lock pin is held securely in place by the lynch pins provided.

1.

Park machine on level ground, stop engine, set parking brake ON and block wheels.

2.

Install articulation lock pin.

3.

Install a 0-5000 psi pressure gauge to the gauge test port in the base of the steer relief valve. The steer relief valve is located at the rear of the machine, on the left side by the hydraulic reservoir.

4.

Turn the steer main relief adjusting screw all the way in.

5.

Turn both port relief adjusting screws on steer valve out until spring pressure is relieved. The steer control valve is located in the rear chassis below the cab and behind the panel by the air intake doors.

6.

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

7.

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

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

IMPORTANT: When setting port relief valves do not allow oil to blow over relief for more than 5 seconds at a time to avoid pump damage.

9.

Move the throttle control to the FULL position.

10.

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

11.

Remove pressure gauge and reinstall plugs and caps.

12.

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

_______________________________________ MAIN RELIEF (2500 psi) ADJUSTING SCREW - 1/2" WRENCH - 9/16" WRENCH

25-17A

GAUGE TEST PORT - 04 JIC

STEER MAIN RELIEF PORT RELIEF VALVE 'B' (3200 psi) - 11/16" WRENCH - SLOT SCREW DRIVER

PORT RELIEF VALVE 'A' (3200 PSI)

ACTUATING LEVER

25-23A

STEER CONTROL VALVE 11.5

Tigercat 726 Feller Buncher

SM11

Steering

STEER CIRCUIT 11.6

Tigercat 726 Feller Buncher

SECTION 12 - LIFT BOOM OCTOBER 1996

CONTENTS - SECTION 12 BOOM CONTROL VALVE DESCRIPTION SERIAL NO. 7260101 TO 7260441 ........... 12.4 SERIAL NO. 7260542 AND UP .................. 12.3 JOYSTICK CONTROL VALVE ...................... 12.2 LIFT CIRCUIT DESCRIPTION ...................... 12.4 LIFT CIRCUIT SCHEMATIC SERIAL NO. 7260101 TO 7260441 ........... 12.6 SERIAL NO. 7260542 AND UP .................. 12.7 PRESSURE SETTINGS ................................ 12.4 PUMP, DESCRIPTION BOOM, CLAMPS & STEER. See SECTION 11 RELIEF VALVE, PORT. See SECTION 4

Tigercat 726 Feller Buncher

Lift boom

JOYSTICK CONTROL VALVE

OPERATING DESCRIPTION

LIFT BOOM AND CLAMPS

In the neutral position the joystick lever is held centered by return springs (4).

This pilot valve is a manually operated directional control valve and operates on the same principal as a direct operating pressure reducing valve. Both the joystick and foot control valves use similar spool arrangements. Operated by hand this valve directs pilot pressure to the main control valve pilot end caps. The corresponding spool valve then shift from its centre position and directs pump flow to operate a cylinder.

When the lever (1) is operated, the plunger (5) is pushed against it's 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.

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

T

P

WORK PORTS 1, 2, 3 OR 4

RR-11

SPOOL ARRANGEMENT

RR-12

12.2

JOYSTICK PILOT VALVE

Tigercat 726 Feller Buncher

Lift boom

BOOM CONTROL VALVE

GAUGE TEST PORT

LIFT SECTION

Serial No. 7260542 and up The boom valve consists of four open center spool sections and one mid inlet section. A fifth spool section is installed along with one end inlet section to control the shear. Each spool section is pilot operated. An outlet section directs return oil back to tank.

PORT RELIEF MID. INLET SECTION

Oil enters the mid. inlet section and is allowed to pass through the four spool sections and back to tank via the outlet section. Each of the spool sections has a self centering 3-position spool which is open centered. A spring in the spool end cap holds the spool in the center neutral position. The spool is shifted by pilot pressure being applied to either end of the spool. Shifting the spool directs oil to operate any one of the four fuctions.(or all at the same time if required but with reduced flow to each).

MAIN RELIEF

726VLV

BOOM CONTROL VALVE (WITH SAW) Serial No. 7260542 and up

SAW INLET SECTION

OUTLET SECTION

NOTE: Re. Clamps: Holding the clamp foot pedal down after the clamp cylinders are fully closed will not increase the clamping force on the trees.

UP PORT RELIEF

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

DOWN PORT RELIEF

LIFT

A MAIN RELIEF VALVE is installed in both the mid inlet section and the saw inlet section of the valve.

The mid inlet main relief valve controls the lift spool section and is set lower than the lift up port relief valve. All relief valves are the same type (anticavitation relief valve), although there is an early and later design in use. For a detailed description of these relief valves, refer to RELIEF VALVES in SECTION 4 of this manual.

MID. INLET SECTION

MAIN RELIEF

INLET SECTION

AT023L1

BOOM CONTROL VALVE (WITH SAW) Serial No. 7260542 and up

Continued on page 4 RELIEF VALVE PORT 'A'

PARALLEL PASSAGE

LOAD CHECK VALVE

A

WORK PORT BRIDGE

RELIEF VALVE PORT 'B'

B

PILOT END CAP PILOT END CAP 90136-3

SPOOL CENTERING SPRING

SPOOL TANK PASSAGE

THRU' NEUTRAL PASSAGE

CROSS SECTION OF SPOOL SECTIONS 12.3

Tigercat 726 Feller Buncher

Lift boom

Continued from page 3

PRESSURE SETTINGS

Serial No. 7260101 to 7260441

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

The boom valve used on earlier machines operates in the same way as the later style but does not have the saw section or the mid inlet section. The LIFT and TILT functions have also changed places with each other.

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

Completely raise lift boom and place lock over one of the two cylinder rods with the open side at the bottom and wide end up against the keeper plate bolt heads. Install retaining bolt and locknut through center hole. Slowly lower boom until lock is securely held in place.

LIFT HYDRAULIC CIRCUIT CIRCUIT DESCRIPTION NOTE: There are basically two variations of the boom valve in use, an earlier style without the saw control portion and a later design with the saw control. Which ever valve arrangement is used, the following circuit description and pressure setting procedures will apply.

DO NOT use this devise to block the boom when setting the boom down port relief, it is not designed to withstand high forces created by the hydraulic system.

WARNING: 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 boom pump.

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

Two cylinders are used to raise and lower the felling head. The cylinders receive oil from a fixed displacement pump via the lift spool section in the boom control valve. The spool section in this control valve is pilot operated at both ends. It receives pilot oil from the joystick control valve in the operator's cab to shift the spool. The spool directs oil from the pump to either end of the cylinders and from the cylinders back to tank via the oil cooler.

*Refer to RELIEF VALVE ADJUSTING PROCEDURE in SECTION 4 of this manual.

1. Park machine on level ground, stop engine, set parking brake ON and block wheels.

2. Connect a 0 - 5000 p.s.i. pressure gauge (with at least 4' of hose) to the boom valve test port.

NOTE: Use the test port on the elbow at the mid.

Continued on page 5 GAUGE TEST PORT 04 JIC

MAIN RELIEF (2600 psi) - 1 " WRENCH (LATER DESIGN) - 11/16" WRENCH - SLOT SCREW DRIVER (EARLIER DESIGN-SHOWN)

B

TILT

B ACCUM

A

A

B CLAMP A

B

LIFT

A

LIFT 'UP' PORT RELIEF (2900 psi)

LIFT 'DOWN' PORT RELIEF (2200 psi)

'LIFT' SPOOL SECTION AT001

LIFT BOOM CONTROL VALVE Serial No. 7260101 to 7260441 12.4

Tigercat 726 Feller Buncher

Lift boom WARNING: Do not stand on top of or inside boom arms.

Continued from page 4

inlet section on valves with a saw spool section attached. On earlier machines without the saw valve section, use the test port on the end inlet section.

If less than 2200 psi., release pressure in rod end of lift cylinders and allow felling head to sit on the ground. Stop engine and readjust lift down port relief. Repeat above procedure until a gauge reading of 2200 psi is obtained.

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

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

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

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

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

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

WARNING: Do not stand on top of or inside boom arms.

WARNING: Do not stand under boom and felling head.

If less than 2600 psi., release pressure in rod end of lift cylinders and allow felling head to sit on the ground. Stop engine and readjust main relief.

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

If less than 2900 psi., lower felling head to the ground, stop engine and readjust lift up port relief. Repeat above procedure until a gauge reading of 2900 psi is obtained.

IMPORTANT: Approach the gauge reading slowly and deliberately by turning adjusting screw IN a little at a time. The pressure setting must not exceed the above value.

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

11. Remove pressure gauge and reinstall plugs and caps.

SET PILOT LINE PRESSURES

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

LIFT 'UP' PORT RELIEF (2900 psi) GAUGE TEST PORT (IN ELBOW) 04 JIC MID. INLET SECTION

AT023L1

NOTE: To set the pilot line pressure refer to BRAKES - SECTION 9 in this manual.

LIFT 'DOWN' PORT RELIEF (2200 psi)

•

•

LIFT •

•

•

MAIN RELIEF (2600 psi) - 1 " WRENCH (LATER DESIGN - SHOWN) - 11/16" WRENCH - SLOT SCREW DRIVER (EARLIER DESIGN)

LIFT BOOM CONTROL VALVE (WITH SAW) Serial No. 7260542 and up 12.5

Tigercat 726 Feller Buncher

Lift boom

LIFT CIRCUIT SM08

SERIAL NUMBER 7260101 TO 7260441 12.6

Tigercat 726 Feller Buncher

Lift boom

LIFT CIRCUIT SM42

SERIAL NUMBER 7260542 AND UP 12.7

Tigercat 726 Feller Buncher

Lift boom

12.8

Tigercat 726 Feller Buncher

SECTION 13 - TILT JULY 95

CONTENTS - SECTION 13 BOOM CONTROL VALVE DESCRIPTION ... 13.2 JOYSTICK PILOT VALVE. SEE SECTION 12 PRESSURE SETTINGS ................................ 13.2 PUMP, DESCRIPTION BOOM, CLAMPS & STEER. See SECTION 11 RELIEF VALVE, PORT. SEE SECTION 4 TILT CIRCUIT DESCRIPTION ...................... 13.2 TILT CIRCUIT SCHEMATIC SERIAL NO. 7260101 TO 7260441 ........... 13.4 SERIAL NO. 7260542 AND UP .................. 13.5

Tigercat 726 Feller Buncher

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

BOOM CONTROL VALVE For a complete description of the boom control valve refer to SECTION 12 in this manual.

Completely raise lift boom and place lock over one of the two cylinder rods with the open side at the bottom and wide end up against the keeper plate bolt heads. Install retaining bolt and locknut through center hole. Slowly lower boom until lock is securely held in place.

TILT HYDRAULIC CIRCUIT CIRCUIT DESCRIPTION NOTE: There are basically two variations of the boom valve in use, an earlier style without the saw control portion and a later design with the saw control. Which ever valve arrangement is used, the following circuit description and pressure setting procedures will apply.

DO NOT use this devise to block the boom when setting the boom down port relief, it is not designed to withstand high forces created by the hydraulic system.

WARNING: 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 boom pump.

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

Two cylinders are used to tilt the felling head forward and back. The cylinders receive oil from a fixed displacement pump via the tilt spool section in the boom control valve. The spool section in this control valve is pilot operated at both ends. It receives pilot oil from the joystick control valve in the operator's cab to shift the spool. The spool directs oil from the pump to either end of the cylinders and from the cylinders back to tank via the oil cooler.

*Refer to RELIEF VALVE ADJUSTING PROCEDURE in SECTION 4 of this manual.

1. Park machine on level ground, stop engine, set parking brake ON and block wheels.

2. Connect a 0 - 5000 p.s.i. pressure gauge (with at least 4' of hose) to the boom control valve test port.

NOTE: Use the test port on the elbow at the mid. inlet section on valves with a saw spool section attached. On earlier machines without the saw valve section, use the test port on the end inlet section.

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

Continued on page 3 MAIN RELIEF (2600 psi) - 1 " WRENCH (LATER DESIGN) - 11/16" WRENCH - SLOT SCREW DRIVER (EARLIER DESIGN - SHOWN) TILT 'OUT' PORT RELIEF (2900 psi) 'TILT' SPOOL SECTION

AT001

•

GAUGE TEST PORT 04 JIC

• •

•

B

TILT

INLET SECTION

A

•

• B ACCUM A

B

CLAMP

A

B

LIFT

A

TILT BOOM CONTROL VALVE Serial No. 7260101 to 7260441 and up 13.2

TILT 'IN' PORT RELIEF (2900 psi)

Tigercat 726 Feller Buncher

Tilt

Continued from page 2

If less than 2900 psi., lower felling head to the ground. Stop engine and readjust tilt in port relief. Repeat above procedure until a gauge reading of 2900 psi is obtained.

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

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

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

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

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

10. Raise felling head off the ground and while holding the joystick in the TILT IN position, check gauge pressure reading.

6. Raise felling head off the ground and while holding the joystick in the TILT OUT position (fully extended), check gauge pressure reading.

WARNING: Do not stand on top of or inside boom arms.

WARNING: Do not stand on top of or inside boom arms.

If less than 2600 psi., lower felling head to the ground. Stop engine and readjust main relief.

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

If less than 2900 psi., lower felling head to the ground, stop engine and readjust tilt out port relief. Repeat above procedure until a gauge reading of 2900 psi is obtained.

11. Remove pressure gauge and reinstall plugs and caps.

IMPORTANT: Approach the gauge reading slowly and deliberately by turning adjusting screw IN a little at a time. The pressure setting must not exceed the above value.

SET PILOT LINE PRESSURES

7. Raise felling head off the ground and while holding the joystick in the TILT IN position (fully retracted), check gauge pressure reading.

WARNING: Do not stand on top of or inside boom arms.

NOTE: To set the pilot line pressure refer to BRAKES - SECTION 9 in this manual.

'TILT' SPOOL SECTION TILT 'IN' PORT RELIEF (2900 psi)

MID. INLET SECTION

•

•

•

•

•

GAUGE TEST PORT (IN ELBOW) 04 JIC

AT023T1

•

TILT

TILT 'OUT' PORT RELIEF (2900 psi)

MAIN RELIEF (2600 psi) - 1 " WRENCH (LATER DESIGN - SHOWN) - 11/16" WRENCH - SLOT SCREW DRIVER (EARLIER DESIGN)

TILT BOOM CONTROL VALVE (WITH SAW) Serial No. 7260542 and up 13.3

Tigercat 726 Feller Buncher

Tilt

TILT CIRCUIT SM12

SERIAL NUMBER 7260101 TO 6260441 13.4

Tigercat 726 Feller Buncher

Tilt

TILT CIRCUIT SM43

SERIAL NUMBER 7260542 AND UP 13.5

Tigercat 726 Feller Buncher

Tilt

13.6

Tigercat 726 Feller Buncher

SECTION 17 - SAW DRIVE JULY95

CONTENTS - SECTION 17 CONTROL VALVE, SAW OPERATING DESCRIPTION S/N 7260101 TO 7260441 ...................... 17.2 S/N 7260542 AND UP ............................ 17.6 FELLING HEAD, 20" SAW. SEE ORIGINAL MANUFACTURERS MANUAL PRESSURE SETTINGS S/N 7260101 TO 7260441 ......................... 17.4 S/N 7260542 AND UP ................................ 17.8 SAW CIRCUIT DESCRIPTION S/N 7260101 TO 7260441 ......................... 17.2 S/N 7260542 AND UP ................................ 17.6 SAW CIRCUIT SCHEMATIC S/N 7260101 TO 7260441 ......................... 17.5 S/N 7260542 AND UP ................................ 17.9

Tigercat 726 Feller Buncher

Saw drive The PILOT OPERATED RELIEF VALVE is included to protect the pump in case of failure of the P.O.R. valve on the pump. Oil is diverted to tank via the 'TANK' port.

SAW CONTROL VALVE Serial Number 7260101 to 7260441 OUT

COMP SOL. VALVE

TEST PORT G1

The RELIEF VALVE is adjusted by loosening the locknut and turning the adjusting screw clockwise to increase the pressure value and counter-clockwise to decrease the value. It must be set at least 400 psi higher than the P.O.R. setting on the pump.

DR CHECK VALVE RELIEF VALVE

TEST PORT G2

SM-22

IN

ADJUSTING SCREW

RELIEF VALVE

TEST PORT G1

• VALVE BODY DIN CONNECTOR •

•

• •

Two gauge test ports (G1) and (G2) are provided for attaching pressure gauges when checking pressures.

T

________________________________________

SAW CIRCUIT DESCRIPTION CHECK VALVE

•

For a complete description of the circuit and pressure setting instructions, refer to PRESSURE SETTINGS: PUMP AND SAW CONTROL VALVE.

•

SOLENOID OPERATED • 11K CONTROL VALVE TEST PORT G2 SOLENOID TEST SAW CONTROL VALVE BUTTON Serial Number 7260101 to 7260441

The saw control valve consists of a steel body into which are housed a solenoid operated control valve cartridge, a relief valve cartridge and a pilot operated check valve.

Serial No. 7260101 to 7260441 The saw blade is driven by a variable displacement hydraulic motor (axial piston, bent axis) which is mounted directly above the saw blade and coupled to the saw blade through a drive shaft. A variable displacement hydraulic pump mounted on the pump drive gearbox supplies oil flow to the motor via the saw control valve. The saw control valve is solenoid operated with a built in relief and controls the flow of hydraulic oil from the pump to the motor.

NOTE: A red SOLENOID MANUAL TEST BUTTON on the end of the solenoid valve can be used to shift the valve spool by hand for trouble shooting purposes.

The saw valve controls the flow of oil from the saw pump to the saw motor.

OPERATING DESCRIPTION When the SOLENOID VALVE is de-energized (saw switch in OFF position), oil entering the 'IN' port is blocked by the CHECK VALVE preventing flow to the saw motor.

GAUGE TEST PORT G1 - 04 JIC

When the SOLENOID VALVE is energized, (saw switch ON) the spool in the control valve shifts and: (1) Allows system pressure to reach the back side of the PILOT OPERATED CHECK VALVE. This pressure, via internal porting, causes the CHECK VALVE to open and allow system pressure via the 'OUT' port to reach the saw motor.

(2) Transmits a pressure signal via the COMP. port to the saw pump causing it to provide flow to the saw motor.

For test purposes, a RED push button on the end of the solenoid valve can be used to operate the valve manually.

17.2

SOLENOID CONTROL VALVE

SOLENOID MANUAL TEST BUTTON

25-16A

RELIEF ADJUSTMENT (4200 psi) - 9/16" WRENCH - 5/32" ALLEN WRENCH

SAW CONTROL VALVE

Tigercat 726 Feller Buncher

Saw drive

The saw switch on the control panel in the cab is used to turn the saw ON or OFF. It is a 2 position switch controlling the flow of electrical current via a relay to the saw valve solenoid.

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

NOTE: The parking brake must be in the FULLY OFF position to run the saw.

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

IMPORTANT: To maximize pump and motor life, do not shut the engine off until the saw blade has come to a complete stop.

For explanation of saw motor, refer to saw head manufacturers manual.

With the saw switch in the OFF position, the saw valve solenoid is de-energized preventing oil flow to the motor. The oil is instead redirected, via internal ports in the pump, to the P.O.R. valve and the STAND-BY valve mounted on the back of the pump.

When pressure builds up to 300 p.s.i. the spool in the STAND-BY valve shifts to direct oil to the control piston of the pump swashplate, moving it to the neutral position. In this condition the pump flow is reduced to a minimum.

With the saw switch in the ON position, the saw valve solenoid is energized directing the flow of oil to unseat a PILOT OPERATED CHECK VALVE in the saw valve. This allows high pressure oil to flow from the pump to the motor.

Pilot oil is also directed from the saw valve back to the STAND-BY valve on the pump to prevent the STANDBY spool from shifting. This will override the 300 p.s.i. setting and allow the saw pump to build up pressure.

When the pressure (system pressure) builds up to 3600 p.s.i. the spool in the pump P.O.R. valve shifts to direct oil to the pump swashplate control piston.

The piston moves the swashplate to the near neutral position to cut back the flow of oil but maintain the pressure.

GAUGE TEST PORT G2 - 06 ORB

25-21A

SAW CONTROL VALVE (BOTTOM)

17.3

Continued on page 4

Tigercat 726 Feller Buncher

Saw drive

Continued from page 3

11.

Set the saw control valve relief pressure to 4200 psi.

12.

Set P.O.R. valve on pump to 3600 p.s.i.

13.

Remove all pressure gauges and reinstall all plugs and caps.

PRESSURE SETTINGS: Serial No. 7260101 to 7260441 PUMP AND SAW CONTROL VALVE 1.

Park machine on level ground, stop engine, set parking brake and block wheels.

2.

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

3.

Install 0 - 500 psi pressure gauge in port G2 of the saw control valve. The saw control valve is located at the rear of the machine, on the left side by the hydraulic reservoir.

4.

Start engine and measure stand-by pressure with saw switch in the OFF position. Gauge should read 300 psi, if not, adjust stand-by valve on the saw pump.

5.

Stop engine and remove the 0 - 500 psi pressure gauge from test port G2 and replace plug.

6.

Install a 0-5000 psi pressure gauge in the G1 test port of the saw control valve.

SAW PUMP (HOSES REMOVED FOR CLARITY)

PUMP BODY

P.O.R. VALVE (3600 psi) STAND-BY VALVE (300 psi)

25-22A

11/16" WRENCH 3mm ALLEN WRENCH

7.

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

8.

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

9.

Start the engine and put throttle control to the IDLE position. Ensure the hydraulic oil temperature is between 1000F and 1400F.

10.

Put the parking brake into the OFF position and turn the saw switch ON. NOTE: Saw will not operate if the parking brake is not FULLY OFF.

17.4

IMPORTANT: Saw relief valve must be set at least 400 psi above pump P.O.R. setting to avoid generation of excessive heat.

SET MOTOR P.O.R. (BEGIN OF STROKE) SET MOTOR MINIMUM DISPLACEMENT Refer to Felling Attachment manufacturers service literature for this information. _________________________________________

Tigercat 726 Feller Buncher

Saw drive

SAW CIRCUIT SM10

SERIAL NUMBER 7260101 TO 7260441

17.5

Tigercat 726 Feller Buncher

Saw drive

SAW CONTROL VALVES Serial Number 726542 and up The saw circuit is controlled by a solenoid operated pilot valve and a pilot operated main control valve.

The pilot valve consists of a steel body into which is housed a solenoid operated control valve cartridge.

SAW SPOOL SECTION TO GAUGE ON SIDESTAND

SAW INLET SECTION

The main saw valve is part of the boom valve. It consists of an open center spool section and an inlet section containing a relief valve.

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

An outlet section directs return oil back to tank via the oil cooler.

For boom valve description SEE SECTION 12 of this manual.

OPERATING DESCRIPTION

SAW RELIEF

726VLV

SAW/BOOM CONTROL VALVE Serial No. 7260542 and up

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

Pilot valve

•

OUTLET SECTION

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

SOLENOID

• SAW SPOOL SECTION

• DIN CONNECTOR

•

CONTROL VALVE CARTRIDGE

•

•

•

VALVE BODY

SAW END INLET SECTION GAUGE TEST PORT OR TO GAUGE ON SIDESTAND

•

AT023S1

•

SAW RELIEF (3900 psi) - 1 " WRENCH (LATER DESIGN - SHOWN) - 11/16" WRENCH - SLOT SCREW DRIVER (EARLIER DESIGN)

SAW/BOOM CONTROL VALVE Serial No. 7260542 and up

The saw spool section has a self centering 3-position spool which is open centered. A spring in the spool end cap holds the spool in the center neutral position.

SAW PILOT VALVE AT022

SAW

Serial Number 7260542 and up

The spool is shifted by pilot pressure being applied to one end of the spool from the pilot valve. Shifting the spool direct oil from the saw pump to the saw motor.

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

17.6

Tigercat 726 Feller Buncher

Saw drive PARALLEL PASSAGE

LOAD CHECK VALVE

A

PLUG

WORK PORT BRIDGE

B PLUG

PILOT END CAP PILOT END CAP 90136-4

SPOOL CENTERING SPRING

SPOOL TANK PASSAGE

THRU' NEUTRAL PASSAGE

CROSS SECTION OF SAW SPOOL SECTION

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

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

For a detailed description of both early and later design relief valves, refer to RELIEF VALVES in SECTION 4 of this manual.

Because the STAND-BY valve adjusting screw mounted on the back of the pump is screwed completely in, oil flow is blocked to the swashplate control piston leaving the pump set at maximum displacement. (unlike the earlier saw circuit)

SAW CIRCUIT DESCRIPTION Serial Number 7260542 and up The saw blade is driven by a variable displacement hydraulic motor (axial piston, bent axis) which is mounted directly above the saw blade and coupled to the saw blade through a drive shaft. A variable displacement hydraulic pump mounted on the pump drive gearbox supplies oil flow to the motor via the saw control valve. The main saw control valve is pilot operated and controls the flow of hydraulic oil from the pump to the motor. A relief valve is installed in the inlet section of the main saw control valve.

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

The saw switch on the control panel in the cab is used to turn the saw ON or OFF. It is a 2 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 pilot valve to shift the spool and direct pilot oil to one end of the spool section of the main saw control valve.

NOTE: The parking brake must be in the FULLY OFF position to run the saw.

IMPORTANT: To maximize pump and motor life, do not shut the engine off until the saw blade has come to a complete stop.

17.7

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

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

When the pressure (system pressure) builds up to 3600 p.s.i. the spool in the pump P.O.R. valve shifts to direct oil to the pump swashplate control piston.

The piston moves the swashplate to the near neutral position to cut back the flow of oil while at the same time maintaining the pressure and continuing to turn the blade.

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

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

For explanation of saw motor, refer to saw head manufacturers manual.

Continued on page 8

Tigercat 726 Feller Buncher

Saw drive

Continued from page 7

5.

PRESSURE SETTINGS: Serial No. 7260542 and up

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

SAW/BOOM CONTROL VALVE

PUMP AND SAW CONTROL VALVE 1.

Park machine on level ground, stop engine, set parking brake and block wheels.

2.

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

3.

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

Serial No. 7260542 and up SAW RELIEF (3900 psi) - 1 " WRENCH (LATER DESIGN - SHOWN) - 11/16" WRENCH - SLOT SCREW DRIVER (EARLIER DESIGN) SAW SPOOL SECTION TO GAUGE ON SIDESTAND

SAW PUMP Serial No. 7260542 and up

SAW PUMP

SAW INLET SECTION 726VLV

6.

•

¯CAUTION: Before starting engine, ensure relief valve is unscrewed as stated in paragraph 6 otherwise damage could occur to the piston pump.

GAUGE TEST PORT 04 JIC

7.

P.O.R. ADJUSTING SCREW

88-20A

Start the engine¯ and put throttle control to the IDLE position. Ensure the hydraulic oil temperature is between 1000F and 1400F.

••

Put the parking brake into the OFF position and turn the saw switch ON. NOTE: Saw will not operate if the parking brake is not FULLY OFF.

•

3a.

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

8.

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

4.

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

9.

Set P.O.R. valve on pump to 3600 p.s.i. (Gauge at rear of machine)

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

10.

Remove pressure gauge and reinstall all plugs and caps.

SAW PUMP

*Refer to RELIEF VALVE ADJUSTING PROCEDURE in SECTION 4 of this manual.

(HOSES REMOVED FOR CLARITY)

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

•

PUMP BODY

Refer to Attachment manufacturers OPERATOR AND MAINTENANCE MANUAL for this information.

• P.O.R. VALVE (3600 psi)

• • 25-22A

STAND-BY VALVE (SCREWED FULLY IN) 11/16" WRENCH 3mm ALLEN WRENCH

17.8

Tigercat 726 Feller Buncher

Saw drive

SAW CIRCUIT SM44

SERIAL NUMBER 7260542 AND UP

17.9

Tigercat 726 Feller Buncher

Saw drive

17.10

Tigercat 726 Feller Buncher

SECTION 18 - TREE CLAMPS JULY 95

CONTENTS - SECTION 18 CONTROL VALVE, MAIN. SEE SECTION 12 FOOT PEDAL CONTROL. SEE SECTION 8 PUMP, DESCRIPTION BOOM, CLAMPS & STEER. See SECTION 11 TREE CLAMPS WITH SAW: CIRCUIT DESCRIPTION ........................... 18.2 CIRCUIT SCHEMATIC SERIAL NO. 7260101 TO 7260441 ........ 18.5 SERIAL NO. 7260542 AND UP .............. 18.6 PRESSURE SETTINGS ............................ 18.3

Tigercat 726 Feller Buncher

Tree clamps

TREE CLAMPS ~ WITH SAW

CLAMP SECTION

Used on Koehring Waterous 20" Saw Head

GAUGE TEST PORT

CIRCUIT DESCRIPTION The upper and lower tree clamps are each operated by single cylinders operating independently of each other. The cylinders receive oil from a fixed displacement pump via two spool sections in the boom main control valve.

NOTE: There is an earlier and later type boom valve in use. On serial number 7260101 to 7260441 a valve without the saw drive section is used. On serial number 7260542 and up the saw main control valve is attached to the boom valve. Which ever valve is used, the following circuit description and pressure setting procedures will apply.

For a description of the pump refer to SECTION 11 of this manual.

For a description of the boom control valve and the joystick refer to SECTION 12 of this manual For a description of the foot pedal control refer to SECTION 8 of this manual.

The accumulating arms (lower clamps) are operated by a 3 position thumb switch OPEN/CLOSE (self centering to OFF) located on the joystick control lever. The switch operates two solenoid pilot valves which direct pilot oil to the accumulating spool section of the boom control valve, to shift the spool. The

UPPER CLAMP ARMS 'CLOSE' PORT RELIEF (3200 psi)

•

•

••

••

•• PORT RELIEFS

MAIN RELIEF

726VLV

BOOM CONTROL VALVE (WITH SAW) Serial No. 7260542 and up

The clamp arms (upper clamps) are operated by two foot pedals, one to OPEN the arms and one to CLOSE them. The foot pedals (a single 2 spool pilot valve) direct pilot oil to the clamps spool section of the boom control valve, to shift the spool. The spool directs oil from the pump to either end of the clamp arms cylinder to open or close the arms. Return oil is directed back to tank via the oil cooler. On some earlier machines the return oil did not pass through the oil cooler.

GAUGE TEST PORT 04 JIC

TILT

INLET SCTION

A

• B ACCUM A

•

B CLAMP A

•

B

LIFT

UPPER CLAMP ARMS SPOOL SECTION

AT001

•• ••

••

• B

•

MID. INLET SECTION

•

•

ACCUMULATING ARMS SPOOL SECTION ACCUM. ARMS 'CLOSE' PORT RELIEF (3200 psi)

ACCUM SECTION

spool directs oil from the pump to either end of the accumulating arms cylinder to open or close the arms.Return oil is directed back to tank via the oil cooler. On some earlier machines the return oil did not pass through the oil cooler.

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

MAIN RELIEF (2600 psi) - 1 " WRENCH (LATER DESIGN - SHOWN) - 11/16" WRENCH - SLOT SCREW DRIVER (EARLIER DESIGN)

••

UPPER CLAMP ARMS 'OPEN' PORT RELIEF (3200 psi)

A •

LIFT BOOM CONTROL VALVE Serial No. 7260101 to 7260441 18.2

ACCUM. ARMS 'OPEN' PORT RELIEF (3200 psi)

OUTLET SECTION

Tigercat 726 Feller Buncher

Tree clamps in.

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

5.

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

6.

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

WARNING: 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 boom pump.

IMPORTANT: During the following procedures, DO NOT hold thumb switch in this position for longer than 5 seconds.

NOTE: There is an early and later style relief valve used on the boom control valve. Refer to RELIEF VALVE ADJUSTING PROCEDURE in SECTION 4 of this manual.

1.

Park machine on level ground, stop engine, set parking brake ON and block wheels.

2.

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

NOTE: Use the test port on the elbow at the mid. inlet section on valves with a saw drive spool section attached. On earlier machines without the saw drive valve section, use the test port on the end inlet section.

3.

4.

WARNING: Do not stand on top of or inside boom arms.

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

IMPORTANT: Approach the gauge reading slowly and deliberately by turning adjusting screw in a little at a time. The pressure setting must not exceed the above value.

7.

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

Turn the port relief valve adjusting screws on both the accumulating and clamps spool section of the control valve out until spring pressure is relieved then turn adjusting screws one full turn

While holding the joystick thumb switch in the ACCUMULATING ARMS OPEN position (fully retracted), check gauge pressure reading.

WARNING: Do not stand on top of or inside boom arms.

If less than 3200 psi., stop engine and readjust Continued on page 4

OUTLET SECTION

•

UPPER CLAMP ARMS 'CLOSE' PORT RELIEF (3200 psi)

•

CLAMP

•

ACCUM. ARMS 'CLOSE' PORT RELIEF (3200 psi)

•

ACCUM

•

GAUGE TEST PORT (IN ELBOW) 04 JIC MID. INLET SECTION

AT023AC1

•

UPPER CLAMP ARMS 'OPEN' PORT RELIEF (1100 psi) ACCUM. ARMS 'OPEN' PORT RELIEF (3200 psi)

•

•

MAIN RELIEF (2600 psi) - 1 " WRENCH (LATER DESIGN - SHOWN) - 11/16" WRENCH - SLOT SCREW DRIVER (EARLIER DESIGN)

LIFT BOOM CONTROL VALVE (WITH SAW) Serial No. 7260542 and up 18.3

Tigercat 726 Feller Buncher

Tree clamps

Continued from page 3

accumulating arms open port relief. Repeat above procedure until a gauge reading of 3200 psi is obtained.

8.

While depressing the CLAMPS CLOSE foot pedal (cylinder fully extended), check gauge pressure reading.

WARNING: Do not stand on top of or inside boom arms.

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

9.

While depressing the CLAMPS OPEN foot pedal (cylinder fully retracted), check gauge pressure reading.

WARNING: Do not stand on top of or inside boom arms.

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

10.

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

11.

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

12.

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

WARNING: Do not stand on top of or inside boom arms.

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

13.

Remove pressure gauge and reinstall plugs and caps.

SET PILOT LINE PRESSURES NOTE: To set the pilot line pressure refer to BRAKES - SECTION 9 in this book.

_________________________________________

18.4

Tigercat 726 Feller Buncher

Tree clamps

ACCUMULATING AND CLAMP ARMS CIRCUIT SM 03

SERIAL NUMBER 7260101 TO 7260441 18.5

Tigercat 726 Feller Buncher

Tree clamps

ACCUMULATING AND CLAMP ARMS CIRCUIT (20" SAW HEAD) SM45

SERIAL NUMBER 7260542 AND UP 18.6