Tigercat 720C FELLER BUNCHER Service Manual - PDF DOWNLOAD

SERVICE MANUAL Tigercat 720C FELLER BUNCHER ISSUE 1.1, MARCH 2003

TABLE OF CONTENTS SECTION INTRODUCTION .............................................................................................................. iii SAFETY ............................................................................................................................ 1 USING HIGH SPEED DISC SAWS SAFELY ........................... APPENDIX TO SECTION 1 CONTROLS AND OPERATION .......................................... SEE OPERATOR'S MANUAL LUBRICATION AND MAINTENANCE ............................................................................... 3 PILOT SYSTEM ................................................................................................................ 5 ELECTRICAL, GAUGES AND ALARMS ........................................................................... 6 ENGINE............................................................................................................................. 7 DRIVE ............................................................................................................................... 8 BRAKES AND DIFFERENTIAL LOCKS ............................................................................ 9 OIL COOLER .................................................................................................................. 10 STEERING ...................................................................................................................... 11 LIFT BOOM ..................................................................................................................... 12 TILT ................................................................................................................................. 13 SAW DRIVE .................................................................................................................... 17 CLAMPS WITH SAW ...................................................................................................... 18 CLAMPS WITH SHEAR .................................................................................................. 19 720csm00

720C Available Literature Operator's Manual Service Manual Parts Catalog Hydraulic Adapters Book Hose Assemblies Book

Part Part Part Part Part

No. No. No. No. No.

13037A 13038A 13036A 1472A 3707A

Tigercat

®

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

Tigercat 720C Feller Buncher

Introduction

ii

Tigercat 720C Feller Buncher

Introduction

Tigercat 720C Feller Buncher

INTRODUCTION An Operator's manual, Service manual and a Parts catalog are made available by Tigercat to assist the dealer, customer and operator in becoming familiar with the features of the 720C Feller Buncher.

The operator's manual will assist the operator with the techniques of proper and safe operation of the 720C Feller Buncher. There is also important information regarding the safe operation of the saw head.

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

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

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

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

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

Tigercat Industries Inc.

iii

Tigercat 720C Feller Buncher

Introduction

S.A.E. STANDARDS ROLL-OVER PROTECTION STRUCTURES (ROPS) FALLING OBJECTS PROTECTION STRUCTURES (FOPS) OPERATOR PROTECTION STRUCTURES (OPS) * MODIFICATIONS AND REPAIRS: The integrity of the ROPS, FOPS, OPS structure and its continued ability to provide the level of protection it was designed for could be seriously affected by any modifications to the structure, its mounting or to the chassis to which it is attached.

Tigercat emphasizes that the certification of approval of the ROPS, FOPS, OPS structure will become void if any such modifications take place.

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

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

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

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

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

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

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

Tigercat Industries Inc.

iv

Tigercat 720C Feller Buncher

Introduction

NON-APPROVED FIELD PRODUCT CHANGES The installation of any unauthorized attachment or changes made of any kind to this Tigercat product could affect the product's ability to perform as originally intended. The product's integrity, stability and it's ability to perform safely could be at serious risk.

IT IS Tigercat POLICY THAT NO CHANGES ARE TO BE MADE TO ITS PRODUCTS INCLUDING DELETIONS OR ADDITIONS OTHER THAN A Tigercat APPROVED OPTION FITTED IN THE FACTORY APPROVED MANNER. Official approval to make changes or install options is only to be undertaken as follows: i) The relevant options for that product must be shown or listed on current Tigercat documentation or literature such as a printed specification sheet, price list, parts manual, or product literature issued by Tigercat. ii) Approved options or product changes authorized in writing by the Tigercat Engineering Manager.

AUTHORIZATION BY ANY OTHER PERSON IS UNACCEPTABLE. Unauthorized changes made or contributed to by a person or organization may result in creating a dangerous situation and therefore the person or organization will be considered to have assumed the risk involved or be negligent in having created this situation.

Weight is an important factor when considering the addition of options or an attachment, Refer to your Tigercat distributor for information on maximum permissible operating weight and the effect the addition of various options may have on your machine.

Tigercat will not be held responsible for any situation that may arise resulting from Non-approved Field Product Changes to its product.

Should Tigercat become involved in a dispute resulting from changes made to the product without proper authorization by Tigercat as stated above, Tigercat will take whatever action is appropriate to protect its interests.

The product warranty policy and the certification on any safety items installed on the modified product will become NULL and VOID if the above policy is not adhered to as specified.

Non-approved product changes also nullify warranties given to Tigercat by its component manufacturers.

Tigercat Industries Inc.

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Tigercat 720C Feller Buncher

Introduction

vi

Tigercat 720C Feller Buncher

SECTION 1 - SAFETY MARCH 2003

CONTENTS - SECTION 1 ARTICULATION LOCK BAR .................................................................................. 1.10 BOOM LIFT LOCK ................................................................................................. 1.10 ENGINE ACCESS PANELS ................................................................................... 1.8 FIRE PREVENTION ............................................................................................... 1.12 FIRE PREVENTION GUIDELINES ..................................................................... 1.12 WHAT ELSE TO DO BEFORE YOU EXPERIENCE A FIRE ................................ 1.13 WHAT TO DO AFTER A FIRE ............................................................................. 1.14 WHAT TO DO IN CASE OF A MACHINE FIRE ................................................... 1.13 INTERLOCK SWITCHES ON DOORS .................................................................. 1.7 PARKING THE MACHINE ...................................................................................... 1.6 SAFETY PRECAUTIONS, GENERAL .................................................................... 1.3 SAFETY PRECAUTIONS, OPERATING ................................................................ 1.5 SAFETY PRECAUTIONS, SERVICING ................................................................. 1.8 SAFETY SYMBOLS ............................................................................................... 1.2

Tigercat 720C Feller Buncher

Safety

SAFETY SYMBOLS

This safety alert symbol means ATTENTION! BECOME ALERT! YOUR SAFETY IS INVOLVED! The safety alert symbol identifies important safety messages on machines, safety signs, in manuals, or elsewhere. When you see this symbol, be alert to the possibility of personal injury or death.

Follow the instructions in the safety message.

Understanding Signal Words

DANGER DANGER identifies the most serious hazards where failure to follow listed procedures would result in a high probability of death or serious injury.

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

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

IMPORTANT IMPORTANT is used to focus attention on items that should be checked, controlled, adjusted or cleaned to ensure the efficiency and long term operation of the machine.

1.2

Tigercat 720C Feller Buncher

Safety

GENERAL SAFETY PRECAUTIONS

KEEP BACK 500 FEET

Remember that safety is a prime responsibility of all.

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

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

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

DANGER ROTATING SAW The safety of persons outside the cab is the responsibility of the machine operator Always avoid the discharge side of a felling saw head. A saw head'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.

Do not let an untrained person operate the machine.

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

Repair or replace damaged labels.

1.3

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

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

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

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

Tigercat 720C Feller Buncher

Safety 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.

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

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

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

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

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

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

Machine should be washed completely at every major service.

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

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

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

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

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

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.

1.4

Tigercat 720C Feller Buncher

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

OPERATING SAFETY PRECAUTIONS

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

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

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

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

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

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 lap and shoulder harness belts. Use this restraint system at all times when operating the machine.

Start the engine according to the instructions in this manual.

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

Secure loose items in the cab.

1.5

Tigercat 720C Feller Buncher

Safety

OPERATING SAFETY PRECAUTIONS continued

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

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

NEVER travel across a STEEP slope or side hill:

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

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

• •

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

•

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

•

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

•

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

•

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

Serious injury or death could result from crushing.

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. Regularly inform other crew members of your intentions, location and length of time to perform duties.

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

When parking the machine: •

Park on level ground only and engage the parking brake.

Use only prearranged and approved signalling practices.

•

Do not park on a hillside or incline.

•

Lower felling attachment onto level ground.

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

•

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

•

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

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

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

1.6

Tigercat 720C Feller Buncher

Safety SWITCH

OPERATING SAFETY PRECAUTIONS continued

••

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

•• ACTUATOR

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

INTERLOCK SWITCH (L.H. DOOR SHOWN)

197-5

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

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

CAUTION

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

The steering system is always LIVE when engine is running. DO NOT use the steering wheel to assist entering or leaving the cab.

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

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

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

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

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

1.7

Tigercat 720C Feller Buncher

Safety LOWER ACCESS DOOR

SERVICING SAFETY PRECAUTIONS

LOCATION PINS

•

••

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

LOWER ACCESS PANEL TO HEAT EXCHANGE AREA

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

337-7

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

The LOWER engine compartment access panels are NOT HINGED or permanently attached to the machine, but are held in place by the UPPER DOORS (some also have a hand knob). Therefore they can fall during the process of removing them from the machine.

Once the UPPER DOOR is opened (and the hand knob loosened) the LOWER PANEL is not fully supported and it is not safe to apply any weight or pressure to the panel, as it may fall out of the remaining supports. Do not use these LOWER PANELS as hand grips, when servicing the machine.

CAUTION

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

UPPER DOOR

HAND KNOB

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

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

LOWER ACCESS PANEL

• •

•• • •• HAND KNOBS

337-12

ENGINE ACCESS PANELS

1.8

Tigercat 720C Feller Buncher SERVICING SAFETY PRECAUTIONS continued 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

Never use bare hand to check for fluid leaks.

Fluid leaks under pressure may not be visible.

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

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

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.

1.9

Safety 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.

Tigercat 720C Feller Buncher

Safety

SERVICING SAFETY PRECAUTIONS continued

WARNING

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

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

• Always install 'T' handle retainer bolt • Use only to support boom and cutting head • Do not use to set hydraulics pressures CAUTION Do not open cab doors or window screens when machine is on a slope. The doors and screens are heavy and could swing out with considerable force.

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

195-24

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

FRAME ARTICULATION LOCK BAR

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

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

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

1.10

Tigercat 720C Feller Buncher

Safety

SERVICING SAFETY PRECAUTIONS continued

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

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

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

Dispose of fluids properly.

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

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

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

1.11

Tigercat 720C Feller Buncher

Safety

FIRE PREVENTION

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

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.

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

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

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

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

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

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

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

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

4. Blow off all debris and dust accumulated near hot engine exhaust components (turbocharger and exhaust manifold as well as exhaust pipes and muffler) at the completion of each work shift or more frequently depending on logging conditions.

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

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

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

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

1.12

Tigercat 720C Feller Buncher

Safety WHAT TO DO IN CASE OF A MACHINE FIRE

FIRE PREVENTION continued

•

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

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

•

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

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

•

Shut the engine off.

•

Activate the fire suppression system*

•

Radio or call for help (as appropriate).

•

Exit the machine taking fire extinguisher or water hose (if applicable) with you.

•

If you can safely open the access panels to the machine, in the area of the fire, do so.

•

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

EQUIPMENT FIRES ADVERSELY EFFECT YOUR ABILITY TO LOG, MAY INCREASE YOUR INSURANCE PREMIUMS DRAMATICALLY OR PREVENT YOU FROM OBTAINING INSURANCE COVERAGE AT ALL. WHAT ELSE TO DO BEFORE YOU EXPERIENCE A FIRE •

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

•

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.

•

•

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.

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.

•

Prevent the fire from happening by ensuring that the machine is cleaned regularly and all systems are well maintained.

Continued on page 14

*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.

1.13

Tigercat 720C Feller Buncher

Safety WHAT TO DO AFTER A FIRE

FIRE PREVENTION continued Continued from page 13

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.

1.14

•

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

•

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

•

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

•

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

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

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

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

Tigercat

5211A • R2-1101

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®

using high speed disc saws safely FORWARD:

Tigercat

®

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

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

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

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

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

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

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

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

THE DANGERS

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

• Soil particles are thrown from the ground.

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

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

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

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

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

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

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

THROW ANGLE

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

•

•

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

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

THROW ANGLE

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

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

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

THROW ANGLE

NUDGED LOG WILL NOT CONTACT SAW TEETH.

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

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

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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.

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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.

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using high speed disc saws safely Comments and Instructions cont.

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

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

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

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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

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using high speed disc saws safely Comments and Instructions cont.

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

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

SLAB

•

SLAB

• FE

ED

IN

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

TH DIR ROW EC TIO N

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

FIGURE 8

THROW ENGAGEMENT DISTANCE FELLING HEAD MOVING INTO SLAB/LOG

®

SLAB

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

• •

FIGURE 8b SIDE VIEW

FEED IN

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

10

FIGURE 8c TOP VIEW

using high speed disc saws safely Comments and Instructions cont.

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

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

• FE

ED

IN

FELLING HEAD MOVING INTO LOG PILE

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

SMALL LOG

THROW ENGAGEMENT DISTANCE LOG PILE

FEED IN

•

•

A SAW HOUSING WITHOUT SNOUTS ALLOWS A LONG THROW ENGAGEMENT DISTANCE

FIGURE 9b SIDE VIEW

FIGURE 9c TOP VIEW

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

FEED IN

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using high speed disc saws safely Comments and Instructions cont.

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

UNCUT TREE OR STUMP BACKUP THROW ENGAGEMENT DISTANCE

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

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

FELLING HEAD MOVING INTO LOG

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

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

FELLING HEAD MOVING INTO STUMP (FEED SPEED)

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

12

using high speed disc saws safely Comments and Instructions cont.

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

THROW GAP

FIGURE 12: SAW BLADE THROW GAP

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using high speed disc saws safely Comments and Instructions cont.

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

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

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

FIGURE 13: SAW BLADE ENTRANCE AND EXIT SPACE

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using high speed disc saws safely Comments and Instructions cont.

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

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

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

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

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

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

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

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

Do not over speed the blade rpm.

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

Do not neglect tooth fastening inspection, maintenance and replacement.

Do not neglect to repair worn or damaged saw housings.

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

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

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

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

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

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

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

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

Do not select and operate heads that throw rearward.

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

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

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Tigercat 720C Feller Buncher SECTION 3 - LUBRICATION & MAINTENANCE AUGUST 2000

CONTENTS - SECTION 3 FILTERS CHARGE PUMP PRESSURE FILTER ..................................... 3.11 FUEL FILTER/WATER SEPARATOR ......................................... 3.10 FUEL TANK STRAINER ............................................................ 3.10 HYDRAULIC OIL RETURN FILTERS ........................................ 3.11 HYDRAULIC OILS ........................................................................ 3.7 NEW MACHINE MAINTENANCE FIRST 50-100 HOUR INSPECTION AND SERVICE REPORT ...3.2 INITIAL PRE-DELIVERY INSPECTION ......................................3.2 TIGHTENING POINTS ...............................................................3.2 PRESSURE SETTINGS WITH 1800 &2000 TIGERCAT BUNCHING SHEAR ........................... 3.16 SAW .......................................................................................... 3.17 SCHEDULED MAINTENANCE 1000 HOURS ..............................................................................3.6 125 HOURS ................................................................................3.5 2000 HOURS ..............................................................................3.6 250 HOURS ................................................................................3.5 500 HOURS ................................................................................3.5 8 HOURS ....................................................................................3.4 FREQUENTLY ............................................................................ 3.3 SEASONAL ................................................................................3.7 SERVICE AND LUBRICATION POINTS CHART .......................... 3.9 STARTUP PROCEDURE AFTER MAINTENANCE .....................3.12 TORQUE CHART .........................................................................3.14 TORQUE CHART, GENERAL ......................................................3.15 TRANSMISSION ..........................................................................3.13 CHECK OIL LEVEL .................................................................. 3.13 WHEELS, INSTALLING ................................................................. 3.2

Tigercat 720C Feller Buncher

Lubrication and Maintenance

PREVENTIVE MAINTENANCE SCHEDULE FOR 720C FELLER BUNCHER _______________________________________________________________________________________

NEW MACHINE MAINTENANCE *INITIAL PRE-DELIVERY INSPECTION:PERFORM THE INITIAL PRE-DELIVERY INSPECTION USING Tigercat FORM NUMBERS 5281 AND 5283; "PDI AND 50-100 HOUR INSPECTION REPORT"

*FIRST 50-100 HOUR INSPECTION AND SERVICE REPORT:WITH THE OWNER'S MECHANIC PRESENT, PERFORM AN INSPECTION AND SERVICE ACCORDING TO THE Tigercat FORM NUMBERS 5281 AND 5283; "PDI AND 50-100 HOUR INSPECTION REPORT" THIS MUST BE COMPLETED WITHIN THE FIRST 50-100 HOUR TIME FRAME. *IMPORTANT: TO QUALIFY FOR CONTINUED WARRANTY, THIS REPORT MUST BE COMPLETED AND RETURNED TO Tigercat Industries Inc. WARRANTY DEPARTMENT.

TIGHTENING POINTS FOR:THE FIRST 50-100 HOUR INSPECTION REPORT:~

IMPORTANT! __________________________________________

WHEELS: WHEN INSTALLING WHEELS, ENSURE THAT ALL PAINT HAS BEEN REMOVED FROM THE MATING SURFACES OF BOTH THE WHEEL DISC AND THE FLANGE OF THE AXLE TO ENSURE METAL TO METAL CONTACT.

ALL HYDRAULIC CONNECTIONS HOSE CLAMPS CENTER JOINT PIN SECURING BOLTS

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

TRANSMISSION SECURING BOLTS ENGINE MOUNTING BOLTS PUMP DRIVE GEARBOX SECURING BOLTS

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

AXLE MOUNTING BOLTS WHEEL RETAINING BOLTS CAB SECURING BOLTS

THE INTERVALS AND TIMES ON THE SCHEDULED MAINTENANCE CHART IN THIS MANUAL ARE FOR NORMAL OPERATING CONDITIONS.

PIN RETAINERS ANY OTHER LOOSE NUT, BOLT OR FITTING

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

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

_______________________________________________________________________________________

REFER TO DIESEL ENGINE SERVICE MANUAL AND ATTACHMENT MANUAL FOR ADDITIONAL REQUIRED MAINTENANCE AT THIS SCHEDULED TIME PERIOD. _______________________________________________________________________________________ 3.2

Tigercat 720C Feller Buncher

Lubrication and Maintenance

GENERAL

CAUTION ALL HANDLES, STEPS AND PLATFORMS MUST BE KEPT FREE OF GREASE, OIL FUEL, MUD, SNOW AND ICE.

þ CLEAN AROUND FILLER CAPS BEFORE CHECKING OR ADDING FLUIDS þ RELEASE HYDRAULIC PRESSURES AND CLEAN AROUND HYDRAULIC FITTINGS BEFORE BREAKING CONNECTION. PLUG OR CAP IMMEDIATELY þ CLEAN UP SPILLS AS SOON AS POSSIBLE þ ALWAYS USE CLEAN HYDRAULIC OIL AND FILTERS 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

þ CLEAN UP OIL SPILLS ON WALKING SURFACES AND TOP OF ENGINE ENCLOSURE IMMEDIATELY þ BEFORE WELDING ON MACHINE BE SURE MASTER SWITCH IS DISCONNECTED þ WHEN WELDING SECURE GROUND CONNECTION AS CLOSE TO WORKING POSITION AS POSSIBLE TO PREVENT ARCING ACROSS MACHINED SURFACES OR THROUGH BEARINGS þ CLEAN AWAY ALL BRANCHES, BARK AND CHIPS. CLEAN UP ALL TRACES OF OIL TO AVOID FIRES þ ALWAYS HAVE A FIRE EXTINGUISHER AT HAND þ FOR SAFETY, ALWAYS LOWER BOOM ASSLY. TO THE GROUND WHEN LEAVING CAB, LEAVING MACHINE UNATTENDED OR DURING SERVICE þ FOR SAFETY, WHEN WORKING UNDER BOOM, ALWAYS LOWER TO GROUND, SUPPORT PROPERLY OR INSTALL LIFT BOOM CYLINDER LOCKING DEVICE .

(REFER TO SECTION 2 OF THIS MANUAL) ______________________________________________

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

3.3

Tigercat 720C Feller Buncher

Lubrication and Maintenance

SCHEDULED MAINTENANCE FREQUENTLY:~

• LUBRICATE LIFT BOOM AND TILT LINKAGE, 9 OR 10 FITTINGS, DEPENDING ON FELLING HEAD), PURGE

• CHECK ENGINE COOLING AIR INTAKE SCREENS FOR POSSIBLE RESTRICTION

CLEAN:~

______________________________________________

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

EVERY 8 HOURS (EVERY SHIFT):~

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

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

• FOR LOOSE NUTS, BOLTS AND FITTINGS

• CHECK ENGINE COOLANT LEVEL

• CONDITION AND TENSION OF FAN BELTS.

• CHECK ENGINE OIL LEVEL

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

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

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

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

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

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

______________________________________________

• LUBRICATE AXLES ~ OUTER BEARINGS 1 FITTING, 4-PLACES, LUBRICATE UNTIL GREASE FLOWS OUT PAST THE OUTER SEALS. DO NOT USE POWER GREASERS AS IT WILL DAMAGE THE SEALS. • LUBRICATE MID DRIVE SHAFT SLIP JOINT* 1-FITTING, PURGE *NOTE: LUBRICATE MID DRIVE SHAFT SLIP JOINT WITH MACHINE ARTICULATED • LUBRICATE FRONT DRIVE SHAFT SUPPORT BEARING, 1-FITTING, PURGE • LUBRICATE CENTER JOINT BEARINGS, 2-FITTINGS, PURGE • LUBRICATE STEERING CYLINDER ENDS, 4-FITTINGS, PURGE • LUBRICATE TILT AND LIFT CYLINDER ENDS, 8-FITTINGS, PURGE 3.4

Tigercat 720C Feller Buncher

Lubrication and Maintenance

SCHEDULED MAINTENANCE EVERY 125 HOURS:~

CLEAN/REPLACE:-

• PERFORM "FREQUENTLY" MAINTENANCE

• AIR CONDITIONER RE-CIRCULATION FILTER

• PERFORM 8 HOUR MAINTENANCE

• CAB FRESH AIR FILTER

AND IN ADDITION:~

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

• LUBRICATE REAR AXLE PIVOT, 2-FITTINGS, PURGE • LUBRICATE REAR DRIVE SHAFT SLIP JOINT 1-FITTING, PURGE

______________________________________________

CHECK:-

EVERY 250 HOURS:~

• FLUID LEVEL IN BATTERIES UNLESS MAINTENANCE FREE • ENGINE R.P.M.

• PERFORM "FREQUENTLY" MAINTENANCE

• HYDRAULIC PUMP AND MOTOR SECURING BOLTS

• PERFORM 8 HOUR MAINTENANCE • PERFORM 125 HOUR MAINTENANCE

• CHECK FUEL TANK FILLER SCREEN

AND IN ADDITION REPLACE:~

• TORQUE TIGHTENING POINTS AS PER NEW MACHINE MAINTENANCE

• ENGINE OIL AND CHANGE OIL FILTER • ENGINE FUEL FILTER

• PROPER OPERATION OF PRESSURIZED WATER SYSTEM. (REFER TO SECTION 2 IN THE OPERATOR'S MANUAL)

• FUEL/WATER SEPARATOR • AIR INTAKE PRIMARY ELEMENT • OIL IN PUMP DRIVE GEARBOX

VISUALLY CHECK FOR DAMAGE TO:-

• OIL IN TRANSMISSION

• LIFT BOOM AND TILT LINKAGE

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

• FRONT AND REAR FRAME • CENTER JOINT AREA • ATTACHMENT MAKE REPAIRS IMMEDIATELY

______________________________________________ Continued on page 6

VISUALLY INSPECT FOR:• FRAYED ELECTRICAL WIRING AND HYDRAULIC HOSE • WEAR IN ANY OTHER COMPONENTS

3.5

Tigercat 720C Feller Buncher

Lubrication and Maintenance

SCHEDULED MAINTENANCE Continued from page 5

EVERY 1000 HOURS:~

EVERY 500 HOURS:~ • PERFORM "FREQUENTLY" MAINTENANCE • PERFORM 8 HOUR MAINTENANCE

• PERFORM "FREQUENTLY" MAINTENANCE

• PERFORM 125 HOUR MAINTENANCE

• PERFORM 8 HOUR MAINTENANCE

• PERFORM 250 HOUR MAINTENANCE

• PERFORM 125 HOUR MAINTENANCE

• PERFORM 500 HOUR MAINTENANCE

• PERFORM 250 HOUR MAINTENANCE

AND IN ADDITION REPLACE :~

AND IN ADDITION REPLACE:~

• ENGINE AIR CLEANER UNLOADER VALVE

• AIR INTAKE SAFETY ELEMENT

CHECK:~

• HYD. OIL PRESS. FILTER, CH. PUMP OUTLET †

• STRAINER IN ACCUMULATOR CHARGE VALVE

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

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

†

• HYD. OIL RETURN FILTER, PILOT † CHECK:~

______________________________________________

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

EVERY 2000 HOURS:~

• PARKING BRAKE LEVER IN CAB, APPLY WD-40 TO BOTH SIDES OF SLIDE AND CLEVIS PIN

• PERFORM "FREQUENTLY" MAINTENANCE • PERFORM 8 HOUR MAINTENANCE

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

• PERFORM 125 HOUR MAINTENANCE • PERFORM 250 HOUR MAINTENANCE • PERFORM 500 HOUR MAINTENANCE • PERFORM 1000 HOUR MAINTENANCE AND IN ADDITION REPLACE:~ • OIL IN AXLES, FRONT AND REAR • OIL IN HYDRAULIC RESERVOIR • WATER IN PRESSURIZED WATER SYSTEM REFER TO DIESEL ENGINE SERVICE MANUAL AND ATTACHMENT MANUAL FOR ADDITIONAL REQUIRED MAINTENANCE AT THIS SCHEDULED TIME PERIOD. ______________________________________________

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

3.6

Tigercat 720C Feller Buncher

Lubrication and Maintenance

SCHEDULED MAINTENANCE SEASONAL:~ DRAIN AND REFILL HYDRAULIC OIL TANK AND BOTH FRONT AND REAR AXLES WITH RECOMMENDED HYDRAULIC OIL. SEE "APPROVED HYDRAULIC OILS" ALSO SEE SECTION 8 OF THE SERVICE MANUAL FOR AXLE DRAINING PROCEDURE. DRAIN AND REFILL PRESSURIZED WATER SYSTEM. (REFER TO SECTION 2 IN THE OPERATOR'S MANUAL) ______________________________________________

APPROVED HYDRAULIC OILS IN ADDITION TO PROVIDING THE VEHICLE WITH ITS NORMAL OPERATIONAL FUNCTIONS, HYDRAULIC OIL IS ALSO USED TO FILL THE AXLE ASSEMBLIES, APPLY BRAKES AND OPERATE DIFFERENTIAL LOCKS. WET DISK BRAKES IN THE AXLES REQUIRE OIL WITH SPECIFIC PROPERTIES TO ENSURE REDUCED CHATTER AND ENSURE PROPER LUBRICATION OF MECHANICAL COMPONENTS.

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

TRACTOR HYDRAULIC FLUID (SUMMER)

CITGO

TRACTOR HYDRAULIC FLUID (33-310) (SUMMER)

IMPERIAL

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

SHELL

DONAX TD (SUMMER) DONAX TDL (WINTER)

SUN

SUNFLEET TH FLUID (SUMMER)

JOHN DEERE

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

3.7

Tigercat 720C Feller Buncher

ATTACHMENT

4 FTG/8 $

Lubrication Lubricationand andMaintenance Maintenance

OUTER AXLE BEARINGS 21

4 FTG/8 $

1

25

4

7

8

22

6 5 12

13 14 15 19 STEER CYLINDERS

8 FTG/8 $

4 FTG/8 $

BOOM CYLINDER PINS

9 FTG/8 $

8 FTG/500 $

2 FTG/125 $

DOOR SCREEN HINGES

AXLE OSCILLATION

24 23 2

BOOM/LINK PINS

1

10 11

9

5 6 16

4 18

2 FTG/8 $

18

CENTER JOINT 3

REAR DRIVE SHAFT

2 FTG/8 $

20

22

17

1 FTG/125 $

MID DRIVE SHAFT & FRONT DRIVE PILLOW BLOCK BEARING

LEGEND ***

2 FTG/125 $

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

†

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

11683BIL1.EPS 11683B

3.8

$

CHK REP DRN D/R LUB

HOURS CHECK REPLACE DRAIN DRAIN AND REFILL LUBRICATE

Tigercat Tigercat 720C 720C Feller Feller Buncher Buncher

Lubrication Lubrication and Maintenance and Maintenance

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

1

COOLING SYSTEM

30

QTY

USG

LITERS

2000 6

500 6

250 6

125 6

86

ITEM

CAPACITY

1000 6

SERVICE POINT NO.

SERVICE EVERY

8

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

CHK 2

SCREENS (COOLING SYSTEM)

CHK

3

CENTER JOINT PIVO T

LUB

4

ENGINE OIL AND FILTER JOHN DEERE CUMMINS 'C' SERIES - 724 CUMMINS 'B' SERIES - 720C

CHK CHK CHK

5

FUEL FILTER

6

FUEL W ATER SEPARATOR

7

FUEL CAP SCREEN

8

INTAKE FUEL STRAINER

9 10 11

AIR INTAKE PRECLEANER

CHK

2

REP REP REP

19 5 18.9 5 14.2 3.75

REP

1 1

CHECK MOTION BETWEEN CHASSIS LUGS SEE ENGINE MANUFACTURER'S MAINTENANCE MANUAL

1

DRN

1 CHK CHK

1

CLEAN OR REPLACE AS NECESSARY

1

DRAIN TANK, CLEAN OR REPLACE AS NECESSARY

CHK

AIR INTAKE PRIMARY FILTER ELEMENT AIR INTAKE SAFETY FILTER ELEMENT

DESCRIPTION

CHK REP

1 REP

1

REP V

1

REP V

2

12

HYDRAULIC OIL FILTER TRAVEL/STEER

13

HYDRAULIC OIL FILTER BOOM/SAW

14

HYDRAULIC OIL FILTER PILOT

REP V

1

15

HYDRAULIC DRIVE CHARGE PRESSURE FILTER

REP V

1

16

PUMP DRIVE GEARBOX

CHK

D/R

4

1.1

TRANSMISSION

CHK

D/R

5.7

1.5

D/R D/R

34 28

9.0 7.4

D/R

197

52

CHK

AXLES:

FRONT REAR

19

HYDRAULIC RESERVOIR

20

PARKING BRAKE

21

ATTACHMENT

LUB

22

PRESSURIZED WATER SYSTEM

CHK TEST

23 24

ACCUMULATOR CHARGE VALVE STRAINER A/C & HEATER FILTERS

25

OUTER AXLE BEARINGS

CHK

CHECK RESTRICTIO N INDICATOR ON FILTER HEAD AT FULL ENGINE RPM

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

17 18

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

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

CHK LUB

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

D/R

REP CHK

1 CLEAN OR REPLACE AS NECESSARY

LUB* LUB*

ALWAYS WITH A HAND GREASE G UN. LUBRICATE UNTIL G REASE FLOW S OUT PAST THE OUTER SEAL. * UNDER NORMAL CO NDITIONS EVERY 125 HOURS, UNDER ADVERSE CONDITIONS (MUD, W ATER, SNOW ) EVERY 8 HO URS,

720C-724LUBCHART.XLS

3.9

Tigercat 720C Feller Buncher

Lubrication and Maintenance

FILTERS - REMOVE AND REPLACE

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

IMPORTANT

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

Failure to service and replace filters at the proper intervals specified in the manufacturer's manuals, could cause damage to the machine and result in the product warranty becoming NULL and VOID. Check Tigercat parts catalog for replacement filters.

12. Screw the new filter on to the filter head until the gasket makes contact with the seat and then hand tighten an additional 3/4 turn only.

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

FUEL FILTER/WATER SEPARATOR FUEL TANK STRAINER

NOTE: The following information applies to Cummins engine only, for Deere engine, see MANUFACTURER'S OPERATION AND MAINTENANCE MANUAL.

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

Changing or cleaning the strainer:

The fuel filter/water separator is a combination unit, with a replaceable fuel filter and a removable water sediment bowl on the bottom of the unit. The water sediment bowl is only replaced if it becomes damaged or non-functional. For service and replacement intervals see SERVICE AND LUBRICATION CHART in THIS SECTION. Changing the filter: 1. Park machine on level ground, install articulation lock bar, lower cutting head to ground, stop engine, pull parking brake ON and block wheels.

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

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

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

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

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

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

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

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

5. Remove and discard the small 1” I.D. gasket from the threaded extension on the filter head.

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

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

7. Clean the water sediment bowl.

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

7. Reinstall the strainer using the hex on end.

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

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

9. Lubricate gasket for bottom of filter and water sediment bowl with clean engine oil and carefully hand tighten the water sediment bowl onto the new filter. It is plastic and will break if over tightened. Close the water drain valve.

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

3.10

Tigercat 720C Feller Buncher

Lubrication and Maintenance

HYDRAULIC OIL RETURN FILTERS

9. Install new square section gasket in groove in filter head.

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

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

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

12. Start the engine and check for leaks.

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

HYDROSTATIC CHARGE PUMP PRESSURE FILTER

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

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

•

FILTER HEAD

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

For service and replacement intervals see SERVICE AND LUBRICATION CHART in THIS SECTION. Changing the filters: 1. Park machine on level ground, install articulation lock bar, lower cutting head to ground, stop engine, pull parking brake ON and block wheels.

• GASKET

•

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

FILTER ELEMENT FILTR_SEALS2

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

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

6. The Tigercat spin-on filter element is supplied with two gaskets. The 720C uses the square section gasket for all four return filters. Discard the round gasket, as it is used only on the earlier model Tigercat 720.

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

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

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

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

6. The new filter has an attached gasket. Prefill the new filter with clean hydraulic oil and apply hydraulic oil to the gasket surface.

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

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

9. Start the engine and check for leaks.

8. Apply clean oil to new square gasket surfaces.

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

3.11

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

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

This procedure should be followed: •

After major service or a rebuild.

•

Whenever the machine has been drained of hydraulic oil.

•

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

NOTE: When the saw head is attached, re-torque all teeth (See saw manual). Attach the SAW BLADE GUARD and insert the SAW BLADE LOCKING PIN. 1. Ensure the articulation lock bar is installed.

2. Cummins engine - disconnect red(13) and white (54) wires on injector pump solenoid (prevents engine starting).

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

Deere engine - disconnect red(13) and tan (69) wires on injector pump solenoid (prevents engine starting).

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

3. Check coolant level in the radiator.

CAUTION

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

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

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

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

6. Turn both differential lock switches to OFF. 7. Do not start engine. Purge air from hydraulic system as follows: • • •

•

•

•

•

Fill the hydraulic tank if it has been drained.

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

Remove the air bleed plugs from the two steel suction tubes on the side of the oil reservoir.

Remove the breather assembly from the hydraulic tank and pressurize the hydraulic tank through this opening using air or nitrogen. To ensure that the hydraulic tank is not contaminated use a clean rag as a filtering device.

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

When a constant stream of oil without any air exits each of the suction tubes replace the air bleed plugs. Do not remove pressure from the tank until both air bleed plugs are fully tightened.

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

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

4. Reconnect wires on injector pump solenoid.

Do not start engine.

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

Watch gauge closely during startup.

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

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

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

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

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

Remove pressure gauge from the pilot manifold.

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

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

13. With engine at IDLE, parking brake ON, hold

3.12

Tigercat 720C Feller Buncher

Lubrication and Maintenance

foot brake down, bleed brakes in rear axle.

Remove gauge from steer relief valve.

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

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

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

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

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

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

17. At FULL throttle, operate all other functions for 2 CHECK OIL LEVEL minutes to flush circuits.

Check oil level at end of every 8 hour shift.

IMPORTANT

Procedure:

Without a felling head attached, the tilt function can cause damage to the arms. Watch the two LINK ARMS very carefully, as they may drop down beside the boom arms and wedge, causing the crank arms to bend. When necessary, lower the boom DOWN, watching closely and tilt FORWARD, again watching the link arms closely.

FILL PLUG

•

TRANSMISSION OIL LEVEL CHECK

•

CRANK,LINK AND BOOM ARMS CHECK TRANSMISSION OIL LEVEL • Park on level ground, lower felling head, set parking brake on and turn off engine.

337-9

CRANK ARM LINK ARM

••

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

•

• If required: add the recommended grade of oil through oil fill plug.

•

Do not overfill.

BOOM ARM

• 192-21A

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

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

3.13

Tigercat 720C Feller Buncher

Lubrication and Maintenance

TORQUE CHART LOCATION

Cylinders Pin bolts Piston nut, steer cyl.

Piston nut, boom/tilt cyl.

Gland, steer cyl.

Keeper plate bolts

THREAD DIAMETER

TORQUE (LUBRICATED) lbf-ft Nm

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

282-310 930 1640 450 282-310

393-420 1282 2260 620 389-420

Center joint bearing Bearing retaining bolts Pin retaining bolts

1/2" UNC 3/4" UNC

80-88 282-310

109-119 393-420

Engine mounting Bolts

7/8" UNC

364

500

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

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

33-36 33-36 32 159-175

45-49 45-49 43 216-237

1 1/4" x 12 UNF 3/4" UNC

300-350 357

407-475 484

3/8" UNF

37-49

50-66

3/8" UNF

37-49

50-66

Axle mounting bolts Front Rear

7/8" UNC 3/4" UNC

364 226

500 310

Wheel bolts

7/8" UNF

500-550

679-745

Transmission weldment to frame

7/8" UNC

364

500

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.

3.14

Tigercat 720C Feller Buncher

Lubrication and Maintenance

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

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

IMPERIAL

GRADE 5 BOLTS

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

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

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

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

METRIC

SIZE

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

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

M6 M8 M10

4.8 12 23

3.5 8.5 17

6 15 29

4.5 11 21

9 22 43

6.5 16 32

11 28 55

8.5 20 40

13 32 63

9.5 24 47

17 40 80

12 30 60

15 37 75

11.5 28 55

19 47 95

14.5 35 70

M12 M14 M16

40 63 100

29 47 73

50 80 125

37 60 92

75 120 190

55 88 140

95 150 240

70 110 175

110 175 275

80 130 200

140 225 350

105 165 225

130 205 320

95 150 240

165 260 400

120 190 300

M18 M20 M22

135 190 260

100 140 190

175 240 330

125 180 250

260 375 510

195 275 375

330 475 650

250 350 475

375 530 725

275 400 540

475 675 925

350 500 675

440 625 850

325 460 625

560 800 1075

410 580 800

M24 M27 M30

330 490 675

250 360 490

425 625 850

310 450 625

650 950 1300

475 700 950

825 1200 1650

600 875 1200

925 1350 1850

675 100 1350

1150 1700 2300

850 1250 1700

1075 1600 2150

800 1150 1600

1350 2000 2700

1000 1500 2000

M33 M36

900 1150

675 850

1150 1450

850 1075

1750 2250

1300 1650

2200 2850

1650 2100

2500 3200

1850 2350

3150 4050

2350 3000

2900 3750

2150 2750

3700 4750

2750 3500

3.15

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

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

Tigercat 720C Feller Buncher

Lubrication and Maintenance

PRESSURE SETTINGS WITH SHEAR (Tigercat 1800 and 2000 BUNCHING SHEAR)

Engine RPM ................................................................................. 2200 RPM MAX 1000 RPM IDLE HYDROSTATICS Charge Pressure Rexroth Pump ................................................................................. 450 PSI @ 2200RPM Rexroth Motor .................................................................................. NON - ADJUSTABLE Pump Main Reliefs P.O.R. Forward ............................................................................. 5050 PSI @2200 RPM P.O.R. Reverse ............................................................................. 5050 PSI @2200 RPM High Pressure Relief Forward (@155 psi without creep OR @ 1/3 pedal with creep) .............. 5675 PSI @2200 RPM High Pressure Relief Reverse (@155 psi without creep OR @ 1/3 pedal with creep) .............. 5675 PSI @2200 RPM Drive Motors Drive Motor P.O.R. ........................................................................ 4000 PSI @2200 RPM Drive Motor Minimum Displacement (90mm screw length) ......... x= 19mm Drive Motor Begin of Displacement Control Pressure (early machines only - without creep) ...... 145-155 PSI @2200 RPM BOOM/STEER PUMP Steer Main Relief........................................................................... 2500 PSI @2200 RPM Steer Port Relief Left ..................................................................... 3200 PSI @1000 RPM Steer Port Relief Right .................................................................. 3200 PSI @1000 RPM ATTACHMENT PUMP Shear Pump P.O.R. ...................................................................... 3500 PSI @1000 RPM Shear Pump Low Pressure Control ............................................. Turned in Fully BOOM VALVE Shear/Clamp Close Port Relief (End Inlet) ...................................3700 PSI Clamp Open Port Relief ................................................................3700 PSI Mid Inlet Main Relief ..................................................................... 2600 PSI Tilt In Port Relief ............................................................................2900 PSI Tilt Out Port Relief ......................................................................... 2900 PSI Accumulator Close Port Relief ...................................................... 3200 PSI Accumulator Open Port Relief ...................................................... 3200 PSI Shear Open Port Relief ................................................................. 3200 PSI Lift Up Port Relief .......................................................................... 2900 PSI Lift Down Port Relief ..................................................................... 2200 PSI

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

PILOT MANIFOLD Pilot Pressure Reducing Valve ........................................................ 550 PSI @1000 RPM Pilot Pressure Relief Valve .............................................................. 675 PSI @1000 RPM BRAKES Brake Maximum Pressure ............................................................. 1000 PSI @1000 RPM

ISSUE 2 900

3.16

Tigercat 720C Feller Buncher

Lubrication and Maintenance

PRESSURE SETTINGS WITH SAW Engine RPM ................................................................................ 2200 RPM MAX 1000 RPM IDLE HYDROSTATICS Charge Pressure Rexroth Pump .................................................................................. 450PSI @2200 RPM Rexroth Motor .................................................................................. NON - ADJUSTABLE Pump Main Reliefs P.O.R. Forward ............................................................................. 5050 PSI @2200 RPM P.O.R. Reverse ............................................................................. 5050 PSI @2200 RPM High Pressure Relief Forward (@155 psi without creep OR @ 1/3 pedal with creep) .............. 5675 PSI @2200 RPM High Pressure Relief Reverse (@155 psi without creep OR @ 1/3 pedal with creep) .............. 5675 PSI @2200 RPM Drive Motors Drive Motor P.O.R. ........................................................................ 4000 PSI @2200 RPM Drive Motor Minimum Displacement (90mm screw length) ......... x= 19mm Drive Motor Begin of Displacement Control Pressure (early machines only - without creep) ...... 145-155 PSI @2200 RPM BOOM/STEER PUMP Steer Main Relief............................................................................ 2500PSI @2200 RPM Steer Port Relief Left ...................................................................... 3200PSI @1000 RPM Steer Port Relief Right ................................................................... 3200PSI @ 1000RPM ATTACHMENT Saw Pump P.O.R. .......................................................................... 3600PSI @1000 RPM Saw Pump Low Pressure Control ................................................. Turned in fully Saw Motor P.O.R. .......................................................................... 3100PSI @2200 RPM Saw Blade Speed (Tigercat Model DW5000) ......................................... 1275 ± 25 RPM Saw Blade Speed (Tigercat Model DW5500, DW5600 & DW5700) ........ 1150 ± 25 RPM Saw Blade Speed (Koehring Waterous 20") ............................................ 1175 ± 25 RPM BOOM VALVE Saw Main Relief ............................................................................ 3900 PSI Mid Inlet Main Relief ...................................................................... 2600PSI Tilt In Port Relief............................................................................. 2900PSI Tilt Out Port Relief .......................................................................... 2900PSI Accumulator Close Port Relief ....................................................... 3200PSI Accumulator Open Port Relief ....................................................... 3200PSI Clamp Open Port Relief ................................................................. 1100PSI Clamp Close Port Relief ................................................................. 3200PSI Lift Up Port Relief ........................................................................... 2900PSI Lift Down Port Relief ...................................................................... 2200PSI

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

PILOT MANIFOLD Pilot Pressure Reducing Valve......................................................... 550PSI @1000 RPM Pilot Pressure Relief Valve ............................................................... 675PSI @1000 RPM BRAKES Brake Maximum Pressure .............................................................. 1000PSI @1000 RPM ISSUE 3 900

3.17

Tigercat 720C Feller Buncher

Lubrication and Maintenance

3.18

Tigercat 720C Feller Buncher SECTION 5 - PILOT SYSTEM AUGUST 2000

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

Tigercat 720C Feller Buncher PILOT SYSTEM COMPONENTS

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

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

PRESSURE PORT

STEERING PORT

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

DRAIN PORT ACCUMULATOR PORT

ACCUMULATOR CHARGE VALVE

MO-03

ACCUMULATOR CHARGE VALVE

OPERATING DESCRIPTION

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

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

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

This filter should be replaced every 1000 hours.

For filter replacement procedures, refer to

SYSTEM PRESSURE

FILTER LOCATION

ACCUMULATOR PRESSURE

RETURN LINE PRESSURE

UPPER LIMIT CHECK BALL

UPPER LIMIT CHECK BALL

PILOT VALVE SPOOL TO ACCUMULATOR

PILOT VALVE SPOOL RETURN

TO ACCUMULATOR

LOWER LIMIT CHECK BALL PILOT VALVE SPRING

CHECK VALVE

RETURN

LOWER LIMIT CHECK BALL PILOT VALVE SPRING

CHECK VALVE ORIFICE

ORIFICE

CHARGING VALVE SPRING

SPOOL STOP

TO STEER VALVE

PRESS. PORT

CHARGING VALVE SPOOL

SPOOL STOP

CHARGING VALVE SPRING

ACCUMULATOR CHARGED

ACCUCHG

TO STEER VALVE

PRESS. PORT

CHARGING VALVE SPOOL

ACCUMULATOR BEING CHARGED

TYPICAL CHARGING VALVE SCHEMATICS 5.2

Tigercat 720C Feller Buncher

Pilot System

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

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

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

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

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

BRAKE ACCUMULATOR

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

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

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

VALVE GUARD

VALVE CAP GAS VALVE

BODY

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

BLADDER

HYDRAULIC CONNECTION

ACCUMULATORS

ACCU-1

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

POPPET (Seats against oil port after oil evacuation)

ACCUMULATOR (BLADDER TYPE)

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

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

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

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

Tigercat 720C Feller Buncher

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

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

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

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

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

(P2) (P2) (P2) (C1) Solenoid valve (C2) Solenoid valve (C3) Solenoid valve (C4) Solenoid valve (C5) Solenoid valve (C8) Solenoid valve

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

OPERATING DESCRIPTION The pilot manifold consists of a one piece manifold block into which, a pressure reducing valve, a pressure relief valve and a pilot shut off solenoid valve are installed. Six solenoid operated control valves are installed at outlet ports C1, C2, C3, C4, C5, and C8. Plugs are installed in ports C6 and C7 on standard machines. A “quick connect” type test port fitting is installed in port P2 for attaching a pressure gauge during hydraulic set-up procedures.

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

The solenoid operated pilot valves control the position of the spool valves or pistons to which they are hydraulically connected. When a solenoid operated pilot valve is energized, usually by a switch in the cab, pilot oil is directed shift the spool in the 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 entering the pilot manifold passes through the pilot pressure reducing valve. The pilot pressure reducing valve reduces and maintains the pilot pressure on the outlet side of the pilot manifold to a pre-set value.

5.4

Tigercat 720C Feller Buncher

Pilot System

PILOT MANIFOLD WITH OPTIONAL FAN PURGE SWITCH 15

•

•

SOLENOID OPERATED CONTROL VALVE(S)

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

PRESSURE REDUCING VALVE RELIEF VALVE

PILOT OIL TO BOOM JOYSTICK (END OF BLOCK)

PLUGGED PORTS

PILOT SHUT OFF VALVE

GAUGE TEST PORT

ACCUMULATOR OPEN

ORIFICE ACCUMULATOR CLOSE

CREEP (IF EQUIPPED) REAR DIFFERENTIAL LOCK

IN FROM ACCUMULATOR CHARGE VALVE

AW119

SAW DRIVE FRONT DIFFERENTIAL LOCK ORIFICE

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

PILOT MANIFOLD ASSEMBLY 5.5

Tigercat 720C Feller Buncher

Pilot System

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

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

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

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

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

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

These three valves are manually operated pilot valves.

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

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

5.6

Tigercat 720C Feller Buncher

720C-07

Pilot System

PILOT CIRCUIT (WITH SAW) 5.7

Tigercat 720C Feller Buncher RELEASE PILOT SYSTEM PRESSURE

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

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

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

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

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

The following steps must be followed to release pressure:

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

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

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

b) activate all controls (switches, joysticks, foot pedals etc.) and pump brake foot pedal at least 50 times or more.

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

c) pressure may remain in the system after these numerous applications, use caution when loosening hydraulic connections.

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

PRESSURE PORT STEERING PORT

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

AU001-3

ACCUMULATOR CHARGE VALVE (EXPLODED VIEW) 5.8

Tigercat 720C Feller Buncher

Pilot System

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

•

Pilot Accumulator pre-charge - 750 psi Brake Accumulator pre-charge - 700 psi

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

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

Re-check pre-charge and adjust if necessary.

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

•

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

•

Remove the valve guard and cap.

•

Screw the charging and testing device onto the gas valve.

•

Open the gas shut-off valve on the nitrogen

HOSE*

•

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

•

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

NEVER USE AN AUTOMOTIVE TYPE VALVE.

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

Refer to RELEASE PILOT SYSTEM PRESSURE in THIS SECTION.

ACCUMULATOR

ASSEMBLY PART NO. 90254 INCLUDES PARTS SHOWN *

CHARGING AND TESTING DEVICE

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

bottle and allow gas to flow slowly into the accumulator.

•

Disconnect hose from nitrogen bottle.

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

ADAPTER*

ACCU-2

•

CHECKING THE PRE-CHARGE PRESSURE

PRESSURE GAUGE*

ADAPTER*

NITROGEN BOTTLE

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

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

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

5.9

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

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

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

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

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

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

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

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

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

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

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

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

PRESSURE REDUCING VALVE

• RELIEF VALVE

The following steps must be followed to release pressure:

•

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

AW119

5.10

PILOT MANIFOLD

Tigercat 720C Feller Buncher HYDRAULIC OIL HEATING PROCEDURE

Pilot System 5. Adjust throttle to FULL. 6.

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

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

WARNING

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

Install articulation lock bar, block wheels and stop engine.

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

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

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

• MID INLET MAIN RELIEF

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

MID INLET MAIN RELIEF

• WARNING

306-4

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

BOOM VALVE

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

9. Return boom valve mid inlet main relief to normal pressure settings using clamp closed function, refer to PRESSURE SETTINGS in SECTION 18 (SAW) or SECTION 19 (SHEAR).

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

5.11

Tigercat 720C Feller Buncher

Pilot System

5.12

Tigercat 720C Feller Buncher SECTION 6 - ELECTRICAL, GAUGES & ALARMS AUGUST 2000

CONTENTS - SECTION 6 ELECTRICAL SCHEMATIC MACHINE WITH CUMMINS 'B' ENGINE ......................................................................... 6.4, 6.5 MACHINE WITH JOHN DEERE ENGINE ........................................................................ 6.2, 6.3 GAUGES AND ALARMS ............................................................................................................ 6.8 INSTRUMENT PANEL WIRING DIAGRAM ................................................................................ 6.7 RELAYS AND FUSES ................................................................................................................ 6.6 SENSOR LOCATIONS ............................................................................................................... 6.9 TROUBLESHOOTING AND TESTING ...................................................................................... 6.8 WIRE COLOUR CODE CHART ................................................................................................. 6.6

Tigercat 720C Feller Buncher

Electrical, Gauges and Alarms

REFER TO COLOUR CODE CHART IN THIS SECTION

720C01

MACHINE WITH JOHN DEERE ENGINE OPTION ONLY SCHEMATIC DIAGRAM 9312B (REV 2, SHEET 1) 6.2

Tigercat 720C Feller Buncher

Electrical, Gauges and Alarms

REFER TO COLOUR CODE CHART IN THIS SECTION

720C02

MACHINE WITH JOHN DEERE ENGINE OPTION ONLY SCHEMATIC DIAGRAM 9312B (REV 2, SHEET 2) 6.3

Tigercat 720C Feller Buncher

Electrical, Gauges and Alarms

REFER TO COLOUR CODE CHART IN THIS SECTION

720C-18

MACHINE WITH CUMMINS 'B' ENGINE OPTION ONLY SCHEMATIC DIAGRAM 10547B (REV 0, SHEET 1) 6.4

Tigercat 720C Feller Buncher

Electrical, Gauges and Alarms

REFER TO COLOUR CODE CHART IN THIS SECTION

720C-19

MACHINE WITH CUMMINS 'B' ENGINE OPTION ONLY SCHEMATIC DIAGRAM 10547B (REV 0, SHEET 2) 6.5

Tigercat 720C Feller Buncher

Electrical, Gauges and Alarms

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

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

START

DRIVE ENABLE

SAW

RELAY 3

RELAY 4

RELAY 5

DRIVE LOCK

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

30A 10 AC / HEATER

10A 4 FUEL 10A 5 RADIO / DOME

20A 11 LIGHTER 25A 12 F. LIGHTS

15A 6 BACK HORN 15A 7 ETHER

25A 13 R. LIGHTS 15A 14 HORN

RELAY 2

PILOT LOCK RELAY 1

8 AUX. 10A 9 AUX FAN

7834A

FUSE AND RELAY PANEL

6.6

Tigercat 720C Feller Buncher

720C-17

Electrical, Gauges and Alarms

INSTRUMENT PANEL WIRING DIAGRAM 1737D (REV 20) 6.7

Tigercat 720C Feller Buncher

Electrical, Gauges and Alarms

GAUGES AND ALARMS The 720C is monitored for proper operation by sensors located in the hydraulic system and on the engine. These sensors are connected to either gauges or warning lights.

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

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

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

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

SENSOR GAUGE FUNCTION RANGE LIGHT HORN Saw Circuit Pressure 0-5000 psi Engine hours 0-9999.9 Hydraulic oil temperature 100°F-240°F Engine oil pressure 0-100 psi Hydraulic oil low On-Off ON Engine coolant temperature 100°F-280°F Tachometer Volts Engine air cleaner Back-up alarm Warning Horn

0-3000 RPM

-

-

8v-18v Green-Red

-

-

-

-

ON ON

720CSENSORS.XLS

6.8

•

Engine Oil Pressure

•

Hydraulic Oil Temperature

•

Engine Coolant Temperature OHMETER TEST READINGS

INFORMATION Refer to SECTION 17 - SAW DRIVE Total running hours Stop machine above 180°F Stop engine below 15 psi Red light indicates 10 gallons below FULL Cummins - 190°F-210°F operating range John Deere - 180°F-202°F operating range Refer to THROTTLE CONTROL in SECTION 2 of the OPERATOR'S MANUAL Normal operation range 12-13.5 volts Green at high RPM - Filter OK Red at high RPM - Replace Filter Reverse Drive Pedal Switch on instrument panel

Tigercat 720C Feller Buncher

Electrical, Gauges and Alarms

SWITCH BACK-UP ALARM

• SWITCH PILOT SHUT OFF LEFT CAB DOOR

PARKING BRAKE PROXIMITY SENSOR

•

•

SWITCH PILOT SHUT OFF RIGHT CAB DOOR

•

HORN

•

SENDER COOLANT TEMPERATURE (LOCATION MAY VARY)

•

SWITCH BATTERY DISCONNECT

SENDER TACHOMETER

START SOLENOID RELAY

• SENDER ENGINE OIL PRESSURE SENDER ENGINE HOURS

SENDER HYDRAULIC OIL TEMPERATURE SENDER HYDRAULIC OIL LEVEL

• •

• •

•

•

•

•

BATTERIES

• BACK-UP ALARM

SENSOR & SWITCH LOCATIONS 9542B-R01

6.9

Tigercat 720C Feller Buncher

Electrical, Gauges and Alarms

6.10

Tigercat 720C Feller Buncher SECTION 7 - ENGINE JUNE 2000

CONTENTS - SECTION 7 CIRCUIT DESCRIPTION CUMMINS ENGINE ..................................................... 7.3 JOHN DEERE ENGINE ............................................... 7.3 COOLING SYSTEM COOLANT FLOW DIAGRAM ....................................... 7.8 COOLANT FLOW DURING OPERATION .................... 7.8 FILLING THE SYSTEM WITH COOLANT .................... 7.8 FUSES ............................................................................ 7.2 PARKING BRAKE ........................................................... 7.2 PRECLEANER OPERATION ................................................................ 7.9 SERVICE ..................................................................... 7.9 RELAYS AND FUSES ..................................................... 7.2 START CIRCUIT DIAGRAMS - CUMMINS 'B' ENGINE AT REST ...................................................................... 7.6 RUN AND DRIVE ......................................................... 7.7 RUN, NO DRIVE .......................................................... 7.7 START ......................................................................... 7.6 START CIRCUIT DIAGRAMS - JOHN DEERE ENGINE AT REST ...................................................................... 7.4 RUN AND DRIVE ......................................................... 7.5 RUN, NO DRIVE .......................................................... 7.5 START ......................................................................... 7.4 STARTING SYSTEM DESCRIPTION ............................. 7.2 TACHOMETER SET-UP .................................................. 7.8

Tigercat 720C Feller Buncher

Engine

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

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

IGNITION SWITCH

196-18A

• PROXIMITY SWITCH

FUSE AND RELAY PANEL (COVER REMOVED) 337-19

PARKING BRAKE "OFF" START

DRIVE ENABLE

SAW

RELAY 3

RELAY 4

RELAY 5

5A

8 AUX.

1 GAUGES

DRIVE LOCK RELAY 2

15A

10A

2 SAFETY

9 AUX FAN

10A

30A

3 CONTROLS

10 AC / HEATER

10A

20A

4 FUEL

11 LIGHTER

10A

337-20

5 RADIO/DOME

15A

15A

RELAY 1

7 ETHER

14 HORN

PARKING BRAKE "ON" POSITION

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

25A

PILOT LOCK

12 F. LIGHTS

15A

25A

6 BACK HORN

13 R. LIGHTS

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

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

197-5

7.2

CAB DOOR SWITCH

7834A

Tigercat 720C Feller Buncher

Engine CIRCUIT DESCRIPTION - CUMMINS ENGINE

CIRCUIT DESCRIPTION - JOHN DEERE ENGINE

With the parking brake ON, the parking brake proximity switch is closed and the drive enable relay is energized through wires 6 and 11. When the key is turned to the START position, voltage is supplied to the start circuit through wire 6 to the drive enable relay and wire 9 to the start relay.

With the parking brake ON, the parking brake proximity switch is closed and the drive enable relay is energized through wires 6 and 11. When the key is turned to the START position, voltage is supplied to the start circuit through wire 6 to the drive enable relay and wire 9 to the start relay.

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

When the parking brake is OFF, the drive enable relay is de-energized, voltage is not available in wire 9 and therefore the engine cannot be started.

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

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

There is a fuel control valve on the engine that is activated when the key is turned on. It has a pull in coil that is activated by the start solenoid and alternator through wire 69 during the start procedure and a holding coil activated through wire 13 during the start procedure and when the engine is running.

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

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

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

When the parking brake is OFF, the drive enable relay is de-energized, voltage is not available in wire 9 and therefore the engine cannot be started. This prevents accidental starting of the engine when the parking brake is OFF. It should be noted that with the engine running, the parking brake ON and the drive enable relay energized, voltage is not available in wire 66 to the drive prevent relay. Because of this, driving the machine is still not possible until both cab doors are closed and the pilot reset switch is pressed.

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

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

7.3

Tigercat 720C Feller Buncher

Engine

START CIRCUIT DIAGRAMS - JOHN DEERE ENGINE OPTION START CIRCUIT - AT REST

720C03

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

720C04

7.4

Tigercat 720C Feller Buncher

Engine

START CIRCUIT DIAGRAMS - JOHN DEERE ENGINE OPTION START CIRCUIT - RUN, NO DRIVE MASTER DISCONNECT - ON PARKING BRAKE - OFF PILOT RESET SW. - OFF IGNITION KEY - RUN (IGNITION)

720C05

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

720C06

7.5

Tigercat 720C Feller Buncher

Engine

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

720C-20

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

720C-21

7.6

Tigercat 720C Feller Buncher

Engine

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

720C-22

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

720C-23

7.7

Tigercat 720C Feller Buncher ENGINE COOLING SYSTEM

Engine radiator top tank.

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

COOLANT FLOW DURING OPERATION The water pump circulates coolant through the engine oil cooler, the engine block and cylinder head. If the thermostat is closed, coolant is returned to the water pump through a bypass inside the engine.

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

Coolant will flow out the top radiator hose through the thermostat bypass and into the engine once the lower chamber of the radiator has filled. The engine vent discharges air directly from the engine to the upper chamber of the radiator top tank.

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

The top tank of the engine radiator is divided by a baffle plate into two chambers, an upper and a lower. A small baffle vent tube is the only connection between these two chambers. The anti-freeze/water solution used in the cooling system always contains small amounts of air produced by combustion gas leakage. This air must be vented to the outside to prevent cavitation of the engine water pump and to promote efficient heat transfer between the engine block and the coolant. These gases separate from the coolant in the lower chamber of the radiator top tank and are carried up through the baffle vent tube where they collect in the upper chamber and eventually discharge through the pressure cap.

When the engine has been run up to operating temperature and the thermostat has opened, any remaining air is purged through the baffle vent tube and the engine vent. The system will then require more coolant to fully top off both the engine and the radiator.

An engine vent discharges air directly from the top of the engine to the upper chamber of the ENGINE VENT

BAFFLE VENT TUBE

THERMOSTAT (PARTIALLY OPEN)

UPPER CHAMBER LOWER CHAMBER

AFTER COOLER

CYLINDER HEAD

SHUNT LINE RADIATOR CORE

BYPASS

ENGINE BLOCK

720B-24

ENGINE OIL COOLER

WATER PUMP

COOLANT FLOW DURING OPERATION 7.8

BOTTOM TANK

Tigercat 720C Feller Buncher

Engine

PRECLEANER - ENGINE AIR INTAKE

TACHOMETER SET-UP

The precleaner is the first defense against foreign objects entering the air intake to the air cleaner filter elements and the engine. This unit draws its air supply through the perforated side engine door where the course outer screen blocks the passage of large particles such as leaves, twigs or pine needles. Inside the precleaner is a turbine fan which spins due to the passage of air over its blades. The blades direct large particles to the outside of the casing, where they are blown out the exhaust port area. The main air stream continues into the air filter assembly for removal of fine dust and particles.

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

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

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

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

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

Caterpillar Engine = 5/8 turn.

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

•

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

• •

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

•

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

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

ONLY THE PURIFIED AIR GOES TO THE AIR FILTER

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

PRECLEANER OPERATION

SERVICE

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

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

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

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

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

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

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

7.9

Tigercat 720C Feller Buncher

Engine

7.10

Tigercat 720C Feller Buncher SECTION 8 - DRIVE OCTOBER 2000

CONTENTS - SECTION 8 AXLES BRAKE BLEEDING ......................................................................................... 8.35 BRAKE LINING INSPECTION ........................................................................ 8.35 DIAGRAM - REAR AXLE ................................................................................ 8.34 DIFFERENTIAL LOCKS ................................................................................. 8.35 DRAINING THE AXLES .................................................................................. 8.36 FILLING THE AXLES ...................................................................................... 8.36 LUBRICATION ...................................................................................... 8.34, 8.36 OIL CAPACITIES ............................................................................................ 8.36 SERVICE BRAKES ......................................................................................... 8.35 CIRCUIT DIAGRAM EARLY MACHINES WITHOUT CREEP (7203001 TO 7203173) ..................... 8.19 LATER MACHINES WITH CREEP (720174 AND UP) .................................... 8.11 FOOT CONTROL VALVE ................................................................................... 8.10 FRONT DRIVE SHAFT DIAGRAM ....................................................................................................... 8.32 INSTALLATION IN TO MACHINE .................................................................... 8.31 PILLOW BLOCK BEARING ............................................................................ 8.31 HYDROSTATIC DRIVE MOTOR .......................................................................... 8.8 DESCRIPTION ................................................................................................. 8.8 DIAGRAM ......................................................................................................... 8.8 SCHEMATIC ..................................................................................................... 8.8 "X" DIMENSION .................................................................................... 8.16, 8.24 HYDROSTATIC DRIVE PUMP DESCRIPTION ................................................................................................. 8.4 DIAGRAM ......................................................................................................... 8.6 SCHEMATIC ..................................................................................................... 8.5 HYDROSTATIC DRIVE SYSTEM - CLOSED LOOP ............................................ 8.3 MIDDLE DRIVE SHAFT SLIP SPLINE LUBRICATION .......................................................................... 8.33 PRESSURE SETTINGS AND ADJUSTMENTS DRIVE MOTOR EARLY MACHINES WITHOUT CREEP (7203001 TO 7203173) ................ 8.24 LATER MACHINES WITH CREEP (720174 AND UP) ................................ 8.16 DRIVE PUMP EARLY MACHINES WITHOUT CREEP (7203001 TO 7203173) ................ 8.22 LATER MACHINES WITH CREEP (720174 AND UP) ................................ 8.14 TEST DRIVE EARLY MACHINES WITHOUT CREEP (7203001 TO 7203173) ..................... 8.21 LATER MACHINES WITH CREEP (720174 AND UP) .................................... 8.13 TRANSMISSION ................................................................................................ 8.30 WHEEL INSTALLATION ..................................................................................... 8.36

Tigercat 720C Feller Buncher

Drive

8.2

Tigercat 720C Feller Buncher

Drive A hydraulic system is termed closed loop when the hydraulic oil returning from the motor is fed straight back to the pump without first returning to tank. When the machine is travelling forward, one side of the closed loop is a high pressure supply while the other side is a low pressure return. The supply and return will alternate from side to side of the closed loop as the direction of travel of the vehicle goes from forward to reverse.

HYDROSTATIC DRIVE SYSTEM The primary components of the 720C hydrostatic drive system are a hydraulic pump and two hydraulic motors connected together by hydrostatic hoses. The pump converts the mechanical power of the diesel engine into hydraulic power. This high pressure flow of hydraulic oil is then transmitted to the hydraulic motors through the connecting hoses. The motors then reconvert the hydraulic power back into the mechanical power used to propel the machine.

Low pressure hydraulic oil flow then returns from the motors to the pump thereby completing a continuous closed loop hydraulic circuit.

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

BENT AXIS PISTON MOTOR

TO VEHICLE DRIVE

HIGH PRESSURE SUPPLY

SWASHPLATE, AXIAL PISTON PUMP

FROM DIESEL ENGINE

BENT AXIS PISTON MOTOR LOW PRESSURE RETURN

620-03

TO VEHICLE DRIVE

CONTINUOUS CLOSED LOOP HYDRAULIC CIRCUIT

8.3

Tigercat 720C Feller Buncher HYDROSTATIC DRIVE PUMP

Drive OPERATING DESCRIPTION The drive footpedal control valve directs oil from the charge pump and sends a pressure signal to shift the spool in the swashplate control valve.

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

The hydrostatic drive pump is mounted at the top center location of the pump drive gearbox. A spline adapter connects the input driveshaft of the pump directly to the output of the gearbox. The gearbox is driven directly by the diesel engine through a flexible plate coupling.

•• DOUBLE ELEMENT FILTERS

The drive foot control valve only functions when the parking brake lever is in the OFF position. This prevents the machine from being driven when the parking brake ON. A proximity sensor is attached to the parking brake lever. When this lever is in the OFF position, the proximity sensor contacts are open, de-energizing the drive enable relay and energizing the drive prevent valve. With the drive prevent valve energized, drive footpedal oil can be directed to either the forward or reverse side of the pump swashplate control valve as required.

With the drive prevent valve de-energized, drive footpedal oil is directed to both sides of the swashplate control valve, the valve does not move and the pump swashplate angle remains at zero (0o).

CHARGE PRESSURE FILTER

•• •

BOOM/STEER PUMP

••

•• RDOOR

DRIVE PUMP

SAW PUMP

PUMPS

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

The primary pump is a variable displacement, swashplate, axial piston type. This pump is made variable by slipping the pump pistons against a tiltable swashplate cradle. The volume and direction of oil flow from the piston pump is determined by the angle of this swashplate. When the swashplate is stroked to a maximum displacement angle, the piston pump will produce maximum flow in one direction in the closed loop.

As the swashplate is de-stroked the flow smoothly decreases until there is no flow at an angle of zero (0o). Continuing to angle the swashplate past this neutral position reverses the direction of flow from the piston pump.

The hydrostatic piston pump is equipped with a pressure override (POR) valve to protect the closed loop components from excessive pressure.

When the tractive effort requirements of the vehicle are demanding then pressure on the high side of the closed loop can reach maximum. At this pressure the POR valve signals the swashplate control valve to destroke the swashplate, reducing piston pump flow and maintaining system pressure at the POR setting.

The POR prevents continuous dumping of high pressure oil across the piston pump high pressure relief valves. This eliminates unnecessary heating of the oil and protects the pump and motor during rapid acceleration and deceleration or when the drive system stalls.

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

8.4

Tigercat 720C Feller Buncher

Drive

TO MOTORS (B)

TO MOTORS (A)

TO DRIVE PEDAL CONTROL VALVE POR VALVE

F R P

CHARGE PUMP RELIEF

HIGH PRESSURE RELIEF VALVE 'B'

HIGH PRESSURE RELIEF VALVE 'A'

SWASHPLATE CONTROL VALVE

CONTROL CYLINDER

HYDROSTATIC PUMP (PISTON)

CHARGE PUMP (GEAR)

CHARGE PRESSURE FILTER

Mb TEST PORT

AP8SC

DRIVE PUMP SCHEMATIC

8.5

Ma TEST PORT

Tigercat 720C Feller Buncher

DRIVE SHAFT

Drive

SWASHPLATE CONTROL VALVE PORT 'B'

CONTROL CYLINDER

CHARGE PUMP

PRESSURE OVERRIDE VALVE (POR)

CHARGE PUMP RELIEF 'B' PORT RELIEF

PORT 'B'

PORT 'A'

SPLINED SHAFT SWASHPLATE

AP008-1

CROSS SECTION THRU' PORT PLATE BODY

PORT 'A'

DRIVE PUMP

'A' PORT RELIEF

AP008-2

Excess charge pump oil is relieved by the charge pump relief valve back into the case of the piston pump. The charge pump pressure filter ensures that only clean charge pump oil is introduced into the closed loop hydrostatic circuit and the swashplate control system. Should this pressure filter become clogged with debris, charge pump flow is diverted to tank thus preventing the entry of unfiltered charge pump oil.

HYDROSTATIC DRIVE PUMP........cont'd The two high pressure relief valves at ‘A’ and ‘B’ ports are intended only to act as pressure limiting safety devices in the event that the POR valve malfunctions or does not respond quickly enough to high pressure surges. For this reason the high pressure relief valves are always adjusted higher than the POR valve setting. The high pressure relief valves always dump oil from the high pressure to the low pressure side of the closed loop thereby keeping the hydraulic oil within the closed loop.

The charge pump continuously introduces oil from the hydraulic tank back into the hydrostatic drive system. The charge pump relief valve maintains a constant charge pressure for use by the swashplate control system. In addition, the charge pump oil is used as make up oil to the low pressure side of the closed loop to replenish losses due to internal leakage in the hydrostatic pump and motor. This same flow acts as a cooling fluid for the piston pump and motors to ensure peak performance and long service life.

8.6

Tigercat 720C Feller Buncher

Drive

8.7

Tigercat 720C Feller Buncher HYDROSTATIC DRIVE MOTOR

Drive displacement control of the motor to the minimum setting. Removal of the pressure signal from the foot pedals will cause the displacement control spool to return to the neutral position, shutting off the pressure to the displacement control cylinder thus increasing displacement to maximum.

Two motors are used to drive the feller buncher.

They are mounted to the input side of the transmission. A splined coupling connects the motor shaft to the transmission input shaft.

Each motor is a variable displacement, bent axis piston type. The two motors form a closed loop circuit with the drive pump.

For later machines with a creep function: The displacement control spool is operated by pilot pressure via the creep solenoid operated pilot valve. When the creep switch is in the OFF position pilot oil is sent to the displacement control spool. The displacement control spool shifts against a spring and directs oil past the

High pressure oil from the drive 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.

FLUSHING VALVE

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

•

MAX

CONTROL CYLINDER

MIN

The angle of the pistons is variable and is changed by an internal control cylinder that receives high pressure oil via the MOTORS' pressure override valve (POR) and a displacement control spool.

POR

•

4000 PSI @ 2200 RPM

•

DISPLACEMENT CONTROL SPOOL

FROM PEDALS OR CREEP

For early machines without a creep function: The displacement control spool is operated by pilot pressure from the forward and reverse foot pedals. When sufficient pressure from the pedals is directed to the spool, it shifts against a spring and directs oil past the POR valve to the displacement control cylinder thus decreasing the

FROM PUMP

720C-24

FROM PUMP

DRIVE MOTOR SCHEMATIC

•

FLUSHING VALVE

•

ROTATING GROUP

PORT 'M1'

AQ010-5Y

'A'

•

PORT 'B'

•

PORT 'A'

BEGIN OF STROKE ADJUSTING SCREW PORT 'X'

•

• POR ADJUSTING SCREW

•

VIEW 'A'

•

AQ010-1

DRIVE SHAFT

DRIVE MOTOR ~ REXROTH (160CC SIZE) 8.8

MINIMUM DISPLACEMENT ADJUSTING SCREW

Tigercat 720C Feller Buncher

Drive

POR valve to the displacement control cylinder thus decreasing the displacement control of the motor to the minimum setting. When the creep switch is in the ON position removal of the pressure signal will cause the displacement control spool to return to the neutral position, shutting off the pressure to the displacement control cylinder thus increasing displacement to maximum.

The spool in the POR valve is moved by system pressure from the high pressure side of the loop.

When the POR spool moves as a result of high pressures it reduces the pressure directed to the displacement control cylinder. The reduced pressure will cause the displacement control piston to move. The point at which the displacement control spool begins to move is known as "begin of stroke set point" or "pressure override set point".

The MOTOR POR set point must be correctly set for the system to function properly. Refer to DRIVE MOTOR PRESSURE SETTINGS in THIS SECTION .

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

WARNING: Improper adjustment of Minimum displacement adjusting screw can result in motor and transmission failure due to overspeeding.

When installing a new motor always ensure stroke limiting screw is set correctly. Refer to SET MOTOR MINIMUM DISPLACEMENT, 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.

8.9

Tigercat 720C Feller Buncher DRIVE FOOT CONTROL VALVE

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

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

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

CONNECTOR

SOLENOID

SPOOL SECTION VALVE BLOCK

RR-13

PORT 1

DRIVE PILOT VALVE

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

•

5

• •

4

•

2

3

•

•

PORT 2 V-04

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

1

• • •

•

8 'P' PORT AU013-1

WORK PORTS 1 OR 2

SPOOL ARRANGEMENT

DRIVE PREVENT VALVE

AU013-2

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

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

8.10

Tigercat 720C Feller Buncher

Drive

NOTE: USE THIS CIRCUIT DIAGRAM AND PRESSURE SETTING PROCEDURES (LATER MACHINES - WITH CREEP) FOR EARLY MACHINES WHICH HAVE BEEN MODIFIED TO INCLUDE A CREEP FUNCTION. FOR OTHER EARLY MACHINES (WITHOUT CREEP) REFER TO CIRCUIT DIAGRAM AND PRESSURE SETTING PROCEDURES FOR EARLY MACHINES.

720C-8

DRIVE CIRCUIT WITH CREEP FUNCTION (LATER MACHINES - SERIAL NUMBERS 7203174 AND UP) 8.11

Tigercat 720C Feller Buncher

Drive

8.12

Tigercat 720C Feller Buncher TEST DRIVE LATER MACHINES (WITH CREEP)

Drive 'Mb'. Check the readings at 'LM1' and 'RM1' which should be 2000 psi (half of 'Mb').

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

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

2. Engine Horsepower Audit 3. Top Speed Control 4. Creep function.

5. Front and rear differential lock functions.

John Deere Engine Cummins Engine

1900-1950 RPM 2075-2125 RPM

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

Install 0 - 5,000 psi gauges at the 'LM1' and 'RM1' on the DRIVE MOTORS and a 0 - 10,000 psi gauge at the 'Mb' port of the DRIVE PUMP.

3. TOP SPEED CONTROL:

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

A. Turn ON both front and rear differential locks.

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

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

B. Drive the machine forward at top speed and adjust the throttle control so that the tachometer reads 2300 rpm at top speed.

IMPORTANT: Foot brake must only be applied for 5 -10 seconds followed each time by a minimum 20 second cool down period. Failure to do so will result in 'burn out' of the rear axle brake.

C. With the aid of an assistant drive the machine forward at top speed and record the time to complete 6 tire revolutions. This should take 9.5 seconds maximum.

1. MOTOR PRESSURE OVERRIDE (POR)

If it takes longer than 9.5 seconds the MOTOR minimum displacement, MOTOR POR (Begin of stroke) or PUMP charge pressure may be incorrectly set.

A. Turn ON both front and rear differential locks.

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

4. CREEP FUNCTION:

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

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

B. Set the throttle control to FULL and drive forward at full speed. The maximum speed should now be slow, approximately 1 - 1½ mph.

C. While doing the above, observe the pressure at 'Mb'. The reading should be 4000 psi (drive motor POR setting). Also observe the pressure readings at 'LM1' and 'RM1' which should be 2000 psi (half of 'Mb').

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

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

2. ENGINE HORSEPOWER AUDIT: A. Install the articulation lock bar to prevent the machine from steering.

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

B. Set the throttle control to FULL. Verify the tachometer reading at high idle: John Deere Engine: Cummins Engine:

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

2475-2525 RPM 2450-2500 RPM

C. Leave the throttle control set to FULL. Set the fan speed control to HIGH with the A/C switch OFF. Operate the accumulator CLOSE function and steer the machine.

C. Turn front differential lock switch OFF. D. Turn only the rear differential lock switch ON. While steering the machine, both rear wheels should slide instead of rotating. Front wheels should still rotate.

D. While doing the above, carefully drive the machine forward and apply the foot brake to develop a reading of 4000 psi pressure at 8.13

Tigercat 720C Feller Buncher DRIVE PUMP PRESSURE SETTINGS AND ADJUSTMENTS LATER MACHINES (WITH CREEP)

Drive articulation lock bar and shut off engine.

2. Adjust auxiliary brake set-up caliper to lock the rotating brake disc. Refer to illustrations to identify your caliper and the proper setting.

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

3. Connect a 0-1000 psi pressure gauge to the "capped" test port at the TEE connection from port 'G' on the drive pump. Connect 0-10000 psi pressure gauges to ports 'Ma' and 'Mb' on the drive pump.

NOTE: Relief valves are set by loosening the locknut and turning the adjusting screw OUT (counter-clockwise) to reduce the pressure setting and IN (clockwise) to increase the pressure setting.

4. Start the engine and set to FULL throttle. Set charge pressure relief valve to 450 psi at 'G'.

5. Install a limiting block under the foot pedal to limit its movement to 1/3 of its full travel. (The limiting block should measure approximately 1-5/8" high . If there is any difficulty setting pressures the size of the block may need to be reduced slightly.)

1. Park machine on level ground, lower felling head to the ground and set parking brake ON. The creep switch must be OFF. Install the

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

1-5/8"

ADJUST AUXILIARY BRAKE SET-UP CALIPER (ADJUSTING NUT) TO 70 LBF/FT.

189-10X

INSTALL A LIMITING BLOCK UNDER BOTH DRIVE PEDALS

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

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

•• 188-10

AUXILIARY BRAKE SET-UP CALIPER EARLIER MACHINES

ADJUST AUXILIARY BRAKE SET-UP CALIPER (ADJUSTING NUT) TO 110 LBF/FT.

7. Turn the pump pressure override valve (POR) adjusting screw IN (clockwise) until lightly seated. Do not over-tighten, or breakage will result. Turn the pump POR valve OUT (counter-clockwise) one half turn.

8. With the aid of an assistant hold down the brake pedal and while depressing the FORWARD drive pedal to 1/3 of its full travel set the pump high pressure relief valve 'B' at 'Mb' 5650-5700 psi at FULL throttle.

••

CAUTION 336-3AX

AUXILIARY BRAKE SET-UP CALIPER LATER MACHINES

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

8.14

Tigercat 720C Feller Buncher

Drive 11. With the aid of an assistant hold down the brake pedal and while depressing the FORWARD drive pedal fully adjust the pump POR valve to get a reading at 'Mb' of 5000-5050 psi at FULL throttle.

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

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

IMPORTANT

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

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

9. With the aid of an assistant hold down the brake pedal and while depressing the REVERSE drive pedal to 1/3 of its full travel set the pump high pressure relief valve 'A' at 'Ma' 5650-5700 psi at FULL throttle.

POR VALVE 4 mm ALLEN KEY 13 mm WRENCH

10. Remove the limiting block from under the forward and reverse footpedals.

•• 77-6

'TEE' GAUGE TEST PORT (G) • PORT SIZE - 04 JIC

DRIVE PUMP

••

CHARGE PRESSURE RELIEF • 5 mm ALLEN KEY • 17 mm WRENCH

HIGH PRESSURE RELIEF VALVE 'B'

••

5 mm ALLEN KEY 17 mm WRENCH

HIGH PRESSURE RELIEF VALVE 'A' 5 mm ALLEN KEY 17 mm WRENCH

•• 35010A

•• GAUGE TEST PORT 'Ma' • 3/16" ALLEN KEY • PORT SIZE - 04 ORB

DRIVE PUMP 8.15

•• GAUGE TEST PORT 'Mb' • 3/16" ALLEN KEY • PORT SIZE - 04 ORB

••

Tigercat 720C Feller Buncher DRIVE MOTOR PRESSURE SETTINGS AND ADJUSTMENTS LATER MACHINES (WITH CREEP)

Drive locknut to the end of the exposed screw is 19mm. (For different length screws, measure the length and subtract 71mm from this total length. This is the amount of screw that should be exposed above the locknut.) (For example: 100mm screw, minus 71mm will leave 29mm above locknut).

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

NOTE: Repeat for the other motor.

B. MOTOR PRESSURE OVERRIDE ADJUSTMENT (POR)

Perform this procedure on BOTH MOTORS.

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

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

Perform this procedure on BOTH MOTORS. 1. Park the machine on level ground, lower felling head to the ground and set parking brake ON. The creep switch must be OFF. Install articulation lock bar an shut off engine.

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

2. Adjust auxiliary brake set-up caliper to lock the rotating Brake disc. Refer to illustrations to identify your caliper and the proper setting.

3. Connect a 0-1000 psi pressure gauge to the "capped" test port at the TEE connection from port 'G' on the drive pump. Connect 0-10000 psi pressure gauges to ports 'Ma' and 'Mb' on the drive pump. Connect a 05000 psi pressure gauge to the 'LM1' and 'RM1' test ports on the motors.

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

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

4. Start the engine and set to FULL throttle. Set charge pressure relief valve to 450 psi at 'G'.

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

6. Disconnect the parking brake proximity sensor power wire form the sensor.

CAUTION

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

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

3. Reinstall the minimum displacement adjusting screw and locknut into the motor housing. For a 90mm long screw, it should be adjusted such that the dimension from the top of the

5. Turn the pump pressure override valve (POR) adjusting screw IN (clockwise) until lightly seated. Do not over-tighten, or breakage will result. Turn the pump POR valve OUT (counter-clockwise) one half turn.

"X"

DIM X

6. To set the motor pressure override adjustment (POR), it is necessary to temporarily adjust the drive pump pressure override to 4000-4025 psi.

MIN. DISPLACEMENT "X" DIMENSION 8.16

Tigercat 720C Feller Buncher MOTOR PRESSURE OVERRIDE ADJUSTING SCREW (POR)

Drive If the reading is HIGH; turn the motor POR adjusting screw OUT (counter-clockwise) until there is a correct reading of 2000-2500 psi (half of Mb) at 'RM1' or 'LM1'.

(SOME HOSES REMOVED FOR CLARITY)

If the reading is LOW ; turn the motor POR adjusting screw IN (clockwise) until there is a correct reading of 2000-2500 psi (half of Mb) at 'RM1' or 'LM1'.

• •

10. Release the forward drive pedal and reapply.

Ensure that both gauges ('LM1' and 'RM1') read 2000-2500 psi (half of Mb).

MINIMUM DISPLACEMENT ADJUSTING SCREW

11. To complete this procedure the drive pump POR must be reset.

DRIVE MOTOR

320-23

7. With the aid of an assistant hold down the brake pedal and while depressing the REVERSE drive pedal set the pump pressure override (POR) valve to a reading at 'Ma' of 4000-4025 psi at FULL throttle.

12. With the aid of an assistant hold down the brake pedal and while depressing the FORWARD drive pedal fully adjust the drive pump POR valve to get a reading at 'Mb' of 5000-5050 psi at FULL throttle.

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

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

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

8. With the aid of an assistant hold down the brake pedal and while depressing the FORWARD drive pedal adjust the motor pressure override to a reading of 2000-2500 psi (half of Mb) at 'RM1' or 'LM1'. This adjustment must be done for both motors.

15. Readjust auxiliary brake set-up caliper to its ORIGINAL POSITION (loose and locked).

Friction between the brake caliper and the rotating disc can cause a fire.

DRIVE MOTOR (160CC SIZE)

•

VIEW 'A'

•

PORT 'M1' • 6 ORB 1/4" ALLEN KEY

'A'

MOTOR POR ADJUSTING SCREW

8.17

•

BEGIN OF DISPLACEMENT ADJUSTING SCREW (DO NOT ADJUST) FOR REFERENCE ONLY: DIM. 'X' = 3/8" (9MM)

•

AQ010-1

PORT 'B'

•

PORT 'A'

MAXIMUM DISPLACEMENT ADJUSTING SCREW (DO NOT ADJUST) FOR REFERENCE ONLY: DIM. 'X' = 3/8" (9MM) FOR A 50MM LONG SCREW

AQ010-5Y

MINIMUM DISPLACEMENT ADJUSTING SCREW - 6MM ALLEN KEY - 19MM WRENCH DIM. 'X' = 3/4" (19MM) FOR A 90MM LONG SCREW

Tigercat 720C Feller Buncher

Drive

8.18

Tigercat 720C Feller Buncher

Drive

NOTE: SOME EARLY MACHINES HAVE BEEN UPDATED TO INCLUDE A CREEP FUNCTION. FOR THESE MACHINES PLEASE REFER TO CIRCUIT DIAGRAM AND PRESSURE SETTING PROCEDURES FOR LATER MACHINES (WITH CREEP).

720C-25

DRIVE CIRCUIT WITHOUT CREEP FUNCTION (EARLY MACHINES - SERIAL NUMBERS 7203001 TO 7203173) 8.19

Tigercat 720C Feller Buncher

Drive

8.20

Tigercat 720C Feller Buncher TEST DRIVE - EARLY MACHINES

Drive 2. MOTOR PRESSURE OVERRIDE (POR)

(WITHOUT CREEP FUNCTION)

A. Turn ON both front and rear differential locks.

Set the throttle control to FULL.

This test drive will verify the following: 1. Begin of displacement control pressure.

2. Motor pressure override.

3. Top Speed Control.

4. Front and rear differential lock functions.

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

Connect two 0 - 5,000 psi gauges to ports 'LM1' and 'RM1' on the drive motors. Connect one 0-10,000 psi gauge at the 'Mb' port of the drive pump.

C. While doing the above, observe the pressure at 'Mb'. The reading should be 4000 psi (drive motor POR setting). Also observe the pressure readings at 'LM1' and 'RM1' which should be 2000 psi (half of 'Mb').

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

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

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

3. TOP SPEED CONTROL: A. Turn ON both front and rear differential locks.

Set the throttle control to FULL.

IMPORTANT: Foot brake must only be applied for 5 -10 seconds followed each time by a minimum 20 second cool down period. Failure to do so will result in 'burn out' of the rear axle brake.

B. Drive the machine forward at top speed and adjust the throttle control so that the tachometer reads 2300 rpm at top speed.

1. BEGIN OF DISPLACEMENT CONTROL PRESSURE

C. With the aid of an assistant drive the machine forward at top speed and record the time to complete 6 tire revolutions. This should take 9.5 seconds maximum.

A. Turn ON both front and rear differential locks.

Set throttle control to FULL. B. Drive the machine FORWARD, using the foot pedal, to get 150 psi at ‘X’.

If it takes longer than 9.5 seconds the MOTOR minimum displacement, MOTOR begin of displacement control pressure, MOTOR pressure override (POR) or PUMP charge pressure may be incorrectly set.

The foot brakes may have to be applied to create approximately 2000 psi at ‘Mb’ on the pump.

4. DIFFERENTIAL LOCK FUNCTIONS:

C. While doing the above, observe the two ‘M1’ gauges and adjust forward foot pedal, up or down until a reading of 1000 psi (half of ‘Mb’) just starts to appear on both the ‘LM1’ and 'RM1' gauges. Read the ‘X’ pressure gauge which is showing the begin of displacement pressure and it should be 145-155 psi. Both motors (‘LM1’ and 'RM1' gauges) should rise to 1000 psi within the 145-155 psi range on the ‘X’ gauge, if the set-up is correct.

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

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

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

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

C. Turn front differential lock switch OFF. D. Turn only the rear differential lock switch ON. While steering the machine, both rear wheels should slide instead of rotating. Front wheels should still rotate.

8.21

Tigercat 720C Feller Buncher DRIVE PUMP PRESSURE SETTINGS AND ADJUSTMENTS EARLY MACHINES (WITHOUT CREEP)

Drive 2. Adjust auxiliary brake set-up caliper to lock the rotating brake disc. Refer to illustrations to identify your caliper and the proper setting.

3. Connect one 0-1000 psi pressure gauge to the TEE connection from port 'G' on the drive pump. Connect two 0-10000 psi pressure gauges to ports 'Ma' and 'Mb' on the drive pump. Connect one 0-1000psi gauge to the 'X' test port on right hand motor.

NOTE: Ensure hydraulic oil is at operating temperature. Refer to HYDRAULIC OIL HEATING PROCEDURE in SECTION 5 of THIS MANUAL. NOTE: Relief valves are set by loosening the locknut and turning the adjusting screw OUT (counter-clockwise) to reduce the pressure setting and IN (clockwise) to increase the pressure setting.

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

CAUTION

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

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

WARNING

5. Start the engine and set to FULL throttle.

6. Set charge pressure relief valve to a reading of 450 psi at 'G'.

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

ADJUST AUXILIARY BRAKE SET-UP CALIPER (ADJUSTING NUT) TO 70 LBF/FT.

• • REVERSE LIMITING SCREW

FORWARD LIMITING SCREW

FORWARD AND REVERSE DRIVE PEDALS 7. To set the drive pump high pressure reliefs it is necessary to temporarily achieve a 150-155 psi pressure reading at 'X' for both FORWARD and REVERSE. This is done by adjusting the limiting screws on the forward and reverse pedals.

189-10

•• 188-10

AUXILIARY BRAKE SET-UP CALIPER EARLIER MACHINES

Adjust the REVERSE drive pedal stroke limiting screw UPWARDS to limit the stroke of the pedal. With the aid of an assistant, hold down the brake pedal and while fully depressing the REVERSE foot pedal, observe the pressure reading at 'X'. It must read 150155 psi @ FULL throttle for 15 seconds, to ensure that it is correct. Repeat for FORWARD drive pedal.

ADJUST AUXILIARY BRAKE SET-UP CALIPER (ADJUSTING NUT) TO 110 LBF/FT.

••

336-3AX

8. Turn the drive pump pressure override valve (POR) adjusting screw IN (clockwise) until lightly seated. Do not over-tighten, or breakage will result. Turn the pump POR valve OUT (counter-clockwise) one half turn.

AUXILIARY BRAKE SET-UP CALIPER LATER MACHINES 8.22

Tigercat 720C Feller Buncher

Drive With the aid of an assistant, hold down the brake pedal and while fully depressing the reverse foot pedal, observe the pressure reading at 'X'. It must read 450-460 psi at FULL throttle (the save value as charge pressure) for 15 secconds to ensure that the reading is correct.

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

IMPORTANT

Repeat for the forward drive pedal.

12. With the aid of an assistant hold down the brake pedal and while depressing the FORWARD drive pedal fully adjust the drive pump POR valve to get a reading at 'Mb' of 5000-5050 psi at FULL throttle.

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

9. With the aid of an assistant hold down the brake pedal and while depressing the FORWARD drive pedal set the pump high pressure relief valve 'B' at 'Mb' 5650-5700 psi at FULL throttle.

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

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

CAUTION

15. Readjust auxiliary brake set-up caliper to its ORIGINAL POSITION (loose and locked).

Friction between the brake caliper and the rotating disc can cause a fire.

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

10. With the aid of an assistant hold down the brake pedal and while depressing the REVERSE drive pedal set the pump high pressure relief valve 'A' at 'Ma' 5650-5700 psi at FULL throttle.

POR VALVE 4 mm ALLEN KEY 13 mm WRENCH

11. Readjust the limiting screws on the forward and reverse pedals to get a reading of 450460 psi at 'X' for both forward and reverse.

•• 'TEE' GAUGE TEST PORT (G) • PORT SIZE - 04 JIC

CHARGE PRESSURE RELIEF • 5 mm ALLEN KEY • 17 mm WRENCH

DRIVE PUMP

77-6

••

GAUGE TEST PORT 'Ma' • 3/16" ALLEN KEY • PORT SIZE - 04 ORB GAUGE TEST PORT 'Mb' • 3/16" ALLEN KEY • PORT SIZE - 04 ORB

HIGH PRESSURE RELIEF VALVE 'B' HIGH PRESSURE RELIEF VALVE 'A' 5 mm ALLEN KEY 17 mm WRENCH

••

5 mm ALLEN KEY 17 mm WRENCH

••

••

•• 350-10A

DRIVE PUMP 8.23

••

Tigercat 720C Feller Buncher DRIVE MOTOR PRESSURE SETTINGS AND ADJUSTMENTS EARLY MACHINES (WITHOUT CREEP)

Drive A. MOTOR MINIMUM DISPLACEMENT ADJUSTMENT NOTE: Ensure hydraulic oil is at operating temperature. Refer to HYDRAULIC OIL HEATING PROCEDURE in THIS SECTION of the manual.

To set the hydrostatic drive motor pressures and speeds, the following procedure must be performed in the order shown.

Perform this procedure on BOTH MOTORS.

A. Set the motor minimum displacement.

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

B. Set the motor begin of displacement control pressure.

C. Set the motor pressure override.

IMPORTANT WARNING

The adjustment or set-up procedure is a series of steps that must be done in a proper sequence to achieve optimum performance from the machine. Any deviation from the procedures could present a safety hazard, damage components and/or affect the operation of the machine. All adjustments must be performed on BOTH MOTORS.

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

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

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

"X"

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

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

MOTOR PRESSURE OVERRIDE ADJUSTING SCREW (POR)

DIM X

3. Reinstall the minimum displacement adjusting screw and locknut into the motor housing. For a 90mm long screw, it should be adjusted such that the dimension from the top of the locknut to the end of the exposed screw is 19mm. (For different length screws, measure the length and subtract 71mm from this total length. This is the amount of screw that should be exposed above the locknut.) (For example: 100mm screw, minus 71mm will leave 29mm above locknut).

(SOME HOSES REMOVED FOR CLARITY) MINIMUM DISPLACEMENT ADJUSTING SCREW

• • • BEGIN OF DISPLACEMENT ADJUSTING SCREW 320-23

MIN. DISPLACEMENT "X" DIMENSION

NOTE: Repeat for the other motor.

DRIVE MOTOR

8.24

Tigercat 720C Feller Buncher

Drive B. MOTOR BEGIN OF DISPLACEMENT CONTROL PRESSURE ADJUSTMENT

ADJUST AUXILIARY BRAKE SET-UP CALIPER (ADJUSTING NUT) TO 70 LBF/FT.

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

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

••

2. Adjust auxiliary brake set-up caliper to lock the rotating Brake disc. Refer to illustrations to identify your caliper and the proper setting.

AUXILIARY BRAKE SET-UP CALIPER EARLIER MACHINES

188-10

ADJUST AUXILIARY BRAKE SET-UP CALIPER (ADJUSTING NUT) TO 110 LBF/FT.

3. Connect one 0-1000 psi pressure gauge to the TEE connection from port 'G' on the drive pump. Connect two 0-10000 psi pressure gauges to ports 'Ma' and 'Mb' on the drive pump. Connect one 0-1000psi gauge to the 'X' test port on right hand motor. Connect two 0-5000 psi pressure gauges to the 'LM1' and 'RM1' test ports on the motors.

•

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

336-3AX

CAUTION

AUXILIARY BRAKE SET-UP CALIPER LATER MACHINES

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

DRIVE MOTOR (160CC SIZE)

•

VIEW 'A'

•

PORT 'M1' • 6 ORB 1/4" ALLEN KEY

MAXIMUM DISPLACEMENT ADJUSTING SCREW (DO NOT ADJUST) FOR REFERENCE ONLY: DIM. 'X' = 3/8" (9MM) FOR A 50MM LONG SCREW

'A'

PORT 'B'

BEGIN OF DISPLACEMENT ADJUSTING SCREW -3MM ALLEN KEY - 10 MM WRENCH

• •

AQ010-1

MOTOR POR ADJUSTING SCREW

8.25

•

PORT 'A'

AQ010-5Y

MINIMUM DISPLACEMENT ADJUSTING SCREW - 6MM ALLEN KEY - 19MM WRENCH DIM. 'X' = 3/4" (19MM) FOR A 90MM LONG SCREW

Tigercat 720C Feller Buncher

Drive

5. Start the engine and set to FULL throttle.

MOTOR PRESSURE OVERRIDE ADJUSTING SCREW (POR)

6. To set the motor begin of displacement control pressure, it is necessary to temporarily adjust the drive pump pressure override (POR) to 4000-4025 psi.

(SOME HOSES REMOVED FOR CLARITY) MINIMUM DISPLACEMENT ADJUSTING SCREW

• • •

POR VALVE 4 mm ALLEN KEY 13 mm WRENCH

BEGIN OF DISPLACEMENT ADJUSTING SCREW 320-23

b. With the aid of an assistant, hold down the brake pedal and while fully depressing the FORWARD pedal, adjust the stroke limiting screw (located under the pedal) upwards to limit the stroke of the reverse pedal and give a reading of 155 psi at 'X' for 15 seconds.

•• 77-6

DRIVE MOTOR

DRIVE PUMP

7. With the aid of an assistant hold down the brake pedal and while depressing the REVERSE drive pedal set the drive pump pressure override (POR) valve to a reading at 'Ma' of 4000-4025 psi at FULL throttle.

Note: Notice the difference in pressures for the forward and reverse pedals. These settings are important.

10. With the aid of an assistant, hold down the brake pedal and while fully depressing the FORWARD foot pedal, adjust the motor begin of displacement screw to give a reading at 'RM1' and 'LM1' of 2000-2500 psi at FULL throttle. This is very difficult to do and takes a little patience. The screw is VERY sensitive. Get as close as possible. Use two gauges and set BOTH MOTORS moving back and forth between the tow motors.

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

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

If the reading is HIGH; turn the motor begin of displacement adjusting screw OUT (counterclockwise) until a correct reading at 'RM1' and 'LM1' is obtained with the locknut tightened.

8. Turn the motor pressure override valve (POR) adjusting screw IN (clockwise) until lightly seated. Do not overtighten. Do this for both motors.

If the reading is LOW; turn the motor begin of displacement adjusting screw IN (clockwise) until a correct reading at 'RM1' and 'LM1' is obtained with the locknut tightened.

9. To set the motor begin of displacement control pressure, it is also necessary to temporarily achieve pressure readings of 145 & 155 psi pressure reading at 'X'. See steps below.

Recheck frequently while adjusting by having an assistant release and depress pedals.

a. With the aid of an assistant, hold down the brake pedal and while fully depressing the REVERSE pedal, adjust the stroke limiting screw (located under the pedal) upwards to limit the stroke of the reverse pedal and give a reading of 145 psi at 'X' for 15 seconds.

NOTE: These settings are turn on/turn off points and should not be confused with pressure settings.

11. With the aid of an assistant, hold down the brake pedal and while fully depressing the REVERSE foot pedal (set to 145 psi at 'X') the motors SHOULD NOT STROKE and a low reading of 800 psi or less should be obtained at 'LM1' and 'RM1'.

8.26

Tigercat 720C Feller Buncher

Drive

12. With the aid of an assistant, hold down the brake pedal and while fully depressing the FORWARD foot pedal (set to 155psi at 'X') the motors SHOULD STROKE and a high reading of 2000 or higher should be obtained at 'LM1' and 'RM1'.

C. MOTOR PRESSURE OVERRIDE (POR) ADJUSTMENT NOTE: Ensure hydraulic oil is at operating temperature. Refer to HYDRAULIC OIL HEATING PROCEDURE in THIS SECTION of the manual.

13. If these readings are obtained then the motor begin of displacement setpoint is now between 145-155 psi on both motors.

Perform this procedure on BOTH MOTORS. Note: Steps 1 to 7 were completed in BEGIN OF DISPLACEMENT . If this procedure was just finished move to step 8.

If not then repeat steps 10 to 12 until a correct setpoint is achieved.

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

When properly set the motors will begin to stroke in the pressure range of 145-155 psi.

This is a critical setting for the smooth and efficient operation of the machine.

2. Adjust auxiliary brake set-up caliper to lock the rotating Brake disc. Refer to illustrations to identify your caliper and the proper setting.

15. Check both motors to verify that this setting did not changed as the locknuts were tightened.

3. Connect one 0-1000 psi pressure gauge to the TEE connection from port 'G' on the drive pump. Connect two 0-10000 psi pressure gauges to ports 'Ma' and 'Mb' on the drive pump. Connect one 0-1000psi gauge to the 'X' test port on right hand motor. Connect two 0-5000 psi pressure gauges to the 'LM1' and 'RM1' test ports on the motors.

16. To complete this procedure the drive motor POR must be reset. Refer to MOTOR PRESSURE OVERRIDE (POR) ADJUSTMENT in THIS SECTION. ADJUST AUXILIARY BRAKE SET-UP CALIPER (ADJUSTING NUT) TO 70 LBF/FT.

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

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

• 188-10

AUXILIARY BRAKE SET-UP CALIPER EARLIER MACHINES

5. Start the engine and set to FULL throttle.

ADJUST AUXILIARY BRAKE SET-UP CALIPER (ADJUSTING NUT) TO 110 LBF/FT.

6. To set the motor pressure override adjustment (POR), it is necessary to temporarily adjust the drive pump pressure override to 40004025 psi.

POR VALVE 4 mm ALLEN KEY 13 mm WRENCH

•

336-3AX

AUXILIARY BRAKE SET-UP CALIPER LATER MACHINES

•• 77-6

8.27

DRIVE PUMP

Tigercat 720C Feller Buncher

Drive

7. With the aid of an assistant hold down the brake pedal and while depressing the REVERSE drive pedal set the pump pressure override (POR) valve to a reading at 'Ma' of 4000-4025 psi at FULL throttle.

MOTOR PRESSURE OVERRIDE ADJUSTING SCREW (POR)

(SOME HOSES REMOVED FOR CLARITY) MINIMUM DISPLACEMENT ADJUSTING SCREW

•

CAUTION

•

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

• BEGIN OF DISPLACEMENT ADJUSTING SCREW

8. Readjust the limiting screws on the forward and reverse pedals to get a reading of 450460 psi at 'X' for both forward and reverse.

320-23

With the aid of an assistant, hold down the brake pedal and while fully depressing the reverse foot pedal, observe the pressure reading at 'X'. It must read 450-460 psi at FULL throttle (the save value as charge pressure) for 15 secconds to ensure that the reading is correct.

DRIVE MOTOR

10. Release the forward drive pedal and reapply.

Ensure that both gauges ('LM1' and 'RM1') read 2000-2500 psi (half of Mb).

11. To complete this procedure the drive pump POR must be reset.

12. With the aid of an assistant hold down the brake pedal and while depressing the FORWARD drive pedal fully adjust the drive pump POR valve to get a reading at 'Mb' of 5000-5050 psi at FULL throttle.

Repeat for the forward drive pedal.

9. With the aid of an assistant hold down the brake pedal and while depressing the FORWARD drive pedal adjust the motor pressure override to a reading of 2000-2500 psi (half of Mb) at 'RM1' or 'LM1'. This adjustment must be done for both motors.

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

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

If the reading is HIGH; turn the motor POR adjusting screw OUT (counter-clockwise) until there is a correct reading of 2000-2500 psi (half of Mb) at 'RM1' or 'LM1'.

15. Readjust auxiliary brake set-up caliper to its ORIGINAL POSITION (loose and locked).

Friction between the brake caliper and the rotating disc can cause a fire.

If the reading is LOW ; turn the motor POR adjusting screw IN (clockwise) until there is a correct reading of 2000-2500 psi (half of Mb) at 'RM1' or 'LM1'.

8.28

Tigercat 720C Feller Buncher TRANSMISSION

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

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

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

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

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

FILL PLUG

•

TRANSMISSION OIL LEVEL CHECK

•

337-9

CHECK TRANSMISSION OIL LEVEL

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

432-1

TRANSMISSION SHOWN ENGAGED

432-3

TRANSMISSION SHOWN IN NEUTRAL 8.29

Tigercat 720C Feller Buncher

Drive

Assembly and installation of a front drive shaft assembly.

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

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

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

FRONT DRIVE SHAFT

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

FRONT DRIVE SHAFT AND PILLOW BLOCK BEARING INSTALLATION IN TO MACHINE: 1. Install front drive shaft and pillow block bearing first. Attach front universal, leave pillow block mounting bolts loose and attach grease line.

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

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

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

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

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

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

IMPORTANT

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

2. Slide the old pillow block bearing off of the driveshaft.

3. Remove the set screws supplied with the bearing and discard.

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

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

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

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

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

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

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

3. Install the new set screw (Tigercat Part No. 2990A) lining it up with the slot in the shaft.

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

NOTE: DO NOT use a power greaser.

8.30

Tigercat 720C Feller Buncher

Drive

FRONT AXLE

GREASE LINE

SET SCREW PILLOW BLOCK BEARING

FRONT DRIVE SHAFT

YOKE RETAINING NUT

UNIVERSALS

SLIP SPLINE SPLINES

YOKE

TRANSMISSION REAR OUTPUT YOKE

FLAT WING OF YOKE SLIP SPLINE SEAL

MID DRIVE SHAFT

TRANSMISSION FRONT OUTPUT YOKE REAR AXLE

REAR DRIVE SHAFT

8252BIL

DRIVE SHAFT INSTALLATION 8.31

GREASE FITTING

Tigercat 720C Feller Buncher MID DRIVE SHAFT

Drive

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

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

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

Set parking brake ON. 2. Stop the engine. Turn the ignition key and the pilot reset switch to the on position. Relieve any pilot system pressure by pumping the brake pedal, and at the same time moving the steer joystick from left to right until the brake pedal becomes “stiff” and the steer joystick “softens”.

GREASE APPEARS AT PRESSURE RELIEF HOLE

•

3. Apply grease to the mid drive shaft grease nipple until new, clean grease appears at pressure relief hole in end plate at yoke end of slip spline. Refer to illustration “A”.

4. Cover the pressure relief hole with a finger and continue to apply pressure to grease nipple, until new, clean grease appears at slip spline seal. Refer to illustration "B".

720C-01

A. YOKE END OF SLIP SPLINE

GREASE GUN

• GREASE APPEARS AT SLIP SPLINE SEAL

•

COVER RELIEF HOLE WITH FINGER

•

720C-02

B. MID DRIVE SHAFT SLIP SPLINE LUBRICATION 8.32

Tigercat 720C Feller Buncher AXLES

Drive

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

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

DRAIN (TOP)

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

DIFF. LOCK (BTM.)

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

FRONT AXLE

26KSM

DIFF. LOCK (BTM.)

BRAKE

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

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

DRAIN (TOP)

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

1

REAR AXLE 27KSM

AXLE HYDRAULIC CONNECTIONS

2 4

6

7

3

5 AXL-3

AXLE ASSEMBLY CROSS SECTION (REAR SHOWN) 8.33

Tigercat 720C Feller Buncher

Drive

DIFFERENTIAL AND DIFFERENTIAL LOCKS

BRAKE LINING INSPECTION (REAR AXLE ONLY)

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

Inspection ports are provided in the differential case and are located on each side of the pivot boss when viewed from the opposite side of the input shaft. Before inspecting the brakes the axle must be drained. Refer to DRAINING THE AXLES in THIS SECTION.

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

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

•

Remove brake inspection port plugs.

•

Inspect brake linings on both sides of disc.

•

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

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

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

SERVICE BRAKES (REAR AXLE ONLY) The "wet" disc type service brakes consist of an annular piston, a brake disc with brake facing material, and a brake backing plate. One brake assembly is located on each side of the differential case and before the final drive.

SINGLE BRAKE LINE ACTUATES BOTH BRAKES IN REAR AXLE

BLEED SCREWS

SINGLE BRAKE PEDAL

BRAKE DISC BACKING PLATE

REAR AXLE ASSEMBLY

AXL-BRK1

ANNULAR PISTON

DUAL BRAKES (REAR AXLE)

PROCEDURE 1. Place parking brake ON.

AXL-BRK

ANNULAR BRAKE

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

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

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

When the brake foot control pedal in the cab is depressed, brake pressure oil moves the piston up against the brake disc and traps it between the piston and the backing plate to apply the brakes.

Maximum operating pressure for the brakes is 1000 psi. For information on the hydraulic circuit, refer to SECTION 9 of THIS MANUAL.

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

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

7. Release brake foot pedal.

8. Repeat above steps for the other bleed screw.

8.34

Tigercat 720C Feller Buncher

Drive

AXLE LUBRICATION

WHEEL INSTALLATION

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

NOTE: All wheel installation joints and surfaces should be clean, flat surfaces (free of paint, grease and oil etc.) using grade 8 bolts, hardened washers and standard torque practices.

•

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

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

MIN. FULL THREAD

2.17" .79"

.06" x 45°

.406" DRILL

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

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

20°

2.64" 3.41"

IMPORTANT AXL-WHL

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

TAPERED ASSEMBLY STUD

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

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

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

•

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

•

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

•

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

•

Remove assembly studs and install the remaining bolts.

•

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

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

IMPORTANT

CAPACITIES

If an air wrench is used, be sure that the wheel bolts are first hand-engaged to prevent stripping. Operate the wrench slowly to prevent damage to the threads.

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

8.35

Tigercat 720C Feller Buncher

Drive

8.36

Tigercat 720C Feller Buncher SECTION 9 - BRAKES AND DIFFERENTIAL LOCKS AUGUST 2000

CONTENTS - SECTION 9 AUXILIARY SET-UP CALIPER ............................................................................................ 9.4 BRAKES BRAKE ACCUMULATOR ................................................................................................. 9.2 CIRCUIT DESCRIPTION ................................................................................................. 9.2 CIRCUIT DIAGRAM ......................................................................................................... 9.3 FOOT CONTROL VALVE ................................................................................................. 9.2 DIFFERENTIAL LOCKS CIRCUIT DESCRIPTION ................................................................................................. 9.2 CIRCUIT DIAGRAM ......................................................................................................... 9.3 PARKING BRAKE ............................................................................................................... 9.4 AUXILIARY SET-UP CALIPER ......................................................................................... 9.4 BRAKE CALIPER ASSEMBLY EARLIER MACHINES ..................................................... 9.6 BRAKE CALIPER ASSEMBLY LATER MACHINES ......................................................... 9.6 CALIPER FLOAT ADJUSTMENT (LATER MACHINES) ................................................... 9.7 CHECKING FOR PROPER ADJUSTMENT .................................................................... 9.5 LINING REPLACEMENT(LATER MACHINES) ................................................................ 9.7

Tigercat 720C Feller Buncher

Brakes and Differential Locks

BRAKE COMPONENTS

BRAKE ACCUMULATOR

For information on bleeding lines, inspecting brake linings and integral parts of the disc brakes, refer to SECTION 8 of THIS MANUAL.

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

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

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

••

CIRCUIT DESCRIPTIONS A 213-20

BRAKE CIRCUIT

BRAKE PEDAL

BRAKE FOOT CONTROL VALVE This pilot valve is a manually operated directional valve and operates on the same principle as a pressure reducing valve.

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

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

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

The differential locks in both the front and rear axles are controlled switches. The rear differential lock switch is located on the control panel in the cab. The front differential lock switch is located on the left hand (steering) joystick. The switches control two solenoid operated pilot valves in ports 'C1' (rear) and 'C5' (front) of the pilot manifold.

Placing the front or rear differential lock switch in the ON position energizes the solenoid operated pilot valve which directs pilot oil to the differential lock clutch packs in the corresponding axle to lock the differentials. Refer also to AXLESDIFFERENTIAL LOCKS in SECTION 8 of THIS MANUAL.

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

T A P

MO-02 MO-01

A fixed displacement pump supplies oil to the accumulator charge valve. This valve directs oil to the brake accumulator through a check valve located between the pilot and brake accumulators. The oil from the brake accumulator side of the check valve is sent to the brake foot control valve to operate the rear axle brakes.

CROSS SECTION OF VALVE BODY

BRAKE FOOT CONTROL VALVE

9.2

Tigercat 720C Feller Buncher

720C-09

Brakes and Differential Locks

BRAKE AND DIFFERENTIAL LOCK CIRCUITS 9.3

Tigercat 720C Feller Buncher

Brakes and Differential Locks Pulling up on the lever engages the disc brake caliper and closes the proximity sensor mounted on the side of the parking brake lever. The proximity sensor activates the drive prevent circuit, to prevent the machine from being driven when the parking brake is ON. Pushing down on the lever releases the brake.

PARKING BRAKE The parking brake lever is located beside the operator’s seat. It is connected by a cable to a disc brake caliper assembly mounted on the output shaft of the transmission.

The parking brake lever operates ONE of TWO disc brake calipers on the transmission output shaft.

The SECOND, AUXILIARY SET-UP CALIPER is used for hydraulic set-up procedures only. When the auxiliary set-up caliper is not being used the adjusting nut should be loose with the jam nut tightened against it. Friction between the brake caliper and the rotating disc can cause a fire.

Refer to individual set-up procedures for further information on the use of the auxiliary brake setup caliper.

ADJUST AUXILIARY BRAKE SET-UP CALIPER (ADJUSTING NUT) TO 70 LBF/FT.

•

PARKING BRAKE PROXIMITY SENSOR 337-21

188-10

There are two ways to adjust the parking brake to compensate for wear. The first is to use the adjusting knob on the end of the parking brake lever. The second is to adjust the cable clevis at the caliper end of the brake cable.

AUXILIARY BRAKE SET-UP CALIPER EARLIER MACHINES

ADJUST AUXILIARY BRAKE SET-UP CALIPER (ADJUSTING NUT) TO 110 LBF/FT.

••

336-3AX

AUXILIARY BRAKE SET-UP CALIPER LATER MACHINES

9.4

Tigercat 720C Feller Buncher

Brakes and Differential Locks

CHECKING FOR PROPER PARKING BRAKE ADJUSTMENT

PARKING BRAKE ADJUSTMENTS Lever end:

The parking brake is properly adjusted when: A. Resistance is encountered half way through the brake lever’s travel.

Turn the knob on the end of the brake lever to increase or decrease braking effect. (Set screw on side of adjusting knob will lock setting)

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

Caliper end: Remove the cotter pin and clevis pin. Loosen the jamnut and thread the clevis on of off the cable to change the cable length. Tighten the jam nut .

The jamnut should provide ¼" of preload to the spring. Replace the clevis pin and cotter pin.

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

WARNING

Proximity sensor:

Drive prevent proximity sensor must be reconnected immediately after testing is completed.

Check to see that this sensor will activate the drive prevent circuit. This sensor can be adjusted by loosening the two jam nuts and adjusting the location of the sensor.

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

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

BRAKE CABLE

WASHER (2)

SPRING

CLEVIS NUT (3)

•

COTTER PIN

•

CLEVIS PIN

•

•

•

•

• CALIPER ASSEMBLY

720C-PB5

ADJ. NUTS PARKING BRAKE LEVER

• • •

• • •

• DISC

•

LOCKING SET SCREW

•

CLEVIS PROXIMITY SENSOR

TRANSMISSION LEVER PARKBRK5

•

PARKING BRAKE ASSEMBLY 9.5

• 720C-PB1

Tigercat 720C Feller Buncher

Brakes and Differential Locks

PAD AND HOLDER ASSEMBLY

SPRING

• •

SPRING (2)

•

•

COTTER PIN

•

BOLTS (2)

•

CARRIER SIDE CASTING

•

CAM

•

CASTLE NUT

•

•

•

•

• •

LEVER

PUSH PIN (2)

CAM SIDE CASTING

SEAL (2)

BOLT

BRAKE CALIPER ASSEMBLY EARLIER MACHINES

720C-PB2

REAR CALIPER TORQUE PLATE CARRIER AND LINING ASSEMBLY

CENTER ADJUSTING BOLT

CALIPER MOUNTING NUTS (2)

•

•

• • •

CALIPER MOUNTING BOLTS (2)

•

INNER SEAL (RUBBER)

•

BALL BEARINGS (3)

•

SLEEVES (2)

•

SPRING

•

RUBBER BOOT

•

THRUST WASHER

•

STAINLESS WASHER HARDENED WASHER

• •

•

•

• FRONT CALIPER TORQUE PLATE INNER CAM

•

•

SLEEVE SEAL (2)

RETAINER OUTER CAM

••

OUTER ADJUSTING NUT 720C-PB4

•

LEVER

INNER ADJUSTING NUT

BRAKE CALIPER ASSEMBLY LATER MACHINES 9.6

Tigercat 720C Feller Buncher

Brakes and Differential Locks

CALIPER FLOAT ADJUSTMENT (LATER MACHINES)

LINING REPLACEMENT (LATER MACHINES)

1. Using a feeler gauge, check that a gap (0.010” – 0.060”), referred to as caliper float, exists between the two mounting bolt sleeves and the caliper mounting bracket. There must be a 0.010” to 0.060” caliper float.

1. Loosen inner and outer locking nuts on the center adjusting bolt just enough to slide each of the caliper torque plates away from the disc and far enough to allow removal of the carrier and lining assemblies. It may be necessary to completely remove one or both nuts from the center adjusting bolt for this procedure.

If adjustment is required; Loosen the two caliper mounting locknuts (behind the mounting bracket), adjust the two caliper mounting bolts and re-torque the two locking nuts to 100 to 120 lbf-ft, while holding the bolts from turning.

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

3. Slide both torque plates away from the disc, move the carrier and lining assemblies out of the pockets and remove them from the brake assembly by sliding them sideways.

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

4. Apply a coating of "anti-seize" to the outside of the two sleeves and slide the torque plates back and forth along the sleeves to ensure that "anti-seize" gets into bores of caliper plates.

3. Rotate the caliper actuating lever to the 5:00 o’clock position (as viewed from the front of the machine looking towards the back). This lever has six possible positions. Lift the lever off of the pins on the back of the outer cam.

Hold the cam from moving and rotate the lever to the desired position and place it back on to the pins on the back of the cam.

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

6. Re-install the retraction spring into the assembly. The feet on the spring must be properly located into the holes in both lining carrier assemblies.

4. Tighten the inner adjustment nut until firm contact is made with the brake disc by the linings. Torque to 100 in-lbs (8 lbf-ft) and then back off 4 to 5 flats. Check that disc is free to rotate.

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

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

CALIPER MOUNTING NUTS

MOUNTING BRKT.

CALIPER "FLOAT"

MOUNTING SLEEVES

REAR TORQUE PLATE

FRONT TORQUE PLATE

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

PARKBRK3

BRAKE CALIPER (LATER MACHINE SHOWN)

9.7

Tigercat 720C Feller Buncher

Brakes and Differential Locks

9.8

Tigercat 720C Feller Buncher SECTION 10 - OIL COOLER AUGUST 2000

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

Tigercat 720C Feller Buncher

Oil Cooler

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

RADIATOR AND OIL COOLER ASSEMBLY

A/C CONDENSER CORE

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

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

For detailed cleaning procedures, refer to CLEANING A/C CONDENSER, OIL COOLER AND RADIATOR in SECTION 2 of the OPERATOR’S MANUAL. CIRCUIT DESCRIPTION

DEBRIS SCREEN

A large volume of oil travels through the oil cooler before returning to the hydraulic tank. The boom/ steer pump and saw pump take oil from the reservoir and send it to the boom/saw valve. This oil returns to the oil cooler from the outlet section of the boom/saw valve. Cooling of the oil occurs as air is drawn through the oil cooler core. Cooled oil then passes through the dual head return filter and into the hydraulic reservoir.

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

OIL COOLER AND RADIATOR ASSEMBLY 337-4

• • RETURN FILTER (DUAL HEAD)

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

•

SAW PUMP

• RDOOR

10.2

• PUMPS

Tigercat 720C Feller Buncher

720C-10

Oil Cooler

OIL COOLER CIRCUIT (WITH SAW ATTACHMENT) 10.3

Tigercat 720C Feller Buncher

Oil Cooler

10.4

Tigercat 720C Feller Buncher SECTION 11- STEERING AND CENTER JOINT SEPTEMBER 2000

CONTENTS - SECTION 11 CENTER JOINT ADJUSTMENT ............................................................. 11.10 CHECKING .................................................................. 11.10 DIAGRAM .................................................................... 11.11 GREASE SEALS ......................................................... 11.11 LUBRICATION ............................................................. 11.10 MAINTENANCE ........................................................... 11.10 CIRCUIT DESCRIPTION ................................................ 11.6 CIRCUIT DIAGRAM ........................................................ 11.7 JOYSTICK CONTROL VALVE ......................................... 11.5 PRESSURE SETTINGS .................................................. 11.9 SAFETY .......................................................................... 11.9 STEER RELIEF VALVE ................................................... 11.4 STEER VALVE ................................................................. 11.4 CROSS SECTION ....................................................... 11.4 DESCRIPTION ............................................................ 11.4 OPERATING DESCRIPTION ....................................... 11.4 STEER/BOOM PUMP ..................................................... 11.2

Tigercat 720C Feller Buncher STEER/BOOM PUMP

Steering and Center Joint

The steer/boom pump is a double vane pump mounted to the lower left of the pump drive gearbox. The pump drive shaft is connected to the gearbox via a splined adapter.

The shaft end section of the pump supplies hydraulic oil for the boom and clamp functions.

The cover end section of the pump supplies hydraulic oil for the steering, brake and differential lock functions and oil to the pilot circuit.

This pump requires no adjustments. Fluid flow is developed in each pump section by a cartridge which consists of a cam ring, a rotating rotor with vanes, side plates and support plates.

•

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

CAM RING WALL

VANE-1

COVER END CARTRIDGE (STEER)

AP009-3

TYPICAL VANE PUMP

SHAFT END CARTRIDGE (BOOM)

STEER/BOOM PUMP SECTION

11.2

Tigercat 720C Feller Buncher STEER RELIEF VALVE

Steering and Center Joint

The steer relief valve is located between the steer pump and the steer valve. The steer relief valve protects the steer pump and steer circuit from over pressurizing. Relief oil is directed back to tank via the secondary return filter.

The relief valve is adjusted by loosening the ADJUSTING SCREW LOCKNUT

TANK

PRESSURE RPGC

RELIEF CARTRIDGE

350-16A

STEER RELIEF VALVE

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. A gauge test port is provided at the relief valve.

11.3

Tigercat 720C Feller Buncher STEER VALVE

Steering and Center Joint

The steer valve is a control valve which consists of an open center spool section, an inlet section and an outlet section. Cartridge type relief valves are installed in both work ports of the spool section.

Shifting the spool directs oil from the steer pump to the steer cylinders.

The port relief valves in the steer valve also function as anti-cavitation relief valve. The return oil from the port relief valves is diverted back to tank via the tank passage in the spool section and the outlet section.

OPERATING DESCRIPTION Oil from the boom/steer pump (via the accumulator charge valve) enters the inlet section of the steer valve, passes through the open center spool section and back to tank via the outlet section.

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

The open center spool has three positions. A spring in the spool end cap holds the spool in the center neutral position. The spool is shifted one way or the other by pilot pressure applied to either end of the spool.

RELIEF VALVE PORT 'A'

PARALLEL PASSAGE

WORK PORT BRIDGE

A

LOAD CHECK VALVE

RELIEF VALVE PORT 'B'

B

SPOOL SPOOL CENTERING SPRING TANK PASSAGE

90136-3

THRU' NEUTRAL PASSAGE

STEERING VALVE CROSS SECTION

11.4

Tigercat 720C Feller Buncher JOYSTICK CONTROL VALVE

Steering and Center Joint OPERATING DESCRIPTION

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

Operated by hand this valve directs pilot pressure to the steer control valve pilot end caps. The spool valve then shifts from its centre position and directs pump flow to operate the corresponding cylinder.

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

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

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

When the regulating stroke begins, there is a connection from port 'P' via hole (8) in the spool and work port 2 or 4 in the base of the valve, to the steer valve pilot end caps.

Flow is directly proportional to the operator position of the joystick and the regulating spring characteristic. Moving the joystick to the right will steer the machine to the right and moving the joystick to the left will steer the machine to the left.

The steering joystick cannot move forward or back due to stops installed in these plunger ports.

RR-12

JOYSTICK PILOT VALVE

•

•

5

• •

4 3

• •

•

2

•

1

•

'P' PORT WORK PORTS 2 OR 4

AU013-2

SPOOL ARRANGEMENT

AU013-1

11.5

Tigercat 720C Feller Buncher STEER CIRCUIT DESCRIPTION

Steering and Center Joint

Two steer cylinders are used to steer the machine. Operating oil is supplied from the fixed displacement boom/steer pump, via steer relief valve and the accumulator charge valve, to the steer valve. The steer valve controls the flow of oil to and from the steering cylinders. The steering joystick supplies pilot oil to shift the spool in the steer valve.

Moving the joystick to the LEFT directs pilot oil to the "A" port pilot end cap of the steer control valve, this shifts the spool in the control valve and allows oil to flow from the steer pump (via the accumulator charge valve) to the two steer cylinders and steer the machine LEFT. Moving the joystick to the RIGHT directs pilot oil to the "B" port pilot end cap of the steer valve and steers the machine RIGHT. Return oil from the cylinders flows back to the steer valve and is directed back to tank through the outlet section of the steer valve.

The steering "speed" is controlled by the amount the joystick is moved to the right or left. A small movement of the joystick will turn the machine slowly and a large movement of the joystick will turn the machine very rapidly. Relief valves are installed on both ports of the steer valve to prevent over pressurizing of the steer cylinders when the control spool is in the center position.

The steer relief valve is the steer circuit main relief valve. It is set lower than the steer valve port reliefs and is installed in the line between the boom/steer pump and the accumulator charge valve. This protects the system by preventing system pressure from rising above the preset value. Higher system pressures will cause the steer relief valve to direct oil back to tank.

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

11.6

Tigercat 720C Feller Buncher

720C-11

Steering and Center Joint

STEER CIRCUIT DIAGRAM 11.7

Tigercat 720C Feller Buncher

Steering and Center Joint

11.8

Tigercat 720C Feller Buncher

Steering and Center Joint

STEERING PRESSURE SETTINGS

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

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

5. Start the engine and set the throttle control to IDLE.

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

IMPORTANT

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

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

• Never stand in the articulating zone of the machine during set-up. Always stand on the side opposite to the direction in which the machine is being steered.

• Be aware of machine pinch points that could cause injury. Never place body parts within the range of motion of moving parts.

A B

LEFT

RETAINING PIN

RIGHT

STEER VALVE

AT055

•• LYNCH PIN

PORT 'B' RELIEF

PORT 'A' RELIEF

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

ARTICULATION LOCK BAR

6. While attempting to steer the machine to the RIGHT, set the port 'B' relief on the steer valve to 3200 psi.

7. While attempting to steer the machine to the LEFT, set the port 'A' relief to 3200 psi.

8. Turn steer relief valve all the way out.

••

9. Move the throttle control to the FULL position.

•• 195-24

TEST PORT

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

INSTALL ARTICULATION LOCK BAR

••

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

••

WARNING 350-16A

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

STEER RELIEF

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

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

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

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

3. Turn the steer relief valve adjusting screw all the way in and then back out two turns.

11.9

Tigercat 720C Feller Buncher

Steering and Center Joint

CENTER JOINT MAINTENANCE OF CENTER JOINT Maintenance in this area is usually limited to: a) Regular lubrication of the two center joint grease fittings (items 11) to purge the pivot bearings of debris and water. Refer to SCHEDULED MAINTENANCE in SECTION 3 of THIS MANUAL for lubrication intervals.

Use only high quality, lithium based EP2 grease containing molybdenum disulphide.

4. Partially depress the plunger end of the dial indicator against the bottom surface of the front chassis upper lug 'B' as close to center pin as possible. Zero the dial indicator.

5. Fully loosen only the 6 bottom pin retainer bolts (item 2) that were torqued in step 2.

DIAL INDICATOR PLUNGER

B

•• ••

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

REAR CHASSIS

DIAL INDICATOR FRONT CHASSIS

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

DIAL INDICATOR BASE

2. As machine bounces, check for motion between the front and rear chassis frame lugs. Also check for a "clunking" sound at the center joint area.

267-17

• A

CHECK PRELOAD

6. The dial indicator should now show a change of 0.008" to 0.012" between lug 'A' and 'B'.

This is the proper bearing preload setting.

FRONT CHASSIS

CHECK FOR MOVEMENT IN THIS JOINT AREA

267-8

A change of less than 0.008" indicates that the bearing preload is too low. No change on the dial indicator is the result of a loose center joint. In these cases, proceed to CENTER JOINT PRELOAD ADJUSTMENT.

REAR CHASSIS

1000 HOUR CHECK

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

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

CENTER JOINT PRELOAD ADJUSTMENT Before making any adjustments to the center joint, please follow CHECKING THE CENTER JOINT BEARING procedure in THIS SECTION. With dial indicator still in place; 7. Remove all bottom pin retainer bolts (item 2), the bottom pin retainer plate (item 3) and all of the shims in the shim pack (items 10).

CAUTION: Keep upward pressure on the bottom pin (item 9) and do not allow pin to fall out from bearing. These pivot pins are very heavy, block the pin in place if necessary.

2. Torque the 6 top and 6 bottom retainer bolts (items 1 and 2) to 282 - 310 lbf-ft.

3. Place the magnetic base of a dial indicator on the top surface of the front chassis lower lug 'A' as close to the center pin as possible.

8. Remove the thinnest shim from the pack.

9. Reinstall the remaining shims, the retainer plate and the bolts. Leave the bolts loose.

10. Zero the dial indicator again and torque the 6 bottom bolts in sequence to 282 - 310 lbf-ft.

11.10

Tigercat 720C Feller Buncher

Steering and Center Joint

11. A change of 0.008" to 0.012" should register on the dial indicator.

ORIENTATION OF GREASE SEALS The pivot bearings (item 4) are sealed on both sides by grease seals (items 5 and 6). These seals have proven to have a long life.

This is the proper bearing preload setting. a) If change in dial indicator reading is greater than 0.012", the shim removed (in step 8) was not thin enough. Obtain a thinner shim and put it back into the shim pack (item 9).

If replacement becomes necessary, new seals must be installed in the proper orientation. Refer to the center joint diagram and follow these guidelines for correct installation;

b) If the change in the dial indicator reading is less than 0.008", another shim will have to be removed. Repeat steps 7 through 11, removing additional shims but only the thinnest shim each time, until the change in the reading on dial indicator is within the proper range. c) It is possible that the total thickness of two shims is too great and a single shim, of lesser thickness than these two, must be removed.

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

•

The two seals installed on either side of the top bearing must be installed with the seal garter spring facing UP.

•

The two seals installed on either side of the bottom bearing must be installed with the seal garter spring facing DOWN.

Apply Loctite (blue - removable) or equivalent and torque the six bolts (item 7) for the bearing retainer plate (item 8) to 80 - 88 lbf-ft.

1

•

GREASE SEALS WITH SPRINGS FACING UPWARD

REAR CHASSIS 11

• •

• FRONT CHASSIS • 6

• • •

726B09

• • •

10 3

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

4 5

• GREASE SEALS WITH SPRINGS FACING DOWN

9

• CENTER JOINT 11.11

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

Tigercat 720C Feller Buncher

Steering and Center Joint

11.12

Tigercat 720C Feller Buncher SECTION 12 - LIFT BOOM JUNE 2000

CONTENTS - SECTION 12 BOOM VALVE ASSEMBLY PROCEDURE .................................................................................................... 12.7 CROSS SECTION OF SPOOL SECTION ............................................................................. 12.3 OPERATING DESCRIPTION ................................................................................................. 12.2 RELIEF VALVES ......................................................... SEE SECTION 18 - CLAMPS WITH SAW CIRCUIT DESCRIPTION ........................................................................................................ 12.4 CIRCUIT DIAGRAM ................................................................................................................ 12.5 JOYSTICK CONTROL VALVE ................................................................................................. 12.2 OPERATING DESCRIPTION ................................................................................................. 12.2 LIFT BOOM CYLINDER LOCK ............................................................................................... 12.6 PRESSURE SETTINGS .......................................................................................................... 12.6 PUMP, DESCRIPTION BOOM/STEER PUMP ................................................................ SEE SECTION 11 - STEERING SAFETY .................................................................................................................................. 12.6

Tigercat 720C Feller Buncher BOOM JOYSTICK VALVE

Lift boom OPERATING DESCRIPTION

The boom joystick pilot valve is a manually operated directional control valve and operates on the same principle as a direct operating pressure reducing valve. Operated by hand, this valve directs pilot pressure to the boom valve pilot end caps. The corresponding spool valve then shifts from its centre position and directs pump flow to operate the corresponding cylinder.

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

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

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

When the regulating stroke begins, there is a connection from port 'P' via the hole (8) in the spool and work ports 1, 2, 3 or 4 in the base of the valve, to the boom valve pilot end caps.

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

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

Each spool section is pilot operated. An outlet section directs return oil back to tank. The control valve is located on the front chassis above the front axle and behind the cover plate.

OPERATING DESCRIPTION

JOYSTICK PILOT VALVE

RR-12

'P' PORT

AUO13-2

Oil enters the mid inlet section and is allowed to pass through the four spool sections and back to tank via the outlet section. Each of these spool sections has a self centering 3-position spool which is open centered. A spring in the spool end cap holds the spool in the center neutral position.

The spool is shifted by pilot pressure being applied to either end of the spool. Shifting the spool directs oil to operate any one of the four functions (or all at the same time if required but with reduced flow to each).

•

•

5

• •

4 3

• •

•

2

•

1

•

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

A main relief valve is installed in both the mid inlet section and the saw inlet section of the valve. The mid inlet main relief valve controls the lift spool section and is set lower than the lift up port relief valve. All relief valves are the same type (anti-cavitation relief valve). For a detailed description of these relief valves, refer to RELIEF VALVES in SECTION 18 of THIS MANUAL.

WORK PORTS 1, 2, 3 OR 4

SPOOL ARRANGEMENT

12.2

Tigercat 720C Feller Buncher

Lift boom

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

LIFT 'DOWN' PORT RELIEF

•

(2200 PSI)

LIFT 'UP' PORT RELIEF (2900 PSI)

•

•

LIFT

MID INLET GAUGE TEST PORT

•

•

MID INLET MAIN RELIEF (2600 PSI)

•

MID. INLET SECTION

• **NOTE**

SAW MAIN RELIEF

•

SHEAR AND CLAMP SPOOL SECTION FOR BUNCHING SHEAR INSTALLATIONS

BOOM CONTROL VALVE WITH SAW

AT023B

RELIEF VALVE PORT 'A'

PARALLEL PASSAGE

LOAD CHECK VALVE

A

WORK PORT BRIDGE

RELIEF VALVE PORT 'B'

B

PILOT END CAP PILOT END CAP

90136-3

SPOOL CENTERING SPRING

SPOOL TANK PASSAGE

THRU' NEUTRAL PASSAGE

CROSS SECTION OF SPOOL SECTIONS

12.3

Tigercat 720C Feller Buncher CIRCUIT DESCRIPTION

Lift boom

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

Two cylinders are used to raise and lower the felling head. The boom cylinders receive oil from a fixed displacement pump via the LIFT spool section in the boom valve. The lift spool section in the boom valve is pilot operated at both ends.

Pilot oil from the boom (right hand) joystick control valve in the operator's cab shifts the spool. The spool directs oil from the pump to either end of the cylinders and from the cylinders back to tank via the oil cooler and primary return double filter.

12.4

Tigercat 720C Feller Buncher

720C-12

Lift boom

LIFT BOOM CIRCUIT (SHOWN WITH SAW VALVE SECTION) 12.5

Tigercat 720C Feller Buncher PRESSURE SETTINGS

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

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

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

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

If less than 2900 psi, lower boom to rest against lock, stop engine and readjust LIFT UP port relief. Repeat above procedure until a gauge reading of 2900 psi is obtained.

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

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

IMPORTANT

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

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

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

8. Remove lift boom cylinder lock. It is not designed to withstand high forces created by the hydraulic system. Never use this cylinder lock to set boom down port relief.

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

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

WARNING

If less than 2200 psi, release pressure in rod end of lift cylinders and allow felling head to sit on the ground. Stop engine and readjust LIFT DOWN port relief. Repeat above procedure

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

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

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

until a gauge reading of 2200 psi is obtained.

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

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

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

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

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

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

5. Turn both lift spool section port relief valve adjusting screws OUT until spring pressure is relieved then turn adjusting screws one full turn IN.

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

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

12.6

Tigercat 720C Feller Buncher BOOM VALVE ASSEMBLY PROCEDURE

Lift boom

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

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

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

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

2. Assemble tie rod nuts to one end of each tie rod with one or two threads showing. Insert tie rods through rod holes in inlet section (larger diameter rod at top). Lay inlet section on end with tie rods up. Place the "O" ring in position within the groove.

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

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

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

12.7

Tigercat 720C Feller Buncher

Lift boom

12.8

Tigercat 720C Feller Buncher SECTION 13 - TILT JUNE 2000

CONTENTS - SECTION 13 BOOM VALVE DIAGRAM ....................................................................................... 13.2 CIRCUIT DESCRIPTION ....................................................................................... 13.2 CIRCUIT DIAGRAM ............................................................................................... 13.3 CONTROL VALVES ................................................................................................ 13.2 PRESSURE SETTINGS ......................................................................................... 13.4 SAFETY ................................................................................................................. 13.4

Tigercat 720C Feller Buncher

Tilt

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

**NOTE**

TILT

• •

•

CLAMP

SHEAR AND CLAMP SPOOL SECTION FOR BUNCHING SHEAR INSTALLATIONS

ACCUM

LIFT GAUGE TEST PORT

• MID. INLET SECTION

•

• SAW

MAIN RELIEF (2600 psi)

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

AT023A

BOOM VALVE (SHOWN WITH SAW)

CONTROL VALVES

CIRCUIT DESCRIPTION

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

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

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

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

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

13.2

Tigercat 720C Feller Buncher

720C-13

Tilt

TILT CIRCUIT (SHOWN WITH SAW VALVE SECTION) 13.3

Tigercat 720C Feller Buncher PRESSURE SETTINGS

Tilt IMPORTANT

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

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

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

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

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

IMPORTANT

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

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

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

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

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

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

WARNING

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

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

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

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

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

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

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

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

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

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

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

11. While holding the joystick in the TILT IN position, check gauge pressure reading.

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

If less than 2600 psi, lower felling head to the ground. Stop engine and readjust the mid inlet main relief. Repeat above procedure until a gauge reading of 2600 psi is obtained.

5. Turn both tilt spool section port relief valve adjusting screws OUT until spring pressure is relieved then turn adjusting screws one full turn IN.

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

13.4

Tigercat 720C Feller Buncher SECTION 17 - SAW DRIVE JUNE 2000

CONTENTS - SECTION 17 CIRCUIT DESCRIPTION ................................................................................ 17.4 CIRCUIT DIAGRAM ........................................................................................ 17.5 PRESSURE SETTINGS .................................................................................. 17.6 SAFETY .......................................................................................................... 17.6 SAW MOTOR ....................................... SEE SAW MANUFACTURER'S MANUAL SAW PUMP POR VALVE ................................................................................................. 17.7 TEST PORT ................................................................................................. 17.7 SAW VALVES PILOT OPERATED SOLENOID VALVE ....................................................... 17.2 SAW SECTION OF BOOM VALVE ............................................................... 17.3

Tigercat 720C Feller Buncher

Saw drive

SAW CONTROL VALVES The saw circuit is controlled by a solenoid operated pilot valve in the pilot manifold and a pilot operated saw valve which is part of the boom valve.

SOLENOID OPERATED PILOT VALVE For a description of the pilot valve refer to PILOT MANIFOLD SECTION 5 of THIS MANUAL. OPERATING DESCRIPTION An electrical signal from the saw switch in the cab energizes the solenoid at the pilot manifold (C8) to shift the spool and direct pilot oil to one end of the saw valve spool section.

SOLENOID TO SAW SWITCH

• TO BOOM/SAW MAIN VALVE

•

TEST PORT

• • C8

720B16

PILOT MANIFOLD (SAW)

17.2

Tigercat 720C Feller Buncher

Saw drive LOAD CHECK VALVE

PARALLEL PASSAGE

A

PLUG

WORK PORT BRIDGE

B PLUG

PILOT END CAP PILOT END CAP

SPOOL CENTERING SPRING

SPOOL TANK PASSAGE

THRU' NEUTRAL PASSAGE

90136-4

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

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

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

Each spool section is pilot operated.

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

SAW SPOOL SECTION SAW RELIEF (3900 psi)

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

•

OPERATING DESCRIPTION

TO SAW GAUGE ON SIDESTAND

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

•

•

• 306-4

SAW INLET SECTION

SAW SECTION OF BOOM CONTROL VALVE

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

OUTLET SECTION

•

The spool is shifted by pilot pressure being applied to one end of the spool from C8 port of the pilot manifold. Shifting the spool directs oil from the saw pump to the saw motor.

The saw relief valve installed in the saw end inlet section of the boom valve protects the pump in case of failure of the POR on the pump.

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

SAW END INLET SECTION TO GAUGE ON SIDESTAND

AT023S

17.3

•

• •

SAW RELIEF (3900 psi)

BOOM VALVE (SAW SECTION)

Tigercat 720C Feller Buncher SAW CIRCUIT DESCRIPTION

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

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

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

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

A solenoid operated pilot valve (C8) in the pilot manifold controls the flow of pilot oil to the end of the saw spool section in the boom valve.

With the saw switch in the ON position, the solenoid operated pilot valve is in the energized position directing pilot oil to shift the saw spool in boom 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.

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

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

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

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

IMPORTANT

When the pressure (system pressure) builds up to 3600 psi the spool in the pump POR 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 a lower horsepower requirement and reduces heat generation since the pump stops pumping rather than dumping hydraulic oil over relief valves.

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

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

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

17.4

Tigercat 720C Feller Buncher

720C-14

Saw drive

SAW CIRCUIT DIAGRAM Tigercat DW5000, DW5600 and SW5700 Bunching Saws Koehring Waterous 18" and 20" Felling Heads 17.5

Tigercat 720C Feller Buncher

Saw drive

PRESSURE SETTINGS:

1.

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

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

WARNING

• Never assume that other workers are aware of disc saw dangers.

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

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

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

2.

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

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

• Be aware that the saw blade is virtually silent as it coasts to a stop.

3.

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

• A slowly rotating blade can crush bones.

Beware pinch points when rotating blade by hand.

4.

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

5.

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

6.

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

7.

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

8.

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

9.

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

• Do not, under any circumstances, overspeed the saw blade RPM.

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

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

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

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

• Keep clamp and accumulator arms closed whenever possible during setup.

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

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

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

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

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

17.6

Tigercat 720C Feller Buncher

Saw drive

SAW PUMP SAW PUMP

SAW SPOOL SECTION SAW RELIEF (3900 psi)

•

• TO SAW GAUGE ON SIDESTAND

GAUGE TEST PORT

• •

POR ADJUSTING SCREW

•

306-4

•

12.

350-9A

10.

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

•

SAW SECTION OF BOOM CONTROL VALVE

SAW INLET SECTION

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

IMPORTANT

SAW GAUGE

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

13.

Start the engine and put throttle control to the IDLE position. Ensure the hydraulic oil temperature is between 1200F and 1400F.

14.

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

213-24

10a. Use gauge on sidestand when adjusting saw valve relief at front of machine.

15.

SAW PUMP

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

PUMP BODY

•

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

POR VALVE (3600 PSI)

16.

Set POR valve on saw pump to 3600 psi (Gauge at rear of machine).

17.

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

SET MOTOR POR HOSES REMOVED FOR CLARITY

• •

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

25-22AX

11.

Screw POR valve adjusting screw on the saw pump all the way in.

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

17.7

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

Tigercat 720C Feller Buncher

Saw drive

17.8

Tigercat 720C Feller Buncher SECTION 18 - CLAMPS WITH SAW JUNE 2000

CONTENTS - SECTION 18 BOOM VALVE .................................................................................................. 18.2 OPERATING DESCRIPTION ....................................................................... 18.3 SPOOL SECTION DIAGRAM ...................................................................... 18.3 CIRCUIT DESCRIPTION ................................................................................ 18.4 CIRCUIT DIAGRAM ........................................................................................ 18.5 CONTROL VALVES ......................................................................................... 18.2 PILOT LINE PRESSURES ............................. SEE SECTION 5 - PILOT SYSTEM PRESSURE SETTINGS .................................................................................. 18.6 RELIEF VALVES ADJUSTING PROCEDURE ......................................................................... 18.9 OPERATION ................................................................................................ 18.8 SAFETY .......................................................................................................... 18.6 SPOOL SECTION DIAGRAM ......................................................................... 18.3

Tigercat 720C Feller Buncher CONTROL VALVES

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

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

All five spools in the valve are open center type.

Each spool section is pilot operated. An outlet section directs return oil back to tank.

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

Cartridge type port relief valves are installed in both work ports of the clamp spool section and both work ports in the accumulator spool section.

The mid inlet section has a single main relief valve. These reliefs protect the circuits (pumps) from high pressures during operation.

For a complete description of the foot operated pilot valve, refer to FOOT CONTROL VALVE in SECTION 8 of THIS MANUAL. BOOM VALVE The boom valve is located on the front chassis above the front axle and behind the cover plate.

One of the five spool sections is used to open and close the clamp and a second spool section to open and close the accumulating arm.

There are two inlet sections. The end inlet is for the saw spool section and receives oil from the

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

• ACCUMULATOR 'CLOSE' PORT RELIEF (3200 PSI)

•

CLAMP

•

ACCUM

•

•

ACCUMULATOR 'OPEN' PORT RELIEF (3200 PSI)

•

•

MAIN RELIEF (2600 PSI)

MID. INLET SECTION

GAUGE TEST PORT (IN ELBOW)

•

•

SAW RELIEF

END INLET SECTION

BOOM AND SAW MAIN CONTROL VALVE AT023ACC

Tigercat DW5000, DW5600 and SW5700 Bunching Saws Koehring Waterous 20" Disc Saws 18.2

Tigercat 720C Feller Buncher

Clamps with Saw

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

Oil from the fixed displacement boom/steer pump enters the mid inlet section of the boom valve and is allowed to pass through the four open center spool sections and back to tank via the outlet section.

PARALLEL PASSAGE

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

The relief valves installed in the inlet and spool sections of the boom valve protect the pump in case of failure of the POR valve on the pump.

All of the relief valves on the boom valve divert oil to tank via the tank passages in the spool sections and the outlet section of the boom valve.

They also function as anti-cavitation relief valves.

The open centered spools in all of the sections have three positions and are self centering. A spring in the spool end cap holds the spool in the center neutral position.

RELIEF VALVE PORT 'A'

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

LOAD CHECK VALVE

A

WORK PORT BRIDGE

RELIEF VALVE PORT 'B'

B

PILOT END CAP PILOT END CAP

90136-3

SPOOL CENTERING SPRING

SPOOL TANK PASSAGE

THRU' NEUTRAL PASSAGE

CROSS SECTION OF CLAMP SPOOL SECTION

18.3

Tigercat 720C Feller Buncher CLAMPS WITH SAW

Clamps with Saw

Tigercat DW5000, DW5600 and SW5700 Bunching Saw Heads.

Koehring Waterous 20" Saw Heads.

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

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

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

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

The accumulating arm is operated by a 3 position thumb switch OPEN/CLOSE (self centering to OFF) located on the right joystick control. The switch operates two solenoid pilot valves on the pilot manifold which direct pilot oil to the accumulator spool section of the boom control valve, to shift the spool. The spool directs oil from the pump to either end of the accumulating arm cylinder to open or close the arm. Return oil is directed back to tank via the oil cooler and dual head return oil filter.

18.4

Tigercat 720C Feller Buncher

Clamps with Saw

ACCUMULATING AND CLAMP ARMS CIRCUIT Tigercat DW5000, DW5600, and SW5700 Bunching Saws Koehring Waterous 20" Disc Saws 720C-15

18.5

Tigercat 720C Feller Buncher PRESSURE SETTINGS

Clamps with Saw WARNING

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

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

Before starting this procedure, read the following safety precautions:~ • Never reach between boom crank arms or link arms during machine setup.

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

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

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

• Keep clamp and accumulator arms closed whenever possible during setup.

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

• Clamp and accumulator arms open and close very rapidly, always keep clear of operating area.

IMPORTANT

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

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

NOTE: This procedure assumes that a Tigercat Bunching Saw Head is used.

Follow same procedure for Koehring Waterous 20" Saw Head. Refer to illustration of LIFT BOOM CONTROL VALVE on page 2 for orientation and pressure value references .

5. Turn the port relief valve adjusting screws on both the accumulator and clamp spool sections of the control valve OUT until spring pressure is relieved then turn adjusting screws one full turn IN. 6. Start the engine, and put the throttle control to the IDLE position.

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

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

IMPORTANT

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

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

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

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

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

WARNING

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

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

18.6

Tigercat 720C Feller Buncher

Clamps with Saw

1100 psi is obtained.

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

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

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

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

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

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

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

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

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

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

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

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

SET PILOT LINE PRESSURES: NOTE: MANUAL.

Refer to SECTION 5 of THIS

18.7

Tigercat 720C Feller Buncher

Clamps with Saw ANTI-CAVITATION RELIEF VALVE

VALVE POPPET

This valve is used as a MAIN and PORT relief valve in the saw, clamp arm, and accumulating arm control valves.

T P

Operation Step 1.

T

STEP 1 PILOT POPPET

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

T

Step 2.

P

STEP 2

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

T SEATING POPPET

Step 3.

T

As a result of the opening of the pilot poppet, the seating poppet moves back, due to the pressure drop caused by oil flow through the bore of the seating poppet, and seats against the pilot poppet. This shuts off the flow of oil through the seating poppet and the cavity pressure now drops to tank pressure.

P

STEP 3

T

Step 4.

VALVE POPPET

T

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

P

STEP 4

T

Step 5.

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

T

VALVE POPPET

P

STEP 5

T CHECK POPPET

As an anti-void or check valve.

The anti-void unit supplies oil to the pressure area ‘P’ when its pressure drops below the pressure in the tank gallery of the valve. The valve then acts as a free flow check valve and prevents cavitation.

In this condition, the pressure at ‘P’ is lower than at ‘T’ and due to the shape of the check poppet, the pressure forces cause the poppet to unseat, allowing oil to flow from ‘T’ to ‘P’.

T P

ANTI-VOID CHECK OPERATION

T 18.8

Tigercat 720C Feller Buncher

Clamps with Saw

ANTI-CAVITATION RELIEF VALVE ADJUSTING PROCEDURE ADJUSTING NUT

•

JAMNUT

•

51055-2

RELIEF VALVE

1.

Loosen jamnut.

2.

Turn adjusting nut to obtain desired pressure reading on gauge.

3.

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

5.

Re-check relief setting.

For complete step-by-step pressure setting procedures of circuits using these relief valves, refer to appropriate sections in THIS MANUAL.

18.9

Tigercat 720C Feller Buncher

Clamps with Saw

18.10

Tigercat 720C Feller Buncher SECTION 19 - CLAMPS WITH SHEAR JUNE 2000

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

Tigercat 720C Feller Buncher CLAMPS WITH SHEAR

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

Tigercat 1800 and 2000 Model Bunching Shears CONTROL VALVES

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

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

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

All five spools in the valve are open center type.

Each spool section is pilot operated.

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

An outlet section directs return oil back to tank.

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

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

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

OUTLET SECTION

• SHEAR 'OPEN' PORT RELIEF (3200 psi)

PLUG (NO PORT RELIEF) SHEAR AND CLAMP

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

•

ACCUM.

• •

GAUGE TEST PORT FOR ACCUM. ARM AND SHEAR OPEN

MAIN RELIEF (2600 psi)

•

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

3713AIL2

ACCUMULATOR ARM 'OPEN' PORT RELIEF (3200 psi)

•

• SHEAR AND CLAMP

•

•

•

CLAMP 'OPEN' PORT RELIEF (3700 psi)

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

BOOM VALVE SHOWN WITH SHEAR

19.2

Tigercat 720C Feller Buncher RELIEF VALVE PORT 'A'

Clamps with shear PARALLEL PASSAGE

LOAD CHECK VALVE

A

WORK PORT BRIDGE

RELIEF VALVE PORT 'B'

B

PILOT END CAP PILOT END CAP 90136-3

SPOOL CENTERING SPRING

SPOOL TANK PASSAGE

THRU' NEUTRAL PASSAGE

CROSS SECTION OF SHEAR/CLAMP SPOOL SECTION (END)

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

Oil from the fixed displacement boom/steer pump enters the mid inlet section of the boom valve and is allowed to pass through the four open center spool sections and back to tank via the outlet section.

The open centered spools in all of the sections have three positions and are self centering. A spring in the spool end cap holds the spool in the center neutral position.

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

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

The relief valves installed in the first shear/clamp spool section of the boom valve are to protect the pump in case of failure of the POR valve on the pump.

All of the relief valves on the boom valve divert oil to tank via the tank passages in the spool sections and the outlet section of the boom valve.

They also function as anti-cavitation relief valves.

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

19.3

Tigercat 720C Feller Buncher

720C-16

Clamps with shear

CLAMPS WITH SHEAR CIRCUIT 19.4

Tigercat 720C Feller Buncher

Clamps with shear

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

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

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

The accumulating arm is operated by a 3 position thumb switch OPEN/CLOSE (self centering to OFF) located on the right joystick control. The switch operates two solenoid pilot valves which direct pilot oil to the ACCUMULATING spool section of the boom valve to shift the spool. The spool directs oil from the fixed displacement boom pump to either end of the accumulating arm cylinder to open or close the arm. Return oil is directed back to tank via the oil cooler and primary return dual head filter.

19.5

Tigercat 720C Feller Buncher PRESSURE SETTINGS

Clamps with shear 1. Completely raise lift boom and place locking device over one of the two cylinder rods. For complete installation procedure, refer to LIFT BOOM CYLINDER LOCK in SECTION 12 of THIS MANUAL.

Before starting this procedure, read the following safety precautions:~ • Do not assume that other workers are aware of the dangers associated with shears.

• Because of background noise, a closing (or opening) shear is virtually silent.

WARNING

• Shear blades and clamp arms open and close very rapidly, always keep clear of operating area.

Do not stand above or below the felling head and lift boom or between the boom and front chassis during this procedure.

• Keep clamp and accumulator arms closed whenever possible during setup.

TO SET SHEAR OPEN AND ACCUMULATOR OPEN AND CLOSE RELIEF VALVES:-

• Never reach between boom crank arms or link arms during machine setup.

Refer to RELIEF VALVE ADJUSTING PROCEDURE in SECTION 18 of THIS MANUAL.

• Do not stand on top or inside of boom arms.

2. Connect a 0 - 5000 psi pressure gauge (with at least 4' of hose) to the test port on the elbow at the mid inlet section of the boom and shear control valve.

• When a shear is attached to a machine, the blade mounting bolts must be retorqued.

• Wear safety glasses and safety shoes when working on shears.

3. Turn the boom mid inlet main relief adjusting screw all the way IN.

• Park machine on level ground, lower shear head to the ground, and set parking brake ON. Install articulation lock bar, block wheels and stop engine.

4. Turn the port relief valve adjusting screws on both the accumulating and clamp spool sections of the control valve OUT until spring pressure is relieved then turn adjusting screws one full turn IN.

• Check for foreign objects (wood, stones, nuts, bolts, etc.) resting on or around the blades. Make sure all tools and spare parts are removed from the shear area. If shear closes on any object, injury may occur from propelled objects or pieces.

5. Start the engine, and set throttle to IDLE.

IMPORTANT

• Check torque on blade mounting bolts.

Never run engine at full throttle with main relief turned all the way in.

• Warn everyone to stay away from the shear head and the immediate area.

• Slowly close the shear blade and check for proper clearances, alignment and operation.

WARNING

SHEAR AND CLAMP

To prevent injury caused by accidental steering of the machine when setting pressures, make sure the articulation lock bar is held securely in place by the lynch pins provided.

ACCUM

TEST PORTS ON ELBOWS

• SHEAR AND CLAMP

WARNING •

Before performing work under the felling head or lift boom, install the lift boom cylinder lock.

3717AIL2

19.6

BOOM AND SHEAR MAIN VALVE

Tigercat 720C Feller Buncher

Clamps with shear TO SET SHEAR/CLAMP CLOSE AND CLAMP OPEN RELIEF VALVES:-

IMPORTANT During the following procedures, DO NOT hold ANY function control for LONGER THAN 5 SECONDS.

13. Connect a 0 - 5000 psi . pressure gauge (with at least 4' of hose) to test port on the end inlet section of the boom and shear control valve.

6. While holding the foot pedal in the CLAMP/ SHEAR OPEN position (shear cylinder fully retracted), check gauge pressure reading.

SHEAR PUMP SHEAR PUMP

If less than 3200 psi, stop engine and readjust SHEAR OPEN port relief. Repeat above procedure until a gauge reading of 3200 psi is obtained.

•

IMPORTANT

GAUGE TEST PORT

Avoid blowing oil over relief longer than 5 seconds, as excessive heating of hydraulic fluid and damage to boom pump can occur.

POR ADJUSTING SCREW

7. While holding the right joystick thumb switch in the ACCUMULATING ARM OPEN position (accumulating cylinder fully retracted), check gauge pressure reading.

If less than 3200 psi, stop engine and readjust ACCUMULATING ARM OPEN port relief.

Repeat above procedure until a gauge reading of 3200 psi is obtained.

• •

350-9A

14. Connect a 0-5000 psi pressure gauge in test port on SHEAR PUMP for use when working at rear of machine.

SHEAR PUMP

If less than 3200 psi, stop engine and readjust ACCUMULATING ARM CLOSE port relief.

Repeat above procedure until a gauge reading of 3200 psi is obtained.

9. Stop engine, unscrew mid inlet main relief adjusting screw 3 full turns.

PUMP BODY

•

8. While holding the right joystick thumb switch in the ACCUMULATING ARM CLOSE position (accumulating cylinder fully extended), check gauge pressure reading.

POR VALVE (3600 PSI)

HOSES REMOVED FOR CLARITY

• •

STAND-BY VALVE (SCREWED FULLY IN) 11/16" WRENCH 3MM ALLEN WRENCH

25-22AX

10. Start engine and move the throttle control to the FULL position.

15. At the SHEAR PUMP, screw the POR valve adjusting screw all the way IN.

IMPORTANT

NOTE: Stand-by valve on pump is not used for this application, therefore adjusting screw should remain screwed fully in.

Never run engine at full throttle with main relief turned all the way in.

11. While holding the joystick thumb switch in the ACCUMULATING ARM OPEN position, check gauge pressure reading.

If less than 2600 psi, stop engine and readjust mid inlet main relief. Repeat above procedure until a gauge reading of 2600 psi is obtained.

12. Remove pressure gauge and wipe up any excess oil from test port area.

16. At the valve, unscrew both port relief valve adjusting screws on the SHEAR spool section until spring pressure is relieved.

17. Start the engine, and put the throttle control to the IDLE position.

Continued on page 8

19.7

Tigercat 720C Feller Buncher

Clamps with shear

IMPORTANT Before starting engine, ensure both port relief valves are unscrewed as stated in paragraph 16, or damage could occur to the piston pump.

18. While holding the foot pedal in the SHEAR/ CLAMP CLOSED position (shear and clamp cylinders fully extended) check gauge pressure reading.

If less than 3700 psi, stop engine and readjust CLAMP/SHEAR CLOSE port relief.

Repeat above procedure until a gauge reading of 3700 psi is obtained.

NOTE: Engine RPM may have to be increased a small amount to prevent stalling.

19. While holding the foot pedal in the SHEAR/ CLAMP OPEN position (clamp cylinder fully retracted), check gauge pressure reading.

If less than 3700 psi, stop engine and readjust CLAMP OPEN port relief. Repeat above procedure until a gauge reading of 3700 psi is obtained.

20. While holding the foot pedal in the SHEAR/ CLAMP OPEN position (clamp cylinder fully retracted), set POR valve on pump to 3500 psi on gauge at rear of machine.

21. Remove pressure gauges and wipe up any excess oil from test port area.

SET PILOT LINE PRESSURES NOTE: Refer to PILOT PRESSURE SETTINGS in SECTION 5 of THIS MANUAL.

19.8