Tigercat T750 STREET TRENCHER SERVICE MANUAL - PDF DOWNLOAD

SERVICE MANUAL Tigercat T750 STREET TRENCHER TABLE OF CONTENTS

PRELIMINARY, ISSUE 1.1 , MARCH 2004

SECTION SAFETY INFORMATION AND LABELS .................................................................... 1 ELECTRICAL SCHEMATIC ....................................................................................... 2 HYDRAULIC SCHEMATIC ........................................................................................ 3 CUTTER ..................................................................................................................... 4 CUTTER PUMP ......................................................................................................... 5 CUTTER GEARBOX .................................................................................................. 6 TRAVEL ..................................................................................................................... 7 TRAVEL PUMP .......................................................................................................... 8 TRAVEL MOTOR ....................................................................................................... 9 TRANSFER CASE ................................................................................................... 10 AXLE ........................................................................................................................ 11 BRAKES ................................................................................................................... 12 PILOT SYSTEM ....................................................................................................... 13 FAN .......................................................................................................................... 14 FAN PUMP ............................................................................................................... 15 FAN MOTOR ............................................................................................................ 16 STEERING ............................................................................................................... 17 CENTER JOINT ....................................................................................................... 18 BOOM VALVE .......................................................................................................... 19 CAT C-12 (3196) ENGINE ....................................................................................... 20 PUMP DRIVE GEARBOX ........................................................................................ 21 AIR CLEANER ......................................................................................................... 22 COMPRESSED AIR ................................................................................................. 23 SERVICE NEWSLETTERS ..................................................................................... 24 MISCELLANEOUS ................................................................................................... 25 MAINTENANCE ....................................................................................................... 26

T750SM00

Tigercat

T750 Available Literature Operator's Manual ............................... Part No. 13053A Service Manual (this manual) .............. Part No. 13054A Parts Catalog ....................................... Part No. 13052A Hydraulic Adapters Book ..................... Part No. 1472A Hose Assemblies Book ....................... Part No. 3707A

Tel: (519) 442-1000

®

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

Tigercat T750 Trencher

Introduction

ii

Tigercat T750 Trencher

Introduction

Tigercat T750 Trencher

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 T750 Trencher.

The operator's manual will assist the operator with the techniques of proper and safe operation of the T750 Trencher. There is also important information regarding the safe operation of the cutting head. The service manual contains safety and servicing procedures and a preventive maintenance schedule to ensure optimum machine performance.

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

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

The phrase “and up” appearing in this manual after the serial number implies that the related information is current for any machine serial number HIGHER than the serial number preceding the “and up”.

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

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

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

Tigercat Industries Inc.

iii

Tigercat T750 Trencher

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.

NOTICE OF CERTIFICATION

Tigercat Industries Inc.

THIS STRUCTURE MEETS THESE REQUIREMENTS OR RECOMMENDED PRACTICES MANUFACTURED BY

Tigercat Industries Inc. Paris, Ont., Canada

ROPS SAE J1040

MAY94

FOPS SAE J231

JAN81

OPS SAE J1084

APR80

Tigercat Model ALL 700 SERIES MAXIMUM GROSS WEIGHT MANUFACTURERS CERTIFICATION NO.

iv

42,000 lbs.

901136

8846A R5

Tigercat T750 Trencher

Introduction

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

IT IS Tigercat POLICY THAT NO CHANGES ARE TO BE MADE TO ITS PRODUCTS INCLUDING DELETIONS OR ADDITIONS OTHER THAN A Tigercat APPROVED OPTION FITTED IN THE FACTORY APPROVED MANNER. Official approval to make changes or install options is only to be undertaken as follows: i)

The relevant options for that product must be shown or listed on current Tigercat documentation or literature such as a printed specification sheet, price list, parts manual, or product literature issued by Tigercat.

ii)

Approved options or product changes authorized in writing by the Tigercat Engineering Manager.

Authorization by any other person is unacceptable.

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

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

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

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

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

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

Tigercat Industries Inc.

v

Tigercat T750 Trencher

Introduction

vi

Tigercat T750 Trencher

SECTION 1 - SAFETY MARCH 2000

CONTENTS - SECTION 1 ARTICULATION LOCK BAR .................................................................................. 1.9 BOOM LIFT LOCK ................................................................................................. 1.9 FIRE PREVENTION ............................................................................................... 1.11 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 T750 Trencher

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 T750 Trencher

Safety

GENERAL SAFETY PRECAUTIONS

STAY CLEAR

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 well clear of the machine until the operator recognizes your presence. Make sure that the cutter has been shut down before advancing to the machine.

DANGER ROTATING CUTTER

Follow all instructions from safety inspector and supervisors.

The safety of persons outside the cab is the responsibility of the machine operator

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

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

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

Do not let an untrained person operate the machine.

Use 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

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.

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.

Tigercat T750 Trencher

Safety 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.

GENERAL SAFETY PRECAUTIONS continued

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

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.

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

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

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

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

Inspect the machine daily for signs of damage, unusual wear, fluid leaks, or faulty operation.

Repair or replace malfunctioning parts and systems immediately.

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

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

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

1.4

Tigercat T750 Trencher

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 cab roof cover are installed and properly secured.

Do not open the cab roof cover or the cab doors to increase ventilation when operating the machine.

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

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.

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

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

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

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

Sound the machine horn before starting the machine.

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.

The operator’s seat is equipped with a lap belt.

Use this restraint system at all times when operating the machine.

Start the engine according to the instructions in this manual.

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

Secure loose items in the cab.

1.5

•

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

•

Serious injury or death could result from crushing.

Tigercat T750 Trencher

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

OPERATING SAFETY PRECAUTIONS continued

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.

When parking the machine:

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

•

Park on level ground only and engage the parking brake.

•

Do not park on a hillside or incline.

•

Lower cutting attachment onto level ground.

•

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

Use only prearranged and approved signalling practices.

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

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

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

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

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

NEVER travel across a STEEP slope or side hill: •

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

•

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

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.

CAUTION

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

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

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

1.6

Tigercat T750 Trencher

Safety

OPERATING SAFETY PRECAUTIONS continued 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).

SWITCH

••

•

ACTUATOR

197-5

INTERLOCK SWITCH (L.H. DOOR SHOWN) NOTE: The engine can be started but the machine functions cannot be operated with a door open.

CAUTION

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

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 T750 Trencher

Safety

SERVICING SAFETY PRECAUTIONS

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

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

Never use bare hand to check for fluid leaks.

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

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

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

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.

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 cutting 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.

1.8

Tigercat T750 Trencher

Safety WARNING

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

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

Always install 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 when machine is on a slope. The doors are heavy and could swing out with considerable force.

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.

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

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.

ENGINE ACCESS PANEL

•

195-24

FRAME ARTICULATION LOCK BAR

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

7501-9A

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

CAUTION The SIDE REAR engine compartment access panels are NOT HINGED or permanently attached to the machine, but are held in place by the LOWER LATCH. Therefore they can fall during the process of removing them from the machine. Once the LATCH is opened the SIDE REAR 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. Use two hands to carefully remove the panel.

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

1.9

Tigercat T750 Trencher

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 cutting head manufacturer.

1.10

Tigercat T750 Trencher

Safety • Use only nonflammable solutions for cleaning the machine or components.

FIRE PREVENTION

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

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

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

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

Fire prevention features provided by the manufacturer should be maintained in 100 percent operational condition and should be used to supplement the operator’s fire prevention efforts.

In no case should the features be used, or assumed, as replacements for diligent operator efforts at preventing fires.

To reduce the chance of a fire starting, follow these instructions: • 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.

• Clean dust and debris from the machine regularly.

• Remove debris and blow out dust from the air intake doors, engine radiator and charge air cooler, hydraulic oil cooler and A/C condenser core.

Perform this cleaning regularly to maintain efficient cooling and proper working temperatures for these critical machine components.

• Machine should be inspected at least daily for potential fire hazards at electrical, exhaust and brake systems. Repairs should be made immediately.

• Inspect electrical wiring and connections, fuel and hydraulic hose runs to ensure they are secure and not rubbing against other components.

• Clean up any excess grease and oil accumulation and spillage immediately.

1.11

Tigercat T750 Trencher

Safety

1.12

Tigercat T750 Trencher

750-02

SCHEMATIC DIAGRAM 9559B (REV 4 SHEET 1 OF 7) (MACHINE SERIAL NUMBERS 750T0111 AND UP) 1

Tigercat T750 Trencher

750-03

SCHEMATIC DIAGRAM 9559B (REV 4 SHEET 2 OF 7) (MACHINE SERIAL NUMBERS 750T0111 AND UP) 2

Tigercat T750 Trencher

750-04

SCHEMATIC DIAGRAM 9559B (REV 4 SHEET 3 OF 7) (MACHINE SERIAL NUMBERS 750T0111 AND UP) 3

Tigercat T750 Trencher

750-05

SCHEMATIC DIAGRAM 9559B (REV 4 SHEET 4 OF 7) (MACHINE SERIAL NUMBERS 750T0111 AND UP) 4

Tigercat T750 Trencher

750-06

SCHEMATIC DIAGRAM 9559B (REV 4 SHEET 5 OF 7) (MACHINE SERIAL NUMBERS 750T0111 AND UP) 5

Tigercat T750 Trencher

750-07

SCHEMATIC DIAGRAM 9559B (REV 4 SHEET 6 OF 7) (MACHINE SERIAL NUMBERS 750T0111 AND UP) 6

Tigercat T750 Trencher

750-08

SCHEMATIC DIAGRAM 9559B (REV 4 SHEET 7 OF 7) (MACHINE SERIAL NUMBERS 750T0111 AND UP) 7

Tigercat T750 Trencher

750-09

SCHEMATIC DIAGRAM 9559B (REV 1 SHEET 1 OF 6) (MACHINE SERIAL NUMBERS 750T0101 TO 750T0110) 8

Tigercat T750 Trencher

750-10

SCHEMATIC DIAGRAM 9559B (REV 1 SHEET 2 OF 6) (MACHINE SERIAL NUMBERS 750T0101 TO 750T0110) 9

Tigercat T750 Trencher

750-11

SCHEMATIC DIAGRAM 9559B (REV 1 SHEET 3 OF 6) (MACHINE SERIAL NUMBERS 750T0101 TO 750T0110) 10

Tigercat T750 Trencher

750-12

SCHEMATIC DIAGRAM 9559B (REV 1 SHEET 4 OF 6) (MACHINE SERIAL NUMBERS 750T0101 TO 750T0110) 11

Tigercat T750 Trencher

750-13

SCHEMATIC DIAGRAM 9559B (REV 1 SHEET 5 OF 6) (MACHINE SERIAL NUMBERS 750T0101 TO 750T0110) 12

Tigercat T750 Trencher

750-14

SCHEMATIC DIAGRAM 9559B (REV 1 SHEET 6 OF 6) (MACHINE SERIAL NUMBERS 750T0101 TO 750T0110) 13

Tigercat T750 Trencher

LOW PRESSURE RETURN

SWASHPLATE, AXIAL PISTON DRIVE PUMP

BENT AXIS PISTON DRIVE MOTOR

TO VEHICLE DRIVE

FROM DIESEL ENGINE

HIGH PRESSURE SUPPLY

724D-44

TYPICAL CONTINUOUS CLOSED LOOP HYDRAULIC CIRCUIT 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 hydrostatic drive system are a hydraulic pump and a hydraulic motor connected together by two hydrostatic hoses. The pump converts the mechanical power of the diesel engine into hydraulic power. This high pressure flow of hydraulic oil is then transmitted to the hydraulic motor through a connecting hose. The motor then reconverts the hydraulic power back into the mechanical power used to propel the machine. Low pressure hydraulic oil flow then returns from the motor to the pump through the other connecting hose thereby completing a continuous closed loop hydraulic circuit.

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

14

Tigercat T750 Trencher FRONT DRIVE SHAFT

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

Assembly and installation of a front drive shaft assembly.

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

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

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

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

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

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

2. Install mid drive shaft and tighten all universal joints. For torque values, refer to TORQUE CHART in SECTION 3 of THE OPERATOR'S MANUAL.

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.

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

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

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

3. Remove the set screw supplied with the bearing and discard.

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

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.

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

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

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

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.

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

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

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

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

NOTE: DO NOT use a power greaser.

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

4. Use anti-seize on the shaft splines and install the yoke onto the drive shaft. Install retaining 15

Tigercat T750 Trencher FRONT AXLE

UNIVERSALS PILLOW BLOCK BEARING

YOKE RETAINING NUT

FRONT DRIVE SHAFT

SLIP SPLINE SPLINES

YOKE

TRANSMISSION REAR OUTPUT YOKE

FLAT WING OF YOKE SLIP SPLINE SEAL

GREASE FITTING

MIDDLE DRIVE SHAFT

SLIP SPLINE TRANSMISSION FRONT OUTPUT YOKE REAR AXLE

REAR DRIVE SHAFT

SLIP SPLINE SEAL

750-15

DRIVE SHAFT INSTALLATION 16

GREASE FITTING

Tigercat T750 Trencher MID DRIVE SHAFT 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 17

Tigercat T750 Trencher AXLES Power from the drive motor is transmitted to the front and rear axles via the transmission and the front and rear drive shafts.

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

DRAIN (TOP)

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

DIFF. LOCK (BTM.)

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

FRONT AXLE

26KSM

PIVOT LUBRICATION POINT

DIFF. LOCK (BTM.)

BRAKE

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

DRAIN (TOP)

The lubricant in both axle assemblies is hydraulic oil. There are drain lines from each axle plumbed to the machine's hydraulic system. These drain lines take care of internal leakage originating from the differential locks (if applicable), which use the same hydraulic oil as the machine's hydraulic system. Refer also to AXLE LUBRICATION in THIS SECTION.

1

PIVOT LUBRICATION POINT

REAR AXLE 27KSM

AXLE HYDRAULIC CONNECTIONS

2 4

6

7

3

5 AXL-4X

LATER DESIGN - AXLE ASSEMBLY CROSS SECTION (REAR SHOWN) 18

Tigercat T750 Trencher BRAKE LINING INSPECTION (REAR AXLE ONLY)

DIFFERENTIAL AND DIFFERENTIAL LOCKS Differential and differential locks are not used in this application.

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.

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.

• • •

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

When the brake foot control pedal in the cab is depressed, brake pressure oil moves the piston up against the brake disc and traps it between the piston and the backing plate to apply the brakes.

Maximum operating pressure for the brakes is 1000 psi. For information on the hydraulic circuit, refer to SECTION 12 of THIS MANUAL.

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 DISC BACKING PLATE

ANNULAR PISTON

AXL-BRK

ANNULAR BRAKE 1

2 4

6

7

3

5 AXL-3

EARLIER DESIGN - AXLE ASSEMBLY CROSS SECTION (REAR SHOWN) 19

Tigercat T750 Trencher AXLE LUBRICATION The axles are allowed to completely fill with oil to the top of the differential case. This hydraulic oil buildup inside the differential case is due to normal internal leakage from the differential locks and is used as lubricant for the differential. The excess oil drains back to the hydraulic tank via the axle drain line.

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.

SINGLE BRAKE LINE ACTUATES BOTH BRAKES IN REAR AXLE

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

BLEED SCREWS

SINGLE BRAKE PEDAL

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

REAR AXLE ASSEMBLY

AXL-BRK1

DUAL BRAKES (REAR AXLE)

IMPORTANT

PROCEDURE

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

1. Place parking brake ON. 2. Place a clear plastic tube over bleed screw with other end in a container.

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

3. Start engine and set throttle at IDLE. 4. Loosen bleed screw.

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

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

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

7. Release brake foot pedal.

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

8. Repeat above steps for the other bleed screw.

••

724D-D30

20

•

FRONT AXLE

Tigercat T750 Trencher WHEEL INSTALLATION NOTE: All wheel installation joints and surfaces should be clean, flat surfaces (free of paint, grease and oil etc.) using grade 8 bolts, hardened washers and standard torque practices.

•

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

• CASE DRAIN PLUG

2.17" VENT PLUG

MIN. FULL THREAD

.79" .406" DRILL

.06" X 45° 7/8" - 14 UNF THREAD

20°

2.64" 3.41"

TAPERED ASSEMBLY STUD FOR 7/8" BOLTS AXL-WHL

635-P06

The tapered assembly stud shown can be fabricated to aid in wheel installation on an axle flange.

REAR AXLE (LEFT SIDE OF MACHINE) •

Rear Axle: Remove the two plugs* located on the front feft side of the rear axle. To access these plugs remove the hose guard bolted to the axle with three bolts. Tilt the left side of the axle down to facilitate better access. Use the case drain plug to fill the axle and the vent plug* to vent air

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

When cleaning axle wheel flange, be sure to use the proper thread size tap, 7/8" - 14 UNF thread.

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

*NOTE: If ONLY the axles were drained and not the entire hydraulic system, the port from which the drain line was removed will provide the vent and oil will exit from this port when the axle is full of oil. The drain line should remain capped until it is reinstalled.

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

• Remove assembly studs and install the remaining bolts.

• Torque wheel bolts to the following values:

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

7/8"-14 UNF torque to 500-550 lbf/ft. lubricated.

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

WARNING If a power wrench is used, be sure that the wheel bolts are first hand-engaged to prevent stripping. Operate the wrench slowly to prevent damage to the threads.

21

Tigercat T750 Trencher REAR AXLE OSCILLATION SHIM CHECK AND ADJUSTMENT

3.

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

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

DISCONNECT REAR PIVOT GREASE HOSE

AXLE-05

SET DIAL INDICATOR

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

••

AXLE-13

••

AXLE-06

USE LONG PRY BAR

AXLE-07

BETWEEN CHASSIS AND AXLE HOUSING

DISCONNECT FRONT PIVOT GREASE HOSE

724D-D31

22

Tigercat T750 Trencher 10. Remove the outer cover plate. Carefully remove the centre pivot cover plate from the axle (6 bolts). Care must be taken to ensure that the thrust washer (a round perforated disk) and shims do not fall.

AXLE-10

TIP AXLE SIDE TO SIDE

AXLE-12

REMOVE CENTER PIVOT COVER

SHIMS

•• AXLE-11

TIP AXLE SIDE TO SIDE

THRUST WASHER

••

5. Zero the dial indicator.

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

AXLE-16

THRUST WASHER AND SHIMS

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

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

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

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

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

13. Replace the thrust washer.

14. Replace the center pivot front cover plate.

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

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

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

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

23

Tigercat T750 Trencher BRAKE COMPONENTS

BRAKE ACCUMULATOR

For information on bleeding lines, inspecting brake linings and integral parts of the disc brakes, refer to SECTION 11 of THIS MANUAL.

The accumulator is installed to ensure that the brake control remains responsive at all times by maintaining a constant pressure of 750 psi to the brake foot control valve. The brake accumulator holds sufficient pressure for up to five (5) brake applications after the engine stalls or is shut down. Beyond this, the pressure drops substantially.

To release hydraulic pressure in the brake system, refer to RELEASE PILOT SYSTEM PRESSURE in SECTION 13 of THIS MANUAL. BRAKE PEDAL

For further information about the brake accumulator refer to BRAKE ACCUMULATOR in SECTION 13 of THIS MANUAL.

•

CIRCUIT DESCRIPTIONS BRAKE CIRCUIT 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.

7501-5A 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 13 of THIS MANUAL.

A positive stop in the brake valve limits the brake pressure to a preset value. This preset value is determined by the 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.

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

T A P

MO-02 MO-01

CROSS SECTION OF VALVE BODY

BRAKE FOOT CONTROL VALVE

24

Tigercat T750 Trencher

750-16

BRAKE CIRCUIT 25

Tigercat T750 Trencher PARKING BRAKE

brake set-up caliper.

The parking brake lever is located beside the operator’s seat. It is connected by a cable to a main disc brake caliper assembly mounted on the output side of the transmission.

Pulling up on the parking brake lever engages the

BRAKE CABLE

••

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

•• PROXIMITY SENSOR

PARKING BRAKE LEVER 336-3AX

•

••

AUXILIARY BRAKE SET-UP CALIPER METAL BAR

A second AUXILIARY SET-UP CALIPER is used for hydraulic set-up procedures only and is not cable operated. When the auxiliary set-up caliper is not being used the adjusting nut should be loose with the jam nut tightened against it.

Friction between the brake caliper and the rotating disc can cause a fire. Refer to individual pressure setting procedures throughout this manual for further information on the use of the auxiliary

•

PARKING BRAKE PROXIMITY SENSOR

337-21

brake caliper on the brake disc. A proximity sensor mounted on the side of the parking brake lever is also activated by a metal bar which moves to within 1/8" - 3/16" of the sensor. The proximity sensor activates the drive prevent circuit, to prevent the machine from being driven when the parking brake is ON. Pushing down on the lever releases the brake and de-activates the proximity sensor.

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

26

Tigercat T750 Trencher the caliper end of the brake cable.

hours under normal operating conditions.

CHECKING FOR PROPER PARKING BRAKE CABLE ADJUSTMENT

Proximity sensor: A proximity sensor attached to the parking brake has two main functions; When the brake is ON It (1) deactivates the drive prevent circuit to prevent the machine from being driven when the brake is ON and (2) enables the START circuit so that the engine can only be started with the parking brake ON. To drive the machine the parking brake must be OFF, both cab doors closed and the pilot reset button PRESSED.

The parking brake is properly adjusted when Resistance is encountered half way through the brake lever’s travel.

PARKING BRAKE CABLE ADJUSTMENTS Lever end: Turn the knob on the end of the brake lever to increase or decrease braking effect. (Set screw on side of adjusting knob will lock setting)

The parking brake proximity sensor should be adjusted so that the distance measured between the end of the sensor and the metal actuating bar of the brake lever is 1/8" with the parking brake in the OFF position. The sensor can be adjusted by loosening the two jamnuts and adjusting the location of the sensor.

Caliper end: Remove the cotter pin and clevis pin. Loosen the jamnut and thread the clevis on of off the cable to change the cable length. Tighten the jamnut.

The jamnut should provide ¼" of preload to the spring. Replace the clevis pin and cotter pin.

The parking brake must be kept properly adjusted at all times and should be lubricated every 500

After making adjustments verify that the sensor will activate the drive prevent circuit when the parking brake is in the OFF position.

WARNING All brake adjustments and service must be followed by a test drive using these procedures and then checked for proper caliper "float".

Do not allow the sensor and the metal actuating bar make contact with each other.

BRAKE CABLE

WASHER (2)

SPRING

CLEVIS NUT (3)

•

COTTER PIN

•

CLEVIS PIN

•

•

•

•

• CALIPER ASSEMBLY

720C-PB5

PARKING BRAKE LEVER

ADJ. NUTS ADJUSTING KNOB

• • •

LOCKING SET SCREW

• •

• DISC

CLEVIS

•

•

•

•

••

TRANSMISSION

METAL BAR

LEVER PARKBRK5

•

PARKING BRAKE ASSEMBLY 27

PROXIMITY SENSOR 724D-26

Tigercat T750 Trencher

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

28

Tigercat T750 Trencher LINING REPLACEMENT 1. Loosen inner and outer locking nuts on the center adjusting bolt just enough to slide each of the caliper torque plates away from the disc and far enough to allow removal of the carrier and lining assemblies. It may be necessary to completely remove one or both nuts from the center adjusting bolt for this procedure.

CALIPER FLOAT ADJUSTMENT 1. Using a feeler gauge, check that a gap (0.010” – 0.060”), referred to as caliper float, exists between the two mounting bolt sleeves and the caliper mounting bracket. There must be a 0.010” to 0.060” caliper float.

If adjustment is required; Loosen the two caliper mounting locknuts (behind the mounting bracket), adjust the two caliper mounting bolts and re-torque the two locking nuts to 100 to 120 lbf-ft, while holding the bolts from turning.

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

3. Slide both torque plates away from the disc, move the carrier and lining assemblies out of the pockets and remove them from the brake assembly by sliding them sideways.

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

3. Rotate the caliper actuating lever to the 5:00 o’clock position (as viewed from the front of the machine looking towards the back). This lever has six possible positions. Lift the lever off of the pins on the back of the outer cam.

Hold the cam from moving and rotate the lever to the desired position and place it back on to the pins on the back of the cam.

4. Apply a coating of "anti-seize" to the outside of the two sleeves and slide the torque plates back and forth along the sleeves to ensure that "anti-seize" gets into bores of caliper plates.

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

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.

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.

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

29

Tigercat T750 Trencher PILOT SYSTEM COMPONENTS PRESSURE PORT

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 one joystick 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.

STEERING PORT

For information on the BOOM/STEER PUMP, refer to SECTION 17 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

OPERATING DESCRIPTION

ACCUMULATOR CHARGE VALVE

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

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

SYSTEM PRESSURE

FILTER LOCATION

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.

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 30

Tigercat T750 Trencher 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 fluctuations and provides a constant 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.

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.

BRAKE ACCUMULATOR 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 12 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

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.

GAS VALVE

BODY

BLADDER

ACCUMULATORS 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.

HYDRAULIC CONNECTION ACCU-

POPPET (Seats against oil port after oil evacuation)

ACCUMULATOR (BLADDER TYPE)

WARNING

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.

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

WARNING

PILOT ACCUMULATOR

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.

The pilot accumulator receives pressure from the accumulator charge valve. The pilot accumulator has two functions. First, it dampens system

31

Tigercat T750 Trencher 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: • Boom joystick • Propel High Pressure Regulator • Left Side Plate (Left) • Left Side Plate (Right) • Right Side Plate (Left) • Right Side Plate (Right) • Spare

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) (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 boom/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

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

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

32

Tigercat T750 Trencher 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 control valve and boom joystick control valve. These two 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.

33

Tigercat T750 Trencher RELEASE PILOT SYSTEM PRESSURE

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) 34

Tigercat T750 Trencher •

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.

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

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

•

Disconnect hose from nitrogen bottle.

•

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

•

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

•

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 bottle and allow gas to flow slowly into the accumulator.

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.

HOSE*

CHECKING THE PRE-CHARGE PRESSURE

PRESSURE GAUGE*

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

ADAPTER*

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.

ADAPTER* NITROGEN BOTTLE

ACCUMULATOR

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

•

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.

CHARGING AND TESTING 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.

35

Tigercat T750 Trencher PILOT PRESSURE SETTINGS

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.

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

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

WARNING

5. Turn the pressure reducing valve adjusting screw (far left, top of manifold) all the way IN (clockwise).

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

6. 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 .

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.

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.

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

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

36

PILOT MANIFOLD

Tigercat T750 Trencher STEER RELIEF VALVE 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.

ADJUSTING SCREW LOCKNUT

TANK

PRESSURE RPGC

RELIEF CARTRIDGE 750-02

STEER RELIEF VALVE

The relief valve is adjusted by loosening the locknut and turning the hex head screw. Turning the hex head screw clockwise increases the pressure setting and counter-clockwise decreases the pressure setting. Once the pressure is set correctly, tighten the locknut and re-check the pressure setting. A gauge test port is provided at the relief valve.

37

Tigercat T750 Trencher STEERING STEER CONTROL VALVE This is a manually operated directional control valve. The steering wheel is directly connected to the steer valve through the floor of the cab.

The use of load sensing power steering and a priority valve provides smooth pressure compensated steering that is unaffected by axle response or steering rate.

The output flow of the steering control unit varies with the speed that the steering wheel is rotated.

When moving the wheel slowly the output of the steering control is low, causing the machine to steer slowly. When the wheel is turned rapidly the output of the steering control is high, causing the machine to steer much faster.

750-01

STEER CONTROL VALVE

The return oil from the cylinders, enters back in the other work port, through the spool/sleeve assembly and back to tank. A load sense line, between the steering valve and priority valve, drains oil out of the load sense port in the priority valve. The oil drains to tank through an orifice located between the sleeve and gerotor on the steer valve.

Fast steering (turning the steering wheel rapidly) is necessary when operating areas where greater maneuverability is required.

Travelling on the road requires a slower steering response (turning the steering wheel slowly), making it easier to make minor corrections when travelling in a straight line.

When the steering wheel has stopped moving, the gerotor gear continues to move and turns the sleeve until the sleeve moves to its center (neutral) position and stops sending oil to the gerotor. The valve is no longer sending oil to the cylinders.

The cylinder ports 'L' and 'R' contain built-in cylinder port relief valves and anti-cavitation valves to protect against pressure surges created by ground forces on the steered axle and vacuum (cavitation) conditions.

The speed that the steering wheel is rotated, determines the speed that the machine will turn.

Turning the steering wheel slowly causes the variable orifice to decrease in size and it will take more turns of the wheel from stop to stop. If the wheel is turned quickly the orifice opens and it will take fewer turns of the wheel from stop to stop.

OPERATING DESCRIPTION The steering control valve has a spool that is able to rotate inside a sleeve. When the steering wheel is stationary, the unit is in the neutral position and the spool is aligned in the sleeve so that oil cannot flow through the valve. The steering cylinders to the rear chassis are prevented from moving by the oil that is trapped on both sides of the pistons.

The cylinder port relief valves are factory set to 3335 psi.

When the steering wheel is turned, the spool rotates inside the sleeve and opens passages to allow oil flow through the spool/sleeve assembly.

This oil flows to the Gerotor section of the valve, causing the gerotor to rotate and then continues back into the valve and out the work port to the end of each steer cylinder.

There is a small, variable bypass orifice in the spool/sleeve assembly that allows a small amount of oil into the pressure side of the steering valve.

This will suppress the initial pressure surge when the steering wheel is partially turned. The orifice is closed off when the wheel is fully turned.

38

Tigercat T750 Trencher 'LS' LOAD SENSING PORT 'P' PRESSURE

'R' RIGHT 'L' LEFT

• ••

'T' TANK P

R

L

T

P

R

L

T

•

•• STEERING COLUMN CONNECTION

CROSS SECTION OF CYLINDER PORT RELIEF VALVE VALVES

LEFT

RIGHT

PUMP IN

PUMP RETURN (TANK)

•R

•

•T

L

•P

HOUSING

• BEARING

SPOOL

• •

•

•

•

• • •

•

STEERING COLUMN CONNECTION

• • CENTERING SPRINGS

AT027-1

SLEEVE

PIN

CHECK VALVE

DRIVE

STEER CONTROL VALVE 39

WEAR PLATE

GEROTOR RING AND STAR

• SPACER

END CAP

Tigercat T750 Trencher PRIORITY VALVE

P

The priority valve receives hydraulic oil from the boom/steer pump via the accumulator charge valve.

T

The oil then passes through the priority valve, where it is divided up to go to either the steer valve and on to the steer cylinders, or the boom valve functions.

LS

The priority valve is a feature that allows the steer circuit to have first call on oil before the boom valve functions.

EF

This control is accomplished by a load-sensing feedback circuit from the steer valve to the priority valve.

CF

PRIORITY VALVE

AT028-2

Back flow into the steering system is prevented by a check valve in the steer control valve.

By splitting the system into two independent circuits, pressure transients are isolated in each circuit and only the flow required for steering goes to the steering circuit. The remaining flow is available for the boom valve functions. This provides safe, reliable operation because the steering circuit always has flow and pressure priority.

The priority valve contains a built-in relief valve which is factory set to 2500 psi. When this relief setting is exceeded, most of the flow will be directed to the auxiliary circuit (EF).

When full oil flow is not required for steering the excess supply of oil is directed to the other circuits.

OIL 'IN' ACCUMULATOR CHARGE VALVE RELIEF VALVE CARTRIDGE

RETURN OIL TO TANK

P

•

T

LS

• AT028-1

LOAD SENSE CONNECTION TO STEER VALVE

EF

CF

HIGH PRESSURE CARRYOVER TO BOOM VALVE

TO STEER VALVE

PRIORITY VALVE AT028

40

Tigercat T750 Trencher TESTING THE STEERING OPERATION: 1. Move the skidder to a suitable, level and smooth test area, where it can be safely operated at full throttle. Grapple UP, CLOSED and ROTATED TO CENTER. Dozer blade UP. 2. With the parking brake OFF, differential locks OFF, NO service brakes applied and full throttle, turn the steering completely one way until it hits the stop..

3. Turn the steering wheel the opposite way, as SLOWLY as possible, until it hits the end stop. This should take 7 1/2 to 8 turns of the wheel.

4. Turn the wheel back to the other end stop, very slowly to verify the 7 1/2 - 8 turns.

5. Turn the wheel back to the other end stop, as fast as possible. Resistance to turning the wheel will be felt during this operation. This should take 3 1/2 to 4 turns of the wheel.

6. Turn the wheel back to the other end stop, as fast as possible to verify the 3 1/2 - 4 turns.

7. If these values are not obtained, check the priority valve and/or steering control unit.

41

Tigercat T750 Trencher 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.

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 THE OPERATOR'S MANUAL for lubrication intervals. Use only high quality, lithium based EP2 grease containing molybdenum disulphide.

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.

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.

FRONT CHASSIS

CHECK FOR MOVEMENT IN THIS JOINT AREA

267-8

REAR CHASSIS

CENTER JOINT PRELOAD ADJUSTMENT Before making any adjustments to the center joint, please follow CHECKING THE CENTER JOINT BEARING procedure in THIS SECTION.

1000 HOUR CHECK

With dial indicator still in place;

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

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).

CHECKING THE CENTER JOINT PRELOAD 1. Park the machine on level ground. Set parking brake ON and shut off engine.

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.

8. Remove the thinnest shim from the pack.

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.

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.

42

Tigercat T750 Trencher 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 43

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

Tigercat T750 Trencher BOOM JOYSTICK VALVE

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.

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).

This joystick control valve directs pilot pressure to the boom valve pilot end caps (for tilt and lift boom functions). The corresponding spool valve then shifts from its centre position and directs pump flow to operate the corresponding cylinder.

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

When the regulating stroke begins, there is a connection from port 'P' via the hole (8) in the spool and work ports 1, 2, 3 or 4 in the base of the valve, to the boom valve pilot end caps.

Pressure provided by the steer/boom pump via the pilot manifold at ports 1, 2, 3 and 4 of the joystick valve is directly proportional to the operator position of the joystick and the regulating spring characteristic.

BOOM VALVE The boom valve consists of four open center spool sections and one inlet section. 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

RR-12

Oil enters the 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).

JOYSTICK PILOT VALVE

•

•

5

• •

4 3

• •

•

2

•

1

To prevent over pressurizing of the operating circuits, each work port in the valve sections has a port relief valve.

•

A main relief valve is installed in the inlet section of the valve. The 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 THIS SECTION.

'P' PORT WORK PORTS 2 OR 4

AU013-2

SPOOL ARRANGEMENT

AU013-1

44

Tigercat T750 Trencher

TILT LEFT SIDE PLATE

LIFT 'DOWN' PORT RELIEF (2200 PSI)

LIFT 'UP' PORT RELIEF (2900 PSI)

RIGHT SIDE PLATE

LIFT BOOM

•

•

INLET GAUGE TEST PORT

•

•

MAIN RELIEF

•

INLET SECTION

BOOM CONTROL VALVE

M724D-02

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

45

Tigercat T750 Trencher LIFT BOOM CIRCUIT DESCRIPTION Two cylinders are used to raise and lower the attachment. 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.

46

Tigercat T750 Trencher

LIFT BOOM CIRCUIT 750-17

47

Tigercat T750 Trencher LIFT BOOM PRESSURE SETTINGS WARNING

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

Do not stand above or below the attachment and lift boom or between the boom and front chassis during this

Before starting this procedure, read the following safety precautions:~ • Never reach between boom crank arms or link arms during machine set-up.

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

• Wear safety glasses and safety shoes when working on shears.

5. Turn the steer relief adjusting screw all the way IN.

• Do not stand on top or inside of boom arms.

6. Turn both lift spool section port relief valve adjusting screws OUT until spring pressure is relieved then turn adjusting screws one full turn IN.

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

7. Start the engine, and set the throttle control to the IDLE position.

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

WARNING

8. Ensure that the hydraulic oil temperature is between 120°F - 140°F. 9. While holding the joystick in the LIFT UP position (fully extended), check gauge pressure reading.

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

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.

2. Set parking brake ON. Install articulation lock bar, block wheels and stop engine.

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

WARNING 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.

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

48

Tigercat T750 Trencher 10. 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.

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

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

12. Stop engine, unscrew steer relief three(3) full turns.

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

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

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

If less than 2500 psi, release pressure in base end of lift cylinders and allow attachment to sit on the ground. Stop engine and readjust the steer relief. Repeat above procedure until a gauge reading of 2500 psi is obtained.

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

49

Tigercat T750 Trencher TILT CIRCUIT DESCRIPTION Two cylinders are used to tilt the attachment 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.

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

50

Tigercat T750 Trencher

750-18

TILT CIRCUIT 51

Tigercat T750 Trencher TILT BOOM PRESSURE SETTINGS

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

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

5. Turn the steer relief adjusting screw all the way IN.

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

6. Turn both tilt spool section port relief valve adjusting screws OUT until spring pressure is relieved then turn adjusting screws one full turn IN.

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

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

• Wear safety glasses and safety shoes when working on shears.

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

• Do not stand on top or inside of boom arms.

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

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

If less than 2900 psi, lower attachment to the ground, stop engine and readjust TILT OUT port relief.

Repeat above procedure until a gauge reading of 2900 psi is obtained.

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

WARNING

10. While holding the joystick in the TILT IN position (fully retracted), check gauge pressure reading.

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 hydraulic pressures

If less than 2900 psi, lower attachment to the ground.

Stop engine and readjust TILT IN port relief. Repeat above procedure until a gauge reading of 2900 psi is obtained.

IMPORTANT

2. Set parking brake ON. Install articulation lock bar, block wheels and stop engine

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

WARNING

11. Stop engine, unscrew steer relief adjusting screw 3 full turns.

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.

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

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

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

13. While holding the joystick in the TILT IN position, check gauge pressure reading.

WARNING

If less than 2500 psi, lower attachment to the ground.

Stop engine and readjust the steer relief. Repeat above procedure until a gauge reading of 2500 psi is obtained.

Do not stand above or below the attachment and lift boom or between the boom and front chassis during this procedure while boom is elevated and unsupported.

52

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

Tigercat T750 Trencher BOOM VALVE ASSEMBLY PROCEDURE

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.

53

Tigercat T750 Trencher 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 54

Tigercat T750 Trencher ANTI-CAVITATION RELIEF VALVE ADJUSTING PROCEDURE ADJUSTING NUT

•

51055-2

JAMNUT

•

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.

55

Tigercat T750 Trencher

ENGINE MONITORING SYSTEM

7503-1A

7.

ENGINE MONITORING SYSTEM (EMS) The EMS displays various engine parameters.

The Engine Control Module (ECM) positioned on the side of the diesel engine monitors and processes engine operating parameters and diagnostic information. This information is then transmitted to the EMS. The EMS has ten (two rows of five) indicators to display system related diagnostics. A digital LCD readout displays the engine/ auxiliary parameters monitored. If one of the monitored engine parameters exceeds a preset limit, the indicator light will come ON. See CAT engine manual for further information.

8.

DISPLAY SCROLL This is a three position switch. Press and hold until the desired abbreviation is displayed on the LCD Digital Display on EMS monitor and then release to display the desired parameter.

The display can be scrolled either forward or in reverse sequence.

A B B R E V IAT IO N

PA R A M E T E R

SPD

E N G IN E S P E E D

G A -1

E N G IN E O IL P R E S S U R E

G A -2

C O O L A N T T E M P E R AT U R E

G A -3

B AT T E RY VO LTAG E

G A -4

FUEL PRESSURE

BOOST

BOOST PRESSURE

IA IR T

IN L E T A IR T E M P E R AT U R E

F U E LT

F U E L T E M P E R AT U R E

AC C R P

N OT U S ED

AC C R T

H Y D R AU L IC O IL T E M P E R AT U R E

FUEL

F U E L R AT E

HRS

E N G IN E H O U R S

LOAD

P E R C E N T O F E N G IN E L O A D

EMSCHART.EPS

56

Tigercat T750 Trencher AIR CLEANER MAINTENANCE

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

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

FILTER RESTRICTION INDICATOR

AIR PRECLEANER ENGINE AIR PRECLEANER 7502-24A

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

••

316-21 AS THE AIR SPINS, CENTRIFUGAL FORCE SEPARATES FOREIGN MATERIALS FROM THE CLEAN AIR

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

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

•

The most common and damaging servicing problems are:

•

OVER SERVICING

•

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

•

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

ONLY THE PURIFIED AIR GOES TO THE AIR FILTER

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

TURBO II PRECLEANER OPERATION

EXHAUST PORT AREA

218-21

FILTER RESTRICTION INDICATOR

PRECLEANER REAR VIEW 57

Tigercat T750 Trencher SAFETY ELEMENT (INSIDE PRIMARY ELEMENT)

PRIMARY ELEMENT 7502-6A

••

••

AIR FILTER ELEMENTS

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

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

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

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

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

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

4. Always clean the inside of the outlet tube.

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

6. Inspect the new filter for damage.

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

8. Check connections and ducts for an air tight fit.

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

58

Tigercat T750 Trencher

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

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

IMPERIAL

GRADE 5 BOLTS

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

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

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

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

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

METRIC

SIZE

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

M6 M8 M10

4.8 12 23

3.5 8.5 17

6 15 29

4.5 11 21

9 22 43

6.5 16 32

11 28 55

8.5 20 40

13 32 63

9.5 24 47

17 40 80

12 30 60

15 37 75

11.5 28 55

19 47 95

14.5 35 70

M12 M14 M16

40 63 100

29 47 73

50 80 125

37 60 92

75 120 190

55 88 140

95 150 240

70 110 175

110 175 275

80 130 200

140 225 350

105 165 225

130 205 320

95 150 240

165 260 400

120 190 300

M18 M20 M22

135 190 260

100 140 190

175 240 330

125 180 250

260 375 510

195 275 375

330 475 650

250 350 475

375 530 725

275 400 540

475 675 925

350 500 675

440 625 850

325 460 625

560 800 1075

410 580 800

M24 M27 M30

330 490 675

250 360 490

425 625 850

310 450 625

650 950 1300

475 700 950

825 1200 1650

600 875 1200

925 1350 1850

675 100 1350

1150 1700 2300

850 1250 1700

1075 1600 2150

800 1150 1600

1350 2000 2700

1000 1500 2000

M33 M36

900 1150

675 850

1150 1450

850 1075

1750 2250

1300 1650

2200 2850

1650 2100

2500 3200

1850 2350

3150 4050

2350 3000

2900 3750

2150 2750

3700 4750

2750 3500

ISSUE 3 800

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

59

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

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