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/09/12 844H Wheel Tractor BTW00001-UP (MACHINE) POWERED BY C27 Engine(SEBP3849 - 28) - Document

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Producto: WHEEL DOZERModelo: 844H WHEEL DOZER BTWConfiguracin: 844H Whee l Tractor BTW00001-UP (MACHINE)POWERED BY C27 Engine

Pruebas y Ajustes990H Wheel Loader and 844HWheel Dozer Power TrainNmero de medio -RENR8811-03 Fecha de publicacin -01/10/2009 Fecha de actualizacin -07/10/2009

i0174563

Torque Converter Lockup Clutch Pressure - Test

SMCS - 3102-081-PX


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Illustration 1 g0085806

Hydraulic Sys tem Schematic

(1) Priority valve

(2) Modulating valve (lockup clutch)

(3) Modulating valve (impeller clutch)

(4) Oil filter

(5) Oil pump

(6) Lockup clutch

(7) Magnetic screen

(8) Transmiss ion hydraulic control

(9) Oil cooler

(10) Torque converter


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(11) Impeller clutch

(12) Reservoir in output t ransfer gear case

(13) Planetary lubrication

(14) Outlet line from oil cooler to planetary lubrication

(15) Torque converter outlet relief valve

(A) Press ure tap for lockup clutch

(B) Oil pump output pressure tap P1

(C) Torque converter inlet pressure tap P3

(D) Pressure tap for impeller clutch

(F) Lubrication pressure tap

(G) Torque converter outlet pressure tap


Torque Converter

(A) Press ure tap for lockup clutch

(D) Pressure tap for impeller clutch


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Transmission

(C) Torque converter inlet pressure tap P3


Torque Converter Cover

(G) Torque converter outlet pressure tap

NOTICE

Care must be taken to ensure that fluids are contained during

performance of inspection, maintenance, testing, adjusting and repair of

the product. Be prepared to collect the fluid with suitable containers

before opening any compartment or disassembling any component

containing fluids.

Refer to Special Publication, NENG2500, "Caterpillar Tools and ShopProducts Guide" for tools and supplies suitable to collect and contain

fluids on Caterpillar products.

Dispose of all fluids according to local regulations and mandates.

Personal in ur or death can result from sudden machine movement.


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Sudden movement of the machine can cause injury to persons on or near

the machine.

Prevent possible injury by performing the procedure that follows before

working on the machine.

1. Park the machine on a smooth level surface.

2. Shift the transmission direction control to the NEUTRAL position.

3. Lower the bucket and/or the work tool to the ground. Lower the blade and/or the work tool to the ground.

4. Engage the parking brake.

5. Place blocks in front of the wheels and behind the wheels.

6. Install the steering frame lock.

7. Allow only authorized personnel on the machine. Keep unauthorized personnel off the machine and in clear

sight of the operator.

Note: All tests and all adjustments must be made while the transmission oil is at normal operating temperature.

NOTICE

Do not connect or disconnect hose fittings to or from the quick disconnect

nipples when there is pressure in the system. This will prevent damage to

the seals that are in the fitting.


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Outlet Relief Valve

(15) Torque converter outlet relief valve

(16) Spacers

Table 1

Torque Converter Pressure

Pressure PressureTap

Pressure at High Idle Adjustment

Lockup

Clutch(A)

Stabilized pressure with an activated solenoid is

2030 240 kPa (295 35 psi).

Pressure is less than

170 kPa (25 psi) when the solenoid is not activated.

-

Torque

Converter

Inlet P3

(C)The maximum pressure with cold oil is

930 kPa (135 psi).-

Impeller

Clutch(D)

The impeller clutch top pressure must be a minimum of

1950 kPa (285 psi).

Pressure with the left brake pedal fully depressed is

220 150 kPa (32 22 psi).

-

Torque

Converter

Outlet

(G)

Maximum pressure is

550 kPa (80 psi).

Minimum pressure is

415 kPa (60 psi).

(These pressures are for a machine in third speed, withactivated brakes, with installed axle shafts, and with the

converter in a stall condition.)

Add spacers (16)

or remove spacers

(16).

Table 2

Pressure Change for One Spacer (1)

Description Thickness Pressure Change Part


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5M-9622 Spacer

1.60 mm (.063 inch) 31.2 kPa (4.53 psi)

Output Relief Valve (15)5M-9623 Spacer

0.91 mm (.036 inch) 18.2 kPa (2.64 psi)

5M-9624 Spacer

0.25 mm (.010 inch) 5.0 kPa (.73 psi)( 1 ) Before an adjustment is made to outlet relief valve (15), make sure that the valve springs are not weak or broken.

Table 3

Required Tools

Part Number Description Quantity

1U-5481 (1) Pressure Gauge Group 1

1U-5482 Pressure Adapter Group 1

4C-8195 Control Service Tool 1

7X-1701 Communication Adapter 1

( 1 ) The 198-4240 Press ure Indicator Tool Gp is also available.

Lockup Clutch Disengaged (Minimum clutch pressure)

The drive shaft rotates between the torque converter and the transmission

whenever the engine is running. Contact with the rotating shaft can result

in personal injury or death.

The rotating shaft is located under the implement and steering pumps. Do

not allow personnel into the pump bay area behind the cab when the

engine is running.

Personal injury or death can result from sudden machine movement.

Sudden movement of the machine can cause injury to persons on or near

the machine.

To prevent injury or death, make sure that the area around the machine is

clear of personnel and obstructions before moving the machine to perform


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the test that follows.

1. Install a hose and a 4130 kPa (600 psi) pressure gauge on pressure tap (A) .

2. Engage the parking brake and shift the transmission to the NEUTRAL position. Start the engine and run the

engine at high idle.

3. Observe the pressure gauge. The pressure reading on the gauge must be 170 kPa (25 psi) or less.

Lockup Clutch Engaged (Maximum stabilized pressure)

The drive shaft rotates between the torque converter and the transmission

whenever the engine is running. Contact with the rotating shaft can result

in personal injury or death.

The rotating shaft is located under the implement and steering pumps. Do

not allow personnel into the pump bay area behind the cab when the

engine is running.

Personal injury or death can result from sudden machine movement.

Sudden movement of the machine can cause injury to persons on or nearthe machine.

To prevent injury or death, make sure that the area around the machine is

clear of personnel and obstructions before moving the machine to perform

the test that follows.

1. Install a hose and a 4130 kPa (600 psi) pressure gauge on pressure tap (A) .

2. Move the on/off switch for the lockup clutch to the ON position.

3. Engage the parking brake and place the transmission in the NEUTRAL position. Start the engine.

4. Apply the service brakes and release the parking brake. Shift the machine into the FIRST SPEED

FORWARD position.

5. Operate the machine at maximum speed and observe the pressure reading on the gauge. Make sure that the

left service brake pedal or the right service brake pedal are not depressed. If the left service brake pedal or

the right service brake pedal are depressed the lockup clutch will not engage. The maximum stabilized

pressure must be 2030 240 kPa (295 35 psi).


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Mon Sep 24 2012 20:39:02 GMT-0400 (Hora est. Sudam rica Pacfico)

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