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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

i0165333

Transmission Pressures - Test and Adjust

SMCS - 3030-025-PX ; 3030-081-PX ; 3073-025-PX ; 3073-081-PX


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Illustration 1 g0085054

Transmiss ion Hydraulic Controls in the NEUTRAL pos ition and with the Engine Stopped.

(1) Number 2 clutch solenoid


(3) Priority valve




(7) Flow control orifice


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(8) Lockup clutch solenoid valve

(9) Impeller clutch solenoid valve

(10) Slug

(11) Converter inlet ratio valve

(12) Slug

(13) Modulating relief valve

(14) Lockup clutch

(15) Impeller clutch

(16) Direction s election spool

(17) Torque converter

(18) Torque converter outlet relief valve

(19) Selector spool for first speed and for third speed

(20) Transmission oil filter

(21) Pressure differential valve

(22) Load piston

(23) Flow control orifice

(24) Transmission oil pump

(25) Oil cooler

(26) Magnetic s creen

(27) Lubrication passage for t ransmiss ion

(28) Selector spool for second speed

(29) Reservoir

(A) Press ure tap for the oil pump

(B) Press ure tap for lockup clutch

(C) Pressure tap for impeller clutch

(D) Torque converter inlet pressure tap P3

(E) Speed clutch pressure tap P1

(F) Direction clutch pressure tap P2

(G) Torque converter outlet pressure tap

(H) Transmiss ion lubrication pressure tap

NOTICE


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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 Shop

Products 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 injury or death can result from sudden machine movement.

Sudden movement of the machine can cause injury to persons on or nearthe 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 switch 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. Remove the front axle shafts and rear axle shafts except for stall tests.

8. 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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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. Donot allow personnel into the pump bay area behind the cab when the

engine is running.

Table 1

Required Tools

Part Number Description Quantity

1U-5481(1)

Pressure Gauge Group 1

1U-5482 Pressure Adapter Group 1

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

Test Procedures

Use the following procedure in order to check the pressure of the direction clutch oil, the speed clutch oil, and the oi

pump output.

Table 2

Transmission Speed Selection Engaged Clutches

Third Speed Forward Number 2 and Number 3

Second Speed Forward Number 2 and Number 4

First Speed Forward Number 2 and Number 5

Neutral Number 3

First Speed Reverse Number 1 and Number 5

Second Speed Reverse Number 1 and Number 4

Third Speed Reverse Number 1 and Number 3


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Transmission

(A) Oil pump output pressure tap




Transmission Control Valve



(J) Plug for the load piston LP

1. Install the correct hose assembly from 1U-5482 Pressure Adapter Group on the following pressure taps: (A),

(E) and (F). Attach the opposite end of the hose assembly to the 0 to 3400 kPa (0 to 580 psi) pressure

gauge in the 1U-5481 Pressure Gauge Group .

2. Engage the parking brake. Shift the transmission direction control switch to the NEUTRAL position. Shift the

transmission upshift switch to the FIRST SPEED position. Start the engine and operate the engine at low idle.

3. Depress the right service brake pedal and hold the right service brake pedal. Release the parking brake.

Watch the pressure gauges. Shift the transmission direction control switch from the NEUTRAL position to the


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FORWARD position. Increase the engine speed to high idle. Make sure that the transmission oil is at normal

operating temperature. The needle on the pressure gauge for the Number 2 clutch should rise. The needle on

the pressure gauge for the Number 5 clutch should rise. The pressure readings must match the values that are

found in Table 3.

With the transmission in the FORWARD position, shift through the remaining forward speeds and return to

the FIRST SPEED position. Use the transmission upshift switch and the transmission downshift switch in

order to change speeds. The pressure reading for each energized clutch must match the values that are found

in Table 3. This checks the pressure of all the speed clutches.

4. Perform Step 3 for all reverse speeds. The same pressure levels should be noted in all reverse speeds.

Lubrication Oil Pressure Test

Use the following procedure to check the pressure of the transmission lubrication oil.

Illustration 4 g00396223Transmiss ion Cover

(H) Transmiss ion lubrication pressure tap

1. Install the correct hose assembly from 1U-5482 Pressure Adapter Group on pressure tap (H). Attach the

opposite end of the hose assembly to the 0 to 400 kPa (0 to 58 psi) pressure gauge in the 1U-5481 Pressure

Gauge Group .

2. Start the engine and operate the engine at high idle. The oil must be at normal operating temperature. Observe

the pressure gauge. The pressure reading for the lubrication oil must match the values that are found in Table

3.

Transmission Pressures

Table 3

Transmission Pressure

Pressure

Position of Governor Control Lever

Adjustment


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Pressure Tap Pressure at Low Idle Pressure at High Idle

Oil Pump (A)This pressure is identical to

speed clutch pressure P1.

This pressure is identical to speed

clutch pressure P1.-

SpeedClutch P1

(Initial

Pressure)

(E)

The pressure is

530 35 kPa (77 5 psi)when the direction switch is in

the NEUTRAL position and

plug (J) for the load piston is

removed.

-

Add

spacers (30)

or remove

spacers

(30).

Speed

Clutch P1(E)

This pressure must be more

than

2000 kPa (290 psi). Plug (J)

for the load piston is installed.

This pressure is

2550 140 kPa (370 20 psi) when

the direction switch is in FORWARD

or in REVERSE and any speed is

selected. Plug (J) for the load piston isinstalled.

-

Direction

Clutch P2(F)

This pressure is

380 35 kPa (55 5 psi)

lower than the speed clutch

pressure at pressure tap (E).

Plug (J) for the load piston is

installed.

This pressure is

380 35 kPa (55 5 psi) lower than

the speed clutch pressure at pressure

tap (E). Plug (J) for the load piston is

installed.

-

Transmission

Lubrication

Oil

(H) - This pressure is approximately138 35 kPa (20 5 psi).

-

Transmission Pressures Adjustments


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Transmiss ion Selector and Press ure Control Valve

(22) Load piston

(30) Spacers

Table 4

Pressure Change for the Valve (1)

Description Thickness Pressure Change Location of Spacers

5M-9622 Spacer (30)1.58 mm (.062 inch) 98 kPa (14.2 psi)

Load Piston (22)5M-9623 Spacer (30)0.91 mm (.036 inch) 57 kPa (8.20 psi)

5M-9624 Spacer (30)0.25 mm (.010 inch) 16 kPa (2.29 psi)

( 1 ) Result of the addition of one spacer or the removal of one spacer to the valve.

Copyright 1993 - 2012 Caterpillar Inc.Todos los derechos reservados.Red privada para licenciados del SIS.

Mon Sep 24 2012 20:37:52 GMT-0400 (Hora est. Sudam rica Pacfico)

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