Transmission Pressures - Test And Adjust

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Pruebas y Ajustes 950H Wheel Loader, 962H Wheel Loader and IT62H Integrated Toolcarrier Power Train Número de medio -RENR8866-06

 

Fecha de publicación -01/04/2010

Fecha de actualización -08/04/2010

 

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Transmission Pressures - Test and Adjust SMCS - 3030-025-PX; 3030-081-PX; 7513-PK; 7554-PK

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. Prevent possible injury by performing the procedure that follows before working on the machine.

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 Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates.

1. Park the machine on a smooth, level surface. 2. Place the transmission direction and speed control lever (if equipped) in the NEUTRAL position and in any speed position. Shift the transmission direction control switch (if equipped) to the NEUTRAL position. 3. Lower the work tool to ground. 4. Engage the parking brake. 5. Place blocks in front of the wheels and behind the wheels.

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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.

Table 1 Required Tools Part Number 198-4240 ( 1 )  The

(1)

Description

Qty

Digital Pressure Indicator

1

1U-5481 Pressure Gauge Group is also available.

Test Procedures Remote Pressure Taps

Illustration 1 Location of the remote pressure taps

g01099999

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Illustration 2 Remote pressure taps

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(1) Transmission pressure tap for clutch 1 (2) Transmission pressure tap for clutch 2 (3) Transmission pressure tap for clutch 3 (4) Transmission pressure tap for clutch 4 (5) Transmission pressure tap for clutch 5 (6) Transmission pressure tap for clutch 6 (7) Torque converter inlet pressure tap (8) Torque converter outlet pressure tap (9) Transmission lubrication pressure tap (10) Transmission pump pressure tap

The remote pressure taps for the torque converter and the transmission are located on the right side of the machine under the cab.

Test for the Transmission Clutch Solenoid Modulating Valve This test will determine whether the solenoid coil is energized and the solenoid plunger is shifting in order to permit the flow of oil through the transmission clutch solenoid modulating valve. Hearing the click of a solenoid or using a screwdriver to check that the solenoid coil is energized does not ensure that the solenoid plunger has shifted. The following test will determine if the solenoid plunger is shifting. Table 2 Speed Range and Direction

Engaged Clutches and Energized Solenoids

Fourth Speed Forward

3 and 2

Third Speed Forward

4 and 2

Second Speed Forward

5 and 2

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First Speed Forward

6 and 2

Neutral

3

First Speed Reverse

6 and 1

Second Speed Reverse

5 and 1

Third Speed Reverse

4 and 1

Fourth Speed Reverse

3 and 1

1. Install the correct hose assembly from the 198-4240 Digital Pressure Indicator onto pressure tap (1) through pressure tap (6) . 2. Engage the parking brake. Shift the transmission direction and speed control lever (if equipped) to the NEUTRAL position. Shift the transmission direction control switch (if equipped) to the NEUTRAL position. Start the engine and operate the engine at low idle. 3. Use the transmission neutralizer override switch in order to disengage the transmission neutralizer. 4. Depress the right service brake pedal and hold the right service brake pedal. Make sure that the machine is in first speed. Release the parking brake. Watch the pressure gauges. Move the transmission direction and speed control lever (if equipped) from the NEUTRAL position to the FORWARD position. Shift the transmission direction control switch (if equipped) from the NEUTRAL position to the FORWARD position. The pressure on the pressure gauge for the Number 2 clutch should rise. The pressure on the pressure gauge for the Number 6 clutch should rise. With the transmission in the FORWARD position, shift through the remaining forward speeds and return to the FIRST SPEED position. Use the transmission direction and speed control lever or the transmission upshift switch to change speeds. The same pressure rise should be observed in each respective speed. This checks the operation of all the speed clutches. 5. Perform Step 4 for all reverse speeds. The same pressure rise should be noted in all reverse speeds. If a pressure rise is noted, the solenoid and the related electrical circuit are functioning. If a pressure rise is not noted, use a screwdriver to check that the solenoid coil is energized. If the screwdriver is attracted to the solenoid coil, this indicates that the solenoid coil is energized. The problem is in the solenoid cartridge. The problem could be a bent solenoid stem, a screen that is dirty or plugged, or a spring that is weak or broken. If the screwdriver does not indicate that the solenoid coil is energized, the problem is in the electrical circuit. ReferenceFor additional information about calibrating the transmission clutch solenoid modulating valves, refer to the Service Manual module Testing and Adjusting, "Calibration and Programming" for the machine that is being serviced. ReferenceFor additional information about calibrating the transmission clutch solenoid modulating valves, refer to the Service Manual module Testing and Adjusting, "Fill Time for the Transmission Clutch - Calibrate" for the machine that is being serviced. ReferenceFor additional information about electrical system troubleshooting, refer to the Service Manual module Testing and Adjusting, "Troubleshooting Diagnostic Codes" for the machine that is being serviced.

Test for the Transmission Clutch Pressure

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Use the following procedure to check the pressure of the direction clutch oil and the speed clutch oil. 1. Install the correct hose assembly from the 198-4240 Digital Pressure Indicator on pressure tap (1) through pressure tap (6) . 2. Engage the parking brake. Shift the transmission direction and speed control lever (if equipped) to the NEUTRAL position. Shift the transmission direction control switch (if equipped) to the NEUTRAL position. Start the engine and operate the engine at low idle. 3. Use the transmission neutralizer override switch in order to disengage the transmission neutralizer. 4. Depress the right service brake pedal and hold the right service brake pedal. Make sure that the machine is in first speed. Release the parking brake. Watch the pressure gauges. Shift the transmission direction and speed control lever (if equipped) from the NEUTRAL position to the FORWARD position. Shift the transmission direction control switch (if equipped) from the NEUTRAL position to the FORWARD position. Increase the engine speed to high idle. Make sure that the transmission oil is at normal operating temperature. The pressure on the pressure gauge for the Number 2 clutch should rise. The pressure on the pressure gauge for the Number 6 clutch should rise. The pressure readings must be within the values in Table 4. With the transmission in the FORWARD position, shift through the remaining forward speeds and return to the FIRST SPEED position. Use the transmission direction and speed control lever (if equipped) or the transmission upshift switch (if equipped) to change speeds. The pressure reading for each energized clutch must be within the values in Table 4. This checks the pressure of all the speed clutches. 5. Perform Step 4 for all reverse speeds. The same pressure levels should be noted in all reverse speeds.

Adjustments for the Transmission Clutch Pressure If the pressure reading for each energized clutch is not within the values in Table 4, the transmission clutch solenoid modulating valve may need to be replaced or the pump pressure may need adjustment. ReferenceFor additional information about calibrating the transmission clutch solenoid modulating valves, refer to the Service Manual module Testing and Adjusting, "Fill Time for the Transmission Clutch - Calibrate" for the machine that is being serviced. ReferenceFor additional information about electrical system troubleshooting, refer to the Service Manual module Testing and Adjusting, "Troubleshooting Diagnostic Codes" for the machine that is being serviced.

Test for the Lubrication Oil Pressure Use the following procedure to check the pressure of the transmission lubrication oil. The pressure tap for the transmission lubrication oil is located on the right side of the machine under the cab behind an access panel. Refer to Illustration 1 and Illustration 2. 1. Install the correct hose assembly from the 198-4240 Digital Pressure Indicator on pressure tap (9) . 2. Start the engine and operate the engine at high idle. Observe the pressure gauge. With the oil at normal operating temperature, the lubrication oil pressure must be within the values in Table 4.

Test of the Torque Converter Outlet Pressure Use the following procedure to check oil pressure at the torque converter outlet.

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1. Install the correct hose assembly from the 198-4240 Digital Pressure Indicator on pressure tap (8) . 2. Start the engine and run the machine at the torque converter stall. With the oil at normal operating temperature, the torque converter outlet pressure must be within the values in Table 4.

Test for the Transmission Oil Pump Pressure Use the following procedure to check transmission oil pump pressure. 1. Install the correct hose assembly from the 198-4240 Digital Pressure Indicator on pressure tap (10) . 2. Start the engine and operate the engine at high idle. Observe the pressure gauges. With the oil at normal operating temperature, the transmission oil pump pressure must be within the values in Table 4.

Adjustment for the Transmission Oil Pump Pressure The transmission hydraulic control relief valve is located on the left side of the machine on the torque converter housing.

Illustration 3 Transmission Hydraulic Control Relief Valve

g00500335

(L) Cover

Illustration 4 Transmission Hydraulic Control Relief Valve

g00500338

(M) Adjustment screw

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If the transmission oil pump pressure at pressure tap (10) is not within the values in Table 4, adjust the spring of the transmission hydraulic control relief valve. Use the following procedure. 1. Remove cover (L) . 2. Turn adjustment screw (M) in the proper direction. Turning the adjustment screw clockwise increases pump pressure. Turning the adjustment screw counterclockwise decreases pump pressure. One full turn of the adjustment screw changes pump pressure 160 kPa (23 psi). 3. Install cover (L) . 4. Check the transmission oil pump pressure again. Make sure that the transmission oil pump pressure is within the value in Table 4.

Test for the Torque Converter Inlet Pressure 1. Install the correct hose assembly from the 198-4240 Digital Pressure Indicator on pressure tap (7) . 2. Start the engine and operate the engine at high idle. Observe the pressure gauge. With the oil at normal operating temperature, the torque converter inlet pressure must be within the values in Table 4.

Transmission and Torque Converter Pressures Table 3 Transmission Pressures for the 950H and 962H Wheel Loaders and the IT62H Integrated Toolcarrier (1) Pressure Tap (1) Number 1 clutch pressure (2) Number 2 clutch pressure (3) Number 3 clutch pressure (4) Number 4 clutch pressure (5) Number 5 clutch pressure (6) Number 6 clutch pressure (7) Torque converter inlet pressure (8) Torque converter outlet pressure (9) Transmission lubrication pressure (10) Transmission oil pump pressure

Specification 2758 ± 140 kPa (400 ± 20 psi) 2758 ± 140 kPa (400 ± 20 psi) 2758 ± 140 kPa (400 ± 20 psi) 2758 ± 140 kPa (400 ± 20 psi) 2310 ± 140 kPa (335 ± 20 psi) 2758 ± 140 kPa (400 ± 20 psi) 925 ± 50 kPa (135 ± 7.5 psi) 415 ± 140 kPa (60 ± 20 psi) 105 kPa (15 psi) (minimum) 2758 ± 70 kPa (400 ± 10 psi)

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( 1 )  Oil

pressure at high idle.

Copyright 1993 - 2013 Caterpillar Inc. Todos los derechos reservados. Red privada para licenciados del SIS.

  Mon May 20 04:06:23 UTC+0200 2013

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