950G Wheel Loader, 962G Wheel Loader and IT62G Integrated Toolcarrier Power Train Caterpillar

Incorrect transmission clutch pressure adversely affects the life of the transmission. Submodes 31 through 36 are used in order to set the transmission clutch pressure of each clutch. In this process, the service technician adjusts the electrical current that is sent to each transmission clutch modulating valve in order to obtain the specified transmission clutch pressure. The calibration of the transmission clutch pressure should be performed prior to the transmission clutch fill calibration (submode 40).

The transmission system must be calibrated if any of the following conditions have occurred:

• A transmission clutch modulating valve has been replaced or cleaned.

• A different power train ECM has been installed.

• A transmission clutch has been rebuilt.

• The transmission clutch does not shift correctly.

Illustration 1	g00779337
Modulating Valves (Transmission Clutch) (1) Number 1 transmission clutch modulating valve (Reverse). (2) Number 2 transmission clutch modulating valve (Forward). (3) Number 3 transmission clutch modulating valve (Fourth speed). (4) Number 4 transmission clutch modulating valve (Third speed). (5) Number 5 transmission clutch modulating valve (Second speed). (6) Number 6 transmission clutch modulating valve (First speed).

Table 1

Error Codes for the Calibration of the Transmission Clutch
E01	The Clutch Solenoid or the Speed Sensor has an Active Fault.
E04	The transmission Direction Control Switch (If Equipped) is Not in the Neutral Position.
	The transmission Direction and Speed Control Lever (If Equipped) is Not in the Neutral Position.
E05	Temperature of the Transmission Oil is Below the Fault Threshold. ( 40°C (104°F))
E06	The Engine Speed is Below the Fault Threshold of 1800 rpm.
E07	The Parking Brake Is Not Engaged.
E09	Machine Speed Is Not Zero.

During calibration of the transmission clutch pressure, error codes (EXX) can occur. The error codes will appear in the display area of the Caterpillar Monitoring System. The error codes will appear if a problem occurs during the calibration.

Procedure

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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.

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Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.

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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 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.

1. Park the machine on a smooth, level surface.

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Illustration 2	g00779335
Transmission Direction and Speed Control

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Illustration 3	g00779336
Transmission Directional Control Switch

2. Shift transmission direction and speed control lever (7) (if equipped) to the NEUTRAL position and to any speed position. Shift the transmission direction control switch (8) (if equipped) to the NEUTRAL position.

3. Lower the bucket and/or the attachment to 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. Shut off the engine.

8. Allow only authorized personnel on the machine. Keep unauthorized personnel off the machine and in clear sight of the operator.
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   Table 2

   Required Tools
   Part Number	Description	Quantity
   4C-8195	Control Service Tool	1
   1U-5481	Pressure Gauge Group	1
   1U-5482	Pressure Adapter Group	1

Note: The steps of this procedure must be performed exactly, as described below. This procedure may terminate if any unknown functions or any unexpected functions are activated. This procedure may terminate if a fault (CID FMI) is present. Do not move any switch positions, any levers or any pedals unless you are instructed differently.

1. Make sure that transmission direction and speed control lever (7) (if equipped) is in the NEUTRAL position. Make sure that transmission direction control switch (8) (if equipped) is in the NEUTRAL position.

2. Make sure that the parking brake is engaged.

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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.

3. Install the correct hose assembly from 1U-5482 Pressure Adapter Group on the pressure tap of the transmission clutch modulating valve of the clutch that is being calibrated. 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 .

4. Start the engine and operate the engine at low idle.

Note: If a new transmission clutch modulating valve was installed, shift the transmission for at least 12 times into a speed or a direction that uses the transmission clutch modulating valve. Refer to Illustration 1 in order to identify the transmission clutch modulating valve and the corresponding clutch. Allow sufficient time for the corresponding clutch to be fully pressurized.

5. Increase the engine speed to high idle.

6. Warm the transmission oil to at least 40°C (104°F).
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   Table 3

   Clutch Engagement Calibration Submodes
   Submode 31	Number 1 Clutch Engagement Reverse
   Submode 32	Number 2 Clutch Engagement Forward
   Submode 33	Number 3 Clutch Engagement Fourth Speed
   Submode 34	Number 4 Clutch Engagement Third Speed
   Submode 35	Number 5 Clutch Engagement Second Speed
   Submode 36	Number 6 Clutch Engagement First Speed

7. Use the 4C-8195 Control Service Tool to enter Transmission Calibration Mode "8". Then enter the submode that corresponds to the clutch that is being calibrated. Enter the submode by using the "SCROLL" switch.
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   Table 4

   Engagement Pressures of the Transmission Clutches
   Model	Clutch 1	Clutch 2	Clutch 3	Clutch 4	Clutch 5	Clutch 6
   950G	2760 ± 70 kPa (400 ± 10 psi)	2760 ± 70 kPa (400 ± 10 psi)	2690 ± 70 kPa (390 ± 10 psi)	2690 ± 70 kPa (390 ± 10 psi)	2210 ± 70 kPa (320 ± 10 psi)	2690 ± 70 kPa (390 ± 10 psi)
   962G/IT62G	2760 ± 70 kPa (400 ± 10 psi)	2760 ± 70 kPa (400 ± 10 psi)	2690± 70 kPa (390 ± 10 psi)	2690 ± 70 kPa (390 ± 10 psi)	2210 ± 70 kPa (320 ± 10 psi)	2690± 70 kPa (390 ± 10 psi)

8. The Caterpillar Monitoring System will display the correct pressure for each clutch, when the conditions are correct. The units of the value that is displayed is shown in one-tenth of kPa. Multiply the value that is shown in the display by 10 to determine the true specified value in kPa. Record the value.

   Make the following adjustments in order to calibrate the clutch pressures. Refer to Table 4.

   Note: The Caterpillar Monitoring System will not display the correct pressure for each clutch, when the conditions are not correct. Instead, an error code (EXX) appears. The calibration will not run until all necessary conditions are met. Correct the error code and perform these procedures again. Refer to table 1 for a list of the error codes and the meaning of the error codes.

9. When all conditions are met and the pressure is shown in the display area, shift transmission direction and speed control lever (7) (if equipped) to the FORWARD position. When all conditions are met and the pressure is shown in the display area, shift transmission direction control switch (8) (if equipped) to the FORWARD position. This pressurizes the clutch that is being calibrated.

10. The value that is shown in the display area will change and a number that corresponds to the electrical current of the particular transmission clutch modulating valve is shown. The INCREMENT (+) and DECREMENT (-) positions of the "CLEAR" switch can now be used to adjust the electrical current of the transmission clutch modulating valve. The electrical current of the transmission clutch modulating valve controls the transmission clutch pressure.

    Use the "CLEAR" switch in order to adjust the transmission clutch pressure. Adjust the transmission clutch pressure until the pressure gauge reading matches the specified transmission clutch pressure from Step 8.

11. Shift transmission direction and speed control lever (7) (if equipped) to the NEUTRAL position. Shift transmission direction control switch (8) (if equipped) to the NEUTRAL position. This completes the calibration of the selected clutch.

12. To exit this submode, use the "SCROLL" switch to scroll to the submode that corresponds to the next clutch that needs to be calibrated, or scroll to submode 40. Refer to Table 3 for a list of the submodes for calibration of the transmission clutch engagement. Submode 40 is used in order to calibrate the transmission clutch fill. Exit the Transmission Calibration Mode by using the "MODE" switch.

Reference: For more information on submode 40, refer to Testing and Adjusting, "Fill Time for the Transmission Clutch - Calibrate" for the machine that is being serviced.

Reference: For more information on the Caterpillar Monitoring System, refer to Systems Operation, "Monitoring System (Power Train Functions)" for the machine that is being serviced.