PUMP GP-PISTON 2703947 - Caterpillar

Personal injury can result if the machine moves while testing.If the machine begins to move during test, reduce the engine speed immediately and engage the parking brake.
Check the pressures.
Start the engine. Operate the engine at low idle.
Push down on the service brake pedal to engage the brakes.
Disengage the parking brake.
Shift the transmission into the NEUTRAL position to check these clutches: No. 1, No. 2, No. 4 and No. 5. No. 3 clutch should be the only clutch that is engaged.
Shift the transmission into FIRST GEAR FORWARD to check No. 3 clutch. No. 2 clutch and No. 5 clutch should be engaged.
Measure the pressure for the clutch that does not release.
ReferenceFor D5R2 models, refer to the latest revision of Specifications, Systems Operation/Testing, and Adjusting, UENR4119, "Transmission Clutch Pressure - Test".ReferenceFor D6R2 models, refer to the latest revision of Specifications, Systems Operation/Testing, and Adjusting, UENR4109, "Transmission Clutch Pressure - Test".Expected Results
When the clutches are released, all clutch pressures are less than 138 kPa (20 psi). Results
OK: Stop. The clutch releases properly.
NOT OK: Proceed to Step 2.
Check the bolt torques for the transmission modulating valves.
Check the torque of the bolts that hold the transmission modulating valves to the transmission control valve.Expected Results
The torque for the valves is correct.Results
OK: Proceed to Step 3.
NOT OK: Tighten the bolts or loosen the bolts to the proper torque. Check the operation of the machine for the original problem. If conditions are not resolved, proceed to Step 3.
Replace the transmission modulating valve.
Replace the transmission modulating valve for the clutch that does not release.
Calibrate the transmission modulating valves.
ReferenceFor D5R2 models, refer to the latest revision of Specifications, Systems Operation/Testing, and Adjusting, UENR4119, "Calibration".ReferenceFor D6R2 models, refer to the latest revision of Specifications, Systems Operation/Testing, and Adjusting, UENR4109, "Calibration".
Check the operation of the machine for the original problem.Expected Results
The original problem is resolved.Results
OK: Stop.
NOT OK: If the original problem is still present, the cause of the problem is uncertain. Call technical support with the information that has been gathered.The Transmission Clutch Does Not Engage
Follow this procedure if the machine does not operate in specific gears.
Check the system pressure.
ReferenceFor D5R2 models, refer to the latest revision of Specifications, Systems Operation/Testing, and Adjusting, UENR4119, "Relief Valve (Transmission) - Test and Adjust".ReferenceFor D6R2 models, refer to the latest revision of Specifications, Systems Operation/Testing, and Adjusting, UENR4109, "Relief Valve (Transmission) - Test and Adjust".Expected Results
The system pressure is correct.Results
OK: If the original problem has not been is not resolved, proceed to Step 3.
NOT OK: The cause of the problem may be the adjustment of the main relief valve. The main relief valve maintains the system pressure in the control section of the power train oil pump. Proceed to Step 2.
Adjust the pressure