VALVE GP-RELIEF 6I9806 - Caterpillar

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 operating the machine.
Move the machine to a smooth horizontal location.
Engage the parking brake and shift the transmission to the NEUTRAL position.
Start the engine. Warm the transmission oil to normal operating temperature of approximately 75° to 105°C (167° to 220°F).ReferenceFor more information about preparing a machine for troubleshooting, refer to the Service Manual module Testing and Adjusting, "Machine Preparation for Troubleshooting".
Ensure that the work tool is positioned on the ground.
Fully depress the right side service brake pedal. Shift the transmission direction control and speed control to the FOURTH SPEED FORWARD position. Hold the brake pedal in the depressed position for the duration of the test.Note: Do not use the left brake pedal for this test.
Illustration 1 g02938576
View of dash panel
Fully depress the governor control pedal. Allow the engine rpm to stabilize. Then, observe the tachometer. The correct torque converter stall speed is 2185 65 rpm.
Shift the transmission direction control and speed control to the NEUTRAL position.Note: Allow the engine coolant and the transmission oil to cool. Wait at least 2 minutes between tests in order to allow the transmission oil to cool.If the torque converter stall speed is too high, the engine power output could be too high.
If the torque converter stall speed is too low, the engine may not be developing full power. There may be a parasitic load on the engine.