PISTON AS 3437301 - Caterpillar

Personal injury or death can result from sudden machine movement.Sudden movement of the machine or the release of oil under pressure can cause injury to persons on or near the machine. To prevent possible injury before testing and adjusting the power train system, perform the procedure in the Testing and Adjusting, Troubleshooting, "General Information" section.
This test will show the following conditions if the conditions exist:
The transmission solenoids are leaking.
The transmission clutches engage properly.
The torque converter lockup clutch is stuck.Procedure
Disconnect all the electrical harness connectors from the upshift solenoid, the downshift solenoid, and the lockup clutch solenoid.
Engage the parking brake and the service brakes
Perform the shift sequence that follows for each reverse and forward speeds.
Regularly check the transmission oil temperature. Do not allow the transmission oil temperature to increase too much during the shift sequence. The torque converter and the transmission can be damaged by high oil temperatures. Watch for any temperature warnings. If the oil temperature becomes too hot, put the transmission in NEUTRAL. The engine should be run at approximately 1500 rpm until the temperature returns to the normal operating range.
Shift Sequence
Manually rotate the transmission rotary selector spool to the desired speed. After the manual shift is performed, move away from the machine. Note: Refer to Testing and Adjusting, "Transmission Hydraulic Control Clutch Pressure - Test", for the procedure on performing manual shifts.Note: In order to maintain 1300 rpm for this test, disconnect the throttle position sensor. Then use the throttle backup switch.
Gradually increase the engine rpm until the level of rpm is approximately 1300 rpm or until the machine begins to move.
Look at the upper drive shaft (between the torque converter updrive gears and the transmission). When the transmission clutch is operating correctly, a small amount of rotation will be observed in each position, except in NEUTRAL. The amount of rotation will be less than one complete turn.
Table 1
Engagement of Transmission Clutches
Transmission Speed Engaged Clutches in the Transmission
Reverse 2 3 and 7
Reverse 1 1 and 7
Neutral 1
First 2 and 6
Second 1 and 6
Third 3 and 6
Fourth 1 and 5
Fifth 3 and 5
Sixth 1 and 4
Seventh 3 and 4
Decrease the engine rpm to low idle. Shift to the next speed position. Repeat Steps 1, 2 and 3 of the shift sequence. This will help in the identification of a slipping clutch. Continue this sequence for the remainder of the speeds until the final speed is performed. Problem: The machine begins to move before engine rpm gets to 1300 rpm.
Probable Cause:
The problem is the braking system. Refer to Braking System Systems Operation, Testing and Adjusting for information on troubleshooting the braking system.Problem: The upper drive shaft does not turn in NEUTRAL.
Probable Cause:
The torque converter is damaged. Look for metal chips in the torque converter suction screen and the transmission magnetic screen. Refer to Testing and Adjusting, "Torque Converter and Transmission Hydraulic System Troubleshooting". Perform checks.
There is an improperly engaged transmission clutch. Refer to Testing and Adjusting, "Transmission Hydraulic Control Clutch Pressure - Test". This can cause damage to