CONTROL AR-COUPLER 3845013 - Caterpillar

Personal injury or death can result from sudden machine movement.Sudden movement of the machine or release of air pressure or oil pressure can cause injury to persons on or near the machine.To help prevent possible injury before testing and adjusting any air system or hydraulic system, perform the procedure in the Testing and Adjusting, "General Information" section.
This check determines if the following 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 solenoid. Start the engine and run the engine at low idle.
Engage the parking brakes and the service brakes.
Perform the shift sequence that follows for reverse and for each forward speed. Note: Regularly check the torque converter oil temperature. Do not allow the torque converter oil temperature to increase too much during this shift sequence. The torque converter and the transmission can be damaged by high oil temperature. Watch for any temperature warnings. If the oil temperature becomes too hot, put the transmission in NEUTRAL. The engine should then 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