SHAFT 8K1749 - 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.
Note: Transmissions FRT1-1198 have modulating reducing style lock up clutch valves. Transmissions ; FRT1199-Up have electronic clutch pressure control "ECPC" style valves. Modulating reducing style and ECPC style lock up clutch valves require software with different application codes. Refer to Special Instruction, REHS4541, "Software Configuration Guide{3168, 4800, 4808, 7600, 7610, 7620}".This check determines if the following conditions exist:
The electrical signal arrives at the solenoid valves.
The solenoid valves are electrically activating.Procedure
Disconnect the electrical harness from the lockup clutch solenoid. Disconnect the upshift solenoid and the downshift solenoid.
The transmission control must be in NEUTRAL and the transmission rotary selector spool must be in NEUTRAL.
The downshift solenoid remains activated while the transmission is in NEUTRAL causing +24V to be supplied to the electrical harness for the downshift solenoid.
Use two Sure-Seal 2-pin connectors and two 16 gauge wires in order to make a jumper harness. The two wires should be approximately 4.5 m (15 ft) long. Connect one end of the jumper harness to the harness for the downshift solenoid.
Turn on the engine start switch. Do not start the engine.
Connect the jumper harness from the downshift solenoid to the lockup clutch solenoid.
Remove the jumper harness from the electrical harness.
Connect the electrical harness from the downshift solenoid to the upshift solenoid.
Connect the electrical harness from the downshift solenoid to the downshift solenoid.
A click or a buzz must be felt or a click or a buzz must be heard whenever the electrical harness contacts the solenoid. Problem: The click or the buzz is not felt or heard.
Probable Cause
A bad solenoid
Broken wire or harness to the solenoid