CORD AS 3523953 - 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.
Table 1
Tools Needed     Qty    
3J-1907 O-Ring Seal     1    
6V-8398 O-Ring Seal     1    
6V-3965 Nipple Assembly     1    
7X-0871 Tee     1    
8T-0855 Pressure Gauge (
4000 kPa (580 psi))     1    This test will determine if the signal oil pressure is being sent to the relay valve in the lockup clutch and synchronizing valve.Note: Make sure that the filters and the screens are clean before you test any pressures. Make sure that the oil is at operating temperature before you perform this test.Procedure
Illustration 1 g00681909
(1) Upshift solenoid (2) Downshift solenoid (3) Lockup clutch solenoid
Disconnect the electrical harness connection from lockup solenoid (3). Disconnect the electrical harness from upshift solenoid (1) and downshift solenoid (2) .
The transmission shift lever must be in NEUTRAL and the transmission rotary selector spool must be in the NEUTRAL-1 position.
The harness for downshift solenoid (2) remains activated when the transmission is in NEUTRAL. The harness for downshift solenoid (2) will be used to supply power to lockup clutch solenoid (3). The harness will supply +24 Volts to lockup clutch solenoid (3) .
Illustration 2 g00683929
(4) Hose from the lockup clutch solenoid
Disconnect hose (4). Install a 7X-0871 Tee and a 6V-8398 O-Ring Seal. Reconnect hose (4) to one side of the 7X-0871 Tee .
Install a 6V-3965 Nipple Assembly and a 3J-1907 O-Ring Seal to the other side of the 7X-0871 Tee. Connect a 8T-0855 Pressure Gauge (4000 kPa (580 psi)) to the nipple assembly.
Start the engine while the parking brake is activated. Run the engine at the low idle rpm with the transmission in NEUTRAL. The pressure on the gauge must be 0 kPa (0 psi).
Connect the electrical harness for the downshift solenoid to the lockup solenoid.Note: In order to maintain 1300 rpm for this test, disconnect the throttle position switch. Then use the throttle backup switch.
Run the engine at the medium idle rpm. The medium idle rpm is approximately 1300 rpm. The pressure on the gauge should be above 2050 kPa (300 psi).
Run the engine at the low idle rpm. Disconnect the electrical harness connector from the lockup clutch solenoid. The pressure on the gauge must be 0 kPa (0 psi).
Stop the engine. After the pressure is correctly set, remove the test equipment.Problem: The oil pressure is not 0 kPa (0 psi) when the lockup clutch solenoid is deactivated.
Probable Cause
The lockup solenoid is not operating correctly. The lockup solenoid is not closing.Problem: The oil pressure is 0 kPa (0 psi) or the oil pressure is low when the lockup clutch solenoid is activated.
Probable Cause
The transmission charging section of the transmission pump is failing. Perform the test in Testing and Adjusting, "Transmission Hydraulic