ELBOW 3665354 - Caterpillar

Illustration 1 g01082637
Pressure reduction valve (1) Shims (2) Pressure reduction valve
Illustration 2 g01177220
Torque converter lockup clutch and solenoid valve (3) Pressure tap for the lockup clutch pilot oil "RV"
Remove the plug at pressure tap (3). Install a test nipple at the location of the removed plug.
Use a coupler and a hose to connect a 8T-0855 Pressure Gauge to the nipple.
With the parking brake engaged, start and run the engine at low idle rpm with the transmission in NEUTRAL. The pressure on the gauge should be 1725 70 kPa (250 10 psi).
Stop the engine. After the pressure is correctly set, remove the test equipment.
Table 2
Chart of Shims for the Pressure Reduction Valve (1)    
Part No. for the Shims     Thickness of the Shims     Change in Pilot Pressure as a Result of One Shim    
5J-2721 Shim    
0.13 mm (0.005 inch)    
10 kPa (1.4 psi)    
6J-3993 Shim    
0.25 mm (0.010 inch)    
19 kPa (2.8 psi)    
5J-1036 Shim    
0.80 mm (0.031 inch)    
60 kPa (8.7 psi)    
( 1 ) Before an adjustment is made, be certain that the valve spring is not weak or broken.Problem: The oil pressure is too low.
Probable Cause:
Pressure reduction valve (2) is sticking.
Pressure reduction valve (2) is incorrectly set. Add shims (1). Refer to Table 2. Problem: The oil pressure is too high.
Probable Cause:
Pressure reduction valve (2) is sticking.
Pressure reduction valve (2) is incorrectly set. Remove shims (1). Refer to Table 2.Procedure 2
Note: Perform "Procedure 1" before proceeding with this procedure. Both of the procedures may be performed at the same time.
Disconnect the electrical harness for 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. This causes +24 volts to be supplied to the electrical harness for the downshift solenoid.
Use two Deutsch 2-pin connectors (one plug and one receptacle) 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.
Illustration 3 g01177221
Torque converter lockup clutch and solenoid valve (4) Plug
Remove plug (4) from the torque converter lockup clutch and solenoid valve.Note: Be careful to not allow dirt to enter the passage after plug (4) is removed. Dirt will prevent proper operation of the shuttle valve.
Install a 5P-1318 Adapter into the passage. Install a 6V-3965 Fitting As into the 5P-1318 Adapter. Use a hose and a coupler to connect a 8T-0855 Pressure Gauge to the fitting assembly.
With the parking brake engaged, start and run the engine at low idle rpm with the transmission in NEUTRAL. The pressure on the gauge must be 0 kPa (0 psi).Note: In order to maintain 1300 rpm for this test, disconnect the throttle position sensor. Then use the throttle backup switch.
Look at the pressure gauge and