SUPPORT ASSEM. (R.H.) 7N5558 - Caterpillar

Illustration 2 g01055271
(1) Pressure tap for lockup clutch pilot oil "RV"This procedure will show if the pressure reduction valve is correctly set. The pressure reduction valve controls the pilot pressure for the lockup clutch and solenoid valve.
At pressure tap (1), remove the plug. Install 6V-3965 Nipple Assembly .
Use a coupler and a hose to connect 8T-0855 Pressure Gauge (0 to 4,000-kPa (0 to 580-psi)) to the nipple assembly at port (1) .
Start the engine while the parking brakes are engaged. Run the engine at low idle with the transmission in the NEUTRAL position. The pressure on the gauge must be 1725 70 kPa (250 10 psi).
Stop the engine. After the pressure is correctly set, remove the test equipment. Reinstall the plug at pressure tap (1). Replace the 3J-1907 O-Ring Seal .
Illustration 3 g01055272
Pressure reduction valve (2) Shims (3) Pressure reduction valve
Table 2
Chart of Shims for the Pressure Reduction Valve (1)    
Part No. for Shim     Thickness     Change in Pressure    
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 performed, be certain that the valve spring is not weak or broken.Use Illustration 3 and Table 2 for the following problems.Problem: The oil pressure is too low.
Probable Cause
The spool in pressure reduction valve (3) is sticking.
The pressure reduction valve is incorrectly set. Add shims (2). Refer to Table 2.Problem: The oil pressure is too high.
Probable Cause
The spool in pressure reduction valve (3) is sticking.
The pressure reduction valve is incorrectly set. Remove shims (2). Refer to Table 2.Procedure 2
Note: Preform "Procedure 1" before proceeding with this procedure.This procedure will show if the solenoid valve is operating properly.
Disconnect the electrical harness connection from the lockup clutch solenoid, the upshift solenoid, and the downshift solenoid.
The transmission control must be in the NEUTRAL position.
The downshift solenoid remains activated when the transmission is in neutral. The harness for the downshift solenoid will be used to supply power to the lockup clutch 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 4 g01055274
(4) Plug (located on back face)
Remove plug (4) from the 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 5P-1318 Adapter into the passage. Install 6V-3965 Nipple Assembly into 5P-1318 Adapter. Connect 8T-0855 Pressure Gauge (0 to 4,000-kPa (0 to 580-psi)) to the nipple assembly.
Start the engine with the parking brake is engaged. Run the engine at low idle with the transmission in the NEUTRAL position. The pressure on the gauge must be 0 kPa