HARNESS AS-REAR CHASSIS 3392593 - Caterpillar

Illustration 5 g02788438
Pump compartment
(1) Pressure tap (delivery pressure for the auxiliary pump)
Attach a 34,450 kPa (5,000 psi) pressure sensor to pressure tap (1). Temporary Setting of the Main Relief Valve
A temporary setting of the main relief valve is required before any line relief valves can be adjusted.
Move the control input to the full position for extension and retraction of the control valve. Refer to Illustration 7 for the control inputs for tool rotation.
Check the main relief valve pressure setting at pressure tap (1).
Be sure that the main relief valve pressure is set at the pressure specification. Refer to Table 1. Note: Always make final pressure adjustments on pressure rise.
Illustration 6 g02788643
Main relief valve for the medium pressure control valve
Loosen the locknut. Turn the adjustment screw clockwise ONE HALF TURN or until the line relief settings can be seen. Tighten the locknut.
Reset main relief valve pressure setting to the normal operating condition after the completion of the line relief test and adjust. Refer to Testing and Adjusting, "Medium Pressure: Relief Valve (Main) - Test and Adjust" for the Tool Control System. Test Procedure
Start the engine.
Select a work tool for tool rotation. Refer to Testing and Adjusting, "Work Tool - Select" for the Tool Control System.
Place the machine controls at the following settings: engine speed dial "10" and AEC switch OFF. Refer to Testing and Adjusting, "Engine Performance - Test (Engine Speed)" for engine rpm settings.
Increase the hydraulic oil temperature to 50° 10°C (122° 18°F).
Illustration 7 g02293176
Control Inputs for extension and retraction of the valve for medium pressure
(LJ) Left-hand joystick
(RJ) Right-hand joystick
(C) Thumb wheel (Forward) - "Control Valve Extend"
(D) Thumb wheel (Backward) - "Control Valve Retract"
(FP) Electric foot pedal
(C) Pedal (Forward) - "Control Valve Extend"
(D) Pedal (Backward) - "Control Valve Retract"
Operate the control input to extend and retract the control valve. Note: A continuous relief of the valve for more than 10 seconds is not allowed.
Check the line relief valve pressure setting at pressure tap (1). Refer to Table 1 for the pressure specifications of the line relief valve.
Return the joystick to the NEUTRAL position. Adjustment Procedure
Control Valve Extend
Table 4
Line Relief Valve for Control Valve Extend
Engine speed Speed Dial "10"
AEC switch OFF
Relief pressure setting 22000 to 24000 kPa (3191 to 3481 psi)
Torque for locknut 27 1.5 N m (19.9 1.1 lb ft)
Illustration 8 g02788649
Line relief valve for extension of control valve
To adjust the line relief valve pressure setting, operate the control input for extension of the control valve to the FULL position and hold. Refer to Illustration 7 for the control input.
Check the pressure reading at pressure tap (1).
Return the control input to the NEUTRAL position.
The pressure readings should be within the specification. Refer to Table 4. If the pressure reading at the pressure taps is not within the specification, adjust the line relief valve.
In order to adjust the line relief valve, loosen the locknut on the line relief valve. Turn the adjustment screw until the pressure reading at the pressure taps is within the specification. Refer to