COVER AS 3688131 - Caterpillar

Illustration 3 g03602396
Stop valves for high-pressure oil delivery to the work tool (typical example)
Close the stop valves that are mounted on each side of the stick in order to prevent oil flow to the work tool during this procedure.
Disconnect the medium pressure lines for tool rotation and install the shipping plugs on the medium pressure lines. This action will prevent oil flow to the work tool for rotation during this procedure and allow for the valve to relief.
Release the pressure in the hydraulic system. Refer to Testing and Adjusting, "System Pressure - Release" for the machine.
Illustration 4 g03628457
Medium pressure control valve
(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 attachment control valve. Refer to Illustration 6 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 5 g03628900
Main relief valve for attachment 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 55° 5°C (131° 9°F).
Illustration 6 g02293176
Control Inputs for extension and retraction of the attachment valve for medium pressure
(LJ) Left-hand joystick
(RJ) Right-hand joystick
(C) Thumb wheel (Forward) - "Attachment Valve Extend"
(D) Thumb wheel (Backward) - "Attachment Valve Retract"
(FP) Electric foot pedal
(C) Pedal (Forward) - "Attachment Valve Extend"
(D) Pedal (Backward) - "Attachment Valve Retract"
Operate the control input to extend and retract the attachment 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
Attachment Control Valve Extend
Illustration 7 g03629029
Line relief valve for extension of attachment control valve
To adjust the line relief valve pressure setting, operate the control input for extension of the attachment control valve to the FULL position and hold. Refer to Illustration 6 for the control input.
Check the pressure reading at pressure tap (1).
Return the control input to the NEUTRAL position.
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