TERMINAL AS 9X0196 - Caterpillar

Illustration 14 g02148872
Line relief valve for the grapple cylinder rod end
To adjust the line relief valve pressure setting of the grapple cylinder rod end, press the device of activation for the grapple until the grapple is at the full GRAPPLE OPEN position (full retraction of grapple cylinder). Hold the device of activation for the grapple in this position.
Check the pressure reading in the grapple cylinder rod end at pressure tap (1).
Return the device of activation for the grapple to the NEUTRAL position.
The pressure reading should be to the specification. Refer to Table 2. If the pressure reading at pressure tap (1) is not within the specification, adjust the line relief valve.
In order to adjust the line relief valve, loosen the locknut on the grapple line relief valve. Turn the adjustment screw until the pressure reading at pressure tap (1) is within the specification. Refer to Table 2. Note: Turn the adjustment screw clockwise in order to increase the pressure. Turn the adjustment screw counterclockwise in order to decrease the pressure.Note: Always make final pressure adjustment on pressure rise.
Tighten the locknut on the line relief valve. Grapple Rotate
Stop the engine.
Release the pressure in the hydraulic system. Refer to Testing and Adjusting, "System Pressure - Release".
Disconnect the hydraulic lines from the connectors on the rotator motor.
Install face seal plugs with o-ring seals in the open end of lines for the rotator motor.
Install caps with o-ring seals on the open connectors.
Illustration 15 g02410096
Medium pressure tap (located in pump compartment)
Connect a 34,450 kPa (5,000 psi) pressure sensor to the pressure tap for medium pressure.
Start the engine.
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).
Press the device for activation in order to rotate the grapple in a clockwise direction. Hold the switch in this position.
Check the pressure reading for the grapple rotate motor at the pressure tap.
Release the device for activation.
Illustration 16 g02149701
Rotator control valve in the swing motor compartment
(A) Main relief valve adjustment screw
Turn the adjustment screw until the pressure reading at the pressure tap is within specification. Note: Turning the adjustment screw clockwise increases the pressure. Turning the adjustment screw counterclockwise decreases the pressure.
Press the device for activation in order to rotate the grapple in a counterclockwise direction. Hold the switch in this position.
Check the pressure reading for the grapple rotate motor at the pressure tap.
Release the device for activation.
Turn the adjustment screw until the pressure reading at pressure tap is within specification. Note: Turning the adjustment screw clockwise increases the pressure. Turning the adjustment screw counterclockwise decreases the pressure.Note: Always make final pressure adjustment on pressure rise.Worksheet
Table 2
"Relief Valve (Line) - Test and Adjust"
Date Machine Serial Number
Machine Settings Main Relief Pressure(1)
35000 500 kPa (5075 73 psi)
Cylinder Cylinder Position Power Shift Pressure Engine Speed Relief Pressure Setting Actual
Boom Extended 2500 50 kPa (363 7 psi) Speed Dial