Relief Valve (Swing) - Test and Adjust
- Stop the engine.
- Release the pressure in the hydraulic system. Refer to Testing And Adjusting, "Hydraulic System Pressure - Release".
- Connect a 60000 kPa (8700 psi) pressure gauge to pressure tap (2) .
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| Illustration 1 | g00666193 |
Pump compartment (1) Pressure tap (right pump delivery pressure) (2) Pressure tap (left pump delivery pressure) (3) Pressure tap (power shift pressure) | |
- Disconnect connector (28) from swing parking brake solenoid valve (29) .
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| Illustration 2 | g00878971 |
Pilot oil manifold (28) Connector (29) Swing parking brake solenoid valve | |
- Start the engine.
- Place the machine controls at the following settings: engine speed dial "10" and AEC switch OFF.
Reference: Refer to Testing And Adjusting, "Engine Performance - Test" for engine rpm settings.
- Move the swing joystick slowly and ensure that the swing parking brake is operating properly.
- Slowly move the swing joystick for a full SWING RIGHT operation and check the pressure for relief valve (25) at pressure tap (2) .
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| Illustration 3 | g00878976 |
Swing motor (22) Adjustment plug (23) Locknut (24) Relief valve (left swing) (25) Relief valve (right swing) (26) Adjustment plug (27) Locknut | |
- Return the swing joystick to the NEUTRAL position.
- The pressure setting of the swing relief valve is 20600 ± 980 kPa (3000 ± 140 psi). If the pressure reading at pressure tap (2) is not within the specification, adjust the swing relief valve.
- In order to adjust the swing relief valve, loosen locknut (23). Turn adjustment plug (22) until the pressure gauge reading at pressure tap (2) is 20600 ± 980 kPa (3000 ± 140 psi).
Note: Turning adjustment plug (22) clockwise increases the pressure. Turning adjustment plug (22) counterclockwise decreases the pressure.
Note: Always make final pressure adjustments on pressure rise.
- Tighten locknut (23) to a torque of 117 ± 10 N·m (85 ± 7 lb ft).
- Slowly move the swing joystick for a full SWING LEFT operation and check the pressure for relief valve (24) at pressure tap (2) .
- Return the swing joystick to the NEUTRAL position.
- The pressure setting of the swing relief valve is 20600 ± 980 kPa (3000 ± 140 psi). If the pressure reading at pressure tap (2) is not within the specification, adjust the swing relief valve.
- In order to adjust the swing relief valve, loosen locknut (27). Turn adjustment plug (26) until the pressure gauge reading at pressure tap (2) is 20600 ± 980 kPa (3000 ± 140 psi).
Note: Turning adjustment plug (26) clockwise increases the pressure. Turning adjustment plug (26) counterclockwise decreases the pressure.
Note: Always make final pressure adjustments on pressure rise.
- Tighten locknut (27) to a torque of 117 ± 10 N·m (85 ± 7 lb ft).
- After completing the test and/or the adjustment procedures for the swing relief valves, stop the engine.
- Release the pressure in the hydraulic system. Refer to Testing And Adjusting, "Hydraulic System Pressure - Release".
- Connect connector (28) to the solenoid valve for swing parking brake (29) .
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