System G14: Relief Valve (Line) - Test and Adjust - Auxiliary Control Valve (Medium Pressure)
Complete the following steps in order:
- Position the machine on level ground and stop the engine.
- Release the pressure in the hydraulic system. Refer to Testing And Adjusting, "Hydraulic System Pressure - Release".
- Connect a 40000 kPa (5800 psi) pressure gauge to pressure tap (2) .
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| Illustration 1 | g00983987 |
(1) Auxiliary pump (2) Pressure tap | |
- 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 55° ± 5°C (131° ± 9°F).
- Set the pilot pressure to the specifications in Testing and Adjusting (Engine and Pump Control), "Relief Valve (Pilot) Test and Adjust".
- Loosen locknut (6). Turn the adjustment screw (3) for the main relief valve for the Auxiliary Control Valve (Medium Pressure) clockwise for one half turn. This will ensure that the main relief valve for the Auxiliary Control Valve (Medium Pressure) is set above the line relief valve for the Auxiliary Control Valve (Medium Pressure).
- Move the left joystick slide control Forward or Backward. Check the auxiliary pump discharge pressure on the pressure gauge.
- Return the left joystick slide control to NEUTRAL position.
- The pressure setting for the line relief valves must be within the specifications for the Auxiliary Control Valve (Medium Pressure). If the pressure setting of line relief valves are not within the specifications, loosen the locknut (4) and adjust the line relief valves to a pressure setting of 22100 kPa (3205 psi) to 23100 kPa (3350 psi).
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 adjustments on pressure rise.
- Return the main relief valve for the Auxiliary Control Valve (Medium Pressure) to the specified pressure setting. Tighten locknut (6) to a torque of 50 ± 10 N·m (37 ± 7 lb ft).
- Tighten locknut (4) to a torque of 50 ± 10 N·m (37 ± 7 lb ft).
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| Illustration 2 | g00832133 |
(3) Main relief valve adjustment screw (4) Locknut (5) Relief valve adjustment screw | |
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