Relief Valve (Main) - Test and Adjust
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Required Tools     | ||
---|---|---|
Part Number     | Description     | Qty     |
8T-0861     | Pressure Gauge ( 60000 kPa (8700 psi))     |
1     |
- 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".
- Attach a 60000 kPa (8700 psi) pressure gauge to pressure tap (1) .
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Illustration 1 | g00816997 |
Pump compartment (1) Pressure tap (right pump delivery pressure) (2) Pressure tap (left pump delivery pressure) (3) Pressure tap (power shift 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 55° ± 5°C (131° ± 9°F).
- Open the bucket until the bucket cylinder rod is at the full retraction.
- Check the main relief valve pressure setting at pressure tap (1) .
- Return the joystick for the bucket to the NEUTRAL position.
- The main relief valve pressure setting should be 34300 ± 500 kPa (4975 ± 75 psi). If the main relief valve pressure setting is not within the specification, adjust the main relief valve pressure setting.
- In order to adjust the main relief valve, loosen locknut (5) and turn adjustment screw (4) until the pressure gauge reading at pressure tap (1) is 34300 ± 490 kPa (4950 ± 72 psi).
Note: Turn adjustment screw (4) clockwise in order to increase the pressure. Turn adjustment screw (4) counterclockwise in order to decrease the pressure.
Note: Always make final pressure adjustments on pressure rise.
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Illustration 2 | g00817008 |
(4) Adjustment screw (5) Locknut (6) Main relief valve |
- Tighten locknut (5) to a torque of 50 ± 10 N·m (37 ± 7 lb ft).
Temporary Setting of the Main Relief Valve
Note: A temporary setting of the main relief valve is required before any line relief valve can be adjusted.
- The main relief valve pressure setting should be 34300 ± 500 kPa (4975 ± 75 psi). If the main relief valve is not within the specification, adjust the main relief valve pressure setting to the correct pressure specification before performing Step 2. Refer to Testing and Adjusting, "Relief Valve (Main) - Test and Adjust".
- Loosen locknut (5) and turn adjustment screw (4) clockwise for one half turn. Tighten locknut (5) to the specified torque.
Note: Always make final pressure adjustments on pressure rise.
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Illustration 3 | g00817008 |
(4) Adjustment screw (5) Locknut (6) Main relief valve |
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