305 CR Mini Hydraulic Excavator Hydraulic System Relief Valve (Pilot) - Test and Adjust Caterpillar


Relief Valve (Pilot) - Test and Adjust
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305 CR Mini Hydraulic Excavator Hydraulic System [RENR5556]
HYDRAULIC SYSTEM
VALVE GP-PILOT RELIEF
305 CR Mini Hydraulic Excavator Hydraulic System Relief Valve (Pilot) - Test and Adjust

  1. Place the machine on level ground.

  1. Stop the engine.

  1. Release the pressure in the hydraulic system. Refer to Testing and Adjusting, "Hydraulic System Pressure - Release".



    Illustration 1g00836471

  1. Remove cover (1) from the machine in order to access the pressure tap for the pilot relief valve.



    Illustration 2g00816660

    Front view of cab

    (2) Pilot pressure tap

  1. Connect a 6000 kPa (870 psi) pressure gauge to pressure tap (2) .

  1. Start the engine.

  1. Place the engine speed dial at the HIGH IDLE position. Refer to Testing and Adjusting, "Engine Performance - Test (Engine Speed)" for engine rpm settings.

  1. Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).

  1. Check the pilot relief valve setting at pressure tap (2) .

  1. The pilot relief valve setting should be 3400 ± 200 kPa (495 ± 30 psi). If the pilot relief valve setting is not within the specification, adjust the pilot relief valve.



    Illustration 3g00836472

    View under the operator platform

    (3) Pilot relief valve




    Illustration 4g00836517

    Pilot manifold

    (3) Pilot relief valve

    (4) Shims

  1. Adjust the number of shims in order to adjust the pilot relief valve. Adding shims increases the pressure. Removing shims decreases the pressure.

Note: Normal operation of the engine and pumps are necessary for the pressure adjustment. If the results of the pressure adjustments are not correct, then the engine and the pump characteristic curve needs to be checked.

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