1. Home
  2. Caterpillar
  3. Testing and Adjusting
  4. #i02287604

330C Excavator Hydraulic System Caterpillar


Relief Valve (Swing) - Test and Adjust

Usage:

330C MSD

  • Position 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".
      Show/hide table

      Illustration 1g00816997

      Pump compartment

      (1) Pressure tap (right pump delivery pressure)

      (2) Pressure tap (left pump delivery pressure)

      (3) Pressure tap (power shift pressure)

    1. Connect a 60000 kPa (8700 psi) pressure gauge to pressure tap (2) .
      Show/hide table

      Illustration 2g00817090

      Pilot oil manifold

      (26) Connector

      (27) Swing parking brake (solenoid valve)

    1. Disconnect connector (26) from the swing parking brake (solenoid valve) (27) .

    1. Start the engine.

    1. 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 (Engine Speed)" for engine rpm settings.

    1. Move the swing joystick slowly and ensure that the swing parking brake is operating properly.
      Show/hide table

      Illustration 3g00817093

      Swing motor

      (22) Adjustment plug

      (23) Locknut

      (25) Relief valve (left swing)

      (34) Adjustment plug

      (35) Locknut

      (36) Relief valve (right swing)

    1. Slowly move the swing joystick for a full SWING RIGHT operation and check the pressure for relief valve (25) at pressure tap (2) .

    1. Return the swing joystick to the NEUTRAL position.

    1. The pressure setting of the swing relief valve is 29400 ± 980 kPa (4250 ± 140 psi). If the pressure reading at pressure tap (2) is not within the specification, adjust the swing relief valve.

    1. 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 29400 ± 980 kPa (4250 ± 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.

    1. Tighten locknut (23) to a torque of 117 ± 10 N·m (85 ± 7 lb ft).

    1. Slowly move the swing joystick for a full SWING LEFT operation and check the pressure for relief valve (36) at pressure tap (2) .

    1. Return the swing joystick to the NEUTRAL position.

    1. The pressure setting of the swing relief valve is 29400 ± 980 kPa (4250 ± 140 psi). If the pressure reading at pressure tap (2) is not within the specification, adjust the swing relief valve.

    1. In order to adjust the swing relief valve, loosen locknut (35). Turn adjustment plug (34) until the pressure gauge reading at pressure tap (2) is 29400 ± 980 kPa (4250 ± 140 psi).

      Note: Turning adjustment plug (34) clockwise increases the pressure. Turning adjustment plug (34) counterclockwise decreases the pressure.

      Note: Always make final pressure adjustments on pressure rise.

    1. Tighten locknut (35) to a torque of 117 ± 10 N·m (85 ± 7 lb ft).

    1. After completing the test and/or the adjustment procedures for the swing relief valves, stop the engine.

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

    1. Connect connector (26) to the solenoid valve for swing parking brake (27) .

    • Caterpillar Information System:

    330C Excavator Hydraulic System Swing Motor - Test - Measurement of Case Drain Oil
    330C Excavator Hydraulic System Relief Valve (Main) - Test and Adjust
    330C Excavator Hydraulic System Accumulator (Pilot) - Test and Charge
    330C Excavator Hydraulic System Relief Valve (Pilot) - Test and Adjust
    330C Excavator Hydraulic System Swing Speed and Swing Drift on a Slope - Check
    330C Excavator Hydraulic System Swing Speed and Overswing on Level Ground - Check
    330C Excavator Hydraulic System Machine Drift on a Slope - Check
    345C Material Handler Hydraulic System Return Hydraulic System
    330C Excavator Hydraulic System Travel on Level Ground - Test
    365C Front Shovel Hydraulic System Cylinder Drift - Check - Loaded Bucket
    330C Excavator Hydraulic System Travel on Level Ground - Test - Optional Test
    345B Series II Excavator Additional Messages
    302.5C Mini Hydraulic Excavator Machine System Specifications Stick Cylinder
    345C Excavator Tool Control System System 14: Solenoid Valve (Proportional Reducing) - Calibrate - Attachment Control Valve
    345C Excavator Tool Control System System 14: Relief Valve (Line) - Test and Adjust - Attachment Control Valve
    345C Excavator Tool Control System System 14: Relief Valve (Main) - Test and Adjust - Auxiliary Control Valve (Medium Pressure)
    330C With Drilling Front Machine System Specifications Cooling Lines
    365C Front Shovel Hydraulic System Relief Valve (Line) - Test and Adjust
    365C Front Shovel Hydraulic System Specifications
    325D and 329D Excavators Fuses - Replace
    330C Excavator Hydraulic System Swing Bearing Movement - Measure
    330C Excavator Hydraulic System Travel Motor - Test - Measurement of Case Drain Oil
    330C Excavator Hydraulic System Relief Valve (Crossover) - Test and Adjust
    302.5C Mini Hydraulic Excavator Machine System Specifications Bucket Cylinder
    Back to top
    Contacts My AVS
    The names Caterpillar, John Deere, JD, JCB, Hyundai or any other original equipment manufacturers are registered trademarks of the respective original equipment manufacturers. All names, descriptions, numbers and symbols are used for reference purposes only.
    CH-Part.com is in no way associated with any of the manufacturers we have listed. All manufacturer's names and descriptions are for reference only.