EPC Parts Catalogs

953D, 963D and 973D Track-Type Loaders Hydraulic System Pressure Is High Caterpillar


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Hydraulic System Pressure Is High
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953D, 963D and 973D Track-Type Loaders [KENR6327]
953D, 963D and 973D Track-Type Loaders Hydrostatic Drive Is Sluggish
953D, 963D and 973D Track-Type Loaders Implement Droops Before Raising
HYDRAULIC SYSTEM
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953D, 963D and 973D Track-Type Loaders Brake Does Not Release
953D, 963D and 973D Track-Type Loaders Hydraulic System Has Unusual Noise
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953D, 963D and 973D Track-Type Loaders Hydraulic System Oil Temperature Is High
953D, 963D and 973D Track-Type Loaders Implement Cycle Time Is Fast
953D, 963D and 973D Track-Type Loaders Hydraulic System Pressure Is Low
1.1. Probable Causes
2.1. Recommended Actions
3.2. The Flow Compensator Spool Is Adjusted Incorrectly
4.2. The Pressure Compensator Valve Is Adjusted Incorrectly
5.2. The Flow Compensator Spool Does Not Move Freely
6.2. The Orifice Is Plugged
7.2. The Pump Is Not Fully Destroking

Probable Causes

  • The flow compensator spool is adjusted incorrectly.

  • The pressure compensator valve is adjusted incorrectly.

  • The flow compensator spool does not move freely.

  • The orifice is plugged.

  • The pump is not fully destroking.

Recommended Actions

The Flow Compensator Spool Is Adjusted Incorrectly

  1. Determine if the flow compensator spool in the compensator valve is adjusted correctly.

    1. Perform the Margin Pressure Test on the hydraulic pump.

      Reference: Refer to Testing and Adjusting, "Hydraulic Pump - Test and Adjust" for your machine.

The Pressure Compensator Valve Is Adjusted Incorrectly

  1. Make sure that the pressure compensator valve is adjusted correctly.

    1. Perform the High Pressure Stall Test on the implement pump.

      Reference: Refer to Testing and Adjusting, "Hydraulic Pump - Test and Adjust" for your machine.

The Flow Compensator Spool Does Not Move Freely

    Show/hide table
    Illustration 1g00850889
    (1) Flow compensator spool
    (2) Orifice

  1. Make sure that flow compensator spool (1) moves freely.

    1. Repair the compensator valve, if necessary.

The Orifice Is Plugged

  1. Make sure that orifice (2) is free of debris.

The Pump Is Not Fully Destroking

  1. Make sure that the pump is destroking. Ensure that the swashplate is not blocked and ensure that the actuator piston is not stuck.

    1. Repair the pump, if necessary.

Information System:

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