HydraulicsHard

Hydraulic Pump Repair

Diagnose, remove, and repair or replace a failing hydraulic pump.

Estimated: 4-8 hours
1 model-specific guide
Model-Specific Guides

AGT H12

4 steps • 0 components

May apply to any excavator

General Guide

Hydraulic Pump Repair

The hydraulic pump is the heart of the system. Worn pumps cause weak functions, slow operation, and overheating. Repair requires clean conditions and proper technique.

Tools Required:

Socket setSeal kitClean work areaPump rebuild kit or replacement pump

Safety Notes

  • • Work in clean environment
  • • Contamination destroys new parts
  • • Prime pump before starting

General Steps:

1

Confirm pump failure with pressure testing and flow measurement.

2

Drain hydraulic reservoir to below pump level.

3

Disconnect all hydraulic lines from pump - cap immediately.

4

Remove pump mounting bolts and coupling to engine.

5

Remove pump and inspect drive coupling for damage.

6

Disassemble pump in clean environment.

7

Inspect gears, bearings, and seals for wear.

Gear pumps: check gear faces and housing. Piston pumps: check pistons and swashplate.
8

Replace worn components with quality parts or install rebuilt pump.

9

Reinstall pump with new seals and gaskets.

10

Prime pump, refill system, and test operation.

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