How do I test whether an excavator hydraulic pump is weak: pressure gauge or flow meter?
Short Answer
A pressure gauge can show whether relief pressure is reached, but it does not prove the pump still delivers enough flow under load. To judge a weak excavator pump, test pressure and flow at operating temperature with the correct flow meter and load valve. Hot-oil weakness often shows up as flow loss under pressure.
What To Check
- Use a pressure gauge first to confirm relief pressure and obvious control problems.
- Use a rated flow meter with a load valve to confirm pump output under pressure.
- Test after the oil is warm because pump wear may be hidden when the oil is cold.
Related JIAJUE Parts
Send the machine model, serial number, old part label and clear photos before ordering so JIAJUE PARTS can help reduce wrong fitment.
Source Record
This question was selected from a Google-visible industry discussion result for the keyword Liebherr excavator hydraulic pump pressure flow meter. The answer is rewritten from JIAJUE parts-matching and sourcing practice, not copied from the source page.
