Why Your Hydraulic Pump Is Making Noise: Cavitation, Aeration, and What to Do

Unusual noise from a hydraulic pump is never normal. It often points to cavitation, aeration, or internal damage — and it’s always a sign to stop and inspect before the system fails completely.

Common Hydraulic Pump Noises and What They Mean

  • High-pitched whining: Usually indicates cavitation — vapor bubbles collapsing inside the pump.
  • Rattling or knocking: Often caused by aeration, where air has entered the fluid.
  • Grinding or growling: Mechanical wear from contaminated fluid or component failure.

What Causes These Problems?

  • Low fluid levels drawing in air
  • Clogged suction strainers or filters
  • Leaking suction lines or loose fittings
  • Incorrect pump speed or misalignment
  • Foamed or water-contaminated hydraulic fluid

Immediate Fixes and Long-Term Solutions

  • Top off fluid and bleed the system to remove air
  • Replace clogged filters or suction screens
  • Check and reseal all fittings on suction side
  • Drain and flush fluid if contaminated or foamed
  • Inspect and rebuild or replace pump if wear is advanced

Conclusion

Don’t ignore noisy pumps. Hydraulic noise is often the only early warning before serious damage sets in. Whether it’s cavitation, aeration, or mechanical wear, prompt inspection and repair will save your equipment from major failure — and save you from major costs.

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