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Fluid Power Information Center

Troubleshooting Hints for Hydraulic Systems (Power Units)

Noisy Pump
(troubleshooting a hydraulic noise problem chart)
(EATON pdf Noise Control in Hydraulic Systems)
  1. Intake blocked
  2. Air leaks in suction or shaft seal. Air drawn in through inlet due to low oil level.
  3. Entrained air.
  4. Fluid viscosity too high.
  5. Pump running too fast.
  6. Suction filter too small.
  7. Loose parts in pump.
  8. Worn or damaged parts.
  9. Foreign matter drawn into pump.
NO PRESSURE OR LACK OF PRESSURE (more on troubleshooting a hydraulic system pressure problem)
  1. Relief valve not working properly.
  2. Broken line
PUMP DOES NOT DELIVER FLUID (more on troubleshooting a hydraulic fluid flow problem)
  1. Low fluid level in reservoir.
  2. Suction line blocked.
  3. Pump not priming
  4. Pump not being driven properly, or in wrong direction.
  1. Air entrainment
  2. Dirt passing through relief valve.
EXCESSIVE HEATING OF FLUID (more on troubleshooting an excessive heat in hydraulic fluid problem)
  1. Relief valve set to high.
  2. Unloading valve improperly set.
  3. System may require heat exchanger.
  4. Restricted lines.
Other hydraulic power system troubleshooting links:
ESOP (Employee Stock Ownership Program) Fluid Power Distributors Association The International Fluid Power Society Association for High Technology Distribution National Fluid Power Association National Association of Safety Professionals