Technical note

Why does a hydraulic system overheat?

Illustration: technician working on a hydraulic power pack and valve block connections.
Illustrative image.

Overheating can come from low oil level, dirty or wrong-viscosity oil, a clogged filter, a relief valve constantly bypassing, internal leaks or insufficient cooling. Heat shortens the life of both oil and seals.

Considered together

  • Oil level and condition
  • Filter condition
  • Relief valve and internal leaks
  • Cooling and tank volume

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