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Causes & Effects of Hydraulic Oil Contamination

The main cause of operating faults in hydraulic systems is heavily contaminated fluid.

  • Contamination enters the fluid by means of filler caps and seals. Internal 
  • Contamination results from parts moving within the hydraulic system.

The dirt particles which appear in a hydraulic fluid during operation are collectively called operational contamination.This dirt may leak in from outside onto the piston rod through weak seals, breathers or by insufficient wiping. It mayalso be caused by abrasion (abrasion of seals, metal filings) within the system or by aging of the hydraulic fluid (sludge formation).



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