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Heavy Duty Equipment Technician Red Seal Exam Prep · Question

What is the primary consequence of using hydraulic fluid with a viscosity that is too low?

Low viscosity fluid provides a thinner lubricating film, leading to increased metal-to-metal contact and wear, as well as higher internal leakage (slippage) acr

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Question: What is the primary consequence of using hydraulic fluid with a viscosity that is too low?

Answer options:

  • Reduced system operating temperature
  • Increased pump efficiency ✅ Increased internal leakage and wear
  • Improved cavitation resistance

Correct answer: Increased internal leakage and wear

Explanation: Low viscosity fluid provides a thinner lubricating film, leading to increased metal-to-metal contact and wear, as well as higher internal leakage (slippage) across component clearances, reducing efficiency.

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