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Heavy Duty Equipment Technician Red Seal Exam Prep · Question

A field technician determines that a loader's hydraulic pump is cavitating. What corrective action involving the reservoir is most likely to reduce or eliminate the cavitation issue?

A clean and unrestricted breather allows atmospheric pressure to properly act on the oil surface, ensuring adequate pressure at the pump inlet. A restricted bre

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Question: A field technician determines that a loader's hydraulic pump is cavitating. What corrective action involving the reservoir is most likely to reduce or eliminate the cavitation issue?

Answer options:

  • Increasing the reservoir's capacity
  • Lowering the oil level in the reservoir ✅ Ensuring the reservoir breather is clean and unrestricted
  • Installing a smaller suction line filter

Correct answer: Ensuring the reservoir breather is clean and unrestricted

Explanation: A clean and unrestricted breather allows atmospheric pressure to properly act on the oil surface, ensuring adequate pressure at the pump inlet. A restricted breather can lead to a vacuum in the reservoir, exacerbating or causing cavitation by reducing the net positive suction head (NPSH) available to the pump.

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