Heavy Duty Equipment Technician Red Seal Exam Prep · Question
During a routine inspection of a hydraulic system, a technician notices significant pitting and erosion on the inner surfaces of a gear pump's housing and gear teeth. The machine has been known to operate with very thick oil during cold starts. What is the most likely long-term cause of this specific damage?
Pitting and erosion, especially on pump components and particularly linked to cold, viscous oil operation, are highly indicative of repeated cavitation. Restric
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Question: During a routine inspection of a hydraulic system, a technician notices significant pitting and erosion on the inner surfaces of a gear pump's housing and gear teeth. The machine has been known to operate with very thick oil during cold starts. What is the most likely long-term cause of this specific damage?
Answer options:
- High-pressure spikes from relief valve chatter
- Abrasive wear from contaminated hydraulic fluid
- Corrosion due to water in the hydraulic oil ✅ Repeated cavitation due to restricted suction line flow
Correct answer: Repeated cavitation due to restricted suction line flow
Explanation: Pitting and erosion, especially on pump components and particularly linked to cold, viscous oil operation, are highly indicative of repeated cavitation. Restricted suction and cold, thick oil make the pump work harder to draw fluid, lowering inlet pressure and inducing cavitation.
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