Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A hydraulic system is experiencing intermittent erratic operation and a 'pinging' sound from the pump, particularly when the oil is cold. Upon inspection, the technician notes that the hydraulic oil filter is partially plugged. Which of the following conditions is the most likely cause of these symptoms?
A partially plugged filter restricts oil flow to the pump inlet. This restriction, especially with cold, viscous oil, can create a low-pressure area at the pump
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Question: A hydraulic system is experiencing intermittent erratic operation and a 'pinging' sound from the pump, particularly when the oil is cold. Upon inspection, the technician notes that the hydraulic oil filter is partially plugged. Which of the following conditions is the most likely cause of these symptoms?
Answer options:
- Pressure intensification within the pump
- Aeration of the hydraulic oil ✅ Cavitation of the hydraulic pump
- Turbulence in the return line
Correct answer: Cavitation of the hydraulic pump
Explanation: A partially plugged filter restricts oil flow to the pump inlet. This restriction, especially with cold, viscous oil, can create a low-pressure area at the pump inlet, leading to the formation and collapse of vapour bubbles, which is cavitation, characterized by noise and erratic operation.
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