Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A hydraulic system's reservoir is emitting a 'foamy' appearance, and the fluid level is decreasing faster than expected, despite no external leaks. The machine is experiencing erratic operation. What is the most likely cause of these combined symptoms?
Air ingress into the suction side of the pump (aeration) causes foamy oil, can lead to noisy and erratic operation, and displaces the oil, making it appear cons
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Question: A hydraulic system's reservoir is emitting a 'foamy' appearance, and the fluid level is decreasing faster than expected, despite no external leaks. The machine is experiencing erratic operation. What is the most likely cause of these combined symptoms?
Answer options:
- The hydraulic oil is severely degraded and oxidized
- The reservoir is undersized for the system's flow rate ✅ Air is being continuously drawn into the suction side of the pump
- The main relief valve is constantly bypassing fluid
Correct answer: Air is being continuously drawn into the suction side of the pump
Explanation: Air ingress into the suction side of the pump (aeration) causes foamy oil, can lead to noisy and erratic operation, and displaces the oil, making it appear consumed without external leaks. This is a common and critical issue that requires immediate attention.
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