Heavy Duty Equipment Technician Red Seal Exam Prep · Question
During a pre-shift inspection, an operator notices a high-pitched 'screaming' sound from the hydraulic pump on a skid steer, which quickly subsides once the machine warms up but returns under heavy load. The fluid level is correct. What is the most probable cause?
A high-pitched 'screaming' often indicates aeration, where air bubbles are present in the hydraulic fluid. This can be caused by a leaky suction line connection
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Question: During a pre-shift inspection, an operator notices a high-pitched 'screaming' sound from the hydraulic pump on a skid steer, which quickly subsides once the machine warms up but returns under heavy load. The fluid level is correct. What is the most probable cause?
Answer options: ✅ Aeration entrained in the hydraulic fluid.
- A worn main system pressure relief valve spring.
- An improperly adjusted pilot pressure reducing valve.
- A seized pump drive shaft coupling.
Correct answer: Aeration entrained in the hydraulic fluid.
Explanation: A high-pitched 'screaming' often indicates aeration, where air bubbles are present in the hydraulic fluid. This can be caused by a leaky suction line connection, a faulty pump shaft seal, or turbulence in the reservoir, leading to noisy pump operation particularly under stress or when the fluid is cold and thick.
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