Heavy Duty Equipment Technician Red Seal Exam Prep · Question
During a pressure testing sequence, a technician discovers significant pressure fluctuations when an actuator is engaged, even though the prime mover RPM is constant. The system has an accumulator. What could be a highly probable cause?
If an accumulator's pre-charge is too low, or if its bladder has failed, it cannot effectively store and release fluid or damp pressure fluctuations, leading to
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Question: During a pressure testing sequence, a technician discovers significant pressure fluctuations when an actuator is engaged, even though the prime mover RPM is constant. The system has an accumulator. What could be a highly probable cause?
Answer options:
- A restricted pump inlet filter.
- The accumulator is overcharged with nitrogen.
- A partially failed main relief valve. ✅ The accumulator's pre-charge pressure is incorrect or the bladder has failed.
Correct answer: The accumulator's pre-charge pressure is incorrect or the bladder has failed.
Explanation: If an accumulator's pre-charge is too low, or if its bladder has failed, it cannot effectively store and release fluid or damp pressure fluctuations, leading to erratic pressure behaviour in the system during operation.
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