Heavy Duty Equipment Technician Red Seal Exam Prep · Question
During a routine inspection of a forestry feller buncher, the operator reports a 'sizzling' sound emanating from the hydraulic pump, especially when the machine is operating at high loads. This sound is accompanied by erratic control responses. What is the most probable cause?
A 'sizzling' or 'crackling' sound, along with erratic control, strongly indicates cavitation. This typically results from air entering the suction side or insuf
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Question: During a routine inspection of a forestry feller buncher, the operator reports a 'sizzling' sound emanating from the hydraulic pump, especially when the machine is operating at high loads. This sound is accompanied by erratic control responses. What is the most probable cause?
Answer options: ✅ Incipient cavitation due to air ingestion or an underfilled reservoir.
- A worn internal bearing in the hydraulic pump.
- An improperly adjusted main system relief valve.
- Excessive back pressure in the return line due to a clogged filter.
Correct answer: Incipient cavitation due to air ingestion or an underfilled reservoir.
Explanation: A 'sizzling' or 'crackling' sound, along with erratic control, strongly indicates cavitation. This typically results from air entering the suction side or insufficient fluid at the pump inlet (e.g., low reservoir level, clogged suction filter).
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