Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A powershift transmission in a heavy-duty grader exhibits delayed engagement and slipping in multiple gears, particularly when the hydraulic system is at operating temperature. What is the most likely hydraulic system component fault responsible for these symptoms?
Delayed engagement and slipping in multiple gears, especially when warm, strongly suggest internal leakage within the clutch packs or control valves due to wear
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Question: A powershift transmission in a heavy-duty grader exhibits delayed engagement and slipping in multiple gears, particularly when the hydraulic system is at operating temperature. What is the most likely hydraulic system component fault responsible for these symptoms?
Answer options:
- Clogged main relief valve
- Worn pump drive coupling ✅ Internal leakage within clutch packs or control valves
- Broken transmission output shaft
Correct answer: Internal leakage within clutch packs or control valves
Explanation: Delayed engagement and slipping in multiple gears, especially when warm, strongly suggest internal leakage within the clutch packs or control valves due to wear, allowing hydraulic pressure to bypass and reduce clamping force.
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