Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A dump truck with a 13-speed manual transmission frequently pops out of 8th gear under load. The operator reports that it doesn't happen in any other gear. What is the most probable cause?
A bent or worn shift fork for 8th gear would not hold the gear fully engaged, allowing it to pop out under load. Worn synchronizer components usually cause gear
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Question: A dump truck with a 13-speed manual transmission frequently pops out of 8th gear under load. The operator reports that it doesn't happen in any other gear. What is the most probable cause?
Answer options:
- Worn synchronizer cone for 8th gear
- Excessive end play in the main shaft ✅ Bent or worn shift fork for 8th gear
- Low transmission fluid level
Correct answer: Bent or worn shift fork for 8th gear
Explanation: A bent or worn shift fork for 8th gear would not hold the gear fully engaged, allowing it to pop out under load. Worn synchronizer components usually cause gear clash during engagement, not popping out of gear. Excessive main shaft end play or a low fluid level would likely affect multiple gears or lead to general transmission noise/overheating, respectively.
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