Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A technician is performing a stall test on a torque converter on a forestry feller buncher. The engine RPM reaches the maximum allowed stall speed, but there is no output shaft rotation. What does this usually indicate?
If the engine reaches maximum stall speed but there's no output rotation, and the brakes are holding, it typically indicates that the stator is not holding stat
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Question: A technician is performing a stall test on a torque converter on a forestry feller buncher. The engine RPM reaches the maximum allowed stall speed, but there is no output shaft rotation. What does this usually indicate?
Answer options: ✅ A failed stator freewheel clutch in the torque converter
- A slipping park brake or service brake
- A seized engine or transmission component
- An incorrectly calibrated engine governor
Correct answer: A failed stator freewheel clutch in the torque converter
Explanation: If the engine reaches maximum stall speed but there's no output rotation, and the brakes are holding, it typically indicates that the stator is not holding stationary. A failed stator freewheel clutch would allow the stator to rotate freely, preventing proper torque multiplication and resulting in no output stall.
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