Heavy Duty Equipment Technician Red Seal Exam Prep · Question
An off-highway truck's torque converter experiences a sudden loss of coupling, where the engine RPM revs freely but the truck barely moves. The operator reports no unusual noises. What is the most probable mechanical failure?
If the engine revs freely but there's minimal drive, and no metallic grinding, it suggests a mechanical disconnection in the power path. A sheared turbine shaft
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Question: An off-highway truck's torque converter experiences a sudden loss of coupling, where the engine RPM revs freely but the truck barely moves. The operator reports no unusual noises. What is the most probable mechanical failure?
Answer options:
- Stator clutch seizure. ✅ Turbine shaft shear.
- Impeller fin damage.
- Overheating transmission fluid.
Correct answer: Turbine shaft shear.
Explanation: If the engine revs freely but there's minimal drive, and no metallic grinding, it suggests a mechanical disconnection in the power path. A sheared turbine shaft would disconnect the torque converter output from the transmission input, allowing the engine and converter to spin but not transmit power to the driveline. Other options would likely cause noise or different symptoms. (Relevant to OEM diagnostic procedures)
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