Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A heavy-duty mining truck with an automatic powershift transmission is exhibiting sluggish acceleration and excessive engine RPM without a corresponding increase in ground speed. The transmission fluid level is correct, and there are no diagnostic fault codes present. What component is most likely failing?
Sluggish acceleration and excessive engine RPM without an increase in ground speed, especially with no fault codes, are classic symptoms of a failing torque con
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Question: A heavy-duty mining truck with an automatic powershift transmission is exhibiting sluggish acceleration and excessive engine RPM without a corresponding increase in ground speed. The transmission fluid level is correct, and there are no diagnostic fault codes present. What component is most likely failing?
Answer options: ✅ Torque converter
- Transmission control unit (TCU)
- Planetary gear set
- Main hydraulic pump
Correct answer: Torque converter
Explanation: Sluggish acceleration and excessive engine RPM without an increase in ground speed, especially with no fault codes, are classic symptoms of a failing torque converter. The torque converter is designed to multiply torque and transfer power to the transmission. A faulty TCU would likely generate fault codes or cause erratic shifting, a planetary gear set failure would often result in complete loss of specific gears or loud noises, and a main hydraulic pump issue would affect overall transmission operation and fluid pressure, often with more widespread symptoms.
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- What is the primary purpose of a 'lock-up clutch' in a modern heavy-duty torque converter?
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- During a pre-trip inspection of an air-braked commercial vehicle, the operator observes a sudden drop in air p
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