Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A technician is troubleshooting a differential that is making a whining noise on deceleration. This symptom most commonly indicates issues with which part of the differential?
A whining noise on deceleration often points to an incorrect or worn pinion and ring gear tooth contact pattern, especially on the coast side of the gear teeth,
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Question: A technician is troubleshooting a differential that is making a whining noise on deceleration. This symptom most commonly indicates issues with which part of the differential?
Answer options:
- Input shaft bearings ✅ Pinion and ring gear tooth contact pattern
- Differential housing mounts
- Axle shaft universal joints
Correct answer: Pinion and ring gear tooth contact pattern
Explanation: A whining noise on deceleration often points to an incorrect or worn pinion and ring gear tooth contact pattern, especially on the coast side of the gear teeth, which is more noticeable under reverse torque.
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