Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A heavy-duty truck with a selectable differential lock is operating over uneven terrain at a quarry. The operator engages the rear differential lock. How does this affect the vehicle's turning ability?
Engaging the differential lock forces both wheels on an axle to rotate at the same speed. During a turn, the outer wheel needs to travel a longer distance than
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Question: A heavy-duty truck with a selectable differential lock is operating over uneven terrain at a quarry. The operator engages the rear differential lock. How does this affect the vehicle's turning ability?
Answer options:
- It significantly improves the turning radius.
- It has no effect on turning ability. ✅ It makes turning more difficult and can cause 'tire scrub'.
- It automatically disengages during turns to prevent damage.
Correct answer: It makes turning more difficult and can cause 'tire scrub'.
Explanation: Engaging the differential lock forces both wheels on an axle to rotate at the same speed. During a turn, the outer wheel needs to travel a longer distance than the inner wheel. With the differential locked, both wheels are forced to turn at the same speed, causing one wheel to slip (tire scrub), making turning difficult and potentially damaging tires and driveline components, as highlighted in OEM operator manuals.
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