Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A road grader equipped with a tandem drive independent suspension system exhibits unusual tire wear patterns on the inner edges of both tandem axle tires. The vehicle tracks straight, and steer axle tires show normal wear. What is the MOST probable cause?
Excessive negative camber, where the top of the tire tilts inwards, will cause accelerated wear on the inner edge of the tire. In an independent tandem axle, mu
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Question: A road grader equipped with a tandem drive independent suspension system exhibits unusual tire wear patterns on the inner edges of both tandem axle tires. The vehicle tracks straight, and steer axle tires show normal wear. What is the MOST probable cause?
Answer options:
- Insufficient articulation joint lubrication.
- Incorrect caster angle on the steer axle. ✅ Excessive negative camber on the tandem wheels.
- Worn kingpins on the steer axle.
Correct answer: Excessive negative camber on the tandem wheels.
Explanation: Excessive negative camber, where the top of the tire tilts inwards, will cause accelerated wear on the inner edge of the tire. In an independent tandem axle, multiple components like worn individual wheel bearings, bent axles, or damaged suspension arms can contribute to this issue.
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