Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A tandem-axle logging truck exhibits severe 'dog tracking' (crabbing) while driving straight down a level road. The technician has confirmed that tire pressures are correct and there are no obvious visual signs of damage to the suspension components. What is the most likely underlying cause?
Dog tracking, or crabbing, occurs when the rear wheels are not tracking directly behind the front wheels. This is most commonly caused by misalignment of one or
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Question: A tandem-axle logging truck exhibits severe 'dog tracking' (crabbing) while driving straight down a level road. The technician has confirmed that tire pressures are correct and there are no obvious visual signs of damage to the suspension components. What is the most likely underlying cause?
Answer options: ✅ Misalignment of one or both tandem axles.
- A worn steering linkage drag link.
- An unbalanced drive axle propeller shaft.
- Incorrect caster angle on the steer axle.
Correct answer: Misalignment of one or both tandem axles.
Explanation: Dog tracking, or crabbing, occurs when the rear wheels are not tracking directly behind the front wheels. This is most commonly caused by misalignment of one or both of the tandem axles, forcing the vehicle to steer slightly to compensate. A worn drag link would primarily affect steering play, an unbalanced drive shaft would cause vibration, and incorrect caster angle primarily affects steering returnability and stability, not dog tracking.
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