A grader operating on a construction site exhibits excessive 'bump steer' and rapid, uneven tire wear on the front wheels. The technician observes that the tie rod ends have very little articulation remaining and the steering arm is slightly bent. What is the most likely underlying cause?

Question: A grader operating on a construction site exhibits excessive 'bump steer' and rapid, uneven tire wear on the front wheels. The technician observes that the tie rod ends have very little articulation remaining and the steering arm is slightly bent. What is the most likely underlying cause?

Answer options:

• Incorrect caster adjustment.
• Worn kingpins or ball joints. ✅ Damaged steering linkage components.
• Insufficient tire pressure.

Correct answer: Damaged steering linkage components.

Explanation: Damaged steering linkage components, such as a bent steering arm or tie rod ends with limited articulation, will directly lead to 'bump steer' (where bumps cause the wheels to steer independently) and rapid, uneven tire wear due to improper geometry. While worn kingpins or ball joints contribute to looseness, the specific symptoms point more directly to linkage damage. Caster adjustment primarily affects steering returnability, and tire pressure would cause generalized wear, not specific to bump steer.