During a pre-trip vehicle inspection of a commercial vehicle equipped with power steering and a standard 20-inch diameter steering wheel, a driver inspects the steering mechanism with the engine running. Which of the following observations indicates a safety defect that requires correction before operating the vehicle?
- ASteering wheel rim movement of approximately 1.25 inches (about 7 degrees) before the front tires begin to turn
- BPower steering reservoir fluid registering halfway between the 'Add' and 'Full' marks on the dipstick
- Steering wheel free play measuring 3.0 inches (approximately 15 degrees) at the rim before engaging the linkageAnswer
- DPower steering pump drive belt deflecting 1/2 inch under moderate thumb pressure midway between pulleys
Answer
Steering wheel free play measuring 3.0 inches (approximately 15 degrees) at the rim before engaging the linkage
On a commercial vehicle equipped with power steering and a 20-inch steering wheel, free play must not exceed 10 degrees, which corresponds to approximately 2 inches of play along the steering wheel rim. A measurement of 3.0 inches (15 degrees) indicates excessive play in the steering column, gearbox, or linkage joints, creating a dangerous delay in vehicle response.
Step-by-Step Solution
Key Concept
Allowable Steering Wheel Free Play and Defect Recognition
Estimated Time:1m 0s