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Question

Difficulty: MediumSteering System Inspection

Prior to departing on a haul, a commercial driver inspects the steering gear assembly and hydraulic power steering system in the engine compartment. Which of the following findings constitutes a critical defect that must be repaired before operating the vehicle?

  1. A
    The power steering pump drive belt deflects 1/2 inch at the center of the span under moderate thumb pressure.
  2. One or more mounting bolts securing the steering gear box to the vehicle frame rail are missing or loose.Answer
  3. C
    The power steering fluid level rests midway between the ADD and FULL marks on the dipstick at operating temperature.
  4. D
    The steering column intermediate shaft universal joint has no radial play and its retaining pinch bolt is fully torqued.

Answer

Missing or loose steering gear box mounting bolts.
The steering gear box transfers rotational input from the steering wheel directly to the pitman arm and mechanical linkages. Loose or missing mounting bolts allow the gear box to shift against the frame rail, causing erratic steering response and potential structural detachment.

Step-by-Step Solution

1
Evaluate the condition and security requirements of the steering gear box mounting hardware.
The steering gear box must be securely fastened to the chassis frame with no missing bolts, broken welds, or loose fasteners.
The gear box absorbs and translates high mechanical torque from the steering shaft to the linkage; any mounting failure causes dangerous misalignment or total control loss.
2
Assess the power steering belt, fluid level, and shaft joint against standard operational tolerances.
Deflection of 1/2 inch on the belt, fluid midway between ADD and FULL, and a tight universal joint are all standard acceptable conditions.
Commercial vehicle inspection standards permit normal operating ranges for fluid and belt tension while maintaining zero tolerance for loose structural steering mounts.

Key Concept

Steering Gear Box and Hydraulic System Inspection
Estimated Time:1m 0s
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Topics

Steering System Inspection

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