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Question

Difficulty: EasySteering System Inspection

An operator is conducting an under-hood and front axle steering inspection on a commercial motor vehicle. Which of the following conditions represents a critical mechanical defect that makes the vehicle unsafe to operate?

  1. A
    Power steering fluid level resting between the ADD and FULL marks on the dipstick
  2. A missing cotter pin on a castle nut securing the steering linkageAnswer
  3. C
    A power steering pump drive belt with 1/2 inch of play at the center of the span
  4. D
    Steering wheel free play measuring 5 degrees on a power steering equipped vehicle

Answer

A missing cotter pin on a castle nut securing the steering linkage represents a critical safety defect.
During a commercial motor vehicle steering inspection, all steering components—including the pitman arm, drag link, and tie rod—must be tightly secured with all nuts, bolts, and cotter pins present and intact. A missing cotter pin allows a castle nut to back off, leading to joint separation and an immediate loss of directional control.

Step-by-Step Solution

1
Evaluate standard operating tolerances for steering fluid, belt deflection, and free play.
Fluid between ADD and FULL, 1/2 inch belt deflection, and 5 degrees of steering play are all within safe manufacturer tolerances.
Commercial driver pre-trip inspection standards permit small, specified amounts of play and normal fluid ranges.
2
Identify structural fasteners and safety retention hardware on steering linkage joints.
A missing cotter pin leaves the castle nut unsecured, allowing it to vibrate loose.
Steering linkages must have 100% hardware integrity with no missing cotter pins, cracked arms, or loose joints to prevent mechanical disconnection.

Key Concept

Steering Linkage Hardware Integrity and Defect Identification
Estimated Time:45s
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Topics

Steering System Inspection

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