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Question

Difficulty: MediumSteering System Inspection

While inspecting the mechanical steering linkages and hardware on a commercial motor vehicle, a driver examines several connection points. Which of the following findings represents an unacceptable safety defect that must be corrected before operating the vehicle?

  1. A
    Steering wheel free play measuring approximately 5 degrees on a power steering system.
  2. A missing cotter pin on a castle nut connecting the drag link to the pitman arm.Answer
  3. C
    Power steering fluid level resting midway between the 'Add' and 'Full' marks on the dipstick.
  4. D
    Power steering pump belt deflection of one-quarter inch when pressed at the center of the belt span.

Answer

A missing cotter pin on a castle nut connecting the drag link to the pitman arm is an unacceptable defect that requires immediate correction.
Steering linkage components—including the pitman arm, drag link, steering knuckles, and tie rod—must be structurally sound and securely fastened. Castle nuts must be tight and locked with cotter pins. A missing cotter pin allows the nut to vibrate loose, creating an immediate danger of steering detachment and vehicle control loss.

Step-by-Step Solution

1
Evaluate the mechanical security of steering linkage hardware.
Identify that linkage joints rely on castle nuts locked in place with cotter pins to prevent fastener back-off and mechanical separation.
Commercial vehicle safety standards strictly prohibit operating with missing, loose, or broken steering fasteners.
2
Compare normal operating parameters for steering free play, belt deflection, and fluid level against allowable tolerances.
5 degrees of free play, 1/4 inch belt deflection, and fluid between 'Add' and 'Full' all meet normal operating standards.
Safe operating tolerances allow minor free play up to 10 degrees and reasonable belt play without constituting defects.

Key Concept

Steering Linkage Hardware and Fastener Inspection
Estimated Time:1m 0s
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Topics

Steering System Inspection

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