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Difficulty: EasySteering System Inspection

During a pre-trip inspection of a commercial motor vehicle equipped with power steering and a 20-inch steering wheel, what is the maximum allowable steering wheel free play before the front wheels must begin to turn?

  1. Approximately 2 inches (or about 10 degrees of movement)Answer
  2. B
    Approximately 4 inches (or about 20 degrees of movement)
  3. C
    Approximately 6 inches (or about 30 degrees of movement)
  4. D
    Zero free play (any steering wheel movement must immediately turn the front wheels)

Answer

Approximately 2 inches (or about 10 degrees of movement)
Under standard commercial driver licensing and safety inspection criteria, steering wheel free play on a power steering-equipped vehicle must not exceed 10 degrees, which is approximately 2 inches of movement at the rim of a standard 20-inch steering wheel.

Step-by-Step Solution

1
Identify the standard tolerance angle for steering wheel free play in commercial motor vehicles.
Maximum allowable free play is 10 degrees.
Safety regulations mandate a 10-degree maximum to ensure responsive steering control and identify worn components.
2
Calculate the linear rim distance corresponding to 10 degrees on a 20-inch diameter steering wheel.
10 degrees corresponds to approximately 2 inches of movement along the outer circumference of a 20-inch steering wheel.
Pre-trip inspection guidelines quantify steering lash by both angular degrees and rim travel distance.

Key Concept

Maximum allowable steering wheel free play during vehicle inspection
Estimated Time:45s
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Topics

Steering System Inspection

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