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Difficulty: MediumSteering Techniques

A driver is conducting a pre-trip inspection on a commercial vehicle equipped with power steering and a 20-inch steering wheel. What is the maximum allowable amount of steering wheel free play before the steering mechanism is considered unsafe?

  1. A
    Up to 25 degrees of movement, or about 4 inches at the rim
  2. About 10 degrees of movement, or roughly 2 inches at the rimAnswer
  3. C
    Zero degrees of movement, because power steering gearboxes must possess no free play whatsoever
  4. D
    Up to 45 degrees of movement, as long as the front steer tires respond once the wheel passes the center line

Answer

About 10 degrees of movement, or roughly 2 inches at the rim on a 20-inch wheel.
According to official commercial driver safety standards, steering wheel free play should not exceed approximately 10 degrees, which corresponds to roughly 2 inches of movement at the rim of a standard 20-inch steering wheel. Free play beyond this limit can make vehicle steering difficult and delayed.

Step-by-Step Solution

1
Identify the standard regulatory limit for steering wheel free play in a commercial motor vehicle.
Safety standards specify that steering play must not exceed approximately 10 degrees.
Excessive free play delays steering response and makes keeping the vehicle within its lane difficult.
2
Determine the linear distance along the rim corresponding to a 10-degree turn on a 20-inch steering wheel.
A 10-degree rotation on a 20-inch steering wheel corresponds to approximately 2 inches of travel at the rim circumference.
Knowing both degree and inch limits allows drivers to accurately assess steering condition during a walkaround or pre-trip check.

Key Concept

Steering wheel free play tolerance and inspection limits
Estimated Time:1m 0s
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Topics

Steering Techniques

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