Connecticut CDL Combination Vehicles Permit Practice Test 2025 - Free CDL Practice Questions and Study Guide

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What does it indicate if the fifth wheel locking lever is not locked after the jaws close around the kingpin?

The coupling is secure and ready

The coupling is not proper and needs adjustment

When the fifth wheel locking lever is not locked after the jaws have closed around the kingpin, this signifies that the coupling has not been secured properly. The locking lever is a critical component in ensuring that the connection between the tractor and trailer is safe and secure. If the lever does not lock, it indicates that the jaws have not fully engaged with the kingpin, which can lead to a dangerous situation while driving. Therefore, adjustment or re-coupling is necessary to ensure that the connection is properly established before operation. The inability of the locking lever to engage could stem from several issues, such as an improperly positioned trailer, dirt or damage in the fifth wheel area, or a malfunction within the fifth wheel mechanism itself. Addressing this condition is crucial to prevent accidents related to trailer detachment during transit.

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The kingpin is damaged

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