CDL Commercial Driver's License Knowledge Test

When coupling a tractor to a semi-trailer, what must you verify about the fifth wheel?

The fifth wheel is dry and ungreased The kingpin is locked in the fifth wheel jaws and the locking lever is secured The fifth wheel plate is exactly level with the trailer floor The trailer air lines are connected before coupling

Correct Answer:

The kingpin is locked in the fifth wheel jaws and the locking lever is secured

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