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Daily inspection test
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9. Coupling or locking mechanism is damaged or fails to lock

You must know the importance of having couplers properly locked, the locking methods used by couplers, how to visually inspect these locks, and also know that a vehicle has this major defect when any coupler or lock is damaged or isn’t properly locked.

Procedure:
Fifth-wheel couplers:

    • Position yourself to be able to see the coupler assembly.
    • Visually verify the position of the fifth-wheel release handle.
    • Visually check the position of any exposed mechanism on the fifth wheel.
    • Describe the following procedure. Get under the trailer at the rear of the tractor and visually inspect the position of the fifth-wheel locking jaws.
Pintle-hook couplers:

    • Position yourself to be able to see the coupler assembly.
    • Visually check the position and condition of the latching and locking mechanism.