Question:
The fifth wheel locking lever is not locked after the jaws close around the kingpin. This means that _____.
A
the coupling is not right and should be fixed before you drive the coupled unit.
explanation
Do not drive the car until you are certain that the connection is in good working order.
- Make sure there is no space between upper and lower fifth wheel. If there is space, something is wrong (kingpin may be on top of the closed fifth wheel jaws, and trailer would come loose very easily).
- Go under trailer and look into the back of the fifth wheel. Make sure the fifth wheel jaws have closed around the shank of the kingpin.
- Check that the locking lever is in the "lock" position.
- Check that the safety latch is in position over locking lever. (On some fifth wheels the catch must be put in place by hand.)
- If the coupling isn't right, don't drive the coupled unit; get it fixed.
[CDL Handbook: Coupling and Uncoupling]
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