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You are coupling a semi-trailer to your tractor but have not yet backed under, the trailer is at the right height when:

It will be raised slightly when the tractor is backed under it.

The kingpin is about 1 ¼ inches above the fifth wheel.

The end of the kingpin is even with the top of the fifth wheel.

You should not back a tractor under a trailer until the whole air system is:

Between 60 and 80 PSI.

At normal pressure.

Bled down to half the maximum pressure.

Which part of the kingpin should the locking jaws close around?

The base.

The shank.

The head.

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