Doubles/Triples | Coupling and Uncoupling

What is a converter dolly?

An axle assembly with a fifth wheel connecting another semitrailer.

Must every dolly have spring brakes?

No.

How do you secure a rear trailer before coupling?

Appropriate brakes and/or wheel chocks.

What coupling connects the dolly tongue to the front trailer?

A pintle hook.

What must you verify about the pintle hook?

Proper engagement and locking.

How high should the rear trailer be for coupling?

Low enough to rise slightly as the fifth wheel goes underneath.

What should the fifth-wheel jaws surround?

The kingpin’s shank.

Should there be a gap between the coupled fifth-wheel plates?

No.

Is a tug test enough by itself?

No. Also inspect visually.

Where should you uncouple?

Firm, level ground, with the combination straight.

Should you release the pintle hook while the dolly remains under the rear trailer?

No.

Why is it dangerous: The dolly tongue can spring upward.