How should a tug test be performed?

• A.Accelerate hard to prove the lock can take a shock
• B.Pull forward with the trailer brakes released
• C.Gently pull forward with the trailer brakes locked and the tractor in a low gear
• D.Back up quickly against the trailer

Why

The test needs only a gentle load against a braked trailer. Hard pulling can damage equipment or mask a partial lock, and pulling with trailer brakes released proves nothing.

Manual topic: Combination Vehicles - Coupling · From the Combination Vehicles practice bank (CV-007).

Practice this subject as a full test

More Fifth Wheel & Coupling Steps questions

• Before backing under a trailer, what should you first check about the trailer's height?
• What is the correct way to approach a trailer when starting to couple?
• Just before the fifth wheel contacts the trailer apron, what should you do?
• Why should you back very slowly for the last part of coupling?
• When you first back under and hear the fifth wheel lock, what is the next safety check?