When making a visual check of a coupling, you should:

Question

When performing a visual check of coupling devices, you should make sure there is no space between the upper and lower fifth wheel. Ensure that the locking jaws are securely closed around the kingpin.

Accepted Answer

Make sure there is no space between the upper and lower fifth wheel.

Answer

Make sure the kingpin is polished.

Answer

Look for mud on the fifth wheel.

Answer

Loosen the air hoses.