Upper coupler and kingpin

Maintaining the trailer

To ensure safe operation of the tractor and trailer, inspect the upper coupler and kingpin before and after every coupling. Regularly inspect the upper coupler and kingpin to ensure that they are properly lubricated and there is no excessive damage or wear.

WARNING

Frequently inspect the coupling components of the tractor and trailer. Property loss, serious injury, or death may result if damaged coupling components fail during trailer operation.

CAUTION

• Damaged kingpin, upper coupler structure, and connecting fasteners reduce the structural integrity and degrade the trailer’s performance. • Do not operate the trailer without inspecting the upper coupler and kingpin for damage. Immediately report any damage to your supervisor and repair it. • Although the kingpin is made of hardened forged steel, it can be easily damaged, wear or broken with abuse. • Before coupling, ensure that the fifth wheel is properly lubricated and the fifth wheel jaws are open to receive the kingpin. After coupling, ensure the following: - There is no space between the upper coupler and fifth wheel. - The fifth wheel jaws have closed around the kingpin shank. - The locking lever is in the locked position.

NOTICE

A visual inspection of the coupling is mandatory and required by law.