Fifth Wheel
The coupling device on a tractor that connects to a trailer's kingpin.
Definition
The fifth wheel is a horseshoe-shaped coupling device mounted on the rear of a tractor's frame that connects to the trailer's kingpin. It allows the tractor and trailer to pivot during turns. Proper coupling and uncoupling procedures are critical safety skills tested during CDL skills exams. Drivers must perform a tug test after coupling and visually inspect the fifth wheel locking mechanism during every pre-trip inspection.
FAQ
What does Fifth Wheel mean?
The coupling device on a tractor that connects to a trailer's kingpin.
Why is Fifth Wheel important for truck drivers?
Understanding fifth wheel is essential for truck drivers because it directly impacts your daily operations, pay, or compliance. The fifth wheel is a horseshoe-shaped coupling device mounted on the rear of a tractor's frame that connects to the trailer's kingpin. It allows the tractor and trailer to pivot during turns.