BC Transit – Air Brake Course

The “Fifth Wheel”
The fifth wheel is located on
the centre of the frame rails
directly behind the cab of the
tractor.
The release handle is used to
open the locking jaws prior to
connecting to or disconnecting
from the trailer. The coupler
arm helps the king pin of the
trailer to guide itself into the
locking jaws.
The pivot point allows the fifth
wheel to move up and down
with the trailer as the coupled
unit moves over uneven
roadways and hills.
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