What is the purpose of the locking jaws on a fifth wheel?
a.To lock the trailer doors during transport
b.To grip and hold the kingpin securely when coupled
c.To lock the sliding mechanism of the fifth wheel
d.To secure the landing gear in the raised position
Explanation
The locking jaws on a fifth wheel close around the kingpin to hold the trailer securely to the tractor. They must be checked during the pre-trip inspection to make sure they are fully closed around the kingpin with no gaps.