When coupling a tractor to a trailer, the jaws of the fifth wheel should close around the:

Shank of the kingpin.. Section 6.4: The locking jaws must close around the *shank* (the narrowest part) of the kingpin.

When coupling a tractor to a trailer, the jaws of the fifth wheel should close around the:

ANSWER BREAKDOWN
  • A. Incorrect. "Head of the kingpin." is not correct. The locking jaws must close around the *shank* (the narrowest part) of the kingpin.
  • B. Incorrect. "Base of the kingpin." is not correct. The locking jaws must close around the *shank* (the narrowest part) of the kingpin.
  • C. Correct. The locking jaws must close around the *shank* (the narrowest part) of the kingpin.
  • D. Incorrect. "Trailer apron." is not correct. The locking jaws must close around the *shank* (the narrowest part) of the kingpin.