Practice question

What should you check regarding the fifth wheel locking jaws during trailer coupling inspection?

  1. Ensure the locking jaws are open so the trailer can swivel freely off the tractor
  2. Visually verify that the locking jaws are fully closed and securely latched around the narrow shank (collar) of the trailer kingpin
  3. Ensure there is at least 5 centimeters of daylight gap between fifth wheel and trailer apron
  4. Lubricate the kingpin locking jaws with brake fluid

Answer: B — Visually verify that the locking jaws are fully closed and securely latched around the narrow shank (collar) of the trailer kingpin

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