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Where exactly should the locking jaws close on the kingpin?
- A.Around the very bottom tip only
- B.Around the shank (the narrow neck) of the kingpin, not around its head or flange
- C.On the apron plate itself
- D.Anywhere on the pin is equally safe
Correct answer
B. Around the shank (the narrow neck) of the kingpin, not around its head or flange
Why
The jaws are shaped to grip the shank, with the head preventing pull-out. A lock around the head means the pin is sitting too high and can escape.
Manual topic: Combination Vehicles - Coupling Equipment · From the Combination Vehicles practice bank (CV-115).