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You see a visible space between the trailer apron (upper coupler plate) and the fifth wheel skid plate after coupling. What does this most likely mean?
- A.It is normal and shows the fifth wheel grease is thick
- B.It means the landing gear is raised too far
- C.It only matters if the trailer is loaded
- D.The trailer is probably coupled too high and the kingpin may not be properly locked in the jaws
Correct answer
D. The trailer is probably coupled too high and the kingpin may not be properly locked in the jaws
Why
The apron should rest flat on the fifth wheel with no gap when the coupling is correct. A gap is a warning of a high hook, and the combination must not be driven until it is recoupled correctly.
Manual topic: Combination Vehicles - Coupling Inspection · From the Combination Vehicles practice bank (CV-157).