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During inspection you find the kingpin is noticeably loose in the closed jaws when you rock the trailer brakes on and pull gently. What does this suggest?
- A.A perfectly normal, like-new coupling
- B.That more grease will fix the wear
- C.Excessive wear in the kingpin, the jaws, or both, which needs repair before the trailer is used
- D.That the trailer is too new
Correct answer
C. Excessive wear in the kingpin, the jaws, or both, which needs repair before the trailer is used
Why
Some minimal movement is normal, but noticeable slack signals worn metal on one or both sides of the joint. That wear only grows under load and must be measured and repaired.
Manual topic: Combination Vehicles - Coupling Equipment · From the Combination Vehicles practice bank (CV-122).