Home › CDL Practice Tests › Combination Vehicles Questions › Question 119
Why is excessive wear in the locking jaws a safety problem?
- A.Worn jaws make coupling quieter
- B.Play improves turning
- C.Wear has no effect once locked
- D.Worn jaws allow too much play around the kingpin, causing pounding, accelerated wear, and a risk of separation
Correct answer
D. Worn jaws allow too much play around the kingpin, causing pounding, accelerated wear, and a risk of separation
Why
A loose grip lets the kingpin hammer inside the jaws with every start, stop, and bump. That pounding grows the wear quickly and can end in the pin pulling free.
Manual topic: Combination Vehicles - Coupling Equipment · From the Combination Vehicles practice bank (CV-119).