CDL General Knowledge TestCombination Vehicles (if applicable)Hard
During a pre-trip inspection of a combination vehicle, a driver finds that the fifth wheel skid plate has deep gouges and cracks. What is the appropriate action?
- AApply extra grease to the skid plate and proceed with caution.
- BNote the damage and schedule repair at the next service interval.
- CFill the gouges with epoxy and smooth the surface.
- DContact maintenance immediately; the vehicle is unsafe to operate.
Show answer & explanationAnswer & explanation
Correct answer: D. Contact maintenance immediately; the vehicle is unsafe to operate.
Deep gouges and cracks in the fifth wheel skid plate indicate structural damage that could compromise the integrity of the coupling. This is a critical safety defect that could lead to trailer separation or instability, making the vehicle unsafe to operate until repaired.
Why the other options are wrong
- A. Grease does not fix structural damage and can hide further issues.
- B. This is a critical safety defect that requires immediate attention, not deferred maintenance.
- C. Epoxy is not a suitable repair for structural damage on a critical component like a fifth wheel skid plate.
Fifth Wheel Structural Integrity
The fifth wheel skid plate, along with the entire assembly, must be free from structural damage like deep gouges or cracks to ensure safe coupling and prevent trailer separation.
- Cracks or deep gouges indicate structural failure.
- Compromises coupling safety.
- Requires immediate repair; vehicle is out of service.
Memory trick: Cracks and gouges, no go, call the mechanics, let them know.