CDL · Doubles and triples
You release the pintle hook before the converter dolly has been pulled out from under the second trailer. What is the likely result?
Correct answer: The dolly's tow bar may snap upward.
Answer options
- AThe air hoses will tear apart.
- BThe dolly's tow bar may snap upward. Correct
- CNothing happens as long as the rig stays still.
Why
While the dolly still carries the trailer's weight, releasing the pintle hook can make the tow bar fly up suddenly, which can injure you and makes recoupling very hard. Pull the dolly out from under the trailer first and only then unhook it.
About this question
Topic: Doubles and triples License: CDL
Part of these practice sets:
Where it applies: Asked in every state.
Practice the whole set
This question is part of Coupling Doubles and Converter Dollies (28 questions). Take the full set and check your score.
Practice Coupling Doubles and Converter DolliesMore questions from Coupling Doubles and Converter Dollies
- What are the basic components of a converter dolly?
- What is unique about the way triple trailers are coupled?
- You have backed the converter dolly under the rear trailer of a double and are about to check the coupling. How should that trailer's landing gear be positioned?
- What must be done with the rear shut-off valves before air can reach the second trailer's air tanks?
- Your set of twins includes a loaded rear trailer that you are about to unhook. How low should its landing gear go?
- You are about to hook up a second trailer that has no spring brakes. How can you hold it in place first?
- The second trailer you need to couple has no spring brakes, and you have no wheel chocks. What should you do before you couple it?
- You are unhooking the second semitrailer of a double. To what point do you crank down its landing gear?
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