Ontario Class A Practice Test · Question
During a pre-trip inspection, what would an improperly lubricated or worn fifth-wheel jaw indicate?
A worn or improperly lubricated fifth-wheel jaw can cause excessive play between the tractor and trailer, leading to instability, damage to components, or even
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Question: During a pre-trip inspection, what would an improperly lubricated or worn fifth-wheel jaw indicate?
Answer options:
- It would make the trailer easier to uncouple. ✅ It could lead to excessive movement between the tractor and trailer, potentially causing damage or separation.
- It would improve fuel efficiency due to reduced friction.
- It is a minor cosmetic issue that does not affect safety.
Correct answer: It could lead to excessive movement between the tractor and trailer, potentially causing damage or separation.
Explanation: A worn or improperly lubricated fifth-wheel jaw can cause excessive play between the tractor and trailer, leading to instability, damage to components, or even a dangerous detachment of the trailer. Proper lubrication and condition are vital for secure coupling.
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