Coupling & Uncoupling第 3 / 60 题
Before backing under a trailer, the fifth wheel should be tilted how?
a.Tilted down toward the rear of the tractor
b.Kept perfectly level
c.Tilted down toward the rear so the kingpin can rise into the jaws
d.Locked flat with jaws already closed
解析
The fifth wheel should be tilted down toward the rear of the tractor so the kingpin can slide up the ramp and into the locking jaws. The jaws must be open before backing under. A properly tilted fifth wheel allows smooth coupling and correct kingpin seating.
免费刷完整 60 道题库 — 无需注册。
同考点相关题目
- Before backing a tractor under a trailer, where should the trailer be positioned relative to the fifth wheel?
- What is the correct order for positioning the tractor before coupling to a trailer?
- When connecting the glad hands, what must you check to avoid a dangerous coupling mistake?
- After the kingpin has locked into the fifth wheel, how should you test that the coupling is secure?
- After the tug test, why should you go under the trailer and look into the back of the fifth wheel?
- When should the locking jaws be closed around the kingpin?