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CDL · Coupling and Uncoupling

When inspecting the pintle hook on a converter dolly before coupling, what should you verify?

Reviewed by Jordan Morley, Editorial Lead at 247SimpleTests. Written by the 247SimpleTests Editorial Team from the official source material cited on every question.

Correct answer

The pintle hook latch closes fully and securely, the safety chains or cables are intact and rated for the load, and there is no cracking or wear on the hook itself

  1. A The pintle hook latch closes fully and securely, the safety chains or cables are intact and rated for the load, and there is no cracking or wear on the hook itself
  2. B Nothing — pintle hooks are maintenance-free
  3. C Only the paint condition
  4. D Just the color

Why this is the answer

The pintle hook is a critical safety component because it carries the dynamic forces of pulling and braking between the lead trailer and the dolly. Inspection items: the pintle hook latch must close fully and securely over the eye of the dolly's draw bar; the safety chains or cables must be intact, properly rated for the load weight, and connected through the hook so that a primary failure does not separate the dolly; the hook itself must be free of visible cracks, distortion, or excessive wear that could allow the eye to escape. A failed pintle hook drops the dolly and rear trailer onto the road. This is a serious incident.
Source: FMCSA CDL Manual 7.3.3 Pintle Hook

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About this topic: Coupling and Uncoupling

Coupling and uncoupling doubles and triples adds the converter dolly and the pintle hook to the usual fifth-wheel procedure, and the order matters — heaviest trailer first, lightest last. These questions walk through the steps and the checks that confirm a secure connection. This is one of 16 Doubles and Triples questions on coupling and uncoupling, each with a full explanation on a single study page.

New to this exam? Our CDL exam guide explains the format, scoring, and how to prepare.

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