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6.5 – Inspecting a Combination Vehicle

Use the seven-step inspection procedure described in Section 2 to inspect your combination vehicle. There are more things to inspect on a combination vehicle than on a single vehicle. (For example, tires, wheels, lights, reflectors, etc.) However, there are also some new items to check. These are discussed below.

6.5.1 – Additional Things to Check During a walk around Inspection

Perform these checks in addition to those already listed in Section 2.

Check fifth wheel (lower).

  • Securely mounted to frame.
  • No missing or damaged parts.
  • Enough grease.
  • No visible space between 5th wheel and trailer.
  • Locking jaws around the shank, not the head of kingpin.
  • Release arm properly seated and safety latch/lock engaged.

Check fifth wheel (upper).

  • Glide plate securely mounted to trailer frame.
  • Kingpin not damaged.

Air and electric lines to trailer.

  • Electrical cord firmly plugged in and secured.
  • Air lines properly connected to glad hands, no air leaks, properly secured with enough slack for turns.
  • All lines free from damage.

Sliding fifth wheel.

  • Slide not damaged or parts missing.
  • Properly greased.
  • All locking pins present and locked in place.
  • If air powered, no air leaks.
  • Check that fifth wheel is not so far forward that tractor frame will hit landing gear or the cab hit the trailer during turns.

Landing Gear

  • Fully raised, no missing parts, not bent or otherwise damaged.
  • Crank handle in place and secured.
  • If power operated, no air or hydraulic leaks.

Multiple-Choice Questions:

Question #346 (1 of 1)

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When inspecting a combination vehicle, you must check which of the following?

  • All of these must be checked
  • Glide plate securely mounted to trailer frame
  • Locking jaws around the shank, not the head of kingpin
  • 5th wheel release arm properly seated and safety latch/lock engaged

When inspecting a combination vehicle, you must check the following:

  • Glide plate securely mounted to trailer frame
  • Locking jaws around the shank, not the head of kingpin
  • Release arm properly seated and safety latch/lock engaged
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