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Inspecting Doubles & Triples

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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. Many of these items are simply more of what you would find on a single vehicle. (For example, tires, wheels, lights, reflectors, etc.) However, there are also some new things to check. These are discussed below.

7.3.1 – Additional Checks

Do these checks in addition to those already listed in Section 2, Step 5: Do Walk-around Inspection.

Coupling System Areas

  • Check fifth wheel (lower).
    • Securely mounted to frame.
    • No missing or damaged parts.
    • Enough grease.
    • No visible space between upper and lower fifth wheel.
    • 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 the tractor frame will hit landing gear, or cab will 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.

Double and Triple Trailers

  • Shut-off valves (at rear of trailers, in service and emergency lines).
    • Rear of front trailers: OPEN.
    • Rear of last trailer: CLOSED.
    • Converter dolly air tank drain valve: CLOSED.
  • Be sure air lines are supported and glad hands are properly connected.
  • If spare tire is carried on converter gear (dolly), make sure it’s secured.
  • Be sure pintle-eye of dolly is in place in pintle hook of trailer(s).
  • Make sure pintle hook is latched.
  • Safety chains should be secured to trailer(s).
  • Be sure light cords are firmly in sockets on trailers.

7.3.2 – Additional Things to Check During a Walk-around Inspection

Do these checks in addition to subsection 5.3, Inspecting Air Brake Systems.