Inspecting Doubles & Triples
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.
- 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.