![]() ![]() If you don't check the height of the trailer before backing under, you could potentially drop the king pin over the front of the 5th wheel. You could potentially damage the landing gear if you forget to wind these up before pulling away. If you back into the trailer and hook up the air lines and electrical before cranking up the dollies (landing gear), and you become distracted. SAY: "If this was a new trailer, I would perform a complete pre-trip inspection on the unit." COULD KNOW Get out of the truck – crank up the dollies and stow the crank handle.Re-enter the truck and perform a tug test in low gear DOLLIES (LANDING GEAR) Go under the trailer – the jaws are locked behind the king pin.The locking dog is engaged OR the 5th wheel is secure to the frame.The locking handle is in the locked position.The adjusting nut is in the locked position.There is no light between the fifth wheel and the trailer apron.Back under the trailer until you can hear the jaws close – or you bang against the pin.Check that there isn't any daylight between the trailer apron and the 5th wheel plate - this indicates that the trailer is at the correct height to hook-up.Reach in the truck, and raise the air suspension The fifth wheel jaws are in line with the King pin.Go under the trailer directly behind the truck: Stop at the mid-point of the truck's duals and check: Apply the parking brakes and get out of the truck.Back up until the front of the trailer is at the centre point of the front rear tires - STOP & apply brakes. ![]() Line up truck with trailer – sidewalls of truck duals should be 1-2” in from the edge of the trailer.WAYS TO REMEMBER PDA - Public Displays of Affection OR Personal Digital Assistant (for the older drivers that remember Palm Pilots (ca 1990s) Always check with a flashlight that the 5th Wheel jaws are locked around the king pin. ![]()
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