Figure 7-15.—Air and electrical connections.the front of the trailer (fig. 7-15). Trailers in the NCF2. Ensure the locking jaws are open.normally have two electrical connections adaptable foreither a 12- or 24-volt electrical system.Coupling and UncouplingCoupling and uncoupling correctly is basic to thesafe operation of tractor-trailers. Incorrect coupling anduncoupling can be dangerous and cause unnecessaryequipment damage and downtime. The basic steps forcoupling a tractor to a trailer are as follows:Step 1. Inspect fifth wheelCheck for damaged and missing parts.Ensure the mounting to the tractor is secure andthere are no cracks in the frame.Ensure the fifth wheel plate is greased. Failure tokeep the fifth wheel plate lubricated could causesteering problems because of friction betweenthe tractor and the trailer.Ensure the fifth wheel is in proper position forcoupling by completing the following checks:1. Ensure the wheel is tilted down towards therear of the tractor.7-143. If equipped with a sliding fifth wheel assem-bly, ensure it is locked in position.4. Ensure the trailer kingpin is not bent orbroken.Step 2. Inspect area and chock wheelsEnsure the area around the tractor and trailer areclear of obstacles.Check the trailer wheels and ensure chocks arein place and the spring brakes are engaged.Check all cargo (if any) and ensure it is securedfrom movement due to the tractor being coupledto the trailer.Step 3. Position tractorPosition the tractor directly in front of the trailer.(Backing under the trailer at an angle could pushthe trailer sideways and bend or break the landinggear.)
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