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Figure  7-19.Air  line  storage  dummy  couplers.
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Equipment Operator Basic - Beginning construction equipment operators manual
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Turns When making turns with the tractor-trailer, you must allow for the overall length of the unit. Remember: The tractor-trailer is hinged in the middle, and the trailer has a tendency to cut the corners, rather than follow the tractor. For this reason, it is necessary to make a wider turn than when turning with a straight truck. Figure 7-20.—Right turn. AUTOMATIC   TRANSMISSIONS.—   Some tractors  in  the  NCF  are  equipped  with  automatic transmissions. A low range can be selected to have a greater engine braking power when going down grades. The lower ranges prevent the transmission from shifting up beyond the selected gears. Shifting an automatic transmission  incorrectly  can  cause  serious  damage  to the  transmission;  therefore,  operators  must  study  the operator’s manual for techniques of shifting automatic transmission. RETARDERS.—  Some tractors are equipped with a retarder that helps slow a vehicle, reducing the need for using the brakes. One common retarder is known as the  “jake  brake.”   Retarders reduce brake wear and provide another means to slow down. Retarders are controlled by the operator and are either exhaust, engine, hydraulic, or electric. CAUTION Turning turn signals on well in advance of starting the turn is extremely important. This action warns other drivers that a turn is going to be made and allows them to drive safely. RIGHT TURNS.—  When  performing  a  right-hand turn, turn slowly to give yourself and others time to avoid  problems.  If  you  cannot  make  the  right  turn without  swinging  into  another  lane,  turn  wide  as  you complete the turn, as shown in figure 7-20, view A. Keep the rear of the tractor-trailer close to the curb to stop any drivers from passing on the right. If you must cross into the oncoming traffic lane when making your turn, watch for vehicles coming towards you. Give them room to go by or stop; however, do not back up for them, because you may have a vehicle directly behind you. Do not turn wide to the left as you start the turn to the right, as shown in figure 7-20, view B, because a following driver may think you are turning left and try to pass you on the right. Remember: If you turn too sharp while making a right turn, your trailer will ride up the curb and possibly run over obstructions (fig. 7-21). Figure  7-21.—Incorrect  right  turn. 7-19







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