Figure 6-21.—Fuel-service truck diagram.CAUTIONAllowing the engine to run with thetransmission engaged and the transfer case shiftlever in NEUTRAL without the PTO in theENGAGE position will cause bearing failure inthe transfer case.Be sure to shift thetransmission gearshift lever to NEUTRALwhen not operating the power takeoff.After the fuel dispensing pump is engaged set thethrottle rpm to the manufacturer’s recommendedsetting. Move the discharge valve control levers to theopen position; and be sure, before pumping operationsbegin, to attach the grounding wire to the vehicle beingserviced. Open the pump delivery line hose and squeezethe nozzle operating lever to discharge the fuel.After discharging the fuel, close the pump deliveryline gate valve, and move the discharge valve controloperating lever to the CLOSED position.TIhen close theautomatic dump valve drain tube valve. Return to thedriver’s compartment; set the rpms to idle, depress theclutch and place the transmission gearshift lever inNEUTRAL; then place the transfer power takeoffshifting lever to DISENGAGED, and stop the engine.When changing from one type of fuel to another,drain and flush the fuel compartments, pumpfilter/separator, service lines, manifold, meter, gauge,and dispensing hoses and nozzles.NOTE: All pumping mechanisms are notcontrolled and operated in the same manner. Each makeor model operates differently. If you are in doubt as tothe proper pump operation and maintenance procedures,study the operator’s manual and the caution andinstruction plates located near the pump and controlmechanisms.Fuel SafetyDrivers of fuel tank trucks must observe safe drivingpractices, some of which are listed below.l Drive defensively and make allowances for otherdrivers.. Make turns onlyintent to other drivers.from proper lanes, and signalNever leave the proper lane6-27
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