compartment. Pulling back on a lever opens a dischargevalve and permits the flow of fuel into the piping system.Squeezing the trip rod operation handle mounted on thelever and moving the lever forward locks thecompartment valve and shuts off the flow of fuel.In an emergency, the discharge valve remote controllever, located on the left side of the discharge valvecontrol operating lever bank, provides a means oflocking all discharge valves. Pulling the handle causesa release lever to trip the operating levers and locks thevalves.OPERATION.— When operating the fuel tanktruck for discharging fuels, follow instructionsprescribed in the manufacturer’s operating manual. Thegeneral instructions which follow are typical of the typeof fuel tank truck used in the NCF.Tank trucks are used to haul and dispense fuels.(See fig. 6-20.) The tank truck shown is equipped witha stainless steel, 1,200-gallon tank body, which isdivided into two 600-gallon compartments (fig. 6-21).The fuel delivery system is equipped with an uprightfilter/separator and meter. Since there are only two tankcompartments, the discharge valve control has twooperating levers, as shown in figure 6-21. There is aspeed control linkage assembly that controls the speedof the engine, power takeoff, and delivery pump.The filter/separator in figure 6-21 is equipped withthree filter elements, three go no-go fuses, a pressuregauge, and an automatic dump (drain) valve. Theprimary function of the filter element is to collect solidcontaminants and separate water from the fuel.The go no-go fuses shut off the fuel flow if water orsolid contaminants exceed a safe level; the shutoff offuel flow indicates the falters are not operating properly.If such a malfunction exists, it must be located andcorrected and the fuses replaced before operation iscontinued.The automatic dump (drain) valve is float-operated.The float sinks in fuel but rises in water. When water ispresent in the valve housing, the float rises, the valveopens, and the water drains away through the valve draintube. Open the automatic dump (drain) valve duringfueling operations.Check the pressure differentialevery day that equipment is in use and while the pumpis operating.Close the meter drain valve, delivery pump draincock, and filter/separator drain valve. Open theautomatic dump (drain) valve. Enter the driver ‘Scompartment and start the engine; depress the clutch,and put the transfer case shift lever in NEUTRAL; placethe PTO lever in the ENGAGED position; then place thetransmission gearshift lever in the gear positionrecommended by the manufacturer, and release theclutch.Figure 6-20.-Fuel-service truck.6-26
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