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Priming the Pump
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TM-5-4210-233-14P-1 Twin Agent 4x4 Firefighting Truck Model No. CM-KFT-B Manual
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Pumping from Water Tank.
TM 5-4210-233-14&P-1 2-13.  FIREFIGHTING OPERATIONS - Continued NOTE If  pumping  from  vehicle  water  tank,  be  sure  water  tank  is  full. When pumping from draft, all valves must be closed to prevent air leaks. d. Pumping from Draft. (1) Close all valves. (2) Connect "hard" suction hose to SUCTION connection, and attach suction strainer to intake end of hose. (3) To get full capacity and a quick prime, and to maintain pump efficiency: (a) Position vehicle as near as possible to water supply. (b) Use side inlet to attain full capacity. (c) Avoid humps or sharp bends in suction hose. Make sure no part of hose is higher than pump suction inlet NOTE Air  pockets  in  suction  hose  may  cause  loss  of  prime  or  erratic pump action, and may reduce pump capacity. (d)   Make sure all suction connections and suction caps are tight, and all discharge and drain valves are closed. (e)   Immerse  suction  strainer  at  least  two  feet  below  water  surface  to  prevent  pump  from  drawing air. NOTE Whirlpools  forming  above  suction  strainer  indicate  that  strainer is too close to surface of water. (f) Make sure suction strainer is far enough from bottom to prevent pumping sand, gravel, and other foreign matter. NOTE The   amount   of   material   in   suspension   in   lakes,   ponds,   and streams    will    gradually    wear    impeller    hubs    and    wear-ring surfaces.      Under   favorable   operating   conditions,   these   parts have  a  long  life;  however,  the  presence  of  sand  and  gravel  in the drafted water may seriously impair pump efficiency and life. (4)   With the engine at idle speed, select PUMP mode using the ELECTRIC PUMP SHIFT switch on the cab instrument panel. 2-50

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