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FIREFIGHTING OPERATIONS-continued
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TM-5-4210-233-14-P-1 Firfighting Truck 100 Ft. Aerial Ladder 1000 GPM 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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