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 TM 55-1905-219-14-8
4-7.4A. PUMP - MAINTENANCE INSTRUCTIONS.
a. The fire pump impeller is enclosed within the pump housing and is mounted on the crankshaft. The
impeller is secured by a bolt and behind the impeller is a water seal which prevents water from leaking out of
pump housing. Water is drawn into the pump housing when air is evacuated from the housing and the suction
hose by the action of the priming pump. As water is drawn into the pump housing the impeller throws the water
outward, creating pressure within the impeller housing. A pressure gage is provided to measure the pump
discharge pressure.
b. The manual priming consists of priming bowl and plug in the pump housing. Its function is to allow
water to be poured into the pump housing to prime the fire pump when lifting water greater than 20 feet (6 m).
While the pump is operating, the plug should be securely in place.
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