TM 5-4320-200-13 & PSection III.PRINCIPLES OF OPERATION1-10.HOW IT WORKS.When the engine is running a shaft with attached fins (impeller)turns inside the pump water chamber.This causes water to be drawninto the chamber thru an inlet opening (port).Water then is dis-charged thru an outlet opening (port).A check valve located in the suction port keeps water from running back out of the pump when it isstopped.IMPELLER TURNS1-8
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