80-55 irrigation water pump 1)Lift:55m 2)Flow:65m3/h The centrifugal pumps ... .PrincipleYou should fill the pump with water before start, then the impeller rotate with high speed under the engine, when the impeller turns ... ,the rotate speed is too high1,adjust2,pump shaft bended2,adjust or replace3,bearing wear seriously3,replace bearing 80-55 irrigation water pump