一, fault forms: pump without water, pressure gauge and vacuum gauge pointer throbbing.

二, the reason analysis:

A,, bibulous not filled with water in the pipeline.

B, suction pipe blockage or open valve;

C, pump suction piping, instrument or serious leakage in the packing.

三, eliminate the method:

A, filled with water inside the pump;

B, open the entrance door, clean pipeline jam part;

C, plug leakage part, check whether the packing is wet or pressure.