Plastic centrifugal pump failure form and troubleshooting: Failure form of the causes of the problem Remedy Pump not pump Reverse pump liquid into the pipeline leakage Pump cavity too little Suction too high At the end of the valve Leakage impeller impeded Do not change the motor wiring to prevent leakage increased Reservoir volume reduction Pump installation location Clean-up Bottom valve Wash pump housing Insufficient flow in impeller Inlet diameter too small Impeller flow path blocked High in suction Suction line leaked into air impeller Damaged exchange Sump wash Impeller open Large liquid valve Stop leak Gas replacement impeller head too low flow too too low speed too low off the valve to recover the rated speed low noise noise in the pump rotating parts and fasteners rubbing the shaft serious wear and tear check and adjust the clearance adjustment replacement pump shaft leakage pump housing fixing screws Loose Mechanical seal Severely worn Tighten the screw Replace the mechanical seal