Raise the liquid tank level closer to the pump.Ĭlean or replace broken or worn-out valves to ensure proper operation.Ĭorrect cause of thermal overload and reset the motor.Ĭheck for physical damage to motor, repair, or replace as needed. Inspect and repair pipeline or hose for leaks. Consult the manual for your hydraulic equipment for proper fluid levels. A rotor or impeller spinning in the wrong direction could damage the pump.Ĭlean out the strainer and ensure it is free from obstructions which could clog the suction inlet.Įnsure the pump motor is filled to proper hydraulic fluid levels. Inspect and replace packing if sufficiently worn.Įnsure the rotor is spinning in the correct direction by comparing it with the indicator on volute. If the rotor has been damaged, ensure it is repaired or replaced prior to powering on the pump. Open up the pump and volute casing to inspect the rotor for damages. Increase the lubricant pressure to exceed atmospheric pressure, effectively locking air out of the stuffing box.Ĭheck NPSHr and NPSHa, you may not have enough positive suction head for what is required. A gauge will indicate a leak with a drop of pressure. For such liquids as gasoline, the suction line can be tested by shutting off or plugging inlet and putting the line under pressure. If liquid pumped is water, test flanges for leakage with flame or match. Make sure the rotor is spinning in the correct direction when the pump is in operation.ĭisassemble the pump and volute to clear the rotor jam or clog. If the static lift is too high, you’ll need to lower the pump closer to the source material or raise the material closer to the pump.Ĭheck pipe friction losses, use larger discharge pipes.Įnsure the motor is receiving the required voltage and correct frequency if using a variable frequency drive.Ĭheck the motor rotation direction as indicated by arrows on the pump casing. If you suspect air in the pump, make sure to vent volute/casing to remove trapped air before resuming pumping.Ĭheck the pipeline for friction losses and ensure the static lift is not too high. If any air is trapped in the pump, it will not operate correctly.Ĭheck for leaks in the pump, pipeline, and couplings which could cause air to enter the pump. Ensure the pump and volute are completely full of liquid before operating the pump.
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