Failure

Causes

Remedy

The pump does not suck in water. The hands of the pressure gauge and the vacuum gauge vibrate violently.

The pump priming is not sufficient. There is an air leak in pipeline or instruments.

Prime the pump again. Eliminate the air leak by tightening or plugging.

The pump does not suck in water. The vacuum gauge shows high vacuum valves.

The foot valve has not been opened or is blocked up. The resistance of the suction pipeline is too large or the water level at the suction side is too low.

Adjust or replace the foot-valve. Clean or change the suction pipeline. Raise the suction water level

The pressure exists at the discharge nozzle, but no water is delivered.

The resistance of the discharge pipeline is too high. The motor rotation direction is wrong. The impeller is blocked up. The pump speed is not sufficient.

Check or shorten the discharge pipeline. Check and correct the motor rotation direction.Clean the impeller. Increase the pump speed.

The capacity is less than the expected valve.

The pump is blocked up. The wear ring is worn off too much. The speed is not sufficient.

Clean the pump and the pipelines. Replace the wear ring. Increase the pump speed.

The power consumption of the power is too high.

The packing in the stuffing box is pressed too tightly and heated by friction. The impeller is worn out. The capacity is too high and the pump is overloaded.

Adjust the packing or replace it with a new one. Replace the impeller. Reduce the capacity by means of increasing the resistant in the discharge pipeline.

The pump produces abnormal noise and does not suck water.

The capacity is too large and the pump is overloaded. The resistant in the suction pipeline is too large. The suction height is too high. Air pocket exists at the pump suction portion. The temperature of the pumped liquid is too high.

Reduce the capacity by means of increasing the resistance in the discharge pipeline. Check the resistance in the suction pipeline. Check the foot valve. Reduce the suction height. Eliminate the air leak by tightening and plugging. Lower the pumped liquid temperature.

The pump vibrates.

The pump shaft and the motor shaft are not aligned properly or the pump shaft is slant

Adjust the alignment of the pump shaft and the motor shaft in accordance with the requirement.

The bearings are overheated.

Leak of oil. The pump and motor shafts are not aligned properly. The oil ring does not rotate.

Fill in the bearing housing with oil.Adjust the alignment of the shafts.Check and clean the bearing housing.