1. The pump does not turn when starting. Cause: The packing is too tight or the impeller and the pump body are stuck by the debris; the pump shaft, the bearing and the leakage ring are rusted; the pump shaft is severely bent. Remedy: Dissipate the packing and clear the drain: Disassemble the pump to remove debris or rust; correct the bent shaft or replace the pump shaft.
2. After the start, the pump does not discharge water: there is air or water in the pump; the bottom valve is not tightly filled with water, the vacuum pump packing is seriously leaked; the gate valve or the door is not closed. Remedy: remove debris, replace the damaged rubber mat, change the direction of the valve; press or replace the new filler, close the gate valve or flap the door; increase the amount of irrigation until the venting plug does not bubble; replace Cracked pipe water; reduce the lift and press the nozzle of the pump into the water 0.5 m.
3. Insufficient flow: The actual lift of the pump exceeds the allowable lift; the speed is not matched or the belt is slipping, the speed is low; the installation angle of the axial pump blade is too small; the suction stroke is too high; the bottom valve, pipeline and impeller are partially blocked or the impeller is damaged. The water outlet leaks seriously. Remedy: reduce the lift, restore the rated speed, remove the belt dirt and adjust the belt tightness; adjust the blade angle to reduce the pump installation position; tighten the gland, seal the water pump leakage, press the packing or replace the packing; remove the blockage, Replace the impeller; replace the leak ring and block the leak.
4. The flow rate is changed from large to small. The reason is that the filter or the bell mouth is gradually blocked by the sundries; the water level is lowered, and the water inlet is submerged. Remedy: Remove debris and increase the depth of the bottom valve.
5. Reasons for interruption of water discharge during operation: There is debris in the pipeline or water inlet; the filler is worn, loose, and the water seal is blocked; the impeller is broken or loose; the water level drops sharply. Remedy: remove the blockage, replace the packing, clear the groove of the water pipe, install the water seal ring correctly; tighten or replace the impeller; lower the installation position of the water pump, or turn the water on after the water level rises.
6. Power consumption is too large Cause: The speed is too high; the pump shaft is bent; the blade is surrounded by debris; the lift is too high. Remedy: Adjust the appropriate speed; calibrate the pump shaft; remove debris; try to lower the lift.