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I. If the slurry pump will not start, the power supply should be checked first: ensure that the connections are secure； Are the switch contacts tight? ； Is the fuse blown? ； Check whether there is a phase imbalance in the three-phase power supply. In the event of an open circuit, poor contact, blown fuse, or missing phase, the cause should be identified and repaired promptly. Next, check for mechanical faults in the water pump itself. Common causes include: the packing being too tight, or debris getting stuck between the impeller and the pump casing, thereby causing a blockage ； The pump shaft, bearings, and leak reduction rings are rusted ； Severe bending of the pump shaft, etc. Exclusion method: Relax the filler and clear the water guide channel ； Disassemble the pump body to remove debris and rust ； Remove the pump shaft to correct it or replace it with a new one. II. Insufficient flow in the slurry pump: If the impeller or the inlet/outlet pipes are blocked, cleaning the impeller or the pipes can be done. If the impeller is severely worn, it should be replaced. If air leaks from the packing port, the packing should be tightened. The power speed of the slurry pump is not appropriate, or the belt is slipping, resulting in a low speed ； The installation angle of the axial flow pump blades is too small ； Insufficient head, too long piping, or straight bends in the piping ； The suction lift is too high ； Local blockage of the bottom valve, pipelines, and impeller, or damage to the impeller ； The water outlet pipe is leaking severely. Exclusion methods: Restore the rated speed, remove oil deposits from the belt, and adjust the belt tension properly ； Adjust the blade angle, lower the installation height of the water pump, shorten the pipes or change their curvature ； Seal the leak in the water pump by compressing the packing ； Remove the blockage and replace the impeller ； Replace the leak-reducing ring to seal the leak. III. Pump vibration and noise are mainly caused by the following 5 reasons: ① Uneven medium density. Uneven medium density causes vibration when the pump is first started; once the pump operates normally, this vibration disappears. No action is required in such cases, but it is important to use high-pressure air to even out the medium before starting the pump. ② The pump is not installed level. The level of the pump body should be checked during installation and operation. ③Cavitation occurs, causing the pump impeller to become unbalanced. The installation height should be reduced, the outlet valve should be adjusted to a smaller setting, in order to decrease the inlet resistance. ④The air intake through the suction pipe is uneven. The feeding condition of the pump should be improved to enhance the uniformity and stability of the incoming air. ⑤The pump bearing has a large clearance. Excessive bearing clearance can cause significant vibration in the pump. During routine operation of the equipment, it is necessary to constantly monitor the pump’s condition; if misalignment between the pump shaft and the motor shaft or damage to the bearings is detected, it should be addressed promptly.