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1. Why isn’t water coming out of the pump? Reasons: Insufficient water being injected into the pump, incorrect rotation direction, blockage in the impeller’s flow channels. Solutions: Inject more water into the pump, clear the flow channels in the impeller, and correct the rotation direction. 2. What to do if the pump has insufficient flow rate? Reasons: Partial blockage in the pump, too low rotation speed, total head higher than the pump’s rated value, damaged impeller. Solutions: Clean the pump and pipes, replace the impeller, increase the rotation speed of the pump shaft, and adjust the outlet valve. 3. Reasons for insufficient outlet pressure and solutions. Reasons: Air in the liquid, too low rotation speed, damaged impeller, outlet valve opened too wide. Solutions: Remove air from the liquid, increase the pump’s rotation speed, replace the impeller, and reduce the opening of the outlet valve. 4. How to address excessive power consumption by the pump (motor overheating)? Reason: Mechanical defects such as excessive operating clearance, bent motor shafts, loose bolts, etc., or the pump operating at too high a flow rate – that is, operating at a pressure far below its rated value. Solutions: Inspect the mechanical components and make necessary adjustments; adjust the outlet valve so that the pump operates at near its rated flow rate and pressure. 5. Why does the water pump vibrate? How to solve the cover issue? Reason: The piping system is not properly supported; blockages in the impeller cause imbalance, leading to cavitation and the presence of air in the liquid. Solution: Check the support components, tighten the nuts, ensure the impeller is balanced, and remove any air from the system. 6. Why does the water pump leak? Reason: Damaged mechanical seal, damaged O-rings, leakage in the pump body. Solution: Replace the mechanical seal and O-rings, and weld up the areas where there is leakage in the pump body. 7. Reasons for excessive noise in the water pump and solutions. Reason: Overheating of bearings due to lack of oil, or excessive load on the water pump. Solutions: Apply oil to the bearings; follow solution No. 4. Problems with stainless steel centrifugal pumps