- Unable to Start: One of the most common faults is the inability of the water pump to start, which may be due to power supply issues such as loose connections, poor switch contact, blown fuses, or missing phases in three-phase power supply. Mechanical faults in the pump itself, such as overly tight packing, debris blocking the impeller and pump body, rusted pump shaft, bearings, or severe bending of the pump shaft, may also be the cause.
- Water Pump Overheating: Causes of overheating can include damaged bearings, insufficient clearance between the rolling bearings or cover, bent pump shafts or misaligned shafts, overly tight belts, insufficient or poor-quality oil, and blockages in the balance holes of the impeller.
- Insufficient Flow: Insufficient flow can be caused by mismatched power speed or slipping belts, insufficient angle of installation for axial flow pump blades, inadequate lift, excessively long piping or right-angle bends, high suction lift, blockages in the bottom valve, piping, or impeller, or severe leaks in the outlet pipe.
- Cannot Draw Water: This is usually due to air in the pump body or air accumulation in the intake pipe, poorly sealed bottom valve, insufficient priming, severe leakage in the packing of the vacuum pump, or poorly sealed gate valves or check valves.
- Severe Vibration: Causes of severe vibration can include unbalanced electric rotors, poor coupling connections, worn or bent bearings, loose or broken parts in the rotating section, and unstable piping supports.
- Tool Preparation: Basic tools needed for repairing water pumps include wrenches, screwdrivers, pliers, hammers, etc., for disassembling and installing various components of the pump. Testing tools such as multimeters and megohmmeters are also necessary to check the electrical and insulation performance of the pump.
- Safety Measures: Before repairing the water pump, ensure that the power supply is cut off to avoid electric shock accidents. Also, drain any water from the pump to prevent leaks during repair. If disassembling components like the impeller or bearings, take care to prevent parts from popping out and causing injury.
- Repair for Unable to Start: First, check the power supply to ensure connections are secure, switches are tight, fuses are intact, and there are no missing phases. Then check for mechanical faults, loosen packing, and clear the priming groove; disassemble the pump body to remove debris and rust; straighten or replace the pump shaft as needed.
- Repair for Water Pump Overheating: Check for any damage to the bearings and replace them if necessary; remove the rear cover and add shims between the bracket and bearing seat; adjust the alignment of the pump shaft or the two shafts; loosen the belt tension as needed; add clean grease; remove blockages from the balance holes.
- Repair for Insufficient Flow: Check the intake pipe and bottom valve for leaks; clear sludge or blockages at the intake; ensure the depth of the bottom valve is at least 1.5 times the diameter of the intake pipe; check the power supply voltage, increase pump speed, replace seals or impellers; lower the pump installation position or replace it with a high-lift pump.
- Repair for Cannot Draw Water: First, pressurize and fill the pump body with water before starting; check for leaks in the check valve and other components, replace worn oil seals, and address any leaks or air ingress in the piping; lower the lift by submerging the pipe opening 0.5 meters underwater.
- Repair for Severe Vibration: Use methods such as adjustment, repair, reinforcement, straightening, or replacement. This may include balancing the electric rotor, repairing the coupling, reinforcing the piping supports, and straightening or replacing bearings and parts of the rotating section.
- Check Sealing: After repairs are complete, check the sealing of the water pump. Inject a certain amount of water into the pump body and observe all interfaces and seals for leaks. If leaks are found, promptly identify and repair the cause.
- Check Electrical Performance: Use tools like multimeters and megohmmeters to check if the pump motor is functioning properly, including the motor’s resistance and insulation performance. Ensure that the motor’s electrical performance meets requirements to avoid failures during operation.
- Regular Maintenance: To extend the lifespan of the water pump and reduce faults, regular maintenance is necessary. This includes cleaning the exterior and interior of the pump to prevent dust and debris buildup. Regularly check for wear on various components such as the impeller and bearings, and replace them promptly if wear is detected.
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Question: What to do if the water pump makes a lot of noise during operation?
Answer: Check if the pump body and base are loose or unstable, tighten bolts or adjust the base; check if bearings are worn or need lubrication; if damaged or dry, replace or lubricate the bearings; clean or replace the impeller to ensure its surface is smooth. -
Question: How to handle water leakage from the pump?
Answer: Check if the sealing elements are aged or damaged; if there is leakage, replace the sealing elements; check if the connections and pipelines are tight to ensure there are no loose or leaking areas. -
Question: Why does the water pump motor suddenly trip the power supply?
Answer: This may be due to motor overload, excessive temperature rise, excessive operating current, or excessively high voltage of the power supply. -
Question: What to do if the water pump motor gets water in it?
Answer: Check if the waterproof cable is damaged, if the power line connections are sealed well, if the sealing structure at the motor’s inlet is damaged, if the mechanical seals are damaged, if the O-ring is damaged, and if the sealing bolts are tightened; repair or replace based on the specific issue. -
Question: How to solve the leakage phenomenon of the water pump motor?
Answer: Check if the waterproof cable is damaged, if the power line connections are sealed well, if the motor has water ingress, if the motor is burned out, and if the insulation resistance is too low; properly install the pump’s grounding and ideally install a leakage switch. -
Question: What are the reasons why the water pump motor cannot start?
Answer: It may be due to leakage, low voltage of the power supply, foreign objects jamming the impeller, damaged bearings, motor overload, incorrect phase connections in three-phase pumps, phase loss in three-phase motors, motor sweep, capacitor damage, incorrect connections, or insufficient capacity. -
Question: How to determine if the impeller of the water pump needs to be replaced?
Answer: Check for signs of damage, wear, or corrosion; if cavitation is light and the impeller is honeycombed, it can be repaired; if wear is severe, the impeller needs to be replaced. -
Question: How often should the bearings of the water pump be replaced?
Answer: Generally, this is determined by the bearing’s usage and the pump’s operating time; if bearings are found to be running roughly, stalling, or making unusual noises, or if wear exceeds specified limits, they should be replaced promptly. -
Question: Why does the water pump suddenly stop working during operation?
Answer: This may be due to power failure, motor failure, internal mechanical failure of the pump, or overload protection, which needs to be checked one by one. -
Question: How to prevent water pump failures?
Answer: Regularly inspect and maintain the pump, including cleaning, lubrication, and tightening; ensure proper installation to avoid instability or excessive height; choose suitable pumps and motors to avoid mismatched power; observe the pump’s operation during use to promptly identify and address issues.
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