Pumps are the main irrigation and drainage machinery for rural domestic water and summer planting. In operation, it is inevitable failure and damage, so that normal pumping can not. Therefore, poor pumping of the pump must be repaired and adjusted to promptly troubleshoot. First, you can not start First, check the power supply situation: whether the connection is solid; whether the contact switch is tight; whether the fuse is blown; whether the three phase power supply is equal. If there is an open circuit, poor contact, the fuse blown, lack of phase, should identify the cause and timely repair. Second, check if it is a mechanical failure of the pump itself, common causes are: packing is too tight or clogged with debris between the impeller and the pump body; pump shaft, bearings, leak ring rust live; severe shaft bending and so on. Remedy: relax the filler, clear the diversion trough; open the pump body to remove debris, rust; remove the pump shaft to correct or replace the new pump shaft. Second, the matching power motor overheating for four reasons. First, the reasons for the power: high or low voltage, under a specific load, if the voltage range should be rated at + 10% to -5% outside the motor will cause overheating; power supply three-phase voltage asymmetry, power supply three Phase voltage phase imbalance of more than 5%, lead winding group overheating; lack of phase operation, the experience shows that agricultural motor is burned more than 85% due to lack of phase operation, the motor phase loss protection device installed. Second, the reasons for the pump: the choice of power does not support the cart pull the motor, the motor overloaded for a long time to run, so that the motor temperature is too high; start too often, the fixed short-term or intermittent work of the motor system continuous work. Should limit the number of starts, the correct choice of thermal protection, according to the rated motor on the use of fixed. Third, the reasons for the motor itself: the wrong connection, the △ wrongly connected into a Y-shaped, so that the motor temperature rose rapidly; stator windings have short-circuit between, turn short circuit or local grounding, light motor overheating, severe insulation Burn out; Broken squirrel cage rotor or defective, the motor running 1 to 2 hours, the core temperature rises rapidly; ventilation system failure, the fan should be checked for damage, rotation direction is correct, the ventilation hole is blocked; bearing wear, the rotor Eccentric sweep bore to make the rotor core rubbed metal percussion sound, the core temperature rose rapidly, the motor smoke in serious cases, and even the coil burned. Fourth, the reasons for the work environment: Motor winding damp or dust, oil and other attached to the winding, resulting in reduced insulation. Insulation resistance of the motor should be measured and cleaned, dried; Ambient temperature is too high. When the ambient temperature exceeds 35 ℃, the inlet air temperature is high, the motor temperature will be too high, should seek to improve its working environment. Such as scaffolding shade and so on. Note: due to electrical reasons for failure, should obtain a professional qualification certificate of electrician maintenance, illiterate people can not be blindly repaired to prevent personal injury accidents. Third, the pump heat causes: bearing damage; rolling bearing or bracket cover gap is too small; shaft bending or two axes are not heart; tape is too tight; lack of oil or oil quality is not good; impeller balance hole plug, impeller out of balance, Increased thrust to the side. Remedy: Replace the bearing; remove the back cover, install a gasket between the bracket and the bearing seat; investigate the pump shaft or adjust the concentricity of the two shafts; properly adjust the tightness of the tape; add clean butter and butter About 60% of the gap; clear the balance hole plug. Fourth, the lack of flow This is because: power speed is not complete or belt slippage, so that the speed is low; axial pump blade mounting angle is too small; lack of head, the pipe is too long or the pipe has a right-angle bend; Valve, pipe and impeller partial blockage or impeller defect; outlet pipe serious water leakage. Remedy: Restore the rated speed, remove the belt grease, adjust the belt tightness; adjust the blade angle, reduce the pump installation position, shorten the pipe or change the pipe curvature; seal the pump leak, compaction packing; clear blockage Change the impeller; replace the leak ring, plug the leak. Fifth, the suction is not due to the water pump is the body of air or gas intake pipe, or at the end of the valve is not strict irrigated water dissatisfaction, vacuum pump filling serious leaks, gate valve or shot closed lax. Remedy: First water pressure up, and then filled with water pump, and then boot. At the same time check the check valve is tight, piping, fittings leaks, such as found leakage, remove the joint at the joints coated with oil or paint, and tighten the screws. Check the pump shaft seal ring, such as serious wear and tear should be replaced with new pieces. Piping leaks or leaks. Nuts may not be tightened during installation. If the leakage is not serious, can be smeared in the place of leakage or leakage of cement, or coated with asphalt mixture of cement slurry. Temporary repair can be painted wet mud or soft soap. If the joint leaks, you can use a wrench to tighten the nut, if serious leakage must be re-disassembly, replacement of cracked pipe; reduce the head, the pump nozzle into the water 0.5m. Six, violent vibration mainly for the following reasons: electric rotor imbalance; coupling with poor; bearing wear and tear; rotating parts of the parts loose, broken; pipe stent is not strong and other reasons. Can be taken to adjust, repair, reinforcement, straightening, replacement and other methods. The above situation is a common cause of pump failure, not all of them. In practice, failure should be handled in a practical way.