2. It is difficult or impossible to start, accompanied by "buzzing" sound. During maintenance, you can use small bamboo pieces to move the blades quickly according to the running direction. If the motor runs fast, it means that the starting capacitor or the starting winding is damaged, and the capacitor with the same capacity should be replaced or the starting winding should be repaired. If the motor is stuck, it is mostly a mechanical failure of the motor and the pump head, such as damaged bearings and stuck impellers.
3. The motor can run, but the speed is slow, the shell is overheated, and it smells burnt. Most of them are caused by short circuit of motor windings. According to the damage, the motor should be repaired by disassembly, welding, bridging, isolation and rewinding.
4. Noise and vibration during operation. Most of them are damaged bearings or improper matching between bearings and casing, so the motor needs to be disassembled for inspection. If the bearing is damaged, it should be replaced. If the bearing runs out of the excircle, the mating surface of the pump shell can be chiseled; If the bearing runs in the ring, the worn part of the motor shaft can be treated with a chisel, and the seriously worn part can be repaired by surfacing first and then turning. 1. The motor in the pump head of the sprinkler works normally, but the water output is small or not at all. In this case, we should first check the seal of the sprinkler pump. When checking, unplug the power plug first, block the suction port by hand, fill the pump with water, hold the outlet with your mouth and blow hard into it to observe whether the pump head leaks. The leak is a broken seal. Common fault parts are water inlet pad, water outlet pad and impeller cover pad, which should be replaced during maintenance. If there is no phenomenon of full water, it is mostly the impeller damage, the water retaining wall between the suction chamber and the outlet chamber is corroded, the water retaining wall of the pump head is polished, and the gap between the impeller and the pump casing is increased. , the impeller and pump housing should be replaced. When replacing the impeller, attention should be paid to thoroughly remove the residual copper blades in the pump to avoid damaging the new impeller again.
2. The cartridge case is charged. Most of the water seals are damaged, and water penetrates into the motor through the motor shaft, which deteriorates the insulation performance of the motor. It can be repaired by replacing the water seal and drying the motor. It should be noted that because the pump is in contact with water for a long time and works in the open air, it is easy to get wet and the thermal insulation performance becomes worse. In order to ensure personal safety, the self-priming pump of electric sprinkler should be reliably grounded.