In the process of using the water pump, it often affects the irrigation due to the failure. Now its common faults and exclusion methods are described as follows: 1. After the water pump starts, it does not produce water, and the water is insufficient or stops watering midway: 1 No water is poured into the pump or the water is not filled. The water pump should be filled with water or water in the pump should be filled with water. 2 The total working head or suction head of the pump exceeds the specified standard. Replace the high lift pump or reduce the pump position. 3 The pump speed is not enough or reversed. The pump speed should be increased to adjust the pump steering. 4 Pump impeller is clogged or worn. Should remove the plug on the impeller or replace the impeller. 5 Leak in suction line or pump packing. Tighten the suction line or press the pump packing. 6 Suction valve bottom valve is exposed to the water surface or the water depth is not enough. Should take a long suction pipe or reduce the pump position. 2. The power machine is stationary: The actual head and flow of the pump exceeds the specified range. Should adjust the head, flow, close the small valve, reduce the amount of water. 2 Small power and large water pump. Should reduce the pump speed or change the power engine. 3 bearing damage. Impeller and pump casing have serious friction. The bearings should be replaced, the wear of the impeller checked, and the impeller replaced if necessary. 4 The shaft of the water pump is bent or the axes of the machine and pump are not concentric. The water pump shaft or adjuster or pump coupling should be straightened to make it concentric. 3, the machine vibration, abnormal sound or bearing heat: 1 suction head exceeds the required standards or the bottom valve plug, should reduce the pump position or clear the block on the bottom valve. 2 There is a vortex in the suction tank and the air enters the pump. The water inlet depth should be increased to put a wooden frame on the water surface.