First, the broken axis. It is the most common failure of deep well pumps. In the upper and lower parts of the entire pump body, are likely to occur, the main reasons are: 1. Well tube not straight and cause pump shaft, pump tube tilt, the pump tube bending, increasing the radial load generated by the pump shaft Broken shaft, or even a pipe destruction. Solution: dig the channel, increase the caliper; check the wall is damaged. 2. Start-up does not meet the operating rules and broken shaft occurred. Long-term deep pump such as not to use, 3 to 4 times a month by hand the belt rotation a few times. Otherwise it will make all parts bearings (including rubber bearings and graphite bearings, etc.) and the pump shaft, shaft and impeller diversion casing serious corrosion. If started in this condition, a broken shaft will occur. The solution: Operators only need to follow the rules before starting the drive with a wrench wheel a few times, check the transmission without exception. Such as rotation is not light, pump tube can be injected into the amount of water lubricated rubber bearing. Rotation is still not light, and then into the soapy water; start deep well pump, stop immediately after the restart. Such as eager to start, full of water due to the resistance of the pump tube is prone to broken shaft, pump and other water must be fully discharged before starting. Second, pump tube loose. In addition to the reasons for the quality of this phenomenon, the main are: 1. Well tube is not straight, the wall is not smooth. Workover solution; 2. Couplings (sets) do not mind. Correctly adjusted according to the requirements can be solved; 3 due to improper fastening, to deal with a good buckle, the correct fastening; 4 water shut down after the shutdown effect reversing shaft, resulting in loose threaded. With slow down after the tube in the water reflux rate method to solve. Third, the vibration of the pump work overrun. Corrective measures: 1. Correction drive shaft, replace worn excessive bearings. 2. Adjust the axial clearance to solve the impeller work part of the upper or lower. 3. Workover or use a small diameter of the deep water pump to solve the phenomenon of non-vertical well tube. 4. Correct installation should be required. Fourth, the pump flow to reduce efficiency. The reason: 1. The axial clearance is too large, so that the impeller is not working properly. Should adjust the axial clearance. 2. impeller, diversion shell cavitation or wear serious, new parts should be replaced. 3. Loosen the impeller, sliding key, should improve the assembly method. 4. Blocked suction pipe, there are debris on the impeller, between the diversion debris, should be cleaned. 5 did not reach the rated number of revolutions, mainly belt slip, pulley match unreasonable. The belt should be tight and appropriate, should not be too loose operation, and timely belt of oil (wax). 6. Well pump is not complete, insufficient water, should match the rational deep well pump. 7. Feel free to increase the lift should be corrected according to the instructions.