Centrifugal pumps are used to transport water or other liquids. They have high efficiency and can be directly connected to high-speed motors. They are simple in structure, light in weight, easy to adjust, and widely used in industrial and agricultural production and daily life. . Centrifugal pumps may cause various failures during operation. Now, the possible causes of failures and treatment methods will be separately described as follows. First, the water pump does not emit water at startup. No water fill or no water before start. Stop the pump and fill the water again. 2. If the water absorption height is too large p, the water absorption height should be reduced so that it does not exceed 6 meters. 3. If the suction pipe leaks or bubbles, check the suction pipe to eliminate the leak. 4. The faucet is blocked and the faucet should be cleaned. 5. The number of revolutions is too low and check the power condition. Second, after the start, the pump discharge is very small. The impeller inlet is blocked by debris, the impeller is damaged or blocked; check the first section of the pump, remove debris or replace the impeller. 2. The tap is partially blocked; check for cleanup. 3. Suction lines are not tightly connected; check joints, tighten or replace pads. 4. The ribs of the impeller are worn and the ring seal ring wears too much. After inspection, replace the ring seal. 5. Pan leaks; replace cartridges. Third, the tap suddenly fell out of water Faucet surfaced; stop pump. 2. The faucet is blocked; stop pump cleaning. Fourth, the motor current is too large Drain gate is closed at start-up; take care when starting. 2. Balanced ring plate tilted too much or parts stuck; check the inside, fix the abnormal part. 3. The rotating part is not adjusted correctly, and the string is moved in the direction of water absorption, so that the impeller is against the mouth ring; the impeller rotor is pushed to the vertex of the inlet side first, and the inspection should be based on the engraved line. 4. The wheel is not properly engaged or the apron is too tight; corrective treatment. V. Excessive water discharge from running water pipes. Balance disk tail sleeve and string water jacket gap expansion; inspection processing, if necessary, replace one of the parts. 2. The assembly of the rubber balance ring is not proper, it is not pressed by the bracket or the tightening ring, no rubber rope is added under the tightening circle, the bracket is removed, and the balance ring is reassembled. Sixth, the pump has vibration during operation. The water pump and motor center are not good; check and adjust. 2. The water pipe is not fixed properly; check the adjustment. 3. Bracket bearing clearance; check adjustment. 4. Shaft bending; overhaul, replace the new shaft. 5. Impeller or balance plate skew; overhaul. 6. The anchor screw is loose and the foundation is not tight; tighten the anchor bolt or study to solve the basic problem. Seventh, bearing heat 1. The oil is not clean or has insufficient oil; clean bearings, change oil or refuel. 2. The oil ring does not turn or is not flexible; check processing. 3. The bearing gap is too small; adjust properly (padded or scraped). VIII. The disk is too tight or not soaked in the heating plate; it is readjusted or replaced. Nine, the balance plate is too hot or the valve on the pipe is not open; clean or open the valve. Ten, pump shell heating In the case of the gate closed or no water, the pump working time is too long; stop the pump cooling, and then start to pay attention. In addition, during the operation of the pump, there will be motor failures, which will not be described here.