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Abnormal noise in the piston pump may be caused by the following reasons: 1. Insufficient or contaminated hydraulic oil: Insufficient hydraulic oil will cause air pockets in the pump, resulting in noise. Contaminated hydraulic oil can block the oil circuit or damage the internal parts of the pump, and can also cause abnormal noise. 2. Pump wear or damage: Long-term use or excessive use will cause the internal parts of the pump to wear, such as bearings, gears or plungers, etc., which may cause abnormal noise. 3. Air entering the system: Air entering the hydraulic system will produce bubbles. When the bubbles burst in the pump, noise will be produced. 4. Overload or excessive pressure: When the pump is operated under overload or excessive pressure, it may make abnormal sounds. 5. Improper installation: The pump is not installed firmly or the connecting pipes are loose, which may also cause abnormal noise. 6. Foreign matter entering: Foreign matter entering the pump, such as metal fragments, dust, etc., may cause internal damage and abnormal noise of the pump. 7. Pump quality issues: Low-quality pumps or manufacturing defects may cause abnormal noise problems. To solve the problem of abnormal noise in the hydraulic pump, the following measures can be taken: 1. Check the level and quality of the hydraulic oil to ensure that the oil is sufficient and clean. If necessary, replace the hydraulic oil. 2. Check the internal parts of the pump, such as bearings, gears, and plungers, and repair or replace them if they are worn or damaged. 3. To eliminate the air in the system, you can exhaust it through the exhaust valve. 4. Make sure the load and working pressure of the pump are within the normal range. 5. Check the installation of the pump to ensure that the connections are tight and not loose. 6. Prevent foreign matter from entering the system and clean and maintain the hydraulic system regularly. 7. If there are quality problems with the pump, consider replacing it with a reliable hydraulic pump. If the above measures cannot solve the problem, it is recommended to consult a professional hydraulic technician for further diagnosis and repair. Pls Contact 0086 0551-63360905