Hydraulic oil pump noise reasons:

1. The flow pulsation and pressure pulsation of hydraulic pump, would amount to a hydraulic pump parts of oscillation.If the root of the hydraulic pump frequency and resonant frequency synchronization with the natural frequency of hydraulic system, the noise will increase significantly.
2. The hydraulic pump operation, when the hydraulic pump oil absorption cavity suddenly and oil cavity pressure of the pressure oil cavity is same or suddenly and oil absorption cavity are interlinked, then the pressure will happen soon followed, appear this kind of phenomenon occurs when the noise is exceptionally large.
3. The sharp change in the oil pressure in the pump.When the hydraulic pump oil suction chamber pressure is less than the hydraulic oil in place under the temperature of the air separation pressure, dissolved in the hydraulic oil in the air will become a bubble.The hydraulic oil into the high-pressure chamber with air bubbles, bubbles will be break, then part of high frequency pressure shock, and noise.
4. Hydraulic oil pump the sudden enlargement and inner channel inside have shortened, when the channel area through the teenager will cause liquid turbulent flow, spiral flow, and then the noise will be increased.
   How to reduce the noise:
5. In a certain period of use rubber hose pressure tubing, connection of pump and pipeline vibration isolation.To make the hydraulic pump flow and pressure pulsation of the weakened, can be installed an accumulator in hydraulic pump outlet or a muffler.
6. Mounted on the tank of the hydraulic motor and hydraulic pump with a rubber mat mat below to reduce vibration, the connecting shaft of the hydraulic motor and hydraulic pump shaft, the alignment between them will be better.
7. Because of using mechanical reason also can attack the noise, such as mechanical shift some imbalance, poor and pump shaft bearing connection twists and turns of the oscillation will cause mechanical attacks such as noise.
8. Using larger diameter tubing absorption, to reduce the part of the pipeline resistance, prevent the onset of hydraulic cavitation;Using the large capacity of oil suction filter, to prevent the hydraulic oil blend in the air, a reasonable plan hydraulic pump, the rigidity of the moving parts, prevent or reduce the oscillation.