The phenomenon of suction is one of the main reasons for the excessive noise of hydraulic pumps. When the oil is mixed with air, it is easy to form cavitation in the high-pressure area and spread in the form of pressure waves, forming oil oscillations, causing cavitation noise in the system. Liugong excavator parts are mainly due to it.

    1. The oil filter, the oil inlet pipe of the hydraulic pump is blocked or the oil viscosity is too high, which can cause the vacuum at the oil inlet of the pump to be too high and allow air to enter.

    2. The oil seal of the shaft end of the hydraulic pump and the pilot pump is damaged, or the oil inlet pipe is not well sealed, causing air to enter.

    3. The oil level of the oil tank is too low, so that the oil inlet pipe of the hydraulic pump is directly emptied. When high noise occurs during the work of the hydraulic pump, the above-mentioned parts should be checked first, and the problems should be dealt with in time.

    Excessive wear and tear of internal components of the hydraulic pump, such as the wear and tear of the piston pump cylinder and the valve plate, the plunger and the plunger hole, etc., make the internal leakage of the hydraulic pump severe. When the hydraulic pump outputs high pressure and small flow oil At this time, flow pulsation will occur, causing higher noise. At this moment, the deflection angle of the variable mechanism of the pilot system can be appropriately increased to improve the influence of internal leakage on the output flow of the pump.

　The valve plate of the hydraulic pump is also one of the important components that easily cause noise. During operation, due to surface wear or sludge deposits on the opening of the unloading groove, the distribution plate will shorten the unloading groove and change the unloading position, causing oil trapping, and then causing higher noise.

　LiuGong excavator accessories feel that in the normal repair process, the valve plate corrected by flat grinding will also have the consequence of shortening the unloading groove. At this moment, if it is not properly slender in time, loud noise will also occur.

　During the installation process, the large unloading groove of the valve plate must be installed in the high-pressure chamber of the pump, and its sharp angle must be opposite to the rotation direction of the cylinder, otherwise it will also bring a lot of noise to the system.

For more information on excavator accessories, please visit Chuanna Industrial (cshailikj.cn). I hope this article "Liugong Excavator Accessories Explains the Causes of Excavator Hydraulic Pump Noise" will be helpful to everyone. If you still don’t understand, you can directly leave a message or consult Chuanna Hydraulics National Service Hotline 15850333149, we will solve your doubts as soon as possible!