Liugong Excavator Parts Explanation: Reasons for Hydraulic Pump Noise in Excavators

2025-05-02

The phenomenon of suction is one of the main reasons for the high noise of hydraulic pumps. When air is mixed into the oil, it is easy to form cavitation in its high-pressure zone and propagate in the form of pressure waves, causing oil oscillation and resulting in cavitation noise in the system. The main reason for the parts of Liugong excavator is believed to be.

1. If the oil filter or inlet pipe of the hydraulic pump is blocked or the oil viscosity is too high, it can cause a high vacuum degree at the pump inlet, allowing air to enter.

2. The oil seal at the shaft end of the hydraulic pump or pilot pump is damaged, or the inlet pipe is poorly sealed, causing air to enter.

3. The oil level in the tank is too low, causing the hydraulic pump's inlet pipe to be directly emptied. When there is high noise during the operation of the hydraulic pump, the above-mentioned parts should be inspected first, and problems should be promptly dealt with.

Excessive wear of internal components of hydraulic pumps, such as the cylinder body and distribution plate, plunger and plunger hole of plunger pumps, and other cooperative parts, can cause severe leakage inside the hydraulic pump. When the hydraulic pump outputs high-pressure and low flow oil, flow pulsation will occur, causing high noise. At this moment, the deviation angle of the variable mechanism of the pilot system can be appropriately increased to improve the impact of internal leakage on the pump output flow rate.

The distribution plate of a hydraulic pump is also one of the important components that can easily cause noise. The wear and tear on the surface of the distribution plate or the deposition of oil sludge in the open area of the unloading groove during use can shorten the unloading groove and change the unloading direction, resulting in trapped oil and causing high noise.

Liugong excavator parts feel that during the normal repair process, the distribution plate corrected by flat grinding may also have the consequence of a shorter unloading groove. If it is not appropriately elongated in a timely manner, significant noise will also occur.

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

More information about excavator accessories can be found on Chuanna Industry (www.kscna. cn). We hope that this article "Liugong Excavator Accessories Explanation of the Reasons for Excavator Hydraulic Pump Noise" will be helpful to everyone. If you still have any questions, please feel free to leave a message or consult Chuanna Hydraulic's national service hotline at 15850333149. We will answer your questions as soon as possible!