What are the causes of the fault noise of excavator plunger motor?

[BONOVO]

First, the suction phenomenon is one of the main reasons for the excessive noise of the hydraulic pump. When excessive air is mixed into the oil, it is easy to form a cavitation phenomenon in the high pressure area, and is transmitted by pressure wave, constituting oil oscillation, resulting in cavitation noise in the system. The reasons for the formation of hydraulic pump suction are:

1. The oil filter and inlet pipe of the hydraulic pump are blocked or the oil viscosity is too high, which constitutes the high vacuum at the oil inlet of the hydraulic pump and makes the air enter.

2. The hydraulic pump and pilot pump shaft end oil seal is damaged or the inlet pipe seal is poor to form air entry.

3. The oil level of the tank is too low, and the inlet pipe of the hydraulic pump is directly empty. When high noise occurs in the work of the hydraulic pump, the above parts should be viewed first and the problems should be dealt with in time.

Second, the oil distribution pan of the hydraulic pump is also one of the important components that is easy to cause noise. When the oil distribution tray is in use, due to external wear or oil mud deposition at the opening of the unloading tank, the unloading tank will become shorter, and the oil trapping phenomenon will occur due to the change of the unloading position, resulting in higher noise. In the normal repair process of the hydraulic excavator, the oil distribution pan corrected by flat grinding will also show the result of shorter unloading groove, and if it is not properly slender at this moment, it will also cause greater noise. In the installation process, the large unloading groove of the oil distribution disc must be installed in the high pressure chamber of the pump, and its sharp Angle direction is opposite to the rotation of the hydraulic cylinder, otherwise it will also bring greater noise to the system.

Third, excessive wear of the internal components of the hydraulic pump, such as the wear and strain of the cylinder and the oil distribution pan on the plunger pump, the plunger and the plunger hole and other mating parts, resulting in severe leakage in the hydraulic pump, which will cause flow pulsation when the hydraulic pump outputs high pressure and small flow oil, resulting in higher noise. At this moment, the deflection Angle of the variable organization of the pilot system can be properly increased to improve the influence of internal leakage on the output flow of the pump. The servo valve spool of the hydraulic pump and the piston that controls the flow rate will also pulsate during the moving process due to partial wear and strain, resulting in fluctuations in the output flow and pressure of the hydraulic pump, resulting in greater oscillation and noise at the pump outlet. At this moment, brush plating or replacement of components with severe wear and strain can be carried out.

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