The main reason why hydraulic oil is the most likely to contaminate the hydraulic system

January 28, 2023

In recent years, many manufacturers have carried out many useful explorations and practices on how to reduce or eliminate pollutants entering the fuel tank in the design of the fuel tank structure of the hydraulic system. For example, the fully enclosed fuel tank structure currently used, except for leaving only one gas-passing vent, the fuel tanks of the hydraulic system are all closed, and all joints and joints are provided with strict sealing. The fuel filler cap is provided with a filtering device to form a vent hole, and the hydraulic system allows the liquid level in the oil tank to communicate with the atmosphere, thereby ensuring the normal operation of the hydraulic system and preventing external pollutants from entering the fuel tank. Since the hydraulic system fuel tank is completely sealed, the filter is eliminated at the suction port of the pump, and all the oil return of the hydraulic system passes through the filter on the total return line and returns to the fuel tank, thereby ensuring the cleanness of the entire hydraulic system. This structure not only avoids the contamination of the oil in the fuel tank by external dirt. Moreover, since the oil suction port is removed from the filtering device, the oil absorption resistance is greatly reduced, thereby avoiding the occurrence of cavitation.

The failure rate of the hydraulic system is more than 75% due to the contamination of the hydraulic oil. In the hydraulic system, the place where oil pollution is directly caused by direct economic loss is the fuel tank. Many fuel tanks in hydraulic systems have drawbacks in structural design and manufacturing. The most common is that the "closed" fuel tank is not designed properly, for example, there is no seal at the joint and the joint, causing dirt to seep into the tank. Contaminated oil enters the hydraulic system, accelerating the wear, rust, and blockage of the hydraulic components, which ultimately leads to the formation of faults.

When we went to the hydraulic equipment of a shoe-making enterprise to deal with the failure of the pressure of the hydraulic system, it was found that the oil in the oil tank in the field had been stratified, and there was a clear gel in the hydraulic pressure below 200 mm. There are a lot of granular deposits at the bottom of the fuel tank. When the filter of the hydraulic pump is removed, almost all of it is blocked and the fuel tank is cleaned, and the problem is solved satisfactorily. Therefore, when using hydraulic oil, it should be viewed as human blood, and sufficient cleanliness should be maintained to ensure that the failure rate of the hydraulic system is minimized.

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