Air is everywhere, and when it sneaks into the hydraulic oil in the servo hydraulic system, it can be divided into the following situations:
1, during the refueling process, the hydraulic system is improperly dumped downward, resulting in bubbles mixed into the oil and brought into the pipeline;
2, the auxiliary joint of the hydraulic system is loose or the oil seal is damaged, and the air is inhaled;
3, the suction pipe is worn, bruised or corroded, so air enters.
In addition to overheating, a considerable part of the air will dissolve in the oil under pressure and enter the air from the oil of the hydraulic system. If some of the compressed volume is dissolved air, foam forms when the pressure falls. When the working hydraulic cylinder depressurizes and returns oil, the hydraulic oil in the foam hydraulic system will form a "sponge" property. In addition, the many foams contained in the oil can increase the overall volume, which can cause the tank or reservoir to overflow.
The air-rich hydraulic oil will have a "spasm" phenomenon during each power transmission, and the power transmission is quite uneven. The resulting pressure wobbles and stresses will inevitably damage the parts. In increasingly severe cases, the entire hydraulic system may be damaged, and there is also a risk that the hydraulic pump will produce air pockets, resulting in greater suction, and therefore more air or impurities in the air will be brought into the hydraulic system. Due to the oil into the air caused by overheating, the air will bring dust, which will make the oil change rapidly.
