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液压油在液压系统中不仅传递动力或进行控制,而且具有对液压装置各部分的润滑、防锈及冷却的作用。因此,液压油将直接或间接关系到系统的可靠性、元件寿命等。然而,油在长期使用过程中由于种种原因,油与空气、水汽或水的接触必然要被污染。据有关资料统计,液压传动系统有60～70％左右的事故是因传动介质被污染所引起的,对于高精度的伺服控制系统比例还会大得多。所以,有人断言:
Hydraulic oil in the hydraulic system not only delivers power or control, but also has the various parts of the hydraulic lubrication, rust and cooling effect. Therefore, the hydraulic oil will be directly or indirectly related to the system reliability, component life and so on. However, the oil in the long-term use due to various reasons, oil and air, water vapor or water contact must be contaminated. According to statistics, about 60 ~ 70% of the hydraulic transmission system is caused due to pollution caused by the transmission medium, the proportion of high-precision servo control system will be much larger. So, someone asserted: