Because hydraulic transmission has the advantages of small component volume, light weight, stable transmission, reliable operation, convenient operation and easy to realize stepless speed change, hydraulic transmission is widely used in the transmission system of mining vehicles or equipment. Hydraulic oil is the hydraulic medium used in the hydraulic system using liquid pressure energy. It plays the role of energy transmission, system lubrication, anti-corrosion, rust prevention, cooling and so on.

正确选用液压油品种，确保矿山车辆液压系统长期平稳、运行，是保证连续生产、节省材料消耗和提高经济效益的有效措施。其主要作用表现为：

The correct selection of hydraulic oil varieties to ensure the long-term stable and safe operation of the hydraulic system of mining vehicles is an effective measure to ensure continuous production, save material consumption and improve economic benefits. Its main functions are as follows:

防腐：目前，金属零件特别是黑色金属零件是液压传动系统的主要零件。如果它们长期暴露在大气中，由于水和空气等有害物质的侵蚀而生锈，严重危害其使用性能。如果将金属零件等浸泡在液压油中，可使金属零件加工面与水和空气等有害物质隔离，从而减轻腐蚀，防止生锈。

Corrosion protection: at present, metal parts, especially ferrous metal parts, are the main parts of hydraulic transmission system. If they are exposed to the atmosphere for a long time, they will rust due to the erosion of harmful substances such as water and air, which will seriously endanger their service performance. If metal parts are immersed in hydraulic oil, the machined surface of metal parts can be isolated from harmful substances such as water and air, so as to reduce corrosion and prevent rust.

冷却：液压油具有良好的热传导性，能够及时带走摩擦偶合面所产生的摩擦热，并能及时冲洗摩擦偶合面所产生的磨屑等污物，从而达到降低摩擦偶合面的温度和减轻其磨损的效果。

Cooling: the hydraulic oil has good thermal conductivity, can timely take away the friction heat generated by the friction coupling surface, and can timely wash the dirt such as wear debris generated by the friction coupling surface, so as to reduce the temperature of the friction coupling surface and reduce its wear.