Hydraulic excavators generally need to replace hydraulic oil after 2000 hours of operation,

　　otherwise the system will be polluted and cause hydraulic system failure. According to statistics, about 90% of hydraulic system failures are caused by system pollution.

　　In fact, there are many serious problems such as hydraulic pump wear and hydraulic component jamming caused by hydraulic oil replacement problems, and once the hydraulic components are damaged, the loss is not just money!

　　The color of the hydraulic oil turns black, most likely due to the back and forth operation of the distribution valve spool and the back and forth operation of the hydraulic cylinder. Wear, but this phenomenon will not occur in a short time. If it is not maintained for a long time, it will turn black and finally affect the hydraulic components.

　　Hydraulic oil is the hydraulic medium used in the hydraulic system that uses liquid pressure energy. It plays the role of energy transfer, anti-wear, system lubrication, anti-corrosion, anti-rust, cooling, etc. in the hydraulic system. For hydraulic oil, first of all, it should meet the requirements of the hydraulic device for liquid viscosity at the working temperature and starting temperature. Since the viscosity change of the lubricating oil is directly related to the hydraulic action, transmission efficiency and transmission accuracy, it is also required that the viscosity-temperature performance and shear stability of the oil should meet the various requirements put forward by different uses.

　　After the hydraulic oil has been used for a long time, the viscosity will increase, causing the small crane to move slower and the amount of energy consumption to increase. It will cause the hydraulic components to rust and get stuck, causing them to not work properly.

　　The price of hydraulic oil on the market is about 2,000 per barrel. If you use new oil every time to replace it, the cost will increase a lot. If you pour out the hydraulic oil at will, it will also pollute the environment. The hydraulic oil filter in the excavator also needs to be replaced due to long-term filtration and the cost is also high.