Hydraulic excavators generally need to replace the hydraulic oil after 2000 hours of operation, otherwise it will pollute the system and cause system failures. According to statistics, about 90% of hydraulic system failures are caused by system pollution.

In addition to checking the color, viscosity, and odor of the oil, the oil pressure and air humidity should also be checked. If you work in a higher altitude and lower temperature environment, you must also pay close attention to the carbon content, colloids (olefins) and sulfides in the engine oil, as well as the impurities, paraffin and moisture content in the diesel.

In special circumstances, if the machine uses low-grade diesel oil (the sulfur content in the diesel oil is 0.5%～1.0%), the diesel filter and the machine filter should be replaced every 150h; the diesel filter and the machine filter should be replaced every 60h if the sulfur content is above 1.0%. Machine filter. Use crushers, vibratory rammers and other equipment that has a heavy load on the hydraulic system. The replacement time of the hydraulic return filter element, pilot filter element and respirator filter element is every 100h.

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