When checking the oil level of hydraulic tank, we should also pay attention to the quality of oil. The environment of excavator construction site is bad. With the increase of working time, impurities and dirt are easily mixed in the oil. The contaminated hydraulic oil enters the fit gap of hydraulic pump, hydraulic motor and control valve, which will scratch and destroy the precision of the fit surface, increase the leakage and increase the oil temperature. If the hydraulic oil deteriorates and the viscosity temperature of the oil is poor, it is easy to produce emulsification and cavitation. In the high pressure region, the surface of the hydraulic element will produce local high temperature and aggravate the wear of the element.
According to the requirements of excavator maintenance, clean the magnetic core of hydraulic oil filter every day within 300 hours of mechanical initial work. When the machinery is maintained for 100 hours, the hydraulic oil radiator is cleaned by using compressed air to blow off the dust on the radiator, and the adhesion on the radiator is removed with wood, and the leakage should be welded. When the machinery is maintained every 300 hours, the hydraulic oil should be replaced, and the oil should be changed every 2000 hours, and the same grade hydraulic oil must be used for each replacement, and the specified oil level should be added. When the machinery is maintained three times every 900 hours, the hydraulic oil should be filtered. The method is to release all the hydraulic oil that works and turns to the hydraulic system while it is hot, and clean the oil tank and the filter screen in the box with the cleaning liquid.