(1) Selection of diesel grades. Agricultural vehicles use light diesel oil as fuel, and are divided into five grades No. 10, No. 0, No. 10, No. 20 and No. 35 depending on the condensation point of light diesel oil. The choice of diesel grades is mainly based on the local temperature. In principle, the freezing point is required to be slightly lower than the minimum gas temperature. The specifications of diesel used in various diesel engines are basically the same. Summer (ambient temperature 10 °C above) use. No. Diesel, winter (ambient temperature below 0 °C) with -10 or -20 light diesel fuel. (2) Selection of lubricants. China's diesel engine lubricants are divided into five levels according to quality standards. Among them, agricultural vehicles are commonly used CC grade lubricants, and it is divided into 8 viscosity models such as 5W/30, 5W/40, 10W/30, l0W/40, 1:W/40, 20W/40, 30, 40 and so on. The higher the value, the greater the viscosity of the lubricant. Different grades of lubricants should be used depending on the season, region, and the technical state of the diesel engine. Under the premise of guaranteeing reliable lubrication, in order to make the engine effectively exert its efficiency, try to use low-grade lubricants. In summer, 40CC diesel oil can be used, and in winter, 30CC diesel oil can be used. For newly-manufactured diesel engines, the viscosity of the selected lubricant can be appropriately lower due to the smaller clearances of the moving parts. (3) Selection of grease. Grease (commonly known as butter) is classified into calcium-based grease, sodium-based grease, and calcium-sodium-based grease, depending on the type of thickener added. 1 Ca-based grease A thick ointment made of engine oil, animal and vegetable oils and lime, yellow. It has good water resistance and is suitable for lubrication of parts that come into contact with moisture or moisture. Because it uses water as a stabilizer, when the use temperature exceeds a predetermined value, it will lose water, so that the resulting structure of the grease is destroyed, so it is not resistant to high temperatures, and usually does not exceed 70 °C. Calcium-based grease is divided into five grades according to the degree of penetration, and its codenames are respectively ZG-1, ZG-2, ZG-3, ZG-4 and ZG-5. The bigger the number, the smaller the penetration and the harder the fat. No. 1 is suitable for low temperature working conditions; No. 2 is suitable for ball bearings with light load and no more than 55°C; No. 3 is suitable for medium-load, medium-speed and mechanical friction parts with temperature below 60°C; No. 4 and No. 5 No. is suitable for lubrication of heavy-duty, low-speed machines with temperatures below 70°C. The lubrication of cooling water pump bearings for medium and low-power diesel engines is best suited for injection of No. 4 calcium-based grease. 2 sodium grease. Made of a blend of oil and soap, the color varies from yellow to dark brown and even black. One of its characteristics is high temperature resistance, which is widely used in machines that work at high temperatures. Its other feature is its strong hydrophilicity, its dissolution after being dissolved and its failure, so it can not be used for water contact. Sodium-based grease is divided into ZN-2, ZN-3, and ZN-4 grades by penetration. No. 2 and No. 3 are suitable for friction parts with a temperature not higher than 115°C, but not for contact with water; No. 4 is suitable for friction parts with a temperature no higher than 135°C, and cannot be used for water or dampness. Parts. Generator bearings and clutch bearings must use sodium grease. 3 calcium sodium grease. Mixed soap grease, divided into two grades of ZGN-1 and ZGN-2. Its water resistance is stronger than that of sodium base grease, and its high temperature resistance is stronger than that of calcium base grease. Suitable for lubrication of bearings operating at high temperatures, with an upper operating temperature of 100 °C.
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