With the increasing number of agricultural vehicles in China, small tractors and agricultural vehicles have become popular, but many farmers know little about the technical knowledge of the use of fuel for agricultural vehicles . In order to allow more people to understand and master this knowledge, the following five technical materials for the selection of agricultural vehicles are listed below for reference only. 1. Diesel Diesel is the main fuel of the tractor. According to its different freezing point, it is divided into two kinds: heavy diesel oil and light diesel oil. Generally, high-speed diesel engines for agricultural use mostly use light diesel oil. Heavy diesel has +20 (also called agricultural diesel). There are five types of light diesel: +10, 0, 10, 20, and 35. The number indicates the temperature of the freezing point (for convenience, the plus sign “+†indicating that the specified freezing point is above zero degrees Celsius, and the freezing point at or below zero degrees Celsius shall be unsigned. For example, “negative number 10†is marked as “number 10â€. "," does not add "negative" in front of it, and "itl0 number", it is recorded as "+10"). The price of oil is "positive sign" oil is cheaper than "negative sign" oil. The larger the negative number, the higher the price. The larger the positive number, the cheaper the price. Therefore, diesel must be reasonably selected. In general, the +20 agricultural diesel can be used in summer. In winter, diesel No. 10, No. 20 or No. 35 can be used depending on the temperature. 2. Oil The engine oil is divided into diesel engine oil and vehicle oil (also called gasoline engine oil). The diesel engine oil is divided into three grades of No. 8, No. 11 and No. 14 according to the viscosity. The higher the number, the greater the viscosity. Generally used in the summer of the larger viscosity of No. 11 or No. 14 engine oil. Use less viscous oil on the 8th in winter. Note: Do not use vegetable oil as oil, otherwise it will cause serious damage. The oil change period of the tractor is generally stipulated in the manufacturer's instruction manual. However, according to the experience of use, it is better to perform oil quality identification before the oil change, so as to avoid premature oil change, resulting in waste, too late, and increase part wear. The identification method is as follows. 1 Observe the changes in both the new oil and the required oil on the white filter paper. If there are more black spots in the oil droplets that need to be changed, it indicates that the engine oil has not deteriorated and can continue to be used; if the engine oil is dark brown and uniform with no black spots, it indicates that the engine oil has deteriorated and should be replaced. 2 Using two glass tubes with a diameter of 5 mm and a length of 200 mm, send a new 190 mm engine oil and oil to be replaced. After sealing the mouth, both tubes are inverted at the same time. Record the rising time of the bubbles. If the difference between the two exceeds 20%, it means that the viscosity of the oil to be changed has decreased too much. The new oil should be replaced (the above two methods can be used for reference). 3. Gear Oil Gear oil is used to lubricate tractors (automobiles) with heavy-duty gears and bearings. Gear oils are available in sizes 30 and 20. In the summer, use the 20th gear oil, the viscosity is small (freezing point of the 20th gear oil is not higher than minus 20 °C. Note: It is not allowed to mix the diesel oil or kerosene in the gear oil to reduce the viscosity, which will destroy the lubricating performance of the gear, increasing Gear wear. 4. Grease (butter) Grease is also called butter. Greases are classified into calcium-based greases (insoluble in water, low in melting temperature), sodium-based greases (soluble in water, higher in melting temperature), and calcium-sodium-based greases ( The performance is between the calcium-based grease and the sodium-based grease, which has both a certain heat resistance and a certain water resistance). In addition to generators using sodium-based grease, hand-held tractors generally use calcium-based grease, which is divided into five grades 1, 2, 3, 4, and 5. The larger the number, the harder the grease and the better the heat resistance. some. Therefore, when the number is selected, the higher number is generally used in summer and when the working temperature is high and the load is large. In winter and low working hours, lower numbers are used. 5. gasoline Gasoline is divided into three categories: gasoline for motor vehicles (for gasoline engines), gasoline for solvent (for industrial solvents and washing machines), and aviation gasoline. Gasoline is divided into 66, 70, 80, and 90 by octane number. The higher the number, the greater the anti-knocking ability and the smoother the engine's work, but the price is higher. Gasoline 70 is generally used on agricultural small gasoline engines. Note: In order to improve the anti-knock performance of gasoline engines, anti-knock agents (tetraethyl lead) are often added to vehicle gasoline. It is pinkish in color, toxic, and should be used with care. Do not inhale respiratory organs and immerse in skin. 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Agricultural Vehicle Lubrication: Selection of Fuel for Agricultural Vehicles