The use of diesel precipitation after 48 hours has proved that the impurities in diesel fuel are mostly soil particles, lime sand, rock dust and tiny dust. The main components of these impurities are sulfo and bauxite. If diesel is not subjected to precipitation, filtration, and other purification processes, it is directly used in the fuel system. Even small impurities enter the plunger pair, outlet valve, and injector, and they will be at high pressure and high speed like abrasives. Grind the surface of precision parts and destroy their finish and fit. Over time, it will promote the deterioration of the engine combustion process, exhaust smoke, produce carbon deposition, promote engine oil aging, weakening the role of lubrication, thereby changing the state of the machine technology, affecting the engine work. Therefore, before diesel oil is added to the fuel tank, it is precipitated for at least 48 hours, so that most of the particulates in the diesel oil are deposited on the bottom layer. When diesel oil is used about 20 centimeters from the bottom of the barrel, it should be poured into a closed container. After sufficient precipitation, the middle upper oil is added to the tank. Do not put the fuel in the fuel tank out of use When the fuel is used up, the impurities in the fuel will enter the diesel coarse and fine filter, which may cause plugging. In addition, the low pressure oil can easily enter the air, causing the engine to start difficult, even if it can start, the speed is not stable during operation. It is forbidden to use old and new oils mixedly. At present, a few hand-operators are required to reduce the operating cost. When replacing the oil, some of the waste oil is left, and half or a large part of the new oil is mixed. As everyone knows, this practice is not worth the candle. Because the waste engine oil contains a large amount of oxidizing materials, rubber particles and many iron filings, it will greatly shorten the life of fresh oil and exacerbate the wear rate of sports. It will not only fail to change the oil, but also cause the burning of the shaft and other machinery. ACCIDENT. No oil is added to the gearbox. To reduce maintenance costs, some operators add waste oil in the oil sump to the gearbox. This is not worth the effort. Because the deteriorated engine oil contains a lot of mechanical impurities, adding the gearbox will cause the moving parts to wear faster. In addition, after the waste oil is added, the gear oil will be thinned and the gear wear will be exacerbated. However, the replaced waste oil can be added to the air filter oil pan to save fresh oil. It is forbidden to use gasoline engine oil instead of diesel engine oil. The engine oil has low viscosity and is suitable for use under light load. Diesel engine oil viscosity, suitable for heavy loads. These two kinds of oil additives and different oxidation resistance, if replaced, the bearing life will be greatly reduced. The oil must be precipitated for 96 hours before use. The fresh oil contains a certain amount of mechanical impurities. Before use, it must be precipitated for more than 96 hours, and then the upper part of the engine oil should be used. In addition, it is forbidden to refuel in dusty areas, etc., and special refueling tools such as fuel tanks and hand pump must be cleaned. The oil level is not allowed to exceed the upper engraved line oil level and exceeds the upper engraved line, which not only increases the oil consumption, causes burning of oil, generates carbon deposits in the cylinder, increases the carbon particles in the oil, and accelerates the wear of cylinders and other parts, shortens the service life. . In addition, the excess oil is sucked into the cylinder and it is easy to produce a racing phenomenon.