Lubricating oil is commonly referred to as oil, and the standard for adding lubricating oil to the combine harvester is to make the surface of the oil in the engine bottom case be located between the upper and lower scales of the oil scale, and it is better to add high quality lubricating oil. There are "three bogeys" for adding lubricating oil to the combine harvester.
A new and old engine oil is mixed. The old engine oil contains substances with strong oxidation properties. After the new and old engine oils are mixed, the effect of the new engine oil can be reduced. If you add new oil at a time in the engine, you can use more than 500 hours. If half of the new engine oil is blended with half of the old engine oil, the use time is less than 200 hours. Because of poor lubrication of old oil, it is easy to cause serious wear and black smoke.
Second, avoid too much oil added. When it exceeds the upper scale of the oil scale, the oil can easily enter the combustion chamber, causing the exhaust pipe to spray oil and emit blue smoke. This will not only increase the consumption of oil, but also incomplete combustion of the engine oil will produce a lot of coke on the top of the piston and valve seat, aggravate the wear of mechanical parts, and even cause the piston to die or damage.
Three avoid the oil is not added in time. If the oil is not added in time, the oil level of the oil pan will be too low, resulting in high oil temperature and poor lubrication. What's more, because the oil level of the oil pan is lower than the lower scale of the oil scale, the combine harvester may expose the oil filter to the oil surface, so that the oil pump cannot draw in air to supply oil, causing serious accidents such as burning tiles.
A prism is a polyhedron made of transparent materials (such as glass, crystal, etc.). It is widely used in optical instruments. Prisms can be divided into several types according to their properties and uses. For example, the "dispersion prism" that decomposes the composite light into the spectrum in a spectrometer is more commonly used is an equilateral prism; in a periscope, binocular telescope and other instruments, the direction of light is changed to adjust its imaging position. "Reflecting prisms" generally use right-angle prisms.
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