There are several misunderstandings in the agricultural machinery maintenance industry that should be corrected. 1 Sliding bearing non-scratchable engine crankshaft bearings and connecting rod bearings must be scraped with, it does not seem to scratch can not guarantee a good contact surface, even the new crankshaft, standard tile also scraping, I do not know some small engines, crankshaft bearings The wear-resistant alloy coating of the connecting rod bearing is very thin, it does not allow scraping and can only be matched according to the regulations. 2 The water temperature of the engine is not afraid of high, and the temperature of the water is found to be high, and all possible means are found to eliminate the cause. If the water temperature is low, it is considered correct. In fact, the low water temperature hazard is also very large, resulting in inadequate fuel combustion, resulting in reduced power, increased fuel consumption, poor lubrication, and increased charcoal collection in the combustion chamber. 3 The valve clearance is rather large or not. Actually, when the valve clearance is large, the lift of the valve becomes smaller and the opening degree is not enough, so that the insufficient intake air is exhausted and the engine power is reduced. 4 plus more oil Ning more can not be considered less easy to burn bearings, a little more related to the point, in fact, more oil added to the same engine damage, increase the resistance of the crankshaft and connecting rod movement, the oil splashed on the cylinder wall , Enter the combustion chamber, resulting in increased carbon capture, affecting emissions. 5 Humidity in the hub should not be less than the total amount of butter in the hub is always considered the best, in fact, this is a waste of butter, and second, butter easily heated after the oil seal or paper pad, but also affect the heat. 6 The fuel injection angle is rather large. The fuel injection angle is too large. The engine accelerates rapidly. When starting or going uphill, the engine generates knocking and knocking. The damage to the piston connecting rod is great, and the starting motor resistance increases. Affects the service life of the vehicle. 7 Fastening screws will not loosen the bolts that cannot reach the specified torque for various parts of the locomotive will loosen. It is not good, but blindly increasing the torque will deform the parts that are fastened, artificially causing artificial screw elongation. Deform or even break the thread. 8 When the maintenance is disassembled and checked, it is bound to damage the fit state that has been broken down. If the operator is not equipped with a high level of assembly, the service life of the components will be shortened. 9 Tyre pressure is rather high. Low tire pressure is too high or too low will affect its service life, and it is also unfavorable for safe driving. The scientific inflation standard should be: based on the standard tire pressure, with the temperature changes, the tire pressure changes slightly. For example, summer should be 5%--7% lower than winter, because taking into account the high summer temperatures, the gas is heated, the volume increases the pressure, in contrast, the winter must reach the standard pressure or slightly lower. 10 Fuel injector injection pressure is rather high or not. Some repairmen and drivers like to adjust the fuel injector pressure. They like high or low pressure, and sometimes even higher than the standard pressure. They think that the pressure is high and the fuel atomization is good. Do you not know that when the injection pressure is high, it is more difficult for the engine to start the same, there is a similar supply time for the production of knocking sounds, and the operation is not stable enough. If the injection pressure is too high, it may cause no fuel injection and it will not start at all. At the same time, it will also increase the wear of the plunger and the outlet valve.
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