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Several problems easily overlooked in the maintenance of agricultural machinery
In the maintenance of agricultural machinery, there are several problems that are easily overlooked: 1. Oil sump oil depends only on quantity, not quality. Some drivers only know how to add oil and ignore quality checks. As everyone knows, long-term use of oil contains a large number of oxides and metal shavings, resulting in reduced lubricating properties, parts wear increased. Therefore, the engine should be regularly changed according to the specified cycle. 2. Only maintain the air filter, do not service the exhaust pipe and muffler. Some drivers never clear the exhaust pipe and muffler carbon deposits, resulting in too thick carbon deposits, exhaust cross-sectional area decreases, resulting in exhaust gas exhaust, fresh air into the lack of combustion deterioration. 3. Add only cooling water, regardless of cooling effect. Some drivers never remove scale, although the cooling water is sufficient, but the cooling effect is poor, causing multiple failures. 4. Only pay attention to the quality of the plunger coupler and the injector needle valve assembly. Do not pay attention to the quality of the outlet valve assembly. One of the functions of the oil valve is sealing, that is, the plunger oil chamber is separated from the high-pressure fuel pipe to avoid backflow; the second is to quickly depressurize when the oil supply is stopped, so as to ensure that the fuel injector is cut off and broken. Even if the delivery valve is of poor quality or worn out, it will cause many diesel engine failures. 5. Only pay attention to the state of the valve and valve seat and pay no attention to the quality of the valve spring. When the valve leaks, people are accustomed to checking the valve and valve seat and ignore the check of valve spring quality. It should be pointed out that the lack of elasticity of the valve spring is also one of the causes of the valve leakage failure.