拖拉机许多单件在装配时须预先涂些润滑油，对延长零件使用寿命和改善机车性能很有好处，下面就零件装配时上油的不同作用作简单的介绍。以方便拆装为目的装配活塞销时，在连杆小头村套内和活塞销端头涂一些机油，便于活塞销的进入。更换气门导管时，在气门导管外圆上抹一些机 Many single tractors in the assembly of the pre-coated with some lubricants, to extend the service life of parts and improve locomotive performance is very good, the following parts of the assembly when the role of different oil for a brief introduction. To facilitate the disassembly for the purpose of assembling the piston pin, in the connecting rod small head of the village set and piston pin end coated with some oil, easy to enter the piston pin. When replacing the valve guide, wipe some of the outer circumference of the valve guide