外机配件国产化有许多益处:①价格便宜;②供货及时;③可以为国家节省大量外汇。但是,目前国产的外机配件存在不可忽视的质量问题。以4450拖拉机的空气过滤芯为例,我场的12台4450拖拉机全部换用了国产的滤芯。这种国产滤芯,当机车转速超过2000转/分时,其保养信号灯就发亮。在这种情况下,有的停车(影响生产),有的继续作业(严重危胁缸筒活塞的使用寿命)。现在我队已有1/3的4450拖拉机的活塞缸筒 Localization of foreign machine parts has many benefits: ① cheap; ② timely delivery; ③ can save a lot of foreign exchange for the country. However, there are some quality problems that can not be neglected in the current domestic machine parts. To 4450 tractor air filter, for example, my field of 12 4450 tractors all used for the domestic filter. This domestic filter, when the locomotive speed exceeds 2000 rev / min, its maintenance signal light on. In this case, some parking (affecting production), some continue to work (a serious threat to the life of the cylinder piston). Now I have 1/3 of the 4450 tractor piston cylinder