工农-12型手扶拖拉机用低档旋耕时,脱档的原因主要有两方面:一是副变速拨叉轴定位槽倒角大。一般加工要求为0.3×45°,而许多加工成1×45°,使钢球容易从槽内滑出。遇到这种情况,换一个副变速拨叉轴即可。二是定位弹簧长度不够,一般要求为28毫米,而许多弹簧长仅27毫米,弹簧弹力偏小,当然容易脱档。此时可更换符合要 Workers-peasants -12 type tractor with low-grade rotary tillage, the reasons for the release of the two main aspects: First, Vice-shift fork shaft positioning groove chamfer large. The general processing requirements of 0.3 × 45 °, and many processed into 1 × 45 °, so easy to slide out of the ball from the tank. In this case, for a deputy shift fork axis can be. Second, positioning the length of the spring is not enough, the general requirement of 28 mm, while many springs only 27 mm long, the spring stretch is small, of course, easy off the file. At this point can be replaced to meet the needs