一台桂花工农-12型手扶拖拉机更换一、倒档拨又后，挂一档起步，但只走了10多米就自动脱档。经检查发现是由于机手在安装时，将一、倒档拨义轴装反了，致使挂一档时，齿轮移动不到位，造成只有一小段轮齿啮合，受力后齿轮渐沿轴向移动，最终脱档。原来一、倒档拨叉轴上的定位环 A sweet-scented osmanthus worker-12-type tractor to replace a reverse gear dial, hang a file started, but only go away more than 10 meters off the file automatically. The inspection found to be due to the hands of the installation, will be a reverse gear axed anti-mounted, resulting in hanging a file, the gear is not in place, resulting in only a small amount of gear meshing, the force gradually along the axial direction Move, finally off the file. The original one, reverse shift fork shaft positioning ring