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上海-50拖拉机长期使用后,由于快慢档齿轮严重磨损,轴向推力已超过换档轴自锁弹簧的弹力时,会出现快慢档欲脱档而不能,行进中拖拉机一窜一窜的现象,导致拖拉机无法作业。发现以上情况后,在能够买到快慢档齿轮的情况下,买来配件换上即可。但有时买不到配件,或在农忙季节,即使有配件,更换快慢档齿轮也需要较长的维修时间,往往误农时。遇此情况,可拆下变速箱和后桥盖,抽出快慢档换档轴,将快慢挡换档叉调转180°,重新装上快慢档换档轴,继续使用。因为快慢档换档叉反装后,快慢档换档又较长的一端正好抵在变速箱壳体上。这样一来,尽管换档轴自锁弹簧克服不了快慢档齿轮产生的轴向推力,但是快慢档换档叉
Shanghai -50 tractors long-term use, due to the serious speed gear gear wear, the axial thrust has exceeded the elastic force of the shift shaft self-locking spring, there will be speed stalls want to off the file and can not, traversing a channeling a channeling phenomenon, Cause the tractor can not work. Found that the above situation, in the case of being able to buy speed gear, bought accessories can be replaced. But sometimes can not buy parts, or in the busy season, even if there are parts, speed gear change also requires longer maintenance time, often when farming. In this case, you can remove the gearbox and the rear axle cover, draw the speed gear shift shaft, the speed of the gear shift fork 180 °, re-install the speed gear shift shaft, continue to use. Because the speed gear shift fork anti-installed, speed gear shift and longer end just arrived in the gearbox housing. As a result, although the shift shaft self-locking spring can not overcome the axial thrust generated by the speed gear, but the speed gear shift fork