有些上海50拖拉机使用一段较长时间后产生了前轮磨损过快的现象，究其原因主要是前轮前束调整不当。影响前轮前束调整的因素可归纳如下；（1）摇摆轴与前轴支架孔磨损及摇摆轴衬套磨损，间隙过大。一般说来，新的上海50前轮前束是较易调整的。但当机子使用了几年后，由于摇摆轴 Some Shanghai 50 tractors used for a long period of time produced a front wheel wear too fast phenomenon, mainly due to the front wheel beam to adjust properly. Affect the front wheel toe adjustment factors can be summarized as follows: (1) swing axis and front axle bracket hole wear and swing shaft bush wear, clearance is too large. In general, the new Shanghai 50 front toe is easier to adjust. But when the machine used a few years later, due to the swing axis