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行星闸齿轮架轴孔是4450拖拉机变速系统中最易磨损的部位，其一旦磨损将导致其它零件的严重损坏。修理实践中采用压钢套修复齿轮架轴孔获得成功，其效果优于进口原机件。
Planetary gear carrier shaft holes are the most vulnerable parts of the 4450 tractor transmission system, which, once worn, can cause serious damage to other parts. Repair practice using steel sleeve repair gear shaft hole success, the effect is better than the original imported parts.