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对ND_5型机车牵引电动机传动齿轮的脱落故障进行了分析，并提出了改进措施。还简要地介绍了牵引齿轮加工组装的方法以及运用情况。
The failure of the driving gear of ND_5 locomotive traction motor was analyzed and the improvement measures were put forward. Also briefly introduced the traction gear processing and assembly methods and application.