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1前言ND5型机车主发电机集电环N8修时进行镟修，辅发／励磁机换向器N4修时进行镟修，牵引电动机换向器N2修时进行镟修。美国的原始资料并没有对主发电机集电环、辅发／励磁机换向器、牵引电动机换向器在架修时作明确说明。为了更合理的制订检修范围，从1995年1月份起我们对本段
1 Preface ND5 locomotive main generator collector ring N8 repair 镟 repair, auxiliary hair / exciter commutator N4 repair 镟 repair, traction motor commutator N2 repair 镟 repair. The original American data did not specify the main generator collector ring, auxiliary generator / exciter commutator, and traction motor commutator when it was repaired. In order to make a more reasonable range of maintenance, starting from January 1995 on this paragraph