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我段东风４Ｂ型货运机车在运用中，多次发现因主发励磁回路的故障造成的碎修、临修、机破。其中励磁机接地烧损１件，主发转子滑环接地１件，主发转子输入线５７７＃×２线烧损及磨破接地各１件，励磁机引入线６４６＃线烧断１件。１９９７年，我段给紫荆岭机务段中修机车中，
In the application of DF4B freight locomotive, I found several broken repairs, temporary repairs and machine broken caused by the failure of the primary excitation circuit. Including exciter ground burn 1, the main rotor slip ring grounding 1, the main rotor rotor input line 577 # × 2 line burnout and wear ground one each, the exciter lead line 646 # line blown a. In 1997, I gave Zijingdian locomotive repair locomotive,