针对NJ2型内燃机车走行部出现的质量问题进行了阐述,从轮径偏差、轮缘偏磨、螺旋弹簧断裂、导框衬碎裂、轴箱拖铁和中心销及横向减振器螺栓断裂、构架扫石器安装板及螺栓断裂、牵引电动机轴承盖螺栓断裂等方面简要分析了问题的症结,同时结合机车实际情况提出了相应的建议或措施。 Aiming at the quality problems of NJ2 diesel locomotive running section, this paper discusses the quality problems of running section of NJ2 diesel locomotive from the aspects of wheel diameter deviation, eccentric rim wear, coil spring breakage, fragmentation of guide frame, bolt dragging of center box and transverse shock absorber bolts, The structure of the stone-sweeper mounting plate and bolt rupture, traction motor bearing cap bolt rupture and other aspects of a brief analysis of the crux of the problem, combined with the actual situation of the locomotive put forward the corresponding recommendations or measures.