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我厂的c630—1车床,在长期使用过程中,主传动(床头内)经常出现Ⅳ轴变速双联齿轮(件号为02061)打齿或1：16挡无变速。其主要原因是Ⅱ轴
I plant c630-1 lathe, the long-term use of the process, the main drive (bed) often appear Ⅳ-axis variable speed double gear (part number 02061) hit tooth or 1:16 no gear. The main reason is the Ⅱ axis