1　问题的提出　　ＤＦ11型机车2000年7月在乌鲁木齐铁路局投入运用,分别配属乌鲁木齐、柳园机务段,主要担当乌鲁木齐至嘉峪关区段的客运任务,为西部铁路的大提速发挥了重要作用。2001年9月,ＤＦ11型机车陆续入哈密机务段首次中修,在对Ｖ—2 4 9型空气压缩机解体时,我们发现几 1 PROBLEM PROBLEMS DF11 locomotives were put into operation in Urumqi Railway Bureau in July 2000 and are assigned to Urumqi and Liuyuan locomotive depots respectively. They mainly serve as passenger transport tasks in the section from Urumqi to Jiayuguan and play an important role in speeding up the railway in the west. September 2001, DF11 locomotive one after another into the HAML locomotive repair for the first time, the V-2 49 type air compressor disintegration, we found a few