1　问题的提出　　自 1999年 12月起 ,我段陆续有 7台ＤＦ4Ｃ型机车装用了 30 2型联合调节器 ,在 2 0 0 1年 3～ 9月短短 7个月的时间里 ,陆续发生了 3台转筒断裂而引起的柴油机“飞车”、极限调速器动作、柴油机自动停机的机破故障 ,断裂故障率达 4 2 8% ,经济损失较大 ,不同 1 Issues raised Since December 1999, there have been seven sets of DF4C locomotives fitted with 30 2 type regulators in succession. In the short period of 7 months from March to September 2001, one after another occurred The diesel engine “Speed” caused by 3 drum breakage, the action of limit speed governor, the broken machine failure of diesel engine automatically shut down, the fault failure rate reached 428%, the economic loss was larger and different