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1前言大连港务局现有东方红（5）型内燃机车7台，“八五”期间还将增加8台调小内燃机车，以全部取代现有的9台调小蒸汽机车，逐步向“机车内燃化”过渡。目前，从大连港务局现有机车的使用情况来看，现行的维修制度存在着严重的过剩维修现象。为了确定合理的维修周期，我们在东
1 Introduction Dalian Port Authority currently has 7 Dongfanghong diesel locomotives (5) and will also increase its capacity of 8 diesel locomotives within the “Eighth Five-Year Plan” period to completely replace the existing 9 steam locomotives and gradually provide “ Internal combustion ”transition. At present, judging from the existing locomotive usage in Dalian Port Authority, there is a serious over-repairing phenomenon in the current maintenance system. In order to determine a reasonable maintenance cycle, we are in the East