1953年我场有五台SL一50/55拖拉机,仅工作300—400小时,所有支重轮铜套都严重磨损。在鉴定铜套磨损程度时,我们发现所有磨损的铜套都是外圆面磨损严重,内圆面却很少磨损。技工海湧涛同志即根据C—80拖拉机和蓝兹拖拉机支重轮铜套的结构,建议将铜套压紧在轮毂内,经领导同意后,即在1号机车上试行改装。直到现在, In 1953 I had five SL-50/55 tractors in my field, working only for 300-400 hours, all of which were severely worn. In appraising the degree of copper sleeve wear, we found that all worn copper sleeves were heavily worn on the outer circumference and less on the inner circumference. Mechanics Haiyong Tao comrades that is based on C-80 tractor and blue-wheel tractor bronze structure, it is recommended that the copper sleeve compacted in the hub, with the consent of the leadership, that is, the No. 1 trial modification of the locomotive. Until now,