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驾驶员小李经营着一台长春— 12型小四轮拖拉机。春耕前，小李对机车的液压系进行了细致的保养。保养中，他发现液压油泵和操纵机构都完好无损，便清洗了液压油箱以及油道，并更换了新机油。保养后，该车液压提升机构升降自如。然而，小李驾驶机车进行春耕生产时，工作没多长时
Driver Li operates a Changchun-12 small four-wheel tractor. Before spring plowing, Li carried out meticulous maintenance of the locomotive’s hydraulic system. During maintenance, he found the hydraulic pump and steering mechanism intact, they cleaned the hydraulic tank and the oil passage, and replaced the new oil. After maintenance, the car hydraulic lifting mechanism freely. However, Li Xiao Li driving a locomotive for spring production, the work did not take long