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1970年开始,东方红-75拖拉机的支重轮与托链轮的密封装置,由原来的轴向密封结构改为径向密封结构(图1)。改为径向密封结构,安装方便。但密封性能很差,用户反映比较强烈。我省大部分机车在进厂修理时,都将新的径向密封改为原来的轴向密封,每台改装费80元,外加密封壳、防尘罩、大小密封环、密封套、密封弹簧等近10种零件,共计212件,需花339.34元(见表),合计每台改装得花419.34元。按此计算,国家每年分配我省五、六百台东方红-75拖拉机,这样相当于社队增加了20多万元的
From 1970 onwards, Dong Fang Hong -75 tractor roller and carrier sprocket sealing device, from the original axial seal structure to a radial seal structure (Figure 1). To radial seal structure, easy installation. But the sealing performance is poor, users reflect more strongly. Most of our province locomotive repair into the factory, the new radial seal will be replaced by the original axial seal, each modification fee 80 yuan, plus sealed shell, dust cover, the size of the seal ring, gland, seal spring Nearly 10 kinds of parts, a total of 212, need to spend 339.34 yuan (see table), totaling 417.34 yuan per conversion was spent. According to this calculation, the state allocates five or six hundred Dongfanghong -75 tractors in our province each year, which is equivalent to an increase of more than 200,000 yuan