编辑同志: 我有一台东方红—75拖拉机已装上了推土铲,与东方红—60推土机比没有后者的效率高,原因是没有倒Ⅱ档。我想把变速箱改为东方红—60的变速箱,不知要换哪些主要齿轮和零件? 黑龙江省富裕县富路乡得利村五队张洪财张洪财同志: 编辑部转来了您的来信,现回答如下: 东方红—75拖拉机装上推土铲后,其作业工况发生了变化。这样就带来了几个问题,第一,“东方红—75”Ⅰ档的速度偏高,不大适于推土作业的要求。(其一是推力小,其二是不好操纵):笫二、原倒档的速 Edit comrades: I have a Dongfanghong -75 tractor has been equipped with a bulldozer, and the Dongfanghong -60 bulldozer more efficient than the latter, because there is no second gear. I would like to change the gearbox to the East Red -60 gear, I do not know what to change for the main gear and parts? Fulu County, Fulu County, Heilongjiang Province Deli Village five Zhang Hongcai Zhang Hongcai comrades: editorial department turn your letter, now The answer is as follows: Dongfanghong -75 tractor mounted bulldozer, the operating conditions have changed. This brought a few problems, first, “Dongfanghong -75 ” I file speed is too high, not suitable for bulldozing requirements. (One is the thrust is small, and the second is not good manipulation): Zi Second, the original reverse speed