推荐回答（3个）
汽车转向时方向盘过重的原因，除了轮胎气压不足、车辆前负荷加重、方向盘直径较小外，主要是由于:
①方向器(方向机)安装不妥，方向机内部间隙过小，各个摩擦面毛糙或磨蚀，蜗杆芯轴弯曲，转向臂轴与衬套咬住等。
②转向主销(立人轴)与衬套过紧或咬住，转向节主销压力轴承严重磨损或轧住。
③转向前轮无“前束”或“负前束”，
使轮胎与路面偏磨，前横梁弯扭引起主销内倾、后倾和车轮外倾等。
当转动方向盘过重时，应将前轮全部顶起悬空，转动方向盘感觉轻重，如果仍然沉重，可松开转向套管与驾驶室的座夹再试;如果还是过重，可将转向臂大头与转向臂轴的花细星键脱节后再试;如果还是不行，那就是方向机内部的问题了。此时可以用手搬动前车轮，感觉转向主销或压力轴承有无犯阻现象，如果既查不出转向臂以上的毛病，又不是转向节犯阻，就得考虑转向车轮“前束”是否异常。如果经测量后前束正常，就要考虑是否因前横梁变形而引起一系列的倾角变化，致使转向机构不能正常工作。前横梁是否受损变形，驾驶员是清楚的，如行驶期间前轮受过猛烈冲击，就要考虑保修前横梁，方向过重的毛病就会解决了。
一般方向盘过重，是保修方向机后未能妥善安装，方向机与驾驶室反抗。原因是，先将方向机下部用螺栓固定，然后强迫方向机上部管壁与座紧固，这样转向轴旋转时就产生了阻力。如果方向机先固定上部，然后紧固下部，转动轴的反抗阻力就会消失。车轮“前束”虽在保修时是调整过的，但车辆运行一个阶段后，各个活络部位的磨损、转向主销的松旷及车辆摄击而形成横拉杆弯曲，都使车轮“前束””发生变化。如果前束能及时得到恢复，那么因“前束”异常而引决，不但轮胎会加剧磨损，还会因横拉杆未锁住而引起车辆翻车。所以方向盘过轻这种反常现象应引起重视。
您好，可能是缺油导致的磨损严重，也可能是机械方面的故障，那只能换方向机了，缺油需要检查漏油部位，检修好后补充到正常液位排完空气就可以了，希望我的回答能帮到您，祝您用车愉快！【汽车问题，问汽车大师。4S店专业技师，10分钟解决。】
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