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拖拉机在行驶作业中．支重台车不仅要支承着整台拖拉机的重量．还要承受冲击载荷．逐渐使其零件磨损或变形。当摆动轴与平衡育小轴套磨损、配合间隙增大、大小缓冲弹簧的弹性变弱时．都会使每个支重台车上的两个支重轮中心距离变大．使支重台车弹性是架的缓冲和减震性能降低．
Tractor in driving operation. The trolley not only supports the weight of the entire tractor. Also bear the impact load. Gradually wear or distort parts. When the swing shaft and balanced bearing sleeve wear, with the gap increases, the size of the spring damping of the weakened. Will make each trolley on the two roller center distance becomes larger. So that the weight of the trolley flexible cushioning and damping performance reduction.