一机手反映,他驾驶的东方红-75型拖拉机,常常发生主、被动齿轮打齿,后桥壳损坏的故障。这不,刚换上没多久的后桥壳又坏了。检查时发现,后桥壳右后托架的Φ90.5±0.1孔中垫了约3毫米厚的铜皮。疑是后轴弯曲了,遂检查后轴弯曲度,小于0.4毫米,符合要求。当将右后托架孔中的铜皮去掉后,后轴与后桥壳右边的Φ90.5毫米半圆孔之间竟出现了3毫米的 A machine hand reflects his driving Dongfanghong -75 tractor, often occurs in the main and passive gear teeth, rear axle housing damage failure. This is not, just put on the rear axle housing is broken. Inspection revealed that the rear axle housing right rear bracket Φ90.5 ± 0.1 holes pad about 3 mm thick copper skin. Suspected rear axle bent, then check the rear axle bending, less than 0.4 mm, to meet the requirements. When the right rear bracket hole in the copper removed, the rear axle and rear axle housing on the right half of the hole between the Φ90.5 mm actually appeared in 3 mm