东方红-75型拖拉机易烧第三道主轴瓦,主要原因是:第三道主轴颈本身没有油孔及离心净油腔,进入第一、二、四、五道主轴瓦的润滑油都能进入离心净油腔,即使主油道进入大量磨粒,由于有离心净油腔,磨粒不容易堵塞在第一、二、四、五道主轴瓦的配合表面,而进入第三道主轴瓦的润滑油不能进入离心净油腔,所以,当主油道有大量磨料时,必然堵塞在第三道主轴瓦的配合表面,使油膜破坏,造成烧第三道主轴 Dongfanghong -75 tractor easy to burn the third main bearing, the main reason is: the third main journal itself does not have oil holes and clean oil chamber, into the first, second, fourth, five main bearing oil can Into the centrifugal oil chamber, even if the main oil into a large number of abrasive, due to a clean oil chamber, the abrasive is not easy to plug in the first, second, fourth and fifth main bearing mating surface, and enter the third main bearing bush Of the oil can not enter the clean oil chamber, so when the main oil a large number of abrasive, the inevitable blockage in the mating surface of the third bearing bush, so that the oil film damage, resulting in burning third spindle