东方红-75型拖拉机支重台车内平衡臂摆轴孔端面磨损严重或有裂纹时,可用补板法修理:将轴孔两端面铣出椭圆凹陷,扩大摆动轴孔;制作一块带凸缘的椭圆形补板,将凸缘对准摆动轴孔,用螺栓将其固定在内平衡臂椭圆凹陷处;沿补板边缘填焊,并焊补裂纹及磨 Dongfanghong -75 tractor-mounted trolley within the balance arm swing axis hole end face serious wear or cracks, patch method can be used to repair: both ends of the shaft hole milling elliptical recess, expanding the swing axis hole; making a flange Elliptical patch plate, the flange alignment pivot shaft hole, with bolts to fix it in the oval balance of the balance arm; padding edge along the filler, and welding crack and wear repair