Push rod and intermediate shaft must be frequently per year lubricated by ball bearing grease. 推杆和中间轴必须每年用轴承油润滑。
It was assumed that the vibration generated by rotating a near perfect ball bearing will produce random signals if the bearing does not have significant defects on the rings and/ or on the balls, and if grease and surfaces are free of foreign particles. 假定轴承的套圈及钢球没有严重缺陷,油脂也没有异物颗粒落入沟道上,则完美或近完美的轴承振动将产生随机讯号。