During the use of the slewing bearing, due to its own quality and external conditions, its load capacity, rotation accuracy and anti-friction performance will change. When the performance index of the bearing is lower than the use requirements and cannot work, it is called bearing damage or failure. Once the slewing bearing is damaged and other unexpected situations, there will be various abnormal phenomena such as the machine and equipment stop, and the function is damaged.

Therefore, in a short period of time, investigate and deal with the cause of the occurrence and take corresponding measures. The damage of the slewing bearing is much more complicated than that of the general mechanical parts. The damage of the slewing bearing is characterized by many manifestations and complex reasons. The damage of the bearing is in addition to the design and manufacture of the bearing. In addition to the internal factors, it is partly caused by external factors such as improper use, unreasonable bearing design, improper installation, poor lubrication, and poor sealing.