Excavator failure analysis: Why is there a strange noise in the slewing ring?

Excavator failure analysis: Why is there a strange noise in the slewing ring?

Since the slewing bearing of the excavator generally works under heavy load conditions, and 

the working environment of the excavator is relatively bad, the slewing bearing is prone to 

failure, and the most common is the occurrence of various abnormal noises. What is the 

cause of the abnormal noise? What should I do to troubleshoot?
1. The mounting surface is not flat and the mounting bolts are loose;
2. The slewing bearing has foreign matter;
3. The abnormal noise caused by the grease problem;
4. The abnormal noise caused by the damage of the sealing strip;
5. Tabnormal noise caused by cracks, indentations or rust;
6. The raceway and rolling elements are seriously worn.

Tensun slewing bearing maded by qualified components and strictly control the process that 

make the slewing bearing high speed ratorting and low noise.