1. Whether the chain connection is loose or deformed;
2. Whether there is abnormal noise or vibration when the chain is running, and whether the chain lubrication is kept good;
3. Check whether the chain pin has signs of embroidery, deformation or rotation;
4. Whether the inner/outer chain plates of the chain are twisted, embroidered or cracked.
5. Whether the rollers of the chain plates are broken, damaged or excessively worn.
