Causes of side wear of synchronous belt:
1. The pulley is not parallel;
2. The rigidity of bearing is insufficient;
3. The pulley rib is bent;
4. The diameter of the pulley is smaller than the width of the belt.
The countermeasures are as follows
1. Correct and position the pulley;
2. Increase the rigidity of the bearing and fix it firmly;
3. Trim or replace the edge;
4. Check the design.