- hardened rubber on the outside of the belt. If the outside of the belt is shiny, inelastic and so hard that no marks are left on it when pressed firmly with a fingernail (Figure 3.6a);
- cracks 2 in the rubber on the outer side of the belt (Figure 3.6b);
- cracks 3 or delaminated material;
- cracks 4 at the base of the tooth;
- 5 cracks on the sides of the belt.
Figure 3.6a. Hardened rubber on the outside of the belt | 
Figure 3.66. Defects of the toothed belt drive: 2 - Cracks in the rubber on the outside of the belt; 3 - Cracks or peeling of material; 4 - Cracks at the base of the tooth; 5 - Cracks on the sides of the belt |
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