1. Apply a force of 100 N by pulling or pressing it at point A, measure the belt deflection and compare it with the standard.

2. Use a belt deflection measuring device at point A.

| New belt | Used belt | |
| Deviation | 4.0-5.0 mm | 5.0-5.5 mm |
| Tension | 55-65 kg | 40-50 kg |
