| • | Scuffed gear teeth |
| • | Nicked gear teeth |
| • | Burred gear teeth |
| • | Broken gear teeth |
| • | High spots (Small shiny spots on the gear teeth mating surfaces) that could cause gear noise |
| • | Roughness of rotation |
| • | Burrs |
| • | Pitted condition |
| • | Bearing cage damage |
| • | Scoring |
| • | Wear |
| • | Overheating |