| Hardened, polished flanks |
 |
Incorrect tensioning |
Change the belt, adjust tension correctly |
| Tension member of belt damaged by incorrect fitting |
Change the belt, fit properly |
| Uneven wear on ribs |
 |
Pulleys are not aligned |
Examine the drive. Line up or, if necessary, replace any non-aligned pulleys, change the belt |
| Substantial belt vibrations |
Check the tension. If necessary, tighten or change the belt |
| Running noises from belt |
 |
Insufficient tension |
Tighten or change the belt |
| Belt past its useful life |
Change the belt |
| Cracks/separations in belt body/ribs |
 |
Belt tension is too high/low |
Change the belt, adjust tension correctly |
| Belt past its useful life |
Change the belt |
| Foreign matter |
| Crack in the belt after a short running time |
 |
Tension members damaged as a result of incorrect fitting |
Change the belt, fitting it correctly |
| Belt excessively tensioned |
Change the belt, adjust tension correctly |
| Dirt accumulation on the belt |
 |
Leaks in the engine or engine compartment (e.g. escape of oil, antifreeze etc.) |
Repair leak(s), change the belt |
| Hardened, polished flanks (different tension values for belts of sets) |
 |
Pulleys not aligned |
Examine the drive, line up non-aligned pulleys and fit a new set of belts |
| Tension member of belt damaged by incorrect fitting |
Change the belt, fitting it correctly |
| Mismatching of belts |
Always replace a complete set of belts |
| Excessive wear on flanks/flanks brittle |
 |
Excessive slip |
Change the belt, adjust the tension correctly |
| Pulleys not aligned |
Examine the drive, line up or, if necessary, replace any non-aligned pulleys |
| Pulleys grooves with uneven wear |
Line up or, if necessary, replace any non-aligned pulleys |
