Fan troubleshooting
Belt drive issues on fans: tension, alignment, worn pulleys
Belts that vibrate, wear fast or get hot; shiny sheave grooves; setting tension with a meter.
Why belts matter to the bearings
Once drive belts slip they wear fast and use more energy; a loaded belt that is too tight overloads the bearing. A good sign of pulley wear is shiny wear in the sheave grooves.
Belt troubleshooting
| Symptom | Cause | Action |
|---|---|---|
| Belt vibrating, wearing quickly or overheating | Wrong belt type or number for the fan duty | Check against the duty with belt drive calculations |
| Belt slipping, noisy, hot | Not tensioned, worn or damaged | Replace worn belts, set tension with a tension or frequency meter |
| One-sided wear, edge damage | Pulleys not aligned | Align the pulleys with an alignment tool |
| Shiny sheave grooves | Worn pulleys | Check the groove profile with a pulley gauge; replace the pulleys if worn |
Belt-set practice
Replace belts as a set. Re-tension after the first few hours of running when the belts have settled. Align the pulleys after the belt change.
Takeaway. Set the tension with a meter and align the pulleys. A belt that is too tight is a bearing overload; one that is too slack is a minimum-load problem.
Put it to work in the tool