Rollers
Rollers are the small wheels on short stems that run inside the track. Steel rollers tend to be louder, while nylon rollers with sealed bearings usually run quieter.
A worn roller may wobble, look flat on one side or have a cracked wheel. You often hear it as a grinding or clicking that travels up the track with the door.
- Where
- Inside each side track
- Job
- Guide the door up and down
- Worn sign
- Grinding, wobble, cracked wheel