This simple for a garage door technician but is very dangerous if you do not have the proper tools and training.
Garage door pulley loose.
A loose garage door cable is not difficult to deal with but you will need a few key tools to tighten it properly.
This procedure can be hazardous if you are not experienced in working with cable garage door opener systems.
Garage doors that scrape or squeak can be caused by a bad garage door cable pulley.
This video will show you how to repair a mis aligned garage door cable.
Sometimes the garage door will close unevenly or it may not open fully.
If your garage door cables are loose it could be as simple as securing the torsion tube and torsion springs and then rewinding the cables.
Loose cables could be a sign of something more serious.
Step 1 the door opener should have a rope attached to the garage door mechanism.
If you need assistance with your garage door repairs contact an experienced repairman or garage door specialist.