If you need to replace the belt in your belt drive garage door opener, you might be surprised by how simple the task is. As long as you have a guide to follow, be it the one below or the one from your actual owner's manual, you should not have too tough of a time repairing or replacing the belt.
Step 1 - Turn Off the Power
Turn off the power that goes to the garage door opener. That will ensure your safety.
Step 2 - Loosen the Belt Tension
There should be a tensioning spring attached to the traveler on your belt opener. You should be able to use a flat head screwdriver and a crescent wrench to pop the spring out of its position. The tensioning screw should now be loose.
Step 3 - Release the Belt
Your belt should now be attached to the screw with a retainer clip. Pop that clip off, and then remove the master drive chain link. This will release the tension screw from the belt. Then release the belt's teeth from the grooves on the sprocket. Take the end of the belt off the traveler slider.
Step 4 - Release the Pulley
Use a socket wrench to loosen the fastenings on the pulley. Remove the nut, washer and bolt that are holding the pulley in place.
Step 5 - Remove the Belt from the Pulley
The belt should be slid into the pulley. Slide this out of its location. You may have to pull the pulley out from the hole to make this work.
Step 6 - Pull the Belt out of the Hole
Once you have the belt away from the pulley, it should be easy to slide it through the holes at the end of the bar. The belt should be free now. You may have to fully remove the traveler slider from the unit to get the belt free, depending on your model of garage door opener. Check the owner's manual for those details.
Step 7 - Check for Repair
Once you have the belt fully disassembled, you can inspect the belt for repair. Look for any dents you may have and consider gently hammering them down with a hammer and a piece of wood. If the belt just looks dirt, wipe it off with a wet cloth and allow it to dry before you reinstall it. If you notice any rusting, try sanding it down if you can. Otherwise you may have to replace the belt entirely.
Step 8 - Replace the Belt
Whether you need to put a new belt on or need to put the old, repaired one back, the process is the same. Simply follow the instructions above in reverse. Make sure to slide the belt in just as you took it out. Also be sure to tighten down all of the screws well to prevent slippage.