Replacing Worm Gear Craftsman Garage Door Opener

Shredded plastic gears are a common problem with chain driven garage door openers.

Replacing worm gear craftsman garage door opener.

Slide the new drive gear onto the drive shaft and line up the mounting hole in the drive gear with the hole in the drive shaft. So if you suddenly find that the motor on your garage door opener sounds like it s running but the door is not moving checking for worn gears is the first thing you should do. Use a punch and hammer to drive the roll pin out of the drive shaft. This is a video on how to change the gear sprockets in a craftsman garage door opener.

Replaced gear and worm on craftsman 139 53970srt. Insert the new roll pin through the gear and drive shaft. Pull the drive gear off the drive shaft. Tried to adjust up and down limits with not success.

Remove the gear and sprocket assembly. Flip the motor unit over. Replace the drive gear. Fortunately the repair is neither difficult nor expensive and it should only take an hour of your time.

Remove the screws from the chain spreader and pull the chain spreader off the motor unit. Remove the screws from the motor unit cover and pull the motor unit cover off. Remove the light covers and light bulbs from the motor unit. Door now opens about 1 foot and stops.