Replacing Worm Gear Craftsman Garage Door Opener

Remove the screws from the chain spreader and pull the chain spreader off the motor unit.

Replacing worm gear craftsman garage door opener.

Tried to adjust up and down limits with not success. Remove the screws from the motor unit cover and pull the motor unit cover off. Flip the motor unit over. Pull the drive gear off the drive shaft.

Step by step garage door opener gear fix. Remove the light covers and light bulbs from the motor unit. Door now opens about 1 foot and stops. This is a video on how to change the gear sprockets in a craftsman garage door opener.

Use a punch and hammer to drive the roll pin out of the drive shaft. I did the repairs with the door fully closed. Replaced gear and worm on craftsman 139 53970srt. This was a craftsman model 139 53976srt.

Replace the drive gear. Fortunately the repair is neither difficult nor expensive and it should only take an hour of your time. Remove the gear and sprocket assembly. Insert the new roll pin through the gear and drive shaft.