Replacing Worm Gear Craftsman Garage Door Opener

Remove the gear and sprocket assembly. Step by step garage door opener gear fix. Replaced gear and worm on craftsman 139 53970srt.

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Replace the drive gear.

Replacing worm gear craftsman garage door opener.

Remove the screws from the motor unit cover and pull the motor unit cover off. This is a video on how to change the gear sprockets in a craftsman garage door opener. I did the repairs with the door fully closed. Door now opens about 1 foot and stops.

Flip the motor unit over. Tried to adjust up and down limits with not success. Remove the light covers and light bulbs from the motor unit. Use a punch and hammer to drive the roll pin out of the drive shaft.

This was a craftsman model 139 53976srt. Fortunately the repair is neither difficult nor expensive and it should only take an hour of your time. 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. Remove the screws from the chain spreader and pull the chain spreader off the motor unit.

Shredded plastic gears are a common problem with chain driven garage door openers. Pull the drive gear off 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. Insert the new roll pin through the gear and drive shaft.

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