Remove the light covers and light bulbs from the motor unit.
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.
Flip the motor unit over.
Fortunately the repair is neither difficult nor expensive and it should only take an hour of your time.
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.
Remove the screws from the chain spreader and pull the chain spreader off the motor unit.
Tried to adjust up and down limits with not success.
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.
This was a craftsman model 139 53976srt.
Shredded plastic gears are a common problem with chain driven garage door openers.
Replaced gear and worm on craftsman 139 53970srt.
Step by step garage door opener gear fix.
I did the repairs with the door fully closed.
Replace the drive gear.
Pull the drive gear off the drive shaft.
Remove the screws from the motor unit cover and pull the motor unit cover off.