Pull the chain off the motor unit sprocket and out of the chain spreader.
How to change drive gear on craftsman garage door opener.
Replace the drive gear.
How to replace a gear and sprocket in a chamberlain liftmaster sears craftsman garage door opener duration.
2 drive out the roll pin holding the old gear in place with a pin punch and hammer.
4 replace gear mechanism lining up the screw holes on top.
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Remove the outer nut and lock washer from the trolley threaded shaft and pull the threaded shaft out of the trolley.
This is a video on how to change the gear sprockets in a craftsman garage door opener.
With the gears back in place tighten the chain as directed in your owner s manual.
This was a craftsman model 139 53976srt.
Insert the new roll pin through the gear and drive shaft.
Use a punch and hammer to drive the roll pin out of the drive shaft.
Replace the cover on the garage door opener plug it back in and start enjoying your now functioning garage door opener.
Slide the outer trolley away from the inner trolley.
3 lube all the teeth of the replacement gear and the worm gear it engages then place the new gear on the shaft and drive the roll pin back in to hold it.
Put a thin layer of the grease included in the kit on the gear.
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.