Put a thin layer of the grease included in the kit on the gear.
How to change drive gear on craftsman garage door opener.
Replace the cover on the garage door opener plug it back in and start enjoying your now functioning garage door opener.
Remove the outer nut and lock washer from the trolley threaded shaft and pull the threaded shaft out of the trolley.
With the gears back in place tighten the chain as directed in your owner s manual.
Use a punch and hammer to drive the roll pin out of the drive shaft.
This was a craftsman model 139 53976srt.
This is a video on how to change the gear sprockets in a craftsman garage door opener.
Step by step garage door opener gear fix.
4 replace gear mechanism lining up the screw holes on top.
Pull the drive gear off the drive shaft.
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.
Pull the chain off the motor unit sprocket and out of the chain spreader.
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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.
Replace the drive gear.
2 drive out the roll pin holding the old gear in place with a pin punch and hammer.
Lay the chain on the garage floor while you complete the repair.