Slide the outer trolley away from the inner trolley.
How to change drive gear on craftsman garage door opener.
How to replace a gear and sprocket in a chamberlain liftmaster sears craftsman garage door opener duration.
Replace the drive gear.
This was a craftsman model 139 53976srt.
Lay the chain on the garage floor while you complete the repair.
Remove the outer nut and lock washer from the trolley threaded shaft and pull the threaded shaft out of the trolley.
Pull the chain off the motor unit sprocket and out of the chain spreader.
Pull the drive gear off the drive shaft.
Use a punch and hammer to drive the roll pin out of 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.
Step by step garage door opener gear fix.
Replace the cover on the garage door opener plug it back in and start enjoying your now functioning garage door opener.
Insert the new roll pin through the gear and drive shaft.
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.
2 drive out the roll pin holding the old gear in place with a pin punch and hammer.
This is a video on how to change the gear sprockets in a craftsman garage door opener.
Nick sgaragedoorservice 148 624 views 41 15.