You ll need to get a replacement gear set.
Garage door repair gear replacement.
Keep your garage door opener up and running using garage door opener gear kits from liftmaster.
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Several components will need to be removed to get at the gear.
Remove retaining screws from the cover.
Reinstall the motor unit cover and secure it with the mounting screws.
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Start by unplugging the motor.
All of our garage door opener gear kits include helical gear and top hat assembly worm gear wear bushings grease and hardware needed to replace the dual speed sprocket and gears.
It s one of the most common garage door opener repair problems there is.
This is a video on how to change the gear sprockets in a craftsman garage door opener.
Push the helical gear onto the gear and sprocket assembly shaft and secure it with the retaining clip.
It can be a complicated repair but not impossible to do yourself.
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Put a thin layer of the grease included in the kit on the gear.
With the gears back in place tighten the chain as directed in your owner s manual.
This was a craftsman model 139 53976srt.
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Apply grease to the helical gear.
Replace the cover on the garage door opener plug it back in and start enjoying your now functioning garage door opener.