Lower the motor unit down.
How to replace chamberlain garage door opener gear.
With the gears back in place tighten the chain as directed in your owner s manual.
Put a thin layer of the grease included in the kit on the gear.
The most common issue that occurs is when the ridges in the gear wear out because the gear lubrication has evaporated.
Install the new gear and sprocket.
This turns the chain and moves the door.
The most common issue that occurs is when the ridges in the gear wear out because the gear lubrication has evaporated.
Use a step ladder to access the garage door opener s power cord and motor unit.
Remove the chain and cable assembly.
Unplug the garage door opener.
In most chamberlain liftmaster and sears openers a motor turns the worm gear and drive shaft inside the opener which rotates the sprocket attached to the top 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.