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.
How to replace chamberlain garage door opener gear.
Remove the gear and sprocket assembly.
Remove the chain and cable assembly.
With the gears back in place tighten the chain as directed in your owner s manual.
Use a step ladder to access the garage door opener s power cord and motor unit.
Install the new gear and sprocket.
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.
Put a thin layer of the grease included in the kit on the gear.
This turns the chain and moves the door.
Lower the motor unit down.
The most common issue that occurs is when the ridges in the gear wear out because the gear lubrication has evaporated.
Replace the cover on the garage door opener plug it back in and start enjoying your now functioning garage door opener.