How To Replace Worm Gear On Sears Garage Door Opener

I replaced just the main gear with the sprocket and shaft assembly for 25 or so from a supplie.

How to replace worm gear on sears garage door opener.

Drive and worm gear kit 41c4220a is an original equipment manufacturer oem part that fits most craftsman 139 series chain drive garage door openers manufactured after 1993. The worm gear which attaches to the motor shaft meshes with the drive gear to spin the sprocket and drive the chain to open and close the garage door. This diy repair guide explains how to replace the gear and sprocket assembly on a chain drive garage door opener. This was a craftsman model 139 53976srt.

Located at the top of the motor unit the gear and sprocket assembly drives the chain that opens and closes the garage door. This turns the chain and moves the door. If the gear and sprocket assembly breaks the motor runs but the door won t move. My sears chain drive garage door opener s main gear is worn.

Kit also fits chamberlain chain drive garage door opener models 1240r 1245r 1246r 1255r 1256r 2280 2280 267 and 2280 976. This diy repair guide explains how to replace the drive and worm gears on a chain drive garage door opener. The most common issue that occurs is when the ridges in the gear wear out because the gear lubrication has evaporated. 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.

If the gears break or strip the door won t move. Step by step garage door opener gear fix. This is a video on how to change the gear sprockets in a craftsman garage door opener.