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.

How to replace worm gear on sears garage door opener.

Step by step garage door opener gear fix. 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. This diy repair guide explains how to replace the gear and sprocket assembly 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.

This was a craftsman model 139 53976srt. This turns the chain and moves the door. 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. 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.

My sears chain drive garage door opener s main gear is worn. The most common issue that occurs is when the ridges in the gear wear out because the gear lubrication has evaporated. This turns the chain and moves the door. If the gear and sprocket assembly breaks the motor runs but the door won t move.

This is a video on how to change the gear sprockets in a craftsman garage door opener. Located at the top of the motor unit the gear and sprocket assembly drives the chain that opens and closes the garage door. If the gears break or strip the door won t move.