How To Replace A Garage Door Opener Gear

Remove retaining screws from the cover.

How to replace a garage door opener gear. This is a video on how to change the gear sprockets in a craftsman garage door opener. Only replace the parts that are used on your garage door opener. Remove the outer nut and lock washer from the trolley threaded shaft and pull the threaded shaft out of the trolley. Press this lever and you will be able to remove the belt from the gear and pulley.

Remove the 3 nuts that hold the motor to the frame and then remove the worm gear. Re install other components in reverse order. Remove the fastener ring from the straight door arm connected to the outer trolley. Slide the outer trolley away from the inner trolley.

This was a craftsman model 139 53976srt. If you have any other broken gears or parts replace those as well. Install the new worm gear making sure the roll pin is properly seated in the new gear. Position a work table near the area under your motor unit to hold the garage door opener during the repair.

With the gears back in place tighten the chain as directed in your owner s manual. Push the pin in with a nail set in order to remove the gear. Lay the chain on the garage floor while you complete the repair. Use all necessary replacement parts and reassemble the garage door opener in the reverse order.

I only had one stripped gear while the rest of the parts looked ok. Pull the chain off the motor unit sprocket and out of the chain spreader. If the gears have screwed up teeth you can likely just replace them to solve the problem. If not your opener might simply be shot and you ll need a new one.

Replace the cover on the garage door opener plug it back in and start enjoying your now functioning garage door opener. Pull the emergency release rope to release the trolley from the garage door. Release the tension on the belt with the small lever near the gear. Put a thin layer of the grease included in the kit on the gear.

Set the new gear in place and secure with the metal pin.