Liftmaster 41c4220a Gear and Sprocket Kit for Chamberlain, Sears, Craftsman and LiftMaster 1/3 and 1/2 HP Chain Drive Models

It worked. Watch a you tube video for tricks.

Worked well.

Receive quickly and exactly what I needed

Followed all Instructions. I am a commercial door technician in the greater bay area. This did not work.

Worked perfectly. Exact part number match to number in manual. Follow instructions for install and adjustment and you should have no problems. Took about 2hrs to complete. Suggest removing unit from ceiling and rail. $25.00 vs new door opener. quite a deal.

After my chamberlain door opener died one morning without warning( 17 years of use) I thought crap another $200 for a new one. I decided to open up the box and wow the plastic shavings were everywhere. I looked up parts and found one here on Amazon that was reasonable. Decided to give it a try. Easy to install for the regular DIY person. Adjusted the stops. Now the opener works as well as a new one.

it took longer to disconnect the chain than it did to replace the sprocket kit,,,,,working quite well

Worked great. Had already replaced a gear before but this time the top round metal piece got worn out. Took old out and put new one in. Simple install.

This is the only part that ever wears out on our garage openers. It was very easy to replace the parts and get back in service. I even got a few extra gears for future use.

Part arrived and fit right in. Garage door is now working.