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

great product works like a champ

The main part (shaft and gear) were exactely the same as the one on my old LiftMaster... But very long ( 3 weeks) and costly delevery (40$ can.) It cost as much for the shipping and handeling as for the part itself. A brand new unit form Sear, in special, go for 120$ Can. So if you want to fix your unit look first for new one in special.

5 *

Used to rebuild Chamberlain 1250LM, 1997 model. Old gears were damaged by an unbalanced door. Took about 45 minutes to change out. Works good.

What is not to like? $20 versus a new door? The old sprocket (installed 2005) sheared off unexpectantly. After a quick research, I found that these would be delivered in 2 days. The item arrived just as expected. All in all, it was a 2-hour install. Couple of tricks I learned: 1) make sure you use vice grips to secure the chain in location. If it is still on the sprocket, I would loosen the chain and then clamp both ends. If your sprocket had sheared, make sure that it is not twisted on either side of the rail and secure as listed above. My chain had twisted (maybe was previously installed wrong) which took some time to untwist it. 2) make sure you use the old mounting screws to tap the new plates mounting holes on the ground. Tapping these holes would be a nightmare after install. Also, No screws are included in the new kit. 3) Note the orientation of the chain cover slots prior to installation. The instructions dont tell you to check this. I had mine rotated 1/3 from the way it should have been and the guard didnt fit up. I found out after everything was installed and running.

Worked great. Save me a lot of money.

The garage door company kept taljing about a new opener $300. Ordered the parts after seeing this repair on youtube. You can do it to.

This worked to fix our double garage door. I wish it had more instructions, but I realize that this may vary per brand. We looked up a video on youtube and watched that to fix our garage door ourselves. Our neighbor commented that he spent a lot of money to have a company fix his and we did ourselves in about 1 hour. The most difficult part was making sure the chain stayed on track and the door was at the correct height.

So ez to repair. I am a female and I was able to repair it in 30 min.

This solved my issue, just hope it can be a better price.