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

I was able to replace my sheared-off gear assembly in my Chamberlain LiftMaster 1/2 HP garage door opener in about two hours. I recommend searching YouTube for the excellent instruction video I followed (it made it so much easier): https://youtu.be/nmZlYQAZmLg After a few days the garage door opener continues to function properly.

We were so happy to find exactly the part my husband needed to repair our garage door! Perfect!

If you have some basic mechanical skills, buy this and save yourself a lot of money. It appeared to be good quality and installed easily and got my opener working again.

Saved me several hundred dollars with this diy repair kit and only a few hours of work.

Easy install

Does what it is made to do…with one exception. The set screws on the collar on the end of the worm gear shaft are too long and hit the little circuit board next to it. The tabs on the black plastic interrupter run in a slot between two circuit boards one of which is the one the screws would hit. Good that I noticed that before running it or the circuit board would have been broken possibly making the opener unusable. I wound up using the old collar with shorter screws. Otherwise installation is pretty easy and everything fits as it should. I did run into a problem getting the bushing off the worm gear shaft due to burrs raised by the original set screws. I used a Dremel and small stone to grind down the burrs and then the bushing came off OK.

Direct replacement

Got the part and was easy to fix and door works great. Thought I would have to buy a new garage door. Not the case.

Only thing more I couldve asked for is for someone to install it! Good job!

Used it to fix an old garage opener, and I was done in less than an hour. It wouldve cost me hundreds of dollars to have ti fixed by a garage repair person, and I did it with just regular tools and a stepladder. If you have doubts, check the Youtube channel, and they have videos on how to do it.