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

worked well on my Sears 1/2 HP opener, Saved over a hundred bucks by doing my own install

Excellent the correct part as described.

Watched countless u-tube videos for install. Caught up on door going down without stopping. Reread instructions and one small sentence told me I needed to set the garage door opener without the chain clockwise to the end of cycle. Thank you Amazon

Eighteen year old Sears garage door opener gear snapped off. Ordered this replacement part. Used YouTube video instruction to remove old part and replace with new one. Replacement part looks just like original and fit fine. Fairly straight forward installation with no issues. Works great and saved me $$ from having to call a repair shop.

Right part, fast shipping

Just what I needed to repair the door opener. Design of my Lift Master opener was close quarters to remove the three screws holding the round plate shown in the product picture. There are extra bushings and gears to save on top of the opener for the next time if problems appear. Before putting the chain back on, be sure to run the door opener so the sprocket turns clockwise. This is the door down position. Also in my case there are adjustments on the side of the case for up and down TRAVEL and an additional two adjustments on the wiring side of the case for objects BLOCKING the door travel. After putting the chain on the sprocket but RELEASING the door from the travel slider, operating the door opener the chain traveled too far back and hit the stop, hard. So I had to turn the open door adjustment a couple revolutions on the side of the box to stop the chain from advancing too far. Then the close door travel had to be adjusted, this time with the door attached to the slider. I had a helper pushing the door button while I stood ready to pull the power plug during the adjustments if something went wrong. The initial gears lasted ten years and it appeared the bushing only had failed.

Had what I needed to fix a worn assembly.

Works great, shipping was fast,Thanks

Installed and worked perfectly in my M55 Liftmaster. Easy to adjust door travel to seal when it closes. Would recommend to anyone with good handyman and electronic skills. Saved me over $300.00 installing this part myself.

My opener is now quiet again. It does take time to replace it. But the instructions made it easy. This is the 2nd one I have done over the years. The first with another Chamberlain/craftsman opener. The same part at Sears parts was $20.00 more.