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

Listing and the pictures of the parts shown on Amazon are exactly as shown! I used it to fix my Craftsman model 13953990. Note that it DOES need slight modification to fit it. I had to grind off the edge of the housing that holds the chain drive gear. It needs a flat edge to fit. Also note the chain drive gear is SMALLER, but works fine since this gear reduction gives it more lift power, but makes it slightly slower to open. Note this gear difference requires to you adjust the door OPEN/CLOSE switches due to the gear making more revolutions, the Open/close switch positions are farther apart. I suggest placing door chain at the door open position then set switches on that worm gear to have more travel between them. I also noticed that due to smaller gear, the chain rubs more on the chain guide.

Exactly what I needed, the gear was worn out so garage door wouldn’t open or close. Easily replaced with this part as it comes assembled, hardest part was trying to get to the screws. Product came as pictured and exactly what I needed so definitely happy with this.

Kit delivered in timely manner which is a plus. Parts fit as needed. Once installed, a few adjustments were required to calibrate closing. All functioning well with new components.

Chain too tight or long time wear cuts the shaft right off. Not hard to install either. Did not bother with some "extra" parts. Dropped in with a few screws. No problemo.

It’s easy. Don’t buy just the gear. I only use the main assembly. I messed with getting the pin out of the old one for a bit, but it just wasn’t worth it for the price of this kit. I already had some taps with the pilot drill attached to the tip from Amazon. They cost about as much as the kit, but they’re great to have around if you don’t lose them. they’re only meant for a quick small project not repetitive use use them two or three times and it was worth it just for a convenience. You should try Mark where the shuttle is on your track. I didn’t count the teeth on the replacement…. But after I had it all set up, I had to loosen the chain again and move it so that it was within the range of the adjustments for up and down. Really not that big of a deal. The holes really should already be tapped though it only takes four or five minutes tops..

This rebuild kit is perfect to replace the Drive gears and shaft for my older Craftsman garage door opener. This kit gives you everything you will need. No instructions included, so you will need to look on YouTube if your not familiar with the installation of these repair parts. Very impressed with the OEM quality of these parts and would buy again if needed.

Great Price, Fast Delivery, Would buy Again!

Excellent replacement for my 1998 Craftsman Liftmaster garage door motor (139. 53675SRT2). Easy to install and was an exact fit.