Chamberlain LiftMaster Sears Craftsman 41C4220A Gear & Sprocket Assembly Kit

by Chamberlain

Product Description

Compatible with fail safe units from Liftmaster, Chamberlain, Craftsman, Sears, Master Mechanic and Wayne Dalton. Compatible with 2245, 2255, 2265, 2265-267, PD210, PD212, PD610, PD612K, 1200 Series, 1240, 1245, 1245-266, 1246, 1250, 1250-266, 1255, 1255-166, 1255-266, 1256, 1260, 1260-166, 1260-266, 1265, 1265-267 and more. Not all models listed.

Product Details

• Item Weight: 1 pounds
• Shipping Weight: 3 pounds (View shipping rates and policies)
• ASIN: B00023RTD6
• Item model number: 41C4220A
• Average Customer Review: 4.7 out of 5 stars  See all reviews (287 customer reviews)
• Amazon Best Sellers Rank: #298 in Home Improvement (See Top 100 in Home Improvement)
  • #5 in Home Improvement > Hardware > Garage Door Hardware

Customer Reviews

Most Helpful Customer Reviews

43 of 43 people found the following review helpful:

5.0 out of 5 stars Works like a charm, but what a lot of work it is......., February 23, 2008

By 

Kentucky Reviewer (Louisville, KY) - See all my reviews

Amazon Verified Purchase

This review is from: Chamberlain LiftMaster Sears Craftsman 41C4220A Gear & Sprocket Assembly Kit (Misc.)

First, I wanted to offer compliments to other reviewers that described the symptoms of the gears being bad - the "snow", the stop-and-starts, the stop working altogether but can still hear the motor running - nailed it exactly. Very clear to me after reading those that this was exactly the product I needed. It is exactly what it says it is - an OEM Liftmaster gear replacement assembly. The directions that come with it are excellent - step-by-step, and it explains exactly what you need to do. The directions are the best part of this product - if they were not so well done, it would be impossible.

No knock against the product, but installation was considerably more work than I expected. I had visions of undoing a couple of screws, popping out a gear, putting in the new ones, and being done - boy, I couldn't have been more wrong. The process can best be summarized as "take your garage door opener completely apart, removing all pieces, wires, etc. Around 30 to 50 screws, wires and pieces to remove. Replace gears. Re-assemble." Very important to ziplock and label all pieces and screws as you go, label the disconnected wires with masking tape so you keep everything straight.

With practically no re-work or mess-ups, it took me every bit of 4 hours for the fix. Was starting to wonder if this was the best way to spend my Saturday afternoon or if I just should have bought a whole new opener.....of course, would have had to install that too. That said though, the product works exactly as promised, and the directions are great.

Also kudos to Amazon seller "Sanford and Son" - I ordered it Monday night, was in in mailbox on Friday, in time for the weekend project.

38 of 38 people found the following review helpful:

5.0 out of 5 stars Great Product; Relatively Easy Installation, October 20, 2009

By 

bantcher - See all my reviews

Amazon Verified Purchase

This review is from: Chamberlain LiftMaster Sears Craftsman 41C4220A Gear & Sprocket Assembly Kit (Misc.)

I benefited greatly from comments others made about this product and how to install it, and I thought I'd add mine for any who are looking at getting this. My 11-year-old Liftmaster chain drive garage door opener stopped working and had the same worn out sprocket that so many have described, with the white snow shavings, etc. I too feared I'd have to spend $100s getting it fixed, then I found this great product on Amazon. I installed it last night, the whole process, including finding tools and adjusting the chain and door afterward, took me about 2.5 hours, but the actual removal and installation of the part took only about an hour. Garage door works great now, and is quieter than before.

For the installation, I did what the reviewer before me did, which means I didn't remove all of the stuff the instructions said to remove. Here's a fairly detailed step-by-step of what I did -- my inner and outer "trolleys" (the things that slide the door along the rail and that have the red release handle) were already connected in a good position with the door closed, so I didn't have to adjust anything there: (1) unplug the unit and loosen chain following directions -- I suggest loosening as much as you can -- I didn't at first and had to loosen more to get chain off, which added time to the overall project; (2) remove chain from top of opener unit and attach it to rail so it doesn't fall -- I did this with a plastic tie thing; (3) remove three-sided housing from opener (total of 8 screws hold it in place); (4) unscrew back side of housing (2 screws at top corners), the one that has the circuit board, and let it just hang there (I didn't remove the front side of the housing); (5) remove the white plastic clip and little gear/sprocket from the bottom of the old spindle -- the plastic clip came off by just pulling the front prongs apart a little and pushing it out and the little gear piece just comes down and off; (6) drop the door travel sensor/adjuster thing by squeezing the top of the plastic bracket that holds it where the bracket hooks into the metal plate above it, and let it hang (not sure this needed to be done, but I did it); (7) remove the 3 screws holding the spindle assembly in place at the top of the unit -- this was the "toughest" part and, in part I think because I didn't remove the motor or other parts per the instructions, it was a little tricky getting to the three screws, especially the one nearest the circuit board and a little obstructed by a small bundle of wires, but with patience and care and the right tools it can be done -- I used a small ratchet wrench with an extension (extension was needed for two of the screws) I think the socket I used was 5/16"; (8) remove the old spindle through the top; (9) the screw holes in the new part are not threaded, as others noted, so I threaded them by putting a screw starter (an awl-like device that I think is designed for wood) into the screw holes in the new part and turning it as much as I could and then driving the screws part way into the holes and then taking them out -- all of this with the new part on the floor of the garage; (10)clean the mound of white plastic shavings off as best I could from the metal "shelf" above which the white plastic "screw" is located (like others, I didn't need to replace the plastic screw); (11) remove the white plastic clip and small gear from the bottom of the new part (not sure this was necessary, but I did it); (12) drop the new part in place from the top and screw it in place, being careful to align the square holes for the plastic sprocket cap on top of the unit, front and back, if you want to be able to use that cap -- screwing the new part in place in the tight space with the motor in place was again a bit tough, but doable with patience and care; (13) replace the small plastic clip and gear at the bottom of the spindle; (14) snap the door travel sensor/adjuster bracket back into place in the metal shelf above it; (15) use the supplied lubricant and an old toothbrush to lube up the new sprocket, the old screw and the gear at the bottom of the spindle; (16) plug the unit back in and run it briefly without chain attached to make sure it works; (17) reattach chain and run the unit to see if adjustments need to be made on the door's "travel" -- mine needed a lot of adjustment because it was going down too far on the close and not coming up far enough on the open -- I also put some oil on the chain, the sprockets on either end of the chain and on the rail before running the unit with the chain attached; (18) put the sides back on the unit.

Sounds like a lot, but it's very doable with patience and care, especially in removing the screws to get the old part out, starting threads for the screws in the new part (with the part on the floor), and screwing the new part back in. My socket wrench slipped a couple of times while removing the old part and putting in the new part, but, fortunately, I didn't hit or break any vital part. The only tools I used were a flat head screwdriver, a socket wrench with extension and one socket (5/16", I think), a screwstarter awl-like tool to thread the screw holes in the new part, an adjustable wrench to loosen the chain tension, an old toothbrush to spread the lubricant, a plastic tie thing to secure the chain to the rail, and a small flashlight (the kind you wear on your head) to help me see what I was doing (it was night time and the garage door was shut anyway). Oh, and a ladder. Be careful on the ladder!

21 of 21 people found the following review helpful:

5.0 out of 5 stars It's easy to replace the gear and sprocket. Saves lots of $$$$., October 6, 2008

By 

Scott Newell (Midwest US) - See all my reviews

Amazon Verified Purchase

This review is from: Chamberlain LiftMaster Sears Craftsman 41C4220A Gear & Sprocket Assembly Kit (Misc.)

Certain Liftmaster garage door openers have a plastic gear that is prone to fail after a few years. I had one of those, the 1155. The symptom? You press the button, you can hear the motor running but the chain (connected to the door) doesn't move. When you take the cover off the garage door opener, you can see that it's stripped and white plastic shavings are everywhere.

I asked the local garage door repair company how much they'd charge to replace the gears. About $200. They even wanted $56 for this gear and sprocket set alone. So I ordered it from Sanford and Son for about $30 (which includes shipping). It arrived quickly with a set of well-written and well-illustrated instructions. (There's even a list to check off as you complete each step.)

I'm about average in handyman skills. As I removed each part, I put it on a piece of paper on the floor and labeled it so I'd remember what it was when I had to reassemble it. I followed the instructions exactly, removing the cover, then the motor assembly and then the sprocket and gear set. It truly was easy and took a total time of about 2 hours. It's important to replace the worm gear (Liftmaster's advice) and to apply lots of grease to the gear when you install it.

Now the garage door opener works perfectly, and I got a lot of satisfaction out of repairing it myself. Thanks to Sanford and Son for the excellent kit.