How to change the gear and sprocket in a garage door opener - LiftMaster Chamberlain

This gear kit on Amazon: amzn.to/2uwVNKj
I'm working on a chain drive opener. If yours is a belt-drive you need a kit like this amzn.to/2zQnS4o (note the difference at the top). Remember to balance your garage door before doing this repair or at least test the balance to see if it is ok. I have other videos that show how to do that and I included the links to those videos below. After you are done replacing the gear and sprocket you will want to test and adjust the limits. The limits tell the opener how far you want it to open and how far you want it to travel when it closes. Again, I have a video on how to do that. See below.
How to Balance a Garage Door: (uploading this one soon)
How to Adjust the Limits: • Garage Door won't stay...
My garage door Troubleshooting video: • Garage Door Opener Tro...
The repair in this video will work for these kits for chain drive openers:
41A326-1, 41A5585, 41A5585-1, 41A5668, 41C4470, 41C4220A and 41A5658-1 As well as these Belt Drive kits 41A4885-2 and 41A4885-A
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How to contact me:
My Patreon page→ / adamdiy
Email and mailing address on the About page:
/ adamdiy
Disclaimer:
This video is only for entertainment purposes. Any injury, damage, or loss that may result from improper use of tools, equipment, or from the information in this video is the sole responsibility of the viewer and is to be used at the discretion of the end user/viewer and not AdamDIY and or Adam Hill. If you are uncertain about any step of the process or feel unsure about your skill level, seek a more authoritative source.

[@ricklee993]

Thank you so much! This was exactly my problem and the fix worked perfectly. $20 and an hour of my time. Didn't even swear too much or throw anything. Excellent video. Thanks again!

[@markpigliavento2951]

Adam, I want to thank you for this video. I followed your instructions and ordered the part from your link. I was able to fix my opener in a little over an hour. You are a perfect example of the good that KZbin provides. Keep up the great work!

[@thaddeusbeier]

Adam, there are dozens of KZbin videos about this issue, but yours is by far the best. You take a long time in details, you show some issues that nobody else shows. Thank you very much, your video helped me fix my garage perfectly.

[@martinbarrett2635]

Having a "Bam!" moment after finding this video, watching it twice and then completed the gear and sprocket swap myself. Thank you - Saved me $$$, stress and like I said having a "Bam" moment now that it's done and works perfectly.

[@derricklee5695]

Thanks, Adam, totally helped me replace my sprocket assembly. I definitely appreciate all of the tips that did NOT come along with the instructions (such as locking down the chain adjuster mechanism, marking the chain, and pre-drilling the holes in the mount)

[@atlmogul1]

Just changed my gears. This video was excellent for showing exactly how to do it. Thanks so much for sharing.

[@fosgatexlt]

I fixed my garage door opener after watching your video. So much easier than I ever thought it would be. Thank you.

[@MarkM-xd2zo]

I'd ordered the gear and sprocket last week and it arrived a few days ago. I took the time to watch this video before attempting the job and must say it made all the difference! Thank you SO MUCH for all that you do, I now have a function door opener again and saved over$300 by doing this myself. You are much appreciated. :)

[@lukasgriffith5933]

Thank you SO MUCH for posting this very well made video. I purchased the exact same gear kit for my Craftsman opener that broke shortly after we moved into our new house (and in the winter no less). I watched this video a few times in preparation and then step-by-step while replacing the main sprocket, which had initially broken completely off, and it went about as well as I could have hoped. Watching this video was much easier than reading the vague instructions that came with the kit. Thanks again!

[@NorseOutdoorsMan]

Thanks for the great information!! My dad’s opener just stopped working on him, we took the cover off and saw that main gear was totally shot. He order the parts kit for $26 and it took us less than an hour to get it fixed today thanks to your great video!!

[@squire414141]

Thx for this vid. I repaired my opener for $30 and 1 1/2 hrs of my Saturday. By far, yours is the most thorough directions.

[@kevinlyons9273]

This video is amazing. I just changed the gear and sprocket in my garage and this video was perfect. Every detail is covered and there are a few tips / tricks that the video covers as well that make it easier (threading the screws, etc.). Thanks so much for posting!

[@a1sauce44]

Every detail covered? what about replacing the worm 🪱

[@timoberg4702]

You, my friend, know how videos are made, and you did a great job on this one. Good lighting, audio, and closeup details and information. Edited the turning screws and other minutia for time. Very helpful! Thanks!

[@toms5312]

An excellent tutorial. Much easier to follow than the directions in the package. Thanks very much Adam, for your videos.

[@dave7064]

This video was terrific! I just changed the gear and sprocket in less than two hours and it is working well. Your instructions were spot on!! Thank you!

[@annabellejonesify]

Matt Vaughan Matt Vaughan Dude, can you help me? I got all excited seeing how easy it was to change that chain gear. I just replaced the gear assembly on mine because the teeth on the old one completely wore off. Now, whenever I hit the garage door opener button, the motor and chain goes 3” one way then 3” back the other way and stops. What would the problem be?

[@MrNelgom]

I just replaced the gear and sprocket thanks to you. Thank you for taking the time to explain this step by step. Very much appreciated.

[@mrichardson428]

perfect tutorial Adam! You provided an easy solution in getting my 1/2 HP Liftmaster pro back in operation pronto! Your tip to thread the gear mount prior to install was absolutely brilliant! You can count me in as your latest subscriber, thank you !

[@g.n.6471]

I like when I’m working and done a project I can say with confidence, “Perfect!”

[@bhf930]

i am amazed at how many people had the same exact problem and how many people loved your video. Add me to the list. Unfortunately, i took the motor unit down before seeing the video, but you still taught me how to put it back together. So, i really appreciate your help and thank you for it.

[@jimsnellen6222]

I have to agree with Danimal1173! Finding this video saved me a LOT of work. I was preparing to remove the unit so I can work on it on my bench. I now know I can fix it in place using a gear kit. Wonderful!

[@mah1634]

Adam, thanks for your step-by-step videos. I'm helping a family member overseas (while visiting) with this exact gate opener. I was able to fix gear n chain problem with your help!! Keep up the good work with the videos - great instructor!!

[@patlorenz2987]

Adam, Our door works like a charm and thanks to you and the video. We had to go through the process twice as when we were putting the plastic cap back on, the holes did not line up. Had to take it all apart and works great. We watched the video several times and didn't remember that part. Great job explaning.

[@mikeclark5898]

Just ordered the gear kit and installed it,now Im off to your limit switches video!Thank you so much this video helped a ton!!

[@ppvshenoy]

Thank you for your video. I managed to order the right parts and install. Garage door is working perfectly. Thanks again. Much appreciated.

[@garylafollette6862]

Just fixed my garage door opener using this video. Thanks for posting!! One tip from me is to grease everything after installing because working in the tight space, I wound up getting grease all over the tools I was using. Thanks again for the instructions!!!!

[@Doobilicious99]

Thank You! I’m not so inclined in this area things, but I watched your diagnostics video and this one, and I was able to get it all done within a few hours. :)

[@weez1736]

Thanks for the help, worked great! $18 in parts and only took me an hour. Fixed a lot of things, but this was a first.

[@omerorocha9816]

Thank you so much, this was amazing video,, i have to exchange the gear of my garage door, now i know how to do it,, God bless you Mrs Adam.. from Spring Texas

[@giovannifuentes138]

I'm in process fixing the garage and let me tell you, you are the best on you tube, for this thank you!! You save me a lot of money.

[@jcgraphics3d]

Thanks, Adam! I just changed the gears in my ancient opener, and it is working great. I think this may be the original opener for this 28 year old house!

[@geoffreyweiss3848]

Thank you! I bought the GarageStop kit on eBay and installed it using this video as a guide. The garage door opener is working again! (2 different garage door specialist companies quoted me "estimates" between $575 and $1099.)

[@bandit0729]

Thanks Adam. Great video and yes, i am having to do this in the dead of winter...in Minnesota! But now I know EXACTLY what to do and good tips on minimizing the adjustments

[@kevinclancy.]

Very helpful video, thanks so much. The tip on cutting the threads in the new housing while it's out was worth gold, as I'm sure I'd be cursing up a storm if I didn't do that.

[@Grassfed_Adam]

I especially appreciate the tip about the threading, this video was excellent, thank you Adam

[@swimjigman953]

just finished doing my garage door opener, followed your instruction, worked like a charm... Thanks adam

[@mattland828]

Awesome step by step instructions, just fixed my garage door opener by myself with no issues!

[@robertburckle7659]

Excellent tutorial Adam. The pro tips saved a lot of time. My garage door opened perfectly on the first try. No adjustments necessary! Thank you!

[@derrickstephens7195]

One of the best DIY videos I've watched. Thank you.

[@shespelt]

Winter? You bet. My gear just went (replaced the other door's gear drive assembly in Feb 2015), 26 years was a good run. Definitely time to balance the doors - springs are probably 10+ years old, I remember replacing them at least that long ago. Only comment is that when placing the assembly in, rotate the assembly to line up the 3 cap screw holes with the gear just above the worm gear, so you won't have to turn the gears just to get the holes lined up for screwing the 3 in. That much I remember from Feb 2015. Great video - excellent clarity, great tips. Many thanks for posting this & doing an A+ job with it.

[@ronstar8857]

Thank you so much for an outstanding video. My Liftmaster died last night. Luckily, yours was the first video that I watched. VERY well explained as well as shot. I am going out today to get a new gear assembly. I'm sure that your video saved me a couple of hours as well as a few bad words. Cheers!

[@kathymurrayhealthyliving3176]

THANK YOU so much for this video. I had never tried anything like this before. I'm not very handy. My door stopped working and I realized the sprocket had snapped off, separated completely from the gear shaft. No wonder the chain wasn't moving. Other than being a very old unit, I believe I found the reason for the stress. Anyway, I ordered the replacement part and then followed your instructions perfectly. You gave so much information that I wouldn't have had a clue about.. .like threading the screw holes. I got the new gear and sprocket replaced and greased up. The door still wouldn't function properly though, the adjustment screws weren't having any impact. No matter how much I turned, the door did the same exact thing every time. I finally figured out that a sensor (yellow wire) had come off the up adjustment screw. I got it back on, made the proper adjustments, and it WORKS PERFECTLY!!! Thanks again for saving me money AND for helping me gain a big boost in the accomplishment department! I'll always check here first whenever there's something around the house that needs to be done

[@johnwhitney8444]

Kathy, please see my post on 8/29/20. How did you realign you chain? This seems to be a no-brainer video. Thanks Adam. i had my doors replaced about three months ago and not sure the installer checked the balance.

[@ninjacricket79]

I followed your directions and I was done in 45 minutes, start to finish. Super happy. I just saved 300$.

[@marcdesaulniers7258]

Super, changed gear, everything perfect. Thanks for your help.

[@Danimal1173]

Awesome video! mine broke this morning and you just helped me out BIG TIME. I'm going to look for instructional videos you have on balancing the door in case that's an issue i need to address also.

[@weeweed86]

Thank you....This is the best how to for these openers I have seen.

[@nharp83]

Great camera work with clear and concise information. Thank you, Sir!

[@rickworkman3743]

Excellent presentation. I'm sure after watching one more time I can do this myself safely and save big bucks.

[@ninoresto9555]

Thanks Adam this video was great.The lighting, the angle view and information was perfect. The only thing you didn't do was inform viewers on where you got your replacement or where we can acquire piece, but as far as installation and tips were precise . Now to find my part and get to it!

[@CosmicFishbowl]

Thanks for putting together such a well produced and easy to follow video. I just fixed my garage door after watching this. The hardest part, by far, was getting those three screws out.

[@johntolliver2012]

Thanks

[@mrsameenkhan]

Great camera and sound. Great detail. I can't believe anyone needing any other video after watching this one.

[@BruceAlanR]

Great camera work and easy to follow! You covered everything. Thanks!

[@averellsaldanha9402]

I changed my sprocket with your instructions. Thanks a million.

[@sivrid1331]

Changing the gear was pretty much exactly as shown in the video. Excellent video, Thanks!

[@stevemueller6531]

Adam, you did an excellent job on videoing, trouble shooting and explaining how to fix a garage door opener with this issue! The plastic gear was the issue with mine so I replaced the entire part like you recommended. Thanks much, Steve

[@chadguru9565]

Amazing tutorial! Fixed my garage opener's gear shaft myself, thanks to this video.

[@EdgardBermudez]

Thank you very much for this video... I followed your instructions step by step and I was able to replace the gear & sprocket (Amazon = $18.00) in about one hour, I took my time watching your video while I worked. I have the exact same garage opener, but the top had a black plastic chain guide with 2 screws that came with mines I had to remove, I did not see that on your video...but anyhow thanks a million!!!!

[@jeremytaylor1773]

Thanks, Adam! Your video covered everything to replace the gear and sprocket on my Craftsman garage door opener that broke in the way you illustrated. The step for creating the threads for the screws was particularly helpful. If I hadn't known to do that in advance, I really would have SCREWED that up. Waaaah waaaaah....

[@pauldrake7638]

Excellent video! made repairing my Craftsman door opener a breeze and saved me several hundred dollars. My 1999 Sears Craftsman has a new life!

[@toshimusic]

Great video!! Good detailed instructions!! Made my repair easier and quick. The part number was a big help. I'm doing this repair during the winter too.😮

[@noble3145]

Adam, your tutorial video was excellent. Precise, clear and easy to understand. One of the best I have seen. Really big help, thanks!

[@sharabi21]

Clear, concise, informational/educational and great presentation ! Thanks.

[@48Marlon]

Thanks for sharing this, Since I appreciate protecting myself from unnecessary & willing to take on certain projects, I save where ever I can & This helps me to do just that.

[@scottnerger2362]

Just wanted to say thank you for this video. I am not at all good at home repairs, but after watching this video a couple of times, I was able to successfully make this repair myself.

[@kileshwor]

Yes, really it was great help for me. Me and my son together followed your video and successfully changed the sprocket. We had ordered the Gear Kit-A X1 sprocket from Amazon. Hope it will work for longer. Thank you Adam.

[@6fivenick]

Thank you so much for posting this!

[@roguewolfinc]

Your video saved me from replacing the whole garage door opener. Thanks and well done.

[@chipmeister111]

Nailed it with this guided tutorial. Thanks for the help.

[@halsmith4951]

Thanks for such a good, easy to follow video and instruction. Fixed mine today right before the big cold snap. Appreciate you!

[@lukeehgoetz3925]

Hi Adam. Watched this video and got this part and did the repair. Way easier than I was expecting. This video saved a lot of time and money!! Thanks!

[@andreachouprouta3034]

You are so good at explaining things!!! I have the same problem and was going to buy a whole new garage door opener until I found you! Thanks!!!

[@tdemask]

I just replaced the gear and sprocket in my 10 year old Chamberlain 1/2hp chain drive opener, and this video was a huge help! Thanks! I would add that in my case, it seemed that once it was all back together the opener seemed to think that the door was in the up position, when it was in fact closed. The only way I could get it to work was by manually moving the chain to where the door would be in the up position. Then after a few tries readjusting the down limit, it all works perfectly. Great super helpful video!

[@aplleyva]

Very thorough and great comprehensive and informational video. Thank You

[@AndrewTaylorJr]

Hi Adam, My name is Andrew. I just wanted to say thanks a million! Because of your videos I was able to fix my garage door in addition to adjusting the motor once I changed the gear & sprocket! A garage door man was telling me I needed to get a new motor/opener.

[@jamesr.dubose6469]

Adam - your video is simply the best! I followed your tutorial and the job came out perfect. You saved me time and lots of money.

[@nrpardee]

One more "Thank you" for this useful video. As such videos go it's extremely well done, mostly just the essentials, no longer than it needs to be and no shorter. The one thing I wish is that your other video on adjusting the chain included what to do if you couldn't mark it or it somehow got messed up. We figured out how to get through it, though. Thanks again. PS. This was on a weird opener that had a red/orange learn button, but responded only to a green remote. Something went terribly wrong during manufacturing through when my sister's family had it installed.

[@KrashmanVonStinkputn]

Outstanding video. My son and I bonded over this repair project. The only issue we ran into was our sprocket had sheared off completely causing the chain to hang to the floor. This caused the up/down limits to be completely thrown off. (The garage door "thought" it was up and was trying to go down when it was already down) We left the cover off to make the adjustments to the up/down limits. We had to pull off the small gear with the E clip and manually reposition the gear on the switch drive shaft that it interfaces with. (Disengage Door, start trolley and stop it about half way then manually turn the switch drive shaft to approximately half way point to match where trolley is) We could then adjust the UP/DOWN limits until it worked properly.

[@samanthastichter2566]

This is amazing!! Thank you for posting and helping me a DIY fixer!

[@johnnyg3681]

Yes by far the best. I've watched a bunch of garage door videos especially openers and you do the best job of showing and explaining things. One comment is explain what you mean by if your garage door is out of balance. You mentioned it just briefly. Thanks Adam...I subscribed!

[@ReturnOf_JFR]

I just fixed my garage door opener....this video covered everything.

[@kaivankhan]

Great video, I like how smart you are with the work, marking things and pre-threading, great work

[@MrJrock8106]

I really appreciate this video,it was so simple in the explanation and straightforward..thanks again this was a big help.

[@boomerbob3175]

This is a really good video. I replaced my gear sprocket assembly and everything is working again. It wasn't quite as easy as the video depicts but the video provides a lot of tips which will save you a lot of aggravation. My biggest trouble was getting the old assembly out and the new one installed because I didn't have the right tools for the job. The only thing that I was not able to install was the cap that goes over the chain sprocket because if you don't install it with the slots facing the right direction you can't put it on. No big deal though. All in all this saved me hundreds of dollars! Thanks for a great video!

[@Zhuyou]

Fixed my garage with this. And the adjustment of the chain and limiter was critical as my garage door wasn't closing all the way afterward and were hitting the know when open all the way. Thank you!!!

[@piercecushenbery5876]

thanks for the share buddy. saving the day for all the suburb diy'ers

[@rodmiller1556]

By far the best video on this repair. Thanks

[@piromchai]

Thank you. You are a good teacher. You make it simple.

[@paulcarncross3359]

Just got through installing gear and sprocket using your video thank you it was very helpful.

[@JR-zw2vb]

Presto! Just needed this video. Thanks for a thorough, step by step instruction.

[@AnhTuan-fz6go]

Thanks for showing me how to replace gear. A million likes to you!

[@wdrdiyman1674]

Have performed this task twice now. A few more bits of information: 1] cover screws are 1/4-inch; 2] chain anchor nuts are 1/2-inch; 3] sprocket mount screws are 5/16-inch; 4] check bolts holding entire unit to ceiling....1/2-inch nuts; 5] chain is heavy..be very careful of fingers when moving it on and off of the sprocket...potential for injury; 6] using both the Vice-Grip trick and marking chain position, it was necessary to adjust limits......door always moved too far up and didn't move down far enough....so I would adjust both limits before first functional test by one full turn [360 degrees] and definitely perform the safety test. Also make sure that you have not loosened/detached the black sector wheel which mounts on the outer end of the worm gear shaft while messing about. Pre-threading the sprocket mount screw holes is pure genius...do it !! Worst parts: many trips up and down ladder & gooey grease.

[@marctrossbach6560]

Thanks for the tips

[@montebates9298]

I need to change the other gears also

[@rodneyyoung8215]

Thanks .... I just changed the sprocket and gear set on my craftsman garage door opener everything was right on point very easy to do even if your a do it yourselfers save me 💰💰💰

[@cheesetopher8591]

Great video saved me $200+ took me about 45 mins and $25 for the parts on amazon.

[@joshjenks524]

Saved us big money in these uncertain economic times- really appreciate it!!

[@mikemurphy5896]

Thank you, great instructions! Saved me $$$. One thing I didn’t notice till the end was the openings on the top of the sprocket that seat the black plastic cap prongs. After screwing in the all the bolts I went to put the cap on and realized I should have rotated the two openings so the cap would not interfere with the chain, so no cap on mine :-)

[@MrBryanwithay]

Thank you sooooo much for this video, made the gear and sprocket replacement easy peasy!

[@briangenelinn44]

This video was extremely helpful! It's saving me the cost of buying a new opener. Thank you!!

[@stanflora8692]

Bro. You saved me so much time and money. This video is flawless. THANK YOU

[@chenlim2165]

Very helpful and clear instructions, thank you! Just finished this replacement in a couple hours. That third inner bolt is a pain indeed. On mine it was an 8mm bolt (1/2 HP Sears), so make sure you have a socket wrench before you start. There isn't much clearance.

[@slmiller35]

Great video. Great quality. Very helpful. Ordered the part online and will tackle in a few days.

[@comonbabylightmyfireburn]

Yes another great detailed repair. Thanks