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
-------------------------------------------------------
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.

[@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!

[@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!

[@fosgatexlt]

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

[@piromchai]

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

[@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.

[@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 !

[@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!

[@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)

[@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. :)

[@atlmogul1]

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

[@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.

[@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

[@alicefernandes2159]

Excellent tutorial video Adam! I did run into one problem thou. You don't mention to align the tabs for the chain sprocket cover parallel to the chain. It was not until I went to put the cap back on at the very end that I realized the problem. You might want to add this to your video. Thanks!

[@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!

[@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!!

[@toms5312]

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

[@samanthastichter2566]

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

[@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!!

[@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.

[@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.

[@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?

[@ninjacricket79]

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

[@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.

[@greghudson1489]

Well this is a BIG help as I have the same opener and need to replace the gear set. Why didn't your opener have 4 pounds of mud dauber nests inside like mine?😂 Repair/replacement after thoughts... Make sure to note the orientation of the drive sprocket cover slots before installing new gear&shaft assembly. I was mostly looking at the mounting screw holes lining up and didn't notice the two sprocket cover slots until complete with installation and final adjustments. Ugh. I had already unhooked the chain when I found your video but for the record, MARK THE CHAIN!!! before removing folks. Just like the video shows. Or, you may spend and extra hour plus, getting the chain re-situated. Like I did. All said and done, +/- $20 for this repair is way better than hundreds of $$ for a new door opener unit. Thanks again!

[@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.

[@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.

[@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.)

[@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!

[@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.

[@rgutier14]

I saved money with this video, almost buy a need system. Spent less than $20 ... Thank you for this video!!

[@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.

[@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!!

[@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.

[@briangenelinn44]

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

[@swimjigman953]

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

[@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!

[@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.

[@Psychmart123]

I just wanted to thank you for this video! I had quotes ranging from 250 to 850 to fix this $16.00 issue. Thanking God for u! ❤❤❤

[@noble3145]

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

[@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.

[@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!

[@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.

[@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!

[@Grassfed_Adam]

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

[@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

[@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!

[@mattland828]

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

[@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.

[@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!!!!

[@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.

[@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!

[@derrickstephens7195]

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

[@dmandamnit]

Thank you i just finished. I ran into the chain guide problem as well. 2 screws and back in the game!

[@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!

[@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!!!

[@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!

[@mrsameenkhan]

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

[@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. :)

[@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

[@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.

[@nharp83]

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

[@whatthe2458]

😞😞 TOO close to the ceiling had to pull the opener down. thank you for the video it went real smooth

[@ppvshenoy]

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

[@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!

[@chrisa.8175]

Thank you.. i just did it with your video 📹 it was so helpful. It saved me $200.00..

[@chadguru9565]

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

[@joshjenks524]

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

[@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....

[@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!!!

[@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.😮

[@roguewolfinc]

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

[@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

[@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!!!!

[@averellsaldanha9402]

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

[@g.n.6471]

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

[@stanflora8692]

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

[@jimmeacham7711]

Good tip on marking the chain, that way you are close. I had to make several adjustments up and down. Another good tip you mentioned was don't let it hit the nut and bolt. I think mine got out of adjustment and wala, it hit the bolt and busted the gear.

[@kaivankhan]

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

[@KJC63]

I'll be doing this tomorrow. My gear and cover flew off 😂 . Just waiting on the part to arrive. The chain is now hanging. My opener looks just like your's. I'll be using your video as my personal tutor. 😊

[@michaellicavoli3921]

Just looked into opener and found metal particles all over the grease on the large gear. I was going to ask, but you answered that question right off the bat…thanks!

[@halsmith4951]

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

[@rickworkman3743]

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

[@Ashleyyy414]

Woooo! Thank you for this video. Was able to get this job done rather than a call-in to the local repair person! I took probably 5-10 times longer than you, lol, but I did it!

[@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.

[@J_415_]

Thank you so Much for the Video! Life-Saver! Great instructions. Saved myself a couple hundred bucks.

[@sivrid1331]

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

[@jonk1969]

Fantastic, thanks! For $15 and an hour or so of fiddling around, my garage door is back in business!

[@johnvincent527]

I thought this was extremely well done. Exactly what I was looking for. Thanks you.

[@evilmindreader]

Thanks a million. Just fixed my garage door opener for just $18.95. Hate to think what I would've paid an pro in 2022.

[@MrMiamiFresh]

Thank you for pointing out that we should tap the screw holes beforehand. You saved me from flying off the handle if I wouldn't of otherwise.

[@sharabi21]

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

[@ricardos4277]

The tip on the lack of threads for the screw it great! Saved me some aggravation knowing that going in.

[@novawombat84]

Great video, it helped me a lot to repair my older lift master garage door opener! I only made one mistake, I didn’t properly align the two square holes on the top of the housing ( which holds the top chain guard), so I had to redo it. You’re other video helped me set the limits properly, thanks again for saving me money on this repair Adam!

[@nicolepalermo3745]

Thank you so much for the excellent video quality. You kept a good pace and explained everything so well. I was able to do this repair and am thrilled!! 🎉

[@AnhTuan-fz6go]

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

[@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!

[@weeweed86]

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

[@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 :-)