How to change the gear and sprocket in a garage door opener - LiftMaster Chamberlain
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- เผยแพร่เมื่อ 10 ก.พ. 2025
- 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:
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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.
Adam, there are dozens of TH-cam 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.
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!
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.
Thank you for the video. Have the same model, had the same problem. This video helped immensely. The one thing I recommend at the nd is to have the starting point @9:55 with the door all the way down on the floor and disconnected from the chain, run the chain to the closed position, then connect the door to the chain , so you don't have to worry about the limits, at least one of them.
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 TH-cam provides. Keep up the great work!
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.
Thanks for the tips
I need to change the other gears also
I fixed my garage door opener after watching your video. So much easier than I ever thought it would be. Thank you.
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.
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!
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.)
Thank you! With a help from my friend we were able to fix the garage opener. Too bad we miss replacing back the gear shaft in a way that the sprocket cover is parallel. We fixed it but too late to redo the shaft assembly. But now it works!
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.
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.
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!
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
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.
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. :)
I followed your directions and I was done in 45 minutes, start to finish. Super happy. I just saved 300$.
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!!!
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.
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! ❤❤❤
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!!
I saved money with this video, almost buy a need system. Spent less than $20 ... Thank you for this video!!
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.
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 !
Excellent video! made repairing my Craftsman door opener a breeze and saved me several hundred dollars. My 1999 Sears Craftsman has a new life!
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. 😊
Thank you so much mine is the same as yours I think made in 2006. it just broke today. I thought I had to buy a whole new liftmaster. thanks!!!
Just used your video and it was so helpful in fixing my garage door. I wasn’t as lucky as you when I came to the limits, but after a few quick adjustments, it was good to go. Thanks again!
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!
Every detail covered? what about replacing the worm 🪱
This video was extremely helpful! It's saving me the cost of buying a new opener. Thank you!!
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!
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!
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.
Thank you so much for your video. After buying the parts, I found this and everything went perfect. I have a working door again! Your details were very appreciated!
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
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.
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!
very helpful video. it was super easy to change the gear. one thing I will also cover that I have to look for in another video is what to do if the gear breaks and how to position the chain. I didn't know the motor tries to close the door instead of open it. so I position my chain in the close position. after some more research all I had to do is disengage the chain press the button on the wall and hit the sensor. that way the motor opens the door. after that I position my chain in the open position. thank you so much for you video was very helpful.
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.
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.
Saved us big money in these uncertain economic times- really appreciate it!!
I changed my sprocket with your instructions. Thanks a million.
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!
Fantastic, thanks! For $15 and an hour or so of fiddling around, my garage door is back in business!
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.
just finished doing my garage door opener, followed your instruction, worked like a charm... Thanks adam
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.
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 :-)
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!
I especially appreciate the tip about the threading, this video was excellent, thank you Adam
great and informative. I have a Raynor 1/3 hp and could not find a kit for it, so i used this one. looks and fits just like the liftmaster. probably made by the same folks, but i could not confirm it with a google search. And this did happen in the winter.
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!
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?
Amazing tutorial! Fixed my garage opener's gear shaft myself, thanks to this video.
Awesome video! You've given me the confidence to tackle mine tomorrow after ignoring the problem for a week. LOL
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!
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.
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!!!
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.
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.
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.
Your video saved me from replacing the whole garage door opener. Thanks and well done.
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!
Adam, your tutorial video was excellent. Precise, clear and easy to understand. One of the best I have seen. Really big help, thanks!
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!
The tip on the lack of threads for the screw it great! Saved me some aggravation knowing that going in.
Just changed my gears. This video was excellent for showing exactly how to do it. Thanks so much for sharing.
One of the best DIY videos I've watched. Thank you.
Great camera and sound. Great detail. I can't believe anyone needing any other video after watching this one.
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)
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.
What did young homeowners do before TH-cam… thanks! This video saved me a bunch of money!
What most homeowners young did they called a professional are at worst bought a whole new system
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!!!!
Changing the gear was pretty much exactly as shown in the video. Excellent video, Thanks!
Thanks for showing me how to replace gear. A million likes to you!
Thank you Adam for posting your video. I am going to do the replacement of gear system myself instead of calling the garage door repairman. Thanks again.
Watched your video a few times and then the tackled the job. All went well, it did not take long at all. Only one suggestion, I did not know the new assembly had to line up so you could attach the sprocket cover again. Oh well. Great tutorial, saved me a ton in service charges.
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!!
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!!!!
Thanks for the video. My opener had shims on the shaft when I put it together it made a horrible noise without them. The kit came with replacements and once they were in stalled it ran much smoother with minimal noise
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!!
Bro. You saved me so much time and money. This video is flawless. THANK YOU
Thanks Adam. Parts were $22 and I saved a ton on labor by doing it myself. However, it took me much longer than it did you in your 11 1/2 minute video. LOL!!!
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....
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!
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!
Great video saved me $200+ took me about 45 mins and $25 for the parts on amazon.
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.
Thanks
Perfect video. You saved me lots of time and made the job super simple. Thanks for what you do.
Thanks man! You saved me a $350 call for garage repair!
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
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.
Great video, you probably just saved me a couple hundred bucks. Instead, it cost me $21 online and a few hours. Works great!
Awesome step by step instructions, just fixed my garage door opener by myself with no issues!
Thanks so much for the video. Was able to replace the drive gear on the garage door opener in a couple hours.Only cost me $40 for the parts.
When installing the gear assembly, I did not notice that it has a particular orientation in relation to the 3 screw holes. The slots must be front to back as seen at 7:06. Mine were 120° off and I could not install the top gear cap. (Off it goes again.) Thanks for the video.
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!
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.
Thank you so much, I fixed my garage door by my self whit you helped , bless you man. I live in Idaho and here is so expensive that work, thank you!!!
Thank you i just finished. I ran into the chain guide problem as well. 2 screws and back in the game!
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.