How to change the gear and sprocket in a garage door opener - LiftMaster Chamberlain
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- Опубликовано: 17 июл 2018
- 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. 
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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 thought this was extremely well done. Exactly what I was looking for. Thanks you.
Presto! Just needed this video. Thanks for a thorough, step by step instruction.
I fixed my garage door opener after watching your video. So much easier than I ever thought it would be. Thank you.
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!
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 RUclips provides. Keep up the great work!
Having a "Bam!" moment after finding this video, watching it twice and then completed the gear and sprocket swap myself. Thank you - Saved me $$$, stress and like I said having a "Bam" moment now that it's done and works perfectly.
Thank you so much, this was amazing video,, i have to exchange the gear of my garage door, now i know how to do it,, God bless you Mrs Adam.. from Spring Texas
Adam, there are dozens of RUclips videos about this issue, but yours is by far the best. You take a long time in details, you show some issues that nobody else shows. Thank you very much, your video helped me fix my garage perfectly.
I saved money with this video, almost buy a need system. Spent less than $20 ... Thank you for this video!!
Hi Adam,
My name is Andrew. I just wanted to say thanks a million! Because of your videos I was able to fix my garage door in addition to adjusting the motor once I changed the gear & sprocket! A garage door man was telling me I needed to get a new motor/opener.
Well this is a BIG help as I have the same opener and need to replace the gear set.
Why didn't your opener have 4 pounds of mud dauber nests inside like mine?😂
Repair/replacement after thoughts... Make sure to note the orientation of the drive sprocket cover slots before installing new gear&shaft assembly.
I was mostly looking at the mounting screw holes lining up and didn't notice the two sprocket cover slots until complete with installation and final adjustments. Ugh.
I had already unhooked the chain when I found your video but for the record, MARK THE CHAIN!!! before removing folks. Just like the video shows. Or, you may spend and extra hour plus, getting the chain re-situated. Like I did.
All said and done, +/- $20 for this repair is way better than hundreds of $$ for a new door opener unit.
Thanks again!
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!
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 followed your directions and I was done in 45 minutes, start to finish. Super happy. I just saved 300$.
This is amazing!! Thank you for posting and helping me a DIY fixer!
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! ❤❤❤
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 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.
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.
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.)
This video was extremely helpful! It's saving me the cost of buying a new opener. Thank you!!
Saved us big money in these uncertain economic times- really appreciate it!!
Fantastic, thanks! For $15 and an hour or so of fiddling around, my garage door is back in business!
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!
Thank you so Much for the Video! Life-Saver! Great instructions. Saved myself a couple hundred bucks.
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 especially appreciate the tip about the threading, this video was excellent, thank you Adam
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!
I changed my sprocket with your instructions. Thanks a million.
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.
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'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. 😊
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.
The tip on the lack of threads for the screw it great! Saved me some aggravation knowing that going in.
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!
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!!!
Thank you i just finished. I ran into the chain guide problem as well. 2 screws and back in the game!
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!
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!
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.
Thanks for showing me how to replace gear. A million likes to you!
😞😞 TOO close to the ceiling had to pull the opener down. thank you for the video it went real smooth
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.
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 !
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 :-)
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.
One of the best DIY videos I've watched. Thank you.
Amazing tutorial! Fixed my garage opener's gear shaft myself, thanks to this video.
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.
Thank you.. i just did it with your video 📹 it was so helpful. It saved me $200.00..
Great camera and sound. Great detail. I can't believe anyone needing any other video after watching this one.
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!
Your video saved me from replacing the whole garage door opener. Thanks and well done.
Adam, your tutorial video was excellent. Precise, clear and easy to understand. One of the best I have seen. Really big help, thanks!
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.
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.
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, you saved me over $200 in repairs with this video! These garage repair people are crooks!
Awesome video! You've given me the confidence to tackle mine tomorrow after ignoring the problem for a week. LOL
I finally after two years replaced the gear. One thing I like to point out that even isn’t in the instructions manual. Make sure the two square cut out on the gear assembly is facing forward and back. So if your looking up or down at it. It’s at 12 and 6 o clock. I made the error of being
Off and of course I can’t put the sprocket cover on. I’ll leave it alone for one day I am super bored to redo it all.
Changing the gear was pretty much exactly as shown in the video. Excellent video, Thanks!
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.
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!!!
Awesome content! Very easy to follow and was able to replace fairly quick.
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.
Using the vice grips was a great tip, cheers to you
Thanks man! You saved me a $350 call for garage repair!
just finished doing my garage door opener, followed your instruction, worked like a charm... Thanks adam
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’ve been doing garage door repair for 19 yrs. good video please use 2- 1/2 wrenches on the chain , keep from stripping the nuts
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 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!
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.
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 🪱
Fantastic.... I just ordered the kit from Amazon... Thank you !!
You just save me a lot of money my friend thank you so much 👍🏻👍🏻👍🏻
Great video, you probably just saved me a couple hundred bucks. Instead, it cost me $21 online and a few hours. Works great!
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!
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!
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.
Great informative video without a bunch of bs.
Bro. You saved me so much time and money. This video is flawless. THANK YOU
This just saved my life today! Thanks
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!!!
Great video...the only thing I missed was aligning the gear so that the cover matches up with the holes.
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!
Thanks for the video, I was able to identify and fix the problem.
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!
Great video saved me $200+ took me about 45 mins and $25 for the parts on amazon.
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
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.
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!!!!
I have a 2003 unit identical to the unit in your video. After replacing the worm gear and sprocket (my sprocket had broken off) now the inner trolley runs backwards toward the door. Of course if I have the 2 trolleys connected pressing the button which opens and closes puts a big bow in the rail until the trolleys return. I am baffled. The only wiring I had disconnected in the repair was the multi-wire plug to the logic board.
Update:
I found the answer. Before you put the chain on, run the sprocket clockwise if you are looking down on it until it is in the ‘door down’ position; then attach the chain.
.. That's a good tip to remember .
Glad you figured it out ,,,, and posted on how to fix . 👍 .
Excellent video. If I knew it was that easy I would have just replaced the gear instead of the whole box.
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.
Thank you for an awesome video, I could fix mine in about 90 min. You explain better than all other one.
great video. Your suggestion to pre-thread the screws probably saved me hours!
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.
Thank you for helping me save some money, your video was perfect!