Saved me today,. I didn’t know how bad it would get out of alignment just by changing the chain gear and shaft. Thank you very much.

I'm adding to the list of thank yous. I spent a lot of time searching for information. So many videos on how to set travel limits when the limits are only a little off, and hardly anything on when the adjustments aren't functional. This was perfect! Exactly what I needed to fix the limits after I had replaced the coupler on my 18 yr old Craftsman. Thanks! Thanks! Bless all the youtubers like you who post this stuff.

Thanks for the clear video. Your video helped me find an idea to adjust my open/close limits to my gate. Here is the story: I had my Liftmaster 5580 ( from 2006) "fixed" by technician. The "fix" hold for 1 day... The Tech guy said that my gear was gone, and it will cost 350$ to replace it!, he also brought a new LM80 for 820$! I didn't agree of course. So, I looked for videos on KZfaq and thanks for all the good people that filmed their fixing I was able to understand what is going on. First, I opened the motor back door and I looked carefully. My gear was as new! Then I followed this excellent video by +All-Pro Quality Garage Doors Inc. to have a start point. (2 minutes work time :) Now, my simple idea is to bring the the up and down limiters to their correct place by visual inspecting and manual rotating the screws. I disengage the gate and put a mark on the rail holder of the trolley once for the gate is closed position and another mark for open position to the height I want. Then I engage the motor to a learn position (2 clicks on the orange square button on the back of the motor, the the small light is blinking) The advantage at this mode is that every push on the remote controller is either moving up or down, so I can adjust the trolley position. So, I brought the trolley to the up position and then my simple contribution to the solution is to rotate the up limiter with a flat screwdriver until its metal contact is touching the metal in the middle wide limiter gear, while I am with the motor back cover open so I can see exactly the movements and where and how much I should rotate (no more guessing...) The same I did for the down position. Then I engage the trolly to the gate, start another learning mode and there it was fixed! (at list 2-3 times up and down with learning mode so this motor can adjust itself to the force required. (The blinking light is stooped when the engine did it learning job successfully). I hope this will help someone with the same annoying problem.

Thank You! Thank You! Thank You! After replacing the sprocket on my garage door, it was completely out of adjustment. The darn thing nearly ripped the track off the wall mount. I came very close to throwing in the towel until I found your video.

Used this in 2023. Thank you for you help on this 21 year old garage door opener!

Thanks a lot for this video and the one on replacing the drive gear sprocket. Very detailed and informative to complete the job!

thank you! this is the info I needed to finish the job. I was just about to give up! I really appreciate the tip!

Thank you for posting. My limit clips on the adjusters came off after replacing gears and bushings. This video helped correct the problem.

You sir, just made my day!!! Just chalked that one off the honey-do list thanks to you! Thanks man. Where shall I send gift basket full of beer?!

Thank you for this video! I could not for the life of me figure out why the garage wasn't functioning after swapping out the gear & sprocket. Followed your steps and worked like a charm.

THESE GUYS ROCK!! If I lived anywhere near Santee, CA and I needed garage door repairs they'd be my FIRST call! Following their excellent videos I was able to swap my gear and sprocket assembly and then when I couldn't get the travel right I followed this video to the letter and after the recommended adjustments my 1994 era Liftmaster works like a champ. Thank you All-Pro!

My up travel limit had run out of travel and this showed me how to reset the up/down switch travel limits...thanks!

Great video! I've watched a bunch of videos and this is the only one that has tackled this topic. PS: I turned off the sound because the music is terrible.

This is the best video, I watched a lot of video they never showed you all this detail. I really appreciated. It helps me a lot. I already gave up. But last minute when I saw this video I fix my garage. Wonderfull video. Thank you

Thank you so much. I was knocking my head against the wall trying to figure out what I possibly did wrong when I replaced the sprocket assembly. When I came across your video, it was just what I needed; something so simple but I would not have known based on any written directions.

Thank you so much for creating this video! Had the issue with my garage door and couple of reputed companies just declared the Garage motor dead. However, I decided to open the cover and found that travel module clip was loose. This video helped me fix the issue and now its working again... on the same motor !!! Thanks Again !

Thanks Mike for making this video! I had to help someone with this exact issue last week after there gear swap. Now if they are having trouble with the instructions I have given them, I can link this video to them!

I just wanted to say thanks for making this video and your other one on the gear swap. I already had my drive gear out and was waiting on parts. Decided to do a little search and see what I could find when I came across the gear swap video. I hadn't even thought about the limit switches or locking my chain in place. Your video saved me some stress as I knew I had to figure out the end points before replacing the gear and chain. It was no big deal, but it could have been a mess. So you saved me a bunch of time and I now have a pretty good understanding how these units work. 7$ in parts vs 200$ for a new unit or much more for a garage door service to come out.

Nice follow up video to replacing the switch. Once you center everything up fine adjustments were easy. Thanks for the help.

GREAT VIDEO! I found myself needing to accomplish this after I replaced a broken belt. In following the video I also discovered what was probably the root cause of the belt breakage. In this case it was the retainer clip holding the odd shaped gear in place was missing. (not sure we it went) Since I saw that it was actually a low stress situation so I simply used a tiny zip tie. All in all, I'm a happy dude that saved money, and the door now shuts softly, and on the up limit side doesn't hit the stop. Did I say Great Video, and of course a huge THANKS!

I want to thank you for coaching me thru this repair. Following your instructions definitely helped. But I would like to suggest you add narrative to this video, it’s very hard to read and then follow your steps by reading at the same time. Thanks for the video.

Thanks buddy I was having a hell of a time trying to adjust it kept running out of adjustment. and I found your video I would have never thought of removing the gear to adjust it worked great thank you so much for your video

You are a life saver, after much frustration and time spent trying to fix the problem this worked! Thank you so much!!

Thanks so much. You were 100% right. I replaced the gear and I had the timing out of whack. This worked for me very well.

After I changed sprocket when I tried to close the garage door it came back up after it hit the ground. I was clueless and going to pay $$$ to fix until I saw this video and decided to give a last try. This video saved me $, time and effort. Thanks a lot!

Thanks so much for your quick response, After following your suggestions I learned that my problem was in my RPM sensor on my LiftMaster 1300. When I replaced my worn sprocket I inadvertently mis-aligned/dislodged the RPM sensor pinwheel located on the end of the motor shaft, thus disrupting the infrared signal to my circuit board. Again, thanks for your invaluable information and I hope my experience will help another fellow DIY'er in our quest to save a buck!

Thank you so much for this video. I needed to understand how this assembly worked because I screwed it all up. You saved me a lot of time, money and for that I can't thank you enough.

Thanks for the insight on the limit switch. Made adjustments with cover off U pointed me in the right direction Great video

Thank you very much for posting this video. Great video. Helped fix the issue I was having.

The ONLY video that helped me nail down the problem of my Sears Craftman door opener and solve it. I'm a layman and don't get too many opportunities to congratulate myself😀Thanks Mike for the video.

Thank you so much for this AWESOME video. I'm not very handy and need instruction like this. I switched out the sprocket gear but the door was haywire and the adjustment screws were not working. Just by looking at the still frame at about 1:30 in... I could tell that my yellow wired sensor had fallen off the white "up" screw. I got it back on and then followed your instructions to the letter with the hand adjustments. It wasn't anytime at all that I had the door functioning perfectly. THANKS AGAIN!!! You not only saved me money but also helped give me a great sense of accomplishment.

Absolutely an amazing quick fix to a frustrating problem. Many, many videos show how to change the drive gear and all of them fail to show your technique on how to adjust the limiters. They skip over that part of the repair and leave you wondering what it is you did wrong when the door won't stay down. Your video hits the nail on the head. BRAVO. Thank you very much!!!!

Great job, exactly the fix my LiftMaster needed, thanks a ton!

Thank You!!! My drive sprocket broke and I replaced it just fine. The problem was the up an down adjustment limits were out of range.Your video saved me a lot of time trying to figure it out.

Awesome subtitle ( after I screwed them up) was EXACTLY where I was. Thanks. My 27 year old opener working like new

Excellent video! My limit sensor was actually in pieces when I took the opener apart, but everything snapped back together and I was able to adjust it using your instructions.

Great vid thanks , would not of been able to do that tuning without your vid . thanks again

I commend you sir!!!! I don't know what I would have done without finding this video!!!!

Greeeeat video! After replacing the gear, i thought i was done when door wasnt working properly! Your video is exactly what i needed! Saved the day bro!

Thanks for the video. I adjusted mine and now it's working. You saved me hundred dollars, cheers!

Another grateful watcher. Great video. Many Thanks.

Thanks for this clear video, that helped me so much

Thank you so much for this video. Worked for me.

Thank you very much. Replaced the gears and everything was off.

What can I say ... this video was just the thing I was looking for... the down travel is perfectly fine. However the up travel still doesn’t come back up all the way . But whatever so far is miles better than what it was at ...

Thank you, thank you, thank you! This was exactly what I needed.

Many thank yous sir..,been fighting that sob for about 4 hours...

Searched but missed this until after I fixed a problem. I found my "Straight Door Arm" bent and the trolley at the wall end of the T rail. After disconnecting the door, the trolley would only travel about a foot then shut off. After looking at several other possibilities including the speed sensor that others suggested, I looked inside the housing and noticed the traveling limit switch contact was near one end of the drive screw. I adjusted the drive screw to put the moving limit switch in the middle just like this video shows. Then I adjusted the down and up limit switches about an inch from the drive screw and operated the trolley (without the door attached) to determine if I had the limits approximately correct. At this point, I could have adjusted the travel limit screws if I needed to, but I was close enough to correct that I decided to attach the door and run the opener again. A couple of adjustments of the down and up limit screws and both the open and closed positions were good. The cause of my initial problem was probably that the down limit did not make contact and the motor kept running, causing the nylon drive screws to flex and its gear disengage. I may need to replace the limit switch drive assembly if the drive screw loses its position again. I also need to reduce the down force because the straight arm was bent when the opener malfunctioned.

Thanks, Great informative video~!

I fucking love KZfaq. I had this issue after my chain fell off, I replaced the chain and trolley assembly, followed this video and BOOOOOOOOOOOM!! Thanks mate

Thank you, this really helped me out.

Thank you. Saved me $120 +

Great Video! The gears were all out of whack on my Liftmaster opener after the plastic sprocket coupler broke. It would be cool if you could link this video to that problem. Once again, nice job - thanks for posting!

just a great video, well done

Great video , no bullshit to drive people up the wall , well done .

Thanks buddy you saved my bacon.

this fixed my problem perfectly!

Good video, but it would be nice if you showed a little bit more about adjusting the pressure once you get the up and down limits set.

Great video on re-setting limits after changing out gear sprockets. I set the close (1/2 HP Craftsman) perfectly; however the open repeatedly hits the stop screw and when I watched the limit tabs with the cover off it made contact well ahead of where it stopped, meaning when the tabs made contact during opening, it never stopped. I checked and the wiring was intact from the limit tab to the circuit board. Any ideas? Do I need a new board?

Mike, the top of my chain gear sheared off and the chain got all twisted up. I replaced the gear assemble using your video. It was very helpful. I had to wrestle the chain back on and readjust it. Now when it runs there is a clicking sound from the gear at the top of the unit. I noticed the chain on the right side of the rail as you face the garage door is slight torqued. I think that is what is causing the clicking sound. How can I fix it? Thanks for your help.

So much bull out there , your video is perfect , thank you for sharing .

awesome video... saved me some cash on a new opener.

THANK YOU!!!

How do I get the trolley in the center of the rail? Do I pull down on the red cord and then hit the garage button on the wall? Also, once the adjustment are made, will this help with my issue of the garage door hitting the stop bolt and when closing the door comes back up? Any help is much appreciated. Your videos are very helpful.

So, I am installing a 1979 vintage GDO that has the chain and trolley completely disassembled from the t-rail and also the travel limits were randomly set all over the palace and most likely do not correspond to any position of the motor. However, BEFORE I attempt to "fine tune" the travel limits per your video, I need to "synch" the chain trolley position to correspond to the motor's fully closed position and for that I need to keep the limit switch from interfering (I think ...) with the chain/trolley travel. Do I need to have the DOWN limit contacts (brown wire) set to a position far enough away from the center contact (gray wire) so that the chain can engage the inner trolley BEFORE the limit switch DOWN contact shorts to the CENTER contact? Or does it NOT matter where the down contact is set? Or, should I DISCONNECT and REMOVE the travel limit switch all together during the initial motor-chain synch? If I do the latter, with the limit switch removed, will the motor keep trying to move the chain even farther after the trolley engages? TIA for any reply.

very good 👍

Thanks for the video! Where can I buy these gears? The gears in my 1/3 HP are worn out. I need to replace them. I couldn't find these parts from homedepot or amazon.

THANK YOU!! Great find due to being in a bind. Exactly what I've been trying to find. P.S. The thumbs down on this video are cluless. Thanks again! 👍😊

Hello and thank you for the great video. I got my 1991 Craftsman 1/3 HP opener to work after putting the new gear on it but it stops about 4 to 5 inches from the garage floor and immediatley goes back up without stopping. With the cover off I notice that the down limit does not make contact with the other metal piece, it stops about 1/4 inch before hitting the contact and then reverses its travel as the garage door goes up. In order to keep the garage door from going back up I had to adjust the limiter so it touches the contact right at the point of where the door goes back up in order to keep the door closed (so there is about a 5 inch gap between the floor and the bottom of the garage door). Any ideas on what is causing this to happen and what I can do to fix it?

New assembly installed no problem .

I replaced the gear and sprocket in a 1/3 HP Craftsman. After replacing, the door will only travel a foot or so and then return to where it started. In looking at the limiter screws and the center screw, the door doesn't travel to either of the limiters. Any thoughts would be appreciated.

I'm at my wits end. I repaired and replaced my sprocket, adjusted and reset the limits per your video, which is outstanding, and believe me I've checked out a few before finding yours. However, when I run the LiftMaster it only tracks approximately 12-15 inches down and then returns to the center position. I have not attached the door to the rail train because I am afraid of damaging my door. Any suggestions?

Hi - so I removed my chain and unsure what cycle the opener was in , will this work for installing the chain also?

Mike... my sprocket snapped when the door was closed and my trolley is close to the opening of the door. I replaced the gear/sprocket.....In adjusting my limits how do I move the trolley to the Center? When I go to open the door the trolley travels about a foot into the garage and then stops and travels back towards the opening of the garage. I am guessing that I need to remove my repaired sprocket/gears an then manually move the chain and trolley to the middle prior to adjusting the limits. Any help would be greatly appreciated. Thanks

Just to be clear, the arm should be disconnected from the trolley first or can it be left on?

I did a gear swap and did your adjustment but when the contacts come together nothing happens, the door keeps going until it hits the stops. I even unhooked the yellow wire and connected it to the grey wire and still it didn't stop. I clearly have another problem. Do you have any idea what it could be?

My new gear drive seems to be working properly but the motor will only move in the up direction until it hits the stop screw. Is this a limit problem or did something go wrong when I installed the new gear drive? Why wont it go in the opposite direction back down. Bad wiring?

So I followed your instructions. However my issue is my trolley will only move 1 foot forward 1 foot backward. So I moved it to the middle of the rail and it will only go like 1 foot and then returns one foot. I have the limits suggested just like you showed in the video. Any ideas? I did replace my gear and that's when I had this issue arrive. Thanks for any help!

At what point do you hook the garage door back into the trolley?

Thanks so much !! I did a gear swap and the limit switch was maxed out after I tried to adjust it. I took it apart again and thought I broke it. I snapped it back in , followed your video and it works like new !! Thanks again !!