Craftsman Garage Door Opener - Won't Open or Close Completely

Hello:

I replaced the whole sprocket system in my Craftsman 1/2hp chain garage door opener now. Prior to doing so, I had played with the travel and force knobs in trying to figure out why the chain wasn't moving. And now that the sprocket system has been replaced, the opener works, sort of. But now it won't open the door more than 6-12. It moves on way that amount, and then reverses that amount, then stops.

I've toyed more with the travel and force knobs, but to no avail.

HELP!

Much thanks,

Michael

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svfixer avatar
7 years ago #2
svfixer
Wiz
Blogs: 57
Forum: 7,904
Votes: 88

Michael, I can't tell whether you have read the attached article or not, but if you read it, and all subsequent postings that accompany it, you should be able to tell where you went wrong.

http://www.diyforums.net/changing-gear/shaft-assembly-on-chain-drive-opener-184.html

 avatar
7 years ago #3
Michael
Guest

Thanks much for the link. I read through and verified everything I needed to do. I have the close position set perfectly. The door no longer reverses once it hits the down position. However, when I hit the button to open the door, the door still only opens about a foot. The open travel setting is set at about half way from the contactor, so nothing should be stopping it from moving up, right? Plus, the force setting is about 3/4-4/5 of the way up already, so it's not for lack of power.

Any other ideas?

PS. Couldn't quite follow Kate's description of needing to tighten a coupler. But I'm pretty sure I made sure everything was installed tightly.

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6 years ago #4
WV
Guest

I have the same problem as Michael. The door only moves a foot in one direction and then a foot in the other direction. This is whether the door is engaged or not. I've changed the force both up and down. And, I can see the switch is not hitting the contactors. Any ideas?

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6 years ago #5
WV
Guest

I was able to figure out the problem with help from another forum. I had missed reconnecting the small 4-pin board directly next to the black cap that is the last piece you put on the motor shaft. Before connecting that the trolley would move 1 foot in one direction and reverse, going another foot in the opposite direction. As soon as I reconnected that board all was fine.

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6 years ago #6
Bob
Guest

I have the same problem. the motor will only run for a second in the down direction and then reverse to the up direction for a second. This is not an issue with the up/down contacts since the contacts on the center screw is midway.

I made sure the 4-pin board is connected. Is it possible I have it connected upside down? would it fit the wrong way and cause this problem? It does the same thing whether connected or not. I don't want to try reversing it and fry the wiring. I assume the contacts go in the full holes and not the exposed half-holes on the outside.

Could this be caused by the bushing not being installed properly on the drive shaft?

Any ideas anyone?

svfixer avatar
6 years ago #7
svfixer
Wiz
Blogs: 57
Forum: 7,904
Votes: 88

Closest thing this sounds like is the safety sensors being out of alignment.

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6 years ago #8
Bob
Guest

According to the lights, the sensors are working properly, so that does not seem to be the problem. I tried jumping the contacts (connecting contacts two and three), but that did not work either.

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