02:32PM | 12/10/03
Member Since: 12/09/03
2 lifetime posts
Last night the chain on our craftsman 1/2 hp garage door opener came off the sprocket. We reattached the chain. Now the chain comes off the sprocket after 1 cycle. We used our owners manual as a guide and tightened the tension on the chain.

any idea what could be causing this?


04:52AM | 01/06/04
Member Since: 03/13/00
1675 lifetime posts
The way to find the problem will likely be through observation.
With the opener disconnected, try opening the door manually. It should open reasonably smoothly. If there is a bind, that could be causing the problem.
Also, watch the chain when the door is being opened/closed with the opener. Is it dragging, hitting something, or jumping around? Next, inspect the sprocket. Is it missing teeth or bent?


10:30AM | 01/06/04
Member Since: 12/09/03
2 lifetime posts
Thanks for the reply. We called a professional and had him look at it. He found that the problem was the opener bracker had been attached too low on the door causing binding.

thanks again.

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