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Garage door maintenance.... joy

It has to be a little slack. Don't tighten it too much. I believe for mine, the chain had to be able to sway 1" up / down. Perhaps this is a guideline for common garage door openers.
 
guess googled failed me. i searched for craftsman AND garage door... and it came up with #%@ sears and sites selling garage doors.. no craftsman.com hah🙂
 
I just installed a Craftsman Garage door opener at our house, chain drive. The manual said to have enough slack so that the bottom part of the chain was not below the bottom part of the steel support channel. I initially set it up correctly and over a period of a month or so I had to re-tighten everything because too much sag developed. I just adjusted the tension at the door end where the chain attaches to the bracket linking to the door.

So overall I would say you want there to be enough tension to keep it just about even with the bottom of the center steel beam. This is of course at the lowest point of the chain.
 
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