On 2/4/2016 8:04 AM, Don Y wrote:
Neighbor complaining of a rattling noise. Didn't take more
than a moment to determine chain is slack on his GDO.
Simple fix -- end of story.

But, got me wondering as to the potential downside of a
"slack" chain -- beyond the noise and *eventual* wear
on it and the drive bar from that rubbing.

OTOH, a *taut* chain is a recipe for premature wear in
the mechanism...
If it's like my door opener, which has a slack chain about every three
months, there is an adjustment screw on the back of the motor/gear box.
Climb up there and tighten the chain.

I have not yet found a way to keep the adjustment from moving and
slacking the chain.

Paul