garage door opener safety reversal

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  • Updated 2 months ago
Upgraded from a Craftsman 1/2 HP chain to a Chamberlain 1.25 HP belt drive. I used the old door bracket, header bracket, and ceiling bracket as is. I set the door closed position to fully closed right before the point where the rail starts to bow. When I do the safety reversal test, 2x4 flat under the garage door, it does not reverse. I have 2 questions:
1) The rail is parallel to the ceiling and I now know that it should have a bit of downward slope from the header to the motor, but how much? Is that really important and is that contributing to the failure of the safety reversal test?
2) The Chamberlain instructions for attaching the curved arm to the straight arm are fuzzy. "Bring arm sections together. Find two pairs of holes that line up and join sections." Problem is I can find more than two pairs of holes that line up so I opted for holes at the distant/bottom end of the straight arm. Is that important and is that contributing to the failure of the safety reversal test?

Unfortunately this forum won't allow me to attach any pics, it says "internal server error".
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Bradley Holcomb

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Posted 2 months ago

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