I have a sears garage opener with a chain and sprocket drive. It is
approximately ten years old. Now it closes all the way but then
re-opens. I tried to adjust so it did not close so far but adjustment
doesn't work. When it opens it opens all the way until it hits the
stop nut. The others (3 total) do not do this. It seems it has lost
track of how far it is openening. Any ideas would be apreciated!
Sounds like the down limit is defective. The contact "ear" has broken off
the limit switch assembly. Take the cover off and you will see a wire
hanging loose at the limit switch assemby with the ear still attached. This
is why the unit doesn't stop at the down position and why the adjustment
doesn't do anything.
The part number is 41D3452 on openers made from 1986 to the present /
openers made before 1986 uses part number 41B2417.
You will find the part at
This part is very easy to replace.
===================================Garage Door Parts, LLC
On 15 May 2006 04:07:59 -0700, firstname.lastname@example.org wrote (with possible
Another possibility. If it's a chain drive, you may find that one of
the two limit rollers clamped to the chain is missing. One of my
openers has that happen regularly. It is very close to the rafters
and one of the limit rollers regularly bounces up, hits a rafter, and
falls off the chain. Until I get around to replacing it, I just wait
until it closes, then immediately hit the button. Note, you have to
use a manual button, the remote doesn't work.
Are you sure there's nothing (like a broom handle) getting stuck as the
door comes down? That was happening to me last week, and it was almost
impossible to see even standing right next to the darned thing.
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