My old garage door opener seems to have bit the dust today. It's a
Sears 1/3 HP model 139.663900, serial number E-154271, circa mid- to
late '80s. When I tried to open the door this morning, it lurched a
bit, opened the door half-way, then stopped. The motor inside sounds
like it's still going, but the sprocket on top doesn't seem to be
I guess I'll take it down and open it up to see if there's something I
can fix inside, but I'm not optimistic. I looked around the 'net a bit
and it seems that parts for this are no longer available (not
surprising.) I'm not upset - this thing has lasted about 25 years with
daily use and never been maintained, so I guess we got our money's
worth out of it.
What I'd like to know is, can I buy a replacement opener that will work
with the existing chain? It would be a lot easier to replace just that
unit than to have to replace the chain, springs, etc.
So, any advice about this? Here's some pictures of the old unit, and a
parts diagram I found on the Sears web site.