I have a Liftmaster 1991 1/3 hp opener, it reverses when it hits
bottom, I tightened the chain and have tried playing with down force
and reducing the travel adjustments but have had no luck even backing
off travel maybe 3 turns, any ideas? Could it be broken to the point
it cant be adjusted and needs replacing, liftmaster doesnt support
earlier than 93 model year.
I'd open it up and look at the travel adjustment. If it's like mine
it has plastic screws that moves where little switches are tripped.
Switch probably isn't closing. I can adjust mine to stop inches
before the bottom, which I do sometimes to leave a cat opening. These
old ones do not have the safety beams so they use excess force to
reverse. If it thinks it has not reached the bottom because the
bottom limit switch is bad it will reverse when it can't go down any
I'd try superglue or pvc pipe glue. But I agree with your concern,
plastic is hard to successfully glue. Can you replace it with a metal
bracket? Or like Bob suggests, drill a small hole through it and use
a tiny bolt or screw.
I've had some success finding obsolete parts on ebay. You could also
watch craigs list for a used one cheap as a parts source.
If I could wrap it with shrink wrap tape after using your idea of PVC
glue it might work,
I have it working now fine and held on with alligator clamps, yes a
scew is an idea but not much plastic there or room to work on it,
thats the hard part, the area of work
Whatever works - Now that you know the problem, if it happens again
when the epoxy and alligator clips fail you will know what to do.
Only concern is if the clips and epoxy fail, will they damage anything
else in the mechanism.
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