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Does it have an "electric eye?" If yes, there's probably a problem there
with blockage or alignment.
The opener is designed to shut down and reverse if it feels the motor
is working too hard to move the door. One reason it might work too
hard is if the door hits something or someone. The adjustment you
talk about simply sets how sensitive this feature is. All the way in
one direction will make it act exactly like you are seeing. All the
way the other way should make it plow through almost anything. Try
that as a diagnostic, but don't leave it like that as it should stop
and reverse if it hits something. Possible reasons it might have
changed are need of lubrication or a binding door. The safety feature
has no way of knowing *why* the motor is working harder than usual.
Do you have the "electric eye" safety system? If so........press &
hold the wall switch. If the door closes completely, the electric
eye system has a problem. Dirty lens, bad connection, poor alignment,
etc
cheers
Bob
Not sure on the 88 - but I think you have current sense on the drive
head, and limit switches on the track. If so, you want the downforce
adjustment st to MAX.
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Flip the lever that disconnects the door from the opener and try the
door by hand to see if it feels right.
First disconnect the door from the opener by pulling the emergency
rope, then move the door manually through its entire range. It should
be balanced well enough that you can move it all the way up and down
with only a few fingers.
If it doesn't move easily, it needs to be rebalanced. If your door is
balanced, it's unusual. Most doors are _way_ off. They start off
balanced, but nobody has the door guy come out every year for a
tune-up. The opener works harder and harder as time goes on, until the
load is just too big to handle. That's when your problem appears.
You can find web sites that will walk you through the tuning process.
Most of it is pretty straightforward, like getting the tracks straight
and oiling the rollers, but the springs can be a bear. They can take
off your head if they let go at just the right time. I've had them make
holes in walls--nasty ones. (I don't mess with springs any more.)
As for oiling, get a spray can of lubricant that's designed for garage
doors. You put it only on the rollers and other moving parts, not the
track.
--
Steve Bell
New Life Home Improvement
Arlington, TX USA