I am having a problem I hope someone can help me with. I just replaced
the plastic gears in my Craftsman 1/2 HP garage door opener, and now
motor wants to turn one way for about 2 seconds, stop, turn the other
way for about 2 more seconds, then stop completely. This even occurs
when the garage door is NOT attached to the garage opener.
Is there a reset button that I can't find on this unit? I've taken the
load off the motor, checked all stop contacts (which are all open -
not the problem).
What might be wrong? I've called Sears, but to no avail. Responses can
be either to newsgroup or email. Thanks in advance.
yrs. old... but from experience with working on it the past 25 yrs. i
would say that anytime a motor goes one way and then back the other way
by itself is that its being jambed and setting off the motor inside to
opener to twist and then the contacts on the reverse mode go into
action... this is to stop the g/door opener to not hurt anyone or damage
something... take a look inside (have the sheet metal case off when it
does it to see whats jambing up and making it go the other way...if you
had to replace the gears(they probably broke due to something jambing up
and letting them break... i got a screw drive on mine... i would take
the screw off and run it to see whats the problem... you might have a
chain drive.. if so then take the chain off and see if it works
correctly=by not reversing???? if so then you work from there back to
the other sprocket.. and so on....
The speed sensor cap/cup that mounts on the motor shaft is not seated
all the way down, It is shaped so that the serated cup pases through a
sensor receiver on the board to detect when the unit slows down or
stops. It thinks you are stuck because it isn't getting a count.
Garage door Opener Problem Repair FAQ
I did the same thing.
2 things need to be reset.
First is normal travel range. You altered the 'timing' when you reassembled
the gears. You should have 2 travel controls. Adjust them until you begin to
get more travel in the direction you need. Keep adjusting until you get all
the way. IF you don't get all the way, you will need to reset the actuator
timing, write back.
The second adj. is the load stops. You should now have less load because the
freshly greased new gears work better, right? After the travel is right,
adjust loads stops until they both just barely allow the door to go all up
or all down.
firstname.lastname@example.org (Krebs) wrote in message
Did you put the revolution counter cup (small round black plastic w/
notches in the side) back on the end of the motor shaft & is the
revolution conter board seated properly. The cup should be going
through the middle of the board & the board produces a timing pulse
thru the notches in the cup. This is the part that makes the door
reverse when it hits something. When the timing of the pulse change
from the motor slowing down it reverses. Therefore if the cup is not
in place properly the opener thinks the door is hitting or catching on
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