Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
We have craftsman Garage door opener. Sometimes when we close the door, it moves 1 feet and then go back up. It doesn't happen all the time. Any help would be greatly appreciated...
The Craftsman GDO has a RPM sensor that, if not working correctly, will cause this problem. Either the optical sensor itself is dirty, or more likely, the wheel that is attached to the motor shaft has slipped. This is also a common problem if you have changed the worm drive. The motor shaft has about 3/16" of play (in and out) and if you do properly re-assemble the collar and leaf washer this play will prevent the RPM wheel from working properly.
Posted on Dec 24, 2007
Most likely the sensors on the base of the door are misaligned
Posted on Nov 13, 2007
I have this same problem periodically. I fix it by manually closing the door and then letting the truck re-engage the door and everything is fine......unitl next time.
Posted on Oct 05, 2007
I had the same problem and fixed it by greasing the chain and roller chamber and spraying silicone on the springs. Works beatifully now AND my wife is happy.
Posted on Jan 06, 2008
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Posted on Jan 02, 2017
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