Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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CRAFTSMAN I have a Craftsman 1/2 HP opener (no safety photo cells). I just replaced the worn out gear, and put everything back together again precisely. Now when I try to operate the unit, it runs find but one for one second. then it stops, and goes into reverse for one second. It does this with the chain attached, or without the chain attached. No adjusting of any kind changes it. It just runs one second one way, stops, and runs one second the other way. I have busted my brain trying to figure out the problem and have double/tripple checked everything. Someone please help.

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The Craftsman HP openers will go automatically to reverse if it does match too much resistance.
If the opener goes to reverse it is because it had been not properly assembled ad geard are not running, the opener stops and start reverse for a couple of seconds.
The opener should be taken apart and re-assembled.

Posted on Feb 18, 2009

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Check out whether you have fitted the gears properly.it will be upside down.just make it proper and check out again.

Posted on Feb 05, 2009

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Sounds like the safety switch needs adjustment... it thinks it's hitting something so it stops

Robert

Posted on Feb 05, 2009

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You may have put the chain back on out of "sync" with in internal up and down stops. You may have to take the chain off the motor sprocket and run the motor to make sure it is stopped in the down position ( watch the rotation of the sprocket to determine up or down position) When the motor is stopped in the down position put the chain back on with the chain Carriage in the down position. Then you can fine tune the up and down stop positions with the adjustment screws on the side.

Posted on Feb 05, 2009

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