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

2 Answers

Sears opener wont open or close more than 12 inches

I replaced gears in my opener, now it only goes about 6 to 12 inches then comes back .how do i fix

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  • br56uce Feb 06, 2009

    I have the same problem. I took the chain off and ran it and it still does the same thing. I checked the stops and it does not go as far as ether stop before it reverses and stops. There are no flashing lights after it stops.

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There are some screws with arrows pointing up/down on the back of the unit, I tweaked the screws and it started to work fine in my case

Posted on Feb 06, 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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