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

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CRAFTSMAN 1/2 HP OPENER

I RECENTLY INSTALLED A DRIVE GEAR KIT IN MY CRAFTSMAN 1/2 HP OPENER.AFTER INSTALLING THE KIT THE DOOR ONLY OPENED APPROX 2FT.THEN CLOSED IMMEDIATLEY.THE MOTOR RUNS THE SAME CYCLE EVEN WHEN THE CHAIN IS DISCONNECTED.I ADJUSTED THE UP FORCE KNOB,NO CHANGE,I ADJUSTED THE UP TRAVEL KNOB TO THE FULLEST STILL NO CHANGE,IS IT POSIBLY THE LIMIT SWITCH.?

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  • lostsoul544 Feb 10, 2009

    yes the door was unplugged.after reassembly of the unit after installing gear kit the door was down and the inner track guide was in the down position when the chain was hooked up

  • temkim13 Feb 11, 2009

    The original problem description is almost identical to my situation except my door tries to go down first, then up and stops with the door 1' off the ground.



    I have adjusted the up and down limit controls, as well as the up and down weight control. The center contact (the traveller) doesn't even come close to touching the other contacts before stopping.



    I have tried to run the motor with the chain off, the chain on with the door disconnected and several other combinations of conditions. No matter what variable changed the operation was the same.



    Any ideas?

  • Doorguy27
    Doorguy27 May 11, 2010

    What postion was the chain in when you installed it? Down? did you unplug the opener when you changed it?

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  • 30 Answers

Ok well the best advise I can give you is to open up your opener case should be a 1/4 nut driver or a Philips head screw driver. Make sure to unplug it first. Once the case is off, find a reqtangle black box with three white plastic screws they are what controls the limits. Chances are they got knocked off wheny ou were putting in the gear. check to make sure the wires are hooked up and find the placement of the limits make sure they can touch each other. Little tip I do for my customs is get a piece of sand paper and rub it agaist the metal contacts for the limits only. (after time lift master openers bind up a film and dont stop where they supposed to.) If your still not sure how the limits work plus in the opener and run it make sure not to put your hands inside the opener and nothing esle is in the way. Then adjest the limits as needed. That should take care of you if not go ahead and make another post ill check back with you.

Posted on Feb 10, 2009

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