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

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GARAGE DOOR OPENER

I HAVE A SEAR CHAIN DRIVEN GARAGE DOOR OPENER THAT RAISES THE DOOR TO HIGH. HOW DO I ADJUST THE OPENER

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  • ernieb10 Aug 05, 2008

    I have an old Sears Craftsman garage door opener - no longer have the manual. The door opens several inches too far and I need to adjust the travel.
    The only adjustment screws I can find are the open force and close force screws. I've tried to adjust the open force screw by several turns both ways but it does not seem to make any difference. Any suggestions?


  • woody22 Jan 20, 2009

    Sears Craftsman 139 655000

    This opener was left at my rental house not installed, I installed it and now it just wants to open and close and I can't find an adustment sensor to stop upon closing or opening. I have no manual. Please help.

  • Anonymous Mar 31, 2014

    trying to install a genie garage door opener a belt driven one and it will only go up and not down

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Depends on how old, OLD units need to take cover off and adjust cam stops. Not easy if you have not done before,

Posted on Jan 15, 2009

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Refer to your owners manual to adjust the travel limits to stop the door opening too high

Posted on May 04, 2008

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I'm no expert, but on a previous door opener I had (don't know the brand), the side adjusting screw basically adjusted a limit switch, which was located inside the plastic housing (where the motor is). I was able to remove the housing, figure out which limit switch was actually being contacted "too soon" on the way down and adjusted it while watching it.

Just a suggestion, you might take a look.

just keep your hands out of the way of the chain and sprocket if you do take the housing off. .

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Loosen the inner nut on the trolley. (That is the lock nut). Then tighten the outer nut on the trolley to increase tension. The outer nut on the trolley is closest to the garage door. The chain tension should be 1/2 inch off the rail at midspan. (The chain is fastened to a threaded bolt on to the trolley. The threaded bolt has an inner and outer nut). Hope this helps.

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