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

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When you open door, it goes up fine, but when it gets to the top, it doesn't stop at the normal spot, then it disengages and the door releases and comes crashing down. Then you have to reengage it, in order for it do work again. So, now I have to hit the button again to make it stop just before it disengages at the top. What is the adjustment or is there a "stopper" at the top that has come loose and moved, that makes the door stop at the appropriate place?

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You have a couple of problems. First if the door comes crashing down, it is not properly balanced. The door should stay in the up position by itsself. Next, the limit settings are off. there are two white screws on the side of the opener. Adjust the screw labeled up. Turn it one full revolution "less" and try the opener without the door enguaged. Continue to adjust if necessary. If this does not work, take off the cover and look at the white nylon gear and see if it stripped. There will be white shavings in the bottom of the cover. If it is replace with a "liftmaster gear and sprocket assembly". Issue two is door balance. Raise the door manually. At each hinge point (the roller is in the radius part of the track) the door should hold itsself up. If it does not, your springs need to be adjusted or replaced. Most springs are designed for 10,000 cycles so if they are over 8-10 years old, they are ready to be replaced if you use your door regularly. I dont reccomend adjusting the springs yourself. It is exteremly dangerous if you do not know what you are doing. I hope this helps.

Posted on Feb 26, 2009

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