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

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I own a Craftsman garage door opener that was installed in 1996. Recently, on a sporadic basis, the door will "shudder" or perhaps travel a foot or two then return to original position when I attempt to close it. Any suggestions? Thank you. Mike

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It sounds like the limit switch for the up sensor is bad.It 'thinks' it is already down,so it will not go down.There have been a couple where the person removed the cover and found a cracked gear also.It was allowing the gear past it's limit switch.Pull the circuit breaker for the system before you open the cover.It is a pretty simple system so it should not be a problem for a DIY'er.Once you open it,there is most likely a metal tab or something sticking out,on or across the gear,connected to an electronic component.There should be 2,1 for up,1 for down.If nothing is obvious,you can try turning the CB back on.Activate it to go down again.You can kind of play with the sensors but make sure to stay clear of any gears or wires.You probably will be able tohear the limit switch clicking when you move it around.Best to have someone else around too.Make sure you do not have any sleeve hanging out.It is hard to describe what you are looking for.Just be careful is what I always stress.If you have any questions/comments,comment here and I will get an autolink to your post and will reply ASAP.I check here pretty regularly. Good luck,Greg

Posted on Nov 10, 2010

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