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

2 Answers

Garage door opener

Hi,
i just replaced the helical and drive gears in my opener. Now the door opens and immediately closes only 1 foot. I can't get it to open all the way. Any suggestions? I've already checked to make sure the sensors are aligned and have adjusted the up and down limits.

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On end of worm gear is rpm sensor. either too much play left in shaft or soft pins on connector are bent not makink contact

Posted on May 26, 2009

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See your post under Garages in the Garden Web.

Posted on May 17, 2009

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I have a Craftsman 1/2 HP garage door opener, the left sensor is orange and the right sensor is green. the problem is that when i try to open the door, it only opens about a half foot and stays there. i...


Nothing wrong with the sensors and they only work when the door is closing anyway. Sounds like you may have a broken door spring or a bad drive gear. The drive gear is white nylon and is in front of the motor. It will be obvious if it is going bad.

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Model # of my garage door 2280-267C serial #26142100151


Check your door springs to make sure one hasn't broken. Then remove the cover off the motor unit and check the drive gear. It is a white nylon gear just in front of the motor. It will be obvious if it is going bad.

Jan 07, 2010 | Sears Craftsman LiftMaster Chamberlain...

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Garage door opens about one foot and remains there.


Check the door springs. You could have a broken spring. Also remove the cover and check the drive gear. It is a white nylon gear just in front of the motor. It is possibly stripped. This is a good time to release the door from the opener and operate it by hand to see just how heavy it has become.

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you need to replace gear when the door is fully closed. then do your tweaking.

Jun 01, 2009 | Sears Craftsman LiftMaster Chamberlain...

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Yes I agree. Sounds like the Helical gear. Plastic. Pretty easy and cheap fix. Find one on ebay for 8 bucks.

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From your description it sounds like you forgot to plug in the RPM sensor.

Mar 16, 2009 | Sears Craftsman LiftMaster Chamberlain...

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there are little knobs on the back for adjusting up and down turn them up and you should take care of your problem.

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Door only opens 1 foot........


Most likely you have a broken door spring. Look closely as sometimes it is hard to tell. Also remove the cover and look at the drive gear. It is white nylon and is just in front of the motor.

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