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

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Liftmaster garage door opener problem.

Hello, I have just installed the rebuild kit for my liftmaster opener, (yr 2000). I have adjusted the springs so the door will hang still four feet off the ground. I degreased and relubed all parts-chain, wheels, pivot points, etc. Now the problem is when I activate the opener the door only travels about one foot, then stops and reverses.????
Thanks in advance,
Vince

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  • wildbregner Dec 30, 2008

    I replaced the plastic drive gear ,now door will only travel about a foot then comes right back up.

  • sclark1959 Jan 03, 2009

    I also just replaced the gear and sprocket kit and have the same problem. The traveler moved about 8 inches, stops and goes back. No apparent reason.

  • Joseph Chapman
    Joseph Chapman May 11, 2010

    When it reverses does the traveler go all the way open or closed or does it just travel a foot or so and stop.


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Thats what it was

Posted on Dec 31, 2008

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Make sure that you pluged in the RPM Sensor.

Posted on Dec 30, 2008

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With my door closed, i push door button to open and the chain and opener continues inthe closing mode. any help?


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How much is gear kit for 1/2 #41A2817?


Gear kits can be purchased for chain drive machines from any of these 3 brand names ...Liftmaster/sears craftsman /chamberlain / All 3 of these brand names are manufactured by Liftmaster the worlds largest maker of garage door openers and related parts ! You can purchase a gear kit on ebay for around $30 or less depending on the seller ! If you go to garage door parts sites it will be slightly higher so your best bet is EBAY , The gear kit only requires the main gear and sprocket housing that attaches with 3 screws , just remember after the gear is installed that you run the motor co that the trolley starts in the door down position otherwise you risk having the trolley smack into the opener , this is crucial for any travel adjustments that are made later! Hope this helps you ,sincerely Glenn

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Does it make a noise? Did it run before you changed the springs? Did you replace springs on opener or on the door? What adjustment screws are you looking for? Do you think they went out of adjustment when you changed the springs?

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The range for the remote openers (4) for mu Liftmaster garage door opener has decreased to the point of having to be within 6 feet of the door to open it. The liftmaster was installed 5 yrs ago. The...


There is an antenna extender kit available for your opener. The part number is 41A3504 and should be available from any good door opener company that handles Liftmaster or Chamberlain. It should come with instructions.

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My liftmaster garage opener started today with only closing part way and opening part way. What can be causing this? Thanks


FIRST - pull the cover off and see if you have shredded white plastic inside.

IF YES - replace the drive gear set.

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The owners manual has a good diagnostic section - available at liftmaster.com

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I have a LiftMaster garage door opener.When the door closes it is not completely closed on the right side. It has about a 1/4" gap at the bottom. It starts closing evenly but when it is about 2 feet...


It sounds like a door spring problem. Here is a website with a video of adjusting a door with extension springs.

http://www.diygaragerepair.com/Extension-Springs-s/296.htm

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1 Answer

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COULD BE A BROKEN SPRING
COULD BE A SENSITIVITY ADJUSTMENT.

HOW DOES THE DOOR WORK MANUALLY - IF YOU CAN'T LIFT IT NEITHER CAN THE OPENER.

ALSO COULD BE BAD DRIVE GEARS - BUT MOST OFTEN A SPRING 2ND WOULD BE OPERATOR ADJUSTMENT

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1 Answer

Belt drive track arm bows up


YOU MAY NEED TO GET THE SPRING ON THE DOOR ADJUSTED.

WHEN AN OPENER IS INSTALLED THE SPRING SHOULD BE SET A LITTLE HEAVY. YOU WANT THE DOOR TO SLOWLY DRIFT CLOSED IF LEFT HALFWAY UP.

IT SOUNDS LIKE EITHER YOUR SPRING NEEDS ADJUSTMENT OR THE DOOR BINDS AT THE BOTTOM - HOW DOES IT WORK MANUALLY??

IF YOU CAN'T CLOSE IT WITH 3 FINGERS THE OPENER WILL HAVE TROUBLE.

YES THE CRAFTSMAN RAIL IS WEAK MAKING IT THAT MUCH MORE CRITICAL TO SET THE HEIGHT PER INSTRUCTIONS AND MAKE SURE THE DOOR WORKS EASILY,

HOPE THIS HELPS

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The door obstacle detector(reversing switch) needs adjustment, or the down limit sensor needs adjusting, or one of the lift springs is loose or broken. First, remove power from the opener, pull the red door release rope, and try to lift the door up manually. You should be able to lift it all the way open with litle effort. If it opens ok, pull the door down about halfway and let go. If it is properly balanced, it should stay where you left it. If the door fails either one of these tests, it needs spring replacement or adjustment. If the door moves ok, refer to your owners manual on how to adjust the reversing switch, linit switches, and photocell sensors at the door bottom.

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