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

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When I hit the button to open my garage, it starts to barely go up and then stops. If I push it again, it goes down, which is probably only moving 1/4-1/2". When I disengage on the rail to try manually raising the door, I cannot get the door to move. The chain seems to move on the track when I disengage the door, but the door won't go up at all.

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It sounds like your door is jammed. Look at the rail on each side of the door and make sure there isn't a latch that is preventing the door from moving.

Posted on Apr 28, 2010

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1 Answer

Circuit breaker tripped. Once reset, garages door opened all of the wa. The door only goes down two feet and stopped. When button is pushed again, comes back up hitting the stop quite hard?


Check the travel both up and down without the garage door connected. Check you owners/installation book that came with unit. When you assembled it did you have the trolley in proper place (up against a screw driver. If you don't set trolley and install chain you will have problems with the travel. Sit down and reread instructions and ensure that it assembled correctly.

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IT JUST STARTED TO ACT UP. i WILL START TO GO UP 1 FT AND STOP AND YOU PUSH THE BUTTON AGAIN AND IT GOES DOWN. tHEN YOU TRY AGAIN, SOMETIMES 2-3 TIMES.


Un-hook the chain from the door, and see how hard it is to raise the door. It should be easy, not hard. If it's hard to open by hand, the opener won't do it, and will stop. You can adjust the springs to counterbalance the door so it's easy for the motor to lift it. You may need new springs.

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Door goes down and when it stops at botton, it turns and goes back up ??? Need adjusting ..How can I adjust???


Adjust the position of the door by using the black and purple buttons. Black moves the door UP (open) and purple moves the door DOWN (close)
Setting the up position: 1. Press and hold the black button until the LED starts flashing slowly, then release. 2. Push and hold the black button until the door reaches the desired UP (open) position 3. Push the door control or programmed remote control. This sets the Up (open) position and begins closing the door. 4. Immediately when the door begins to close press and release the black or purple button. This will stop the door Setting the Down position: 5. Push and hold the purple button until the door reaches the desired DOWN (Closed) position. 6. Once the door is closed, If there appears to be too much pressure on the door, you may toggle the door back and forth using the black and purple buttons to reach the desired closed position. 7. Push the door control or programmed remote control. This sets the Down (closed) limit and the door should open.

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HI, AFTER REPLACEING PLASTIC GEARS IN SAERS GARAGE DOOR O[ENER, OPENER WILL NOT GO THROUGH COMPLETE CYCLE. WHEN BUTTON PUSHED TO OPEN, OPENER GOES INTO CLOSE CYCLE AND HITS STOP BOLT. ATTEMPTED TO ADJUST...


Loosen the chain enough so that you can remove it from the sprocket above the motor unit. With the door closed run the motor until the sprocket turns clockwise and stops. With everything attached replace and tighten the chain. Some adjusting of the up and down limits will probably be required.


Mar 28, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have an access master door opener..it goes up about 6 inches and stops, hit switch again, goes down, hit switch again goes up about two feet, hit switch again goes down, third time switch nothing until...


Door sensors have nothing to do with door opening. Only closing. It sounds like you have a bad gear in the motor unit. Remove the cover and it will be obvious if the gear is bad.

Feb 15, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Door stopped opening!?!?!?!


Remove the cover of 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 bad.

Dec 26, 2009 | Sears Craftsman LiftMaster Chamberlain...

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Lift master garage door opener. Motor makes noise when switch is hit likes its running but chain/sprocket doesn't move and the door is stuck open. Chain is on sprocket. Not sure if the motor is frozen? ...


I had the same problem. Took the cover off of the opener and found that the gears were stripped on the unit. Motor was fine. You can order gear replacement kit for the unit. They are a plastic type sprocket and worm gears. The kit comes with spindles and all necessary clips. You have to take the unit off the ceiling to replace the gears, but the process if very easy to do. Parts kit about $40 on line, much cheaper than a new door opener. Total process took less than 2 hours, including getting the unit down and back up again.

Jan 24, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Remotes don't work (3)


Did you inadvertantly hit the "vacation lock" button on the Mounted push button? This will cause the remotes not to work. Try hitting the button again, and then see if the blinking goes to solid green.

Good Luck

Jan 01, 2008 | Sears Craftsman LiftMaster Chamberlain...

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