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

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Motor comes on and only moves door about 1/2 inch, it keeps running without any further movement in door until it is turned off.

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You need to remove the cover from the motor unit and check the drive gear. It is a white nylon gear just in front of the motor and most likely you will find it is stripped. It will be obvious.

Posted on May 24, 2011

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The gauge is supposed to move. Between 190 and 210 degrees. About a 1/16 to 1/4 inch movement with the needle. If it goes from middle(200 degrees) to hot(260 degrees) and back. Check the coolant level. Air pocket in the engine. Low fans come on at about 210 degrees. High fans come on at 225 degrees. High fans come on when the A/C is turned on. And it works.

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Power windows go down part way and start clicking without moving


I had the same thing with my driver side window. I took the door panel off and did not see any physical damge. But if I ran my hand along the regulator track, I would feel the cable had started to fray and come apart. The clicking was the cable within the spool that winds up as you use the window rubbing against the plastic. My van is a 2000 and I was able to find a .pdf of the Dealer repair manual online, only one page talks about the regulators and shows for a manual setup. But it made the mounting screw locations easier to find. Go to you-tube and type in your car make and year with something like, "how to replace a window regulator". I was lucky enough to find one for my van. In my case, the space you are working with is extremely tight, but I was able to get it all back together and it works great. I just fixed it yesterday, BTW, just wanted to pass on the good fortune.

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Jul 31, 2012 | 1996 Buick Skylark

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My drivers side power window went down and now wont go all the way up. It will only go up about 3 inches then stops


Three inches at a time, or three inches total? If three inches at a time, you need a power window motor. If three inches total, you need a window regulator. Both these items are typically replaced as an assembly anyway.

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I have a Craftsman 1/2 HP Garage Door Opener, Model 139.18076 or thereabouts. One day the door went up and it didn't come back down without me detaching and closing it manually. The motor hums/clicks...


Check to see if the trolley is jammed against the bolt just in front of the motor housing. If it is, loosen the chain enough to take the stress off and then run the opener until the door closes. While the door is closed locate the 'down limit' on the side of the motor unit and turn this control 2 full turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

Mar 30, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman 1/2 hp garage door opener motor just buzzes when the remote is pushed no movement


Check to see if the trolley is jammed against the bolt just in front of the motor unit. If so loosen the chain enough to remove the tension of the trolley. Now run the motor until the door closes. While the door is closed, locate the 'up limit' control on the side of the motor unit. Turn this control 2 full turns in the opposite direction of the arrow printed on the cover. Tighten the chain.


Jan 21, 2011 | Sears Craftsman LiftMaster Chamberlain...

3 Answers

Motor hums but door doesn't move. If I disconnect door and give chain a horizontal poke, it will move. When I reconnect door it returns to humming, without movement.


Remove the cover from the motor unit and you will find the drive gear has stripped. White sawdust all over. The part number for the gear kit is 41A2817 and it comes with instructions. It is available at any good door opener service company.

Feb 04, 2010 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Stuck garage door - Sears Craftsman 1/2 HP GDO, Model 139.18876


You have to sync the limit switch with the trolly. Take the small white piece off the bottom of the gear and sprocket assembly. Rotate the center screw on the limit switch until it is all the way up. Put the chain back on the sprocket with the trolley in the up position. Put the small white piece on the bottom of the gear and sprocket assembly. Operate the opener with the trolley dissconnected from the door. You will have to adjust the limit screws on the side of the opener accordingly.

Feb 13, 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

Gate will not completely close.


Most likely your chain is not going to be your problem. When you pull the cover off of your SL 3000 there will be a little rectangle box on top. There is either one or 2 screws holding the lid down...loosen the screws and take the lid off. Inside there will be a long screw drive with 2 plastic nuts with teeth.At either end of the screw drive you will find a switch that one of the nuts should be resting on. (these are your limit switches that tell the motor when to stop) Run the gate open and closed...when you run it closed see if it is hitting one of the limit switches when it stops. (turn off the power) If so, hold back the plate keeping the nut in place and move the nut further away from the limit switch.(don't move it too far so that you don't slam the gate too hard into the catch post and hurt the post/gate/motor) Turn the power back on and run it again. Repete this untill the gate is stopping where you would like it too. e-mail me with any further questions tgutierrez13@gmail.com

Jan 08, 2009 | Elite Sl 3000 Ul Sliding Gate Operator

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