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

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Belt drive sears opener, new, will only open halfway, why?

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Depending on model there are 2 two controls for up/ down travel of the opener. This is known as the limit switch. When the opener runs a gear moves 1 switch at time and when the switch closes the motor shuts off.There are arrows next to each control which will tell you which way to turn knob to increase the travel.if already maxed out will will need to remove cover and look at the switches. You can remove the tiny gear clip, take off the gear and manually move it in to the position you need. good luck

Posted on Jul 04, 2010

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41a4315 7a parts


The gears are all the same with the exception of the belt drive units that have a different top sprocket , you can find the part # on the internet simply by putting in the model # of your opener and identifying whether you have a belt drive or chain drive machine , you can also find the part on Ebay by putting sears/liftmaster or chamberlain sprocket gear assembly in the description ....All 3 of those models are made by Liftmaster being the main Brand ! Liftmaster manufactures the sears craftsmen for Sears and also goes under the chamberlain brand name that k mart and Home depot and Lowes sells ! Liftmaster is the worlds largest manufacturer of garage door openers and all 3 machines are interchangeable with their parts ! Hope this helps you Sincerely Glenn

Sep 01, 2014 | Sears Craftsman LiftMaster Chamberlain...

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Garage door has opened a couple of times in last few days without using any of the controls, even when no one was at home. This is a nearly new Sears 1/2 HP belt drive unit.


Make sure none of the staples used to hold the wiring to the wall control have cut through the insulation. This is the most common problem.

Sep 27, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My belt broke on my model 139.655000 sears robust automatic garage door opener. I have misplaced the belt and don't know the length of the belt to buy a replacement. Do you know the belt i need?


The part number for this belt is STD303310 and is available from Sears for $4.49. I would almost bet you that any good door opener service company in the yellow pages would have one on the shelf.

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

1 Answer

The garage door opens halfway and then stops; it will close completely however


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

Jun 20, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Replace drive belt on garage door opener craftsman. What do I take apart so I can replace belt


On page 10 and 11 of your owners manual it shows how to connect the belt to the trolley. You should be able to reverse these instructions.

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

1 Answer

Door opener just stops halfway down and blinks


You may have more than one problem. If it is the main light that is blinking when the opener stops and it blinks 10 times you have a door sensor problem. I think you also need to remove the cover and check the drive gear. It is a white nylon gear just in front of the motor and may be stripped.

Sep 23, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman Garage Door Does Not Open


Take a good look at the door springs. Might have a broken one. Also remove the cover and look at the drive gear. It is white nylon and is just in front of the motor. Could be stripped.

Sep 18, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Sears garage door opener only open half way going up..


this one is easy...there inside your garage door opener, the one on the top of your ceiling in your garage has little like knobs ..mine has a straight like screw driver circles attached to knobs. Round dials with screw driver like knobs on top of them...they are adjustable. your "tune" them until they just stop where you want them, don't forget to grease your chain, keep your tracks clean of dust, and make sure your safety "stops" are working properly so that if children are in the way, it will stop. Also..make sure there is nothing in the way of the track. If the sensor "senses" a block...that will also cause it to stop halfway. Now if you could tell me how to change my combination on my keypad...I'm all set.

Apr 15, 2009 | Sears Craftsman LiftMaster Chamberlain...

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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

Apr 05, 2009 | Sears Craftsman LiftMaster Chamberlain...

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