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

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Location of reset button on sears model 139.664300

Motor runs but chain not moving

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Your plastic gear is stripped out on your opener. You can buy them from sears if you think your handy enough. make sure to have the opener and the chain in the down postion an d unplugg the opener

Posted on Feb 11, 2009

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I have a Craftsman 1/2 hp, mod # 139.53603. When I press the remote or the panel button there is a humming sound from the motor. I opened the panel on the back and did not see anything out of line, etc. ...


Is the trolley jammed against the bolt just in front of the motor? If so, loosen the chain until the tension is off the trolley and then run the motor until the door is closed. Now locate the up 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.

Jan 25, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I press the button to close the door and i hear a click at the motor and nothing happens


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 take the strain off the chain and run the motor until the door is closed. While the door is closed locate the 'up limit' control on the side of the motor unit. Turn this 2 full turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

Nov 02, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I am having a problem with my garage door opener. It just clicks. Its a craftsman opener. The lights are on but it does not move when the button is pressed.


If your door is stuck in the open position it is probably because the trolley is jammed against the bolt just in front of the motor. If so, loosen the chain enough to release the pressure on the trolley and run the opener until the door is closed. With the door closed locate the 'up limit' control 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.

Apr 06, 2010 | 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...

1 Answer

I have a Sears Craftsman 1/2 horse garage door opener. When I push the button, I can hear it hum, but the chain won't move and it seems the sprocket is frozen?


If your door is stuck in the open position you will find the trolley is jammed against a bolt just in front of the motor unit. Remove that bolt and run the opener until the door closes. Now locate the 'up limit' control on the side of the motor unit and turn it 2 times in the opposite direction of the arrow printed on the cover. Replace the bolt.

Sep 03, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage Door opened but will not close. I opened


I think the trolley has jammed against the bolt just in front of the motor unit. Remove the bolt and then run the door until it is closed. With the door closed locate the 'up limit' control on the side of the motor unit. Turn this 2 turns in the opposite direction of the arrow printed on the cover. Replace the bolt.

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

1 Answer

Motor run chain not moving when i hit hardwired stop and start button


You need to check the drive gear. Remove the cover and it is a white nylon gear just in front of the motor. Most likely stripped. The part number is 41A2817 and is available from Sears or any good door opener service company. It comes with instructions.

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

1 Answer

Sears/Craftsman Garage Door won't budge


with the door down, disconnect with the emergency release, see if the motor operates
with no load...if the the track moves you probably have something obstructing the door
ie; a broken spring, door locks, etc ... the chain should be adjusted for just a little
**** mid way down the rail (1/4") if it still doesn't move ... call sears.

Mar 14, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Motor sounds like it is running but sprocket doesnt move


how old is unit. sounds like gears are shot, takes $25 of parts and 2-3 hours to fix if you are handy. Take cover off, If it has white powder (Not ****), gears are shot.

Jan 14, 2009 | Sears Craftsman LiftMaster Chamberlain...

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