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

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3/4hp craftsman will not close the door fully

New 3/4 hp craftsman-
trolly closes to up stop ok. Trolley on down cycle only moves about 36" & stops either with door connected or not connected. to it. Unit is new & has never been used since it won't close. door! Door opens & closes full up or down by hand. Safety LED's are ok & aligned. Trolley works ok within limits described above either from wall keypad or from remote control. Opener lights work ok, on & off.
Problem summarized: trolley doesn't go far enough on the track to close the door. The door has no obstructions binding or blocking down travel.
thanks, jack duboff

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  • Sears Master
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There are adjustments on the unit itself that control the distance door travels to close as well as the force it uses to close. The info and location of controls is indicated in the manual that came with your unit.

Posted on Apr 12, 2017

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Posted on Jan 02, 2017

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ctf1800
  • 4402 Answers

SOURCE: Garage Door Opener Intermittingly Reversing

try adjusted the sensor controls on the sode of the unit other wise replace the logic board
http://www.chamberlain-garage-door-openers.com/circuitboardcompatibilitychart.htm

Posted on Jan 10, 2008

  • 118 Answers

SOURCE: unable to allign inner and outer trolley on a

You probably have a stripped gear. Take the cover off the opener and the bottom will be filled with white shavings and the gear will be missing teeth. You can repair with a liftmaster gear and sprocket kit.

Posted on Mar 06, 2009

  • 2 Answers

SOURCE: garage door opener will not work after gear replacement

Mhindo,
Check this link: http://www.fixya.com/support/t519365-sear_1_2_hp_garage_door_opener_replaced

Should help. Solution 1 did it for me. My comments are under username Otrand.

Posted on Mar 21, 2009

  • 3197 Answers

SOURCE: Garage door opens 1 foot, then stops.

It sure sounds like you have a broken door spring. While you are at it remove the cover and take a good look at the drive gear. It is white nylon and is just in front of the motor. Might be stripped and unable to take the weight of the door.

Posted on Jun 24, 2009

  • 3197 Answers

SOURCE: Craftsman garage door opener 1/2 hp will not open door

It sounds like your chain is out of sync with the limit switches. Loosen the chain enough so that you can remove it from the sprocket on top of the motor unit. Now run the opener until the sprocket runs counterclockwise and stops. Now with everything attached and the door in the open position replace and tighten the chain. You are now in sync. You may need to tweak the up and down limit controls which are on the side of the motor unit.

Posted on Aug 16, 2009

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