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

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Door only opens 6in

My craftsman 3/4 hp only opens 6in, if you give it a hand by lifting on the handle it will open, but not if you use the opener on its own

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There should be 2 or 3 knobs/screws on the side to adjust torque to lift and to let down the door. Sounds like you need to increase the lift torque setting. If its maxed you can try greasing the rollers/wheels to help remove the drag. If still does not lift it then you may need a bigger motor (1hp) or you can add some springs to help lift it. Check your sensors too. Make sure they aren't being tripped at 6" up.

Posted on Apr 20, 2014

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Posted on Jan 02, 2017

  • 2 Answers

SOURCE: Craftsman Garage Door Opener

From the manual:
Security+Light Feature: Lights will also turn on when someone walks through the open garage door. With a Premium Control Console, this feature may be turned off as follows: With the opener lights off, press and hold the light button for 10 seconds, until the light goes on and off again. To restore this feature, start with the opener lights on, then press and hold the light button for 10 seconds until the light goes off, then on again.

Posted on Oct 17, 2008

  • 1 Answer

SOURCE: 1/2 hp craftsman garage door opener won't open when cold

I called Sears garage door customer service number due to the same issue. The test is to disengage the opener drive by pulling the emergency disengage handle, then open the door half way manually and then let it go. If it stays there it is a door/track/lub problem; if it drops down and closes its a garage door opener problem. Mine stayed open half way during this test so it was a door/track/lub problem. After using silicone spray on all tracks, rollers, and springs mine has been working great. Good luck.........

Posted on Dec 19, 2008

  • 3197 Answers

SOURCE: Garage door does not function makes couple of buzzing sounds only

Remove the cover and check out the drive gear. It is white nylon and is probably stripped.

Posted on Jun 01, 2009

  • 3197 Answers

SOURCE: Garage door is opening when the neighbor open theirs with remot

You say you "setup the remote and the main box but doesn't solve." I think you mean you programmed the unit but I'm not sure. Anyway try holding the smart/learn button in for 10 seconds and this will erase the memory. None of the remotes should work. Now when you are sure the neighbor will not be using their opener, program your remotes. This may be what you did but I'm not sure.

Posted on Aug 27, 2009

swolfinor
  • 504 Answers

SOURCE: garage door opening by itself

Anytime a door opens and/or closes by itself I look for a smashed wire between the motor unit and the wall button.

If the wire is smashed the insulation becomes so thin that power will leak thru the insulation and activate the door.

Loosen the staples with a small screwdriver and slide the wire about ½ inch to move any areas of thin insulation away from the staples.

The second thing would be a bad wall button or a remote with a sticking button.
Or a remote in someone’s purse that gets the button pushed by other stuff in the purse.

The test is to disconnect the push button wires at the power unit. If the self operation stops you have located the problem. If you reconnect the wires and disconnect the wire at the wall button this will tell you if the problem is the wire or the button.

Posted on May 27, 2010

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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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It could be that your door is binding on the way up and so it stops automatically. Try releasing the emergency pull cord and move the door up and down by hand to see if it is binding, probably near the bottom. The track may be misaligned or there could be something rubbing against the door.

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I have a craftsman 3/4 hp 315 mhz garage door opener model 13953990ds when ativating it to open it only moves 6 to 8" forward and back and stop. i have tried all steps in the manual can get it solved


If you've readjusted the opener, and it still isn't working, you need to have a trained door technician come out and adjust the tension on your springs. To determine this, pull the red release handle to disengage the opener from the door, and try to lift your door by hand. You should be able to move the door easily, and it should stay at the half open point without falling or rising. If the door is hard to move, excessively heavy to lift off the ground, or will not stay open, the door itself is the culprit. If the door is fine, the opener will need to be serviced.

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not sure, but see the users manual here:

http://www.manualslib.com/manual/32293/Craftsman-139-5399.html

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1 Answer

I have replaced the worm gear assemble twice in my craftsman 1/2 hp garage door. what am i doing wrong. why does it keep turning to dust


Use that small tube of grease in the kit and smother the gear teeth with it. Use it all. Also disconnect the opener from the door and lift the door by hand. It could be the springs are either broken or so heavy the opener can't survive lifting it.

Feb 12, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

When I push the button to open my garage door, the


Remove the cover and take a look at the drive gear. It is white nylon and is just in front of the motor. It is probably stripped. It is a good time to release the door from the opener and try raising it by hand. Your door springs may be weak or possibly broken.

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

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Chamberline 1/2 hp belt drive opener that stops opening


It sure sounds like a broken spring. Sometimes the break can be difficult to see. How heavy is the door to lift manually. This will give you a good idea.

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

1 Answer

Needs proper adjusment procedures


Check if your garage door is properly balanced. Pull the red handle to release the door and manually open it. It should stay up when opened all the way. Next, pull the door down to waist level. It should stay there. If not, the lift springs need adjustment, and that may be why the opener keeps reversing.

May 06, 2009 | Office Equipment & Supplies

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