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

1 Answer

Garage door shakes as if off balance when closing

Our garage door shakes when closing as if it is off balance. Sometimes so much that it causes the door to either stop closing or go back up. We haven't found any obvious loose parts. The opener is a 1/2 hp craftsman. We tightened the chain. Do the door springs need replacing? They are ~10 years old.

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Sergeant:

    An expert that has over 500 points.

  • Expert
  • 227 Answers

  • The garage door may be out of balance or a spring may be broken. Close the door and use the emergency release handle to disconnect the trolley. Open and close the door manually. A properly balanced door should stay at any point of travel while being supported entirely by it's spring(s). If it does not, disconnect the garage door opener and call a garage door professional. Do not increase force to operate the garage door opener.

Posted on Feb 21, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

My garage door always stops wnen closing.sometimes it wont open.and sometimes it looks like it has no power at all and will do nothing when i press the control


Jojo, possible motor or control board issue, may have to get a garage door tech. to have a look. Befor you do check the trouble shooting links below.
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
Garage Door Opener Repair How to Troubleshoot Openers
Garage Door Opener Troubleshooting step by step
Garage Door Opener Repair Help Troubleshooting Sears PartsDirect
Home Repair Remodeling How to Troubleshoot Garage Door Openers

Jul 02, 2016 | Craftsman Garage Door Opener 1/2 HP Chain...

1 Answer

Our door didn't go down completely last night. Unplugged and replugged. It closed after that. However it also closed randomly when we went to back our cars out. Any idea if this is something going bad...


Could be the logic board is going out. Also check all of the garage door opener remotes and make sure that is not the cause. Some people will keep and extra remote in a drawer and something will touch it and activate the garage door opener. Or sometimes people keep the remote in the drink holder in a vehicle and that will activate the garage door opener.

Feb 15, 2015 | Garage Doors

1 Answer

Garage door send receive signal


Caution: do not use LED bulbs with garage door openers. They are a possible source of signal interference between the transmitter and receiver on the opener.

Mar 22, 2013 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Press the button for the garage door to go down and it will only travel a couple of inches and shakes. Unlatch the door and press the button and the door will catch the latch on the way down and close. ...


Most likely cause is the load limiters. Firstly, the door needs to work perfectly, when worked manually. No stops or restrictions through entire movement. Then reset the load limiters to spec and test again. Up limit is not extremely critical, but the close load limit can save lives and prevent vehicle damage.

Jul 23, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a 1/2 HP Whisper Drive. The lights are not working. I have replaced the light bulbs, and I can hear the relay clicking, but the lights do not come on. Other than this, the system operates...


Are you using the newer energy-efficient light bulbs? Most of the problems I have encountered are related to the newer bulbs. Sometimes they just do not make a good connection for some reason. If you are using the older-style bulb, try cleaning the contact points (with the opener unplugged of course), they can sometimes accumulate gunk.

Otherwise, it could be a loose wire- or bad receiver board. Just to make sure, though, definitely try a number of new bulbs to be certain that the bulbs are good.

Also, make sure you check the balance of your garage door, to make sure the springs are properly counter-balancing the weight of the garage door. Otherwise, the opener will work overtime and not last as long. You can see a how-to video on our website.

Feb 27, 2011 | Chamberlain 1/2-HP Whisper Drive Belt...

1 Answer

I have Craftsman ½ HP Garage Door Opener Model 139.18458D. It reopens immediately after closing. Sometimes it works normally, and sometimes gives this problem. I have tried adjusting the close force,...


It sounds like the door is traveling too far in the down direction. When it hits the floor the safety causes it to reverse to the open position. You need to adjust the 'down limit' not the force.

Sep 06, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My garage door opener suddenly started giving me problems a few days ago. it opens after i pull away so i was using it manually and now the chain came off what should i do. I also have a remote that did...


If the chain came off the bronze bushing on the gear/sprocket assembly has most likely worn out and will need to be replaced. This would also let the door close too far, hit the floor and reverse to the open position. The door also needs to be checked for balance. Weak springs can cause all this.

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

3 Answers

Garage door will not open. no lights flashing on


Check to make sure that the lasers at the bottom of the door on each side are lined up. Sometimes it is easy to bump them and then they will not see each other causing the garage door to not work. Worth a try.

Aug 07, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage Opener Model 3255 Chamberlain Lift Master


The most common cause of this problem is a bad wall control the wiring going to it. You can eliminate both temporarily by removing the wire at terminal 1 on the back of the motor unit. The wiring sometimes is shorted by the staples the installer uses. The wall control gets used a lot.

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

Not finding what you are looking for?
Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+ Logo

Related Topics:

2,652 people viewed this question

Ask a Question

Usually answered in minutes!

Top Sears Garage Doors Experts

Al Clark

Level 2 Expert

290 Answers

Cindy Wells

Level 3 Expert

4751 Answers

Pieter Vleeshouwers

Level 3 Expert

1410 Answers

Are you a Sears Garage Door Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...