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

1 Answer

Garage door opener does not work correctly

I have a craftsman half horse power garage door opener that only opens six to twelve inches most of the time, and some time i works great. the make and mdl# Sears craftsman 1/2 hp md-139.53672SRT
Can you help?

Posted by on

  • 1 more comment 
  • jz-ct Feb 23, 2008

    Same problem- both doors only open appx. half-way. The issue started with one door and the second door began having the same problem about 4-weeks after the first. Tried the limits and travel adjustments without and luck. I asked Sears but the only suggestion they had was to send a repair crew out at big $'s. It will probably be cheaper to buy a new (different brand) opener. Any help would be appreciated.

  • Anonymous Dec 19, 2008

    I'm having the same problem door opening halfway need help.

  • bigallf Dec 19, 2008

    Does anyone have any idea why the garage doors only open a few inches or in other cases only halfway.



1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.

    Vice President:

    An expert whose answer gotĀ voted for 100 times.


    An expert who has posted more than 50 answers, of which 90% or more were rated as helpful.

  • Expert
  • 95 Answers

Make sure the door springs on the door are ok.Unhook the opener from the track by pulling the red handle rope on the track,make sure the door moves up and down freely.There is a up-force adjustment on the end of the opener that the small wires run to,you will see 2 slotted adjuster screws,find the one labeled up force,turn it clockwise a little bit(1/16th of a turn).Also there is a plastic gear inside the case that gets dry,unplug the opener,remove the 8 screws that hold the case on and lube it with a lithium grease,see if it is worn badly while you have the case off.

Posted on Aug 12, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

My Craftsman garage door will not close, only a few inches at a time

have a problem which returns every year when outdoor temperatures drop close to freezing. garage door will open only a few inches, then stops. I can close it and try opening it again... same result. After five or six such attempts it typically will open. Interestingly, when I push the switch button mounted on the interior wall of my garage and keep it pushed, the door will open, until I release the button at which point it stops opening.

Dec 19, 2013 | Building Materials

1 Answer

The motor in the openner is not running at all, 1/2 horse power crafman. 315mhz garage door openner,model 139.53914D

Have you checked the house circuit breaker? Do the lights come on? Is the door stuck in the open position?

Dec 30, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Sensor not working on my craftsman half horse garage door opener.

Make sure the sensors are pointed at one another. Each has a small light that must be lit and not flickering. Tweak them a bit. If you cannot get both lights to come on you need to replace the sensors.

Sep 05, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman 1/2 HP garage opener opens only 6 inches

Remove the cover and check the drive gear. It is white nylon and is just in front of the motor. It may be stripped. Take a close look at those door springs. They can sometime appear to be okay when one is broken.

Oct 10, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opens randomly then closes

This is most commonly caused by a bad wall control, the wires going to it or a remote with a shorted switch. You must use a process of elimination. Heavy dew or rain will not cause this.

Oct 09, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My garage door opener moves about 8" then reverses direction before touching the limits

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 most likely stripped. You can purchase a new one at Sears or any good door opener company. It comes with instructions.

May 31, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door will not open properly

You might have a broken spring. Check on the a the header above the door there should be a tube with a drum on each end and 2 springs (maybe one) towards the center. If one of the springs has a gap (1-2 inches) in it. If it does you will need to call a door company in your area. I recommend you replace both springs. If you need to get you cars out some times you can help the operator to lift the door by lifting the door while the operator is lifting the door. Be very careful not to get your fingers in a pinch point and be sure to lower the door the same way.

Feb 01, 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

515 people viewed this question

Ask a Question

Usually answered in minutes!

Top Sears Building Materials Experts

Glenn Mayer
Glenn Mayer

Level 2 Expert

91 Answers


Level 3 Expert

4354 Answers

Cindy Wells

Level 3 Expert

5524 Answers

Are you a Sears Building Material Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides