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

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I just replaced the gears in the opener and now the door stays open about 2 ft. When I hit the button it closes about 1 ft. and returns to it's original position...

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Loosen and then remove the chain from the sprocket above the motor. Run the opener until the sprocket has turned in the counterclockwise and stopped. Now with the door in the open position replace the chain on the sprocket and tighten. This will get you close and minor adjustments to the up and down limits may be needed.

Posted on Jul 23, 2009


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I am following the directions. I have tried button #1 and #2. My garage door opens at 2 ft. I hit the button again it goes another 2 ft. and so on each 2 ft. it will close properly . Whats the deal ??

as it requires extra power to lift the door, it may be overloading on the current setting.check the wires and connections for the full up micro switch as it may be playing up as the door comes up.

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Craftsman Door Opener Model #139 53975SRT1 1/2 HP will not open the garage door. It will close it. And if it's on the way down and I hit enter, it will open mid stream. But, if it's closed, an

Two things. Check for a broken door spring. If okay, remove the cover from the motor housing and check for a bad drive gear. This is a white nylon gear just in front of the motor. If it is going bad it should be obvious.

Jul 05, 2012 | Sears Craftsman LiftMaster Chamberlain...

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I have a Craftsman 1/2 HP garage door opener, the left sensor is orange and the right sensor is green. the problem is that when i try to open the door, it only opens about a half foot and stays there. i...

Nothing wrong with the sensors and they only work when the door is closing anyway. Sounds like you may have a broken door spring or a bad drive gear. The drive gear is white nylon and is in front of the motor. It will be obvious if it is going bad.

Dec 14, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

The sensor lights are steady. The opener cycles fine withouit the garage door connected. Everything worked fine until yesterday. I hit the open remote and the garage door did not open. I hit close and it...

Remove the cover from the motor unit and check the drive gear. It is a white nylon gear just in front of the motor. Also check the door springs. One of them could be broken.

May 31, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door will not close, moves 2 ft & returns

Make sure you put the black cup back onthe end of the motor shaft and that it is pressed all the way on.Make sure the RPM sensor is plugged in. If neither of these are theissue, then you probably did not have the motor shaft pushed all theway back when you tightened the coupler after replacing the wormgear. Loosen that coupler up and from the front of the motor(opposite end in which the coupler is on) push the shaft back as faras it will go. Hold it there while you tighten the coupler back upand then try it.

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

2 Answers

Garage Door Wont Close Craftsman 1/2 HP (1998)

What it is is the electric beams at the door are getting blinded buy the sun or out of line. They are the two black boxes on both sides of the door about a foot from the ground. Put a piece of card board in front of them not blocking the beam dut to block the sun. All that they are is safety beams for kids so they do not get hurt. If you have to move them to the top where the sun will not hit them. Sorry to say though you can not remove them all the way. Also make sure the lite on them is not blinking if so they are out of line.

Good Luck and Please Rate FixYa!

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

1 Answer

Garage door opener does not reverse after hitting obstruction

release the door from the opener and see if door moves freely the check proper torsion by moving door up to 3-4 ft if it stays in this area torsion is properly set if not call technician to adjust torsion
if door does not move freely all the way up and down check for binding track alighnment and roller condition. the adjust closing pressure.

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

1 Answer

Garage opener cannot close, just replaced gears.

If the unit has photo eyes that could be your problem. not reattching the 4 wireing harness from the limit assy. can cause a similar issue.

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Garage door won't close.

After replacing the worm gear and main drive gear on my Craftsman 1/2 HP garage door opener I found that my door moved about 4 inches stopped and reversed the same distance. I checked all the settings and everything seems OK. What fixed the problem was I released the two allen set screws on the end of the motor shaft and pulled tha motor shaft toward me. When I replaced the black plastic cap that looks like a pill cap top on the end of the shaft this corrected the depth setting that cap rotated through the RPM sensor. I set the limit settings (up and down) on the side of the opener and reset the force pots marked (KC) to mid range.
the door now works. I hope this helps. I also checked and eliminated the door sensors by putting a box in the beem this inhibited any movemnet at all, so I knew it wasn't the door sensors as there was at least 4 incheds of movement prior to the box and nothing with the box.

Oct 27, 2008 | Sears Craftsman LiftMaster Chamberlain...

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