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

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I replaced the gears in the craftman garage door opener. Now it only moves about a foot and immediately reverses!

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DID YOU REINSTALL THE LITTLE "CUP" ON THE MOTOR SHAFT.

IT MUST BE INSTALLED AND PUSHED UP SO THAT IT IS PICKED UP BY THE RPM SENSOR.

THIS WOULD GIVE YOU WHAT YOU DESCRIBE.

Posted on Jun 07, 2010

Testimonial: "if you mean the black plastic piece on the end, yes it has been reinstalled"

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My craftman garage opener will not close. The up arrow blinks 3 times and the down arrow blinks 2 times. the button on the unit will not open or close it. It will move about a foot then reverse back.


try holding in the wall button the whole time. if the door closes, then you have an issue with the sensor wiring. if the wall button closes the door while holding in, then post a comment below and we will tell you next steps.

Oct 02, 2015 | Building Materials

1 Answer

Sears Craftman Garage Door Opener sticks in cold weather. Sometimes have to put foot under it to make it go.


Check the door springs. You could have a broken spring. Check the tracks for grease. Should be no grease applied to the tracks. You also need to remove the cover from the motor unit and check the drive gear. It is a white nylon gear just in front of the motor and could be going bad.

Jan 21, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftman garage door opener closes via the key pad and immediately reverses and reopens. have adjusted travel limit as well as force. Any suggestions


If the main light flashes 10 times when the door reverses it is a door sensor problem. Make sure they are pointed at one another and the small light on each one is lit and not flickering. Tweak them a little. If you cannot get both lights to come on you have bad sensors or the wiring to them.

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

1 Answer

My Sears Craftman garage door opener closes about 1/3,stops,and reverses.When I activate the remote again it stops rising,starts down again, comes down another foot or so,stops,reverses etc.,etc,etc It...


If the main light is flashing 10 times when the door reverses it is a door sensor problem. One may have been bumped so that they no longer point at one another. Make sure the small light on each sensor is lit and not flickering. If this isn't the case you might need to increase the down force a little. The control is on the back panel near where all those white wires go. Increase it about 1/4 turn and try.

Dec 16, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Sears Craftman Garage door opener model # 41a3493-1. Does it have auto reverse?


That isn't the model number you give it is the part number for the logic board. The model number is on the opposite end of the motor unit and starts with 139. If you are asking if the opener should reverse when it hits an obstacle the answer is yes. If it doesn't it is not adjusted correctly or is faulty.

Dec 01, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftman door opener brand new wont work?


Sounds like the drive gear is stripped. Remove the cover and take a look. It is white nylon and is just in front of the motor.

Jul 04, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

3.75 craftman garage door goes down a foot then immediately reverses back up


If when it does this your main light flashes 10 times it is the door sensors. Make sure they are aligned properly. If the main light doesn't flash 10 times then you most likely have a bad RPM sensor board. It is a small printed circuit board just in front of the motor.

Jun 28, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Garage door opener will not work after gear replacement


From your description it sounds like you forgot to plug in the RPM sensor.

Mar 16, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener will not work after gear replacement


check the end shaft platic cap is installed and runs freely between the rpm sensors.. that might be ur problem..

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

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