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

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SEARS GARAGE DOOR OPENER

SEARS DOOR OPENER move 2 ft &stop after replsce gears & SOME TIME REVERSE & MOVE GO 2 FT

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Make sure you put the black cup back on the 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 the issue, then you probably did not have the motor shaft pushed all the way back when you tightened the coupler after replacing the worm gear. Loosen that coupler and from the front of the motor (opposite end in which the coupler is on) push the shaft back as far as it will go. Hold it there while you tighten the coupler back up and then try it.

Posted on May 30, 2009

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Sears Garage Door opener lifts part way and stops. Connected to rail or not. Sensor circuits are working. I read that the RPM sensor would cause this if it's going down but this one is stopping while...


On the rear of the motor unit you will find the 'up force' adjustment. Increase this about 1/4 turn and try. It is also a good time 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 it will be obvious if it is going bad. A bad RPM sensor will cause the door to stop when the door is opening and reverse to the open position when closing.

Mar 22, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

1/2 hp craftsman door opener moves about 12 inches then reverses back & thats all it will do. just replaced the main two plastic drive gears whenthis started


First try adjusting the force limits. They are up on the motor head. If this works do a 2x4 safety reversal test afterward. It also may be the rpm sensor. Sometimes this can go out with the gears. There is an led light on the motor head. If it is flashing 5 times in a row then it is this for sure. You can get replacement parts at searspartsdirect.com. Thanks BB

Sep 19, 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...

1 Answer

Garage door only opens 4 inches then reverses and stops


you need to replace gear when the door is fully closed. then do your tweaking.

Jun 01, 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...

4 Answers

CRAFTSMAN GARAGE DOOR OPENER PROBLEM


i have a garage door opener craftman 1/2 hp model 13953985 the light is flashing 10 times . now you have too hold down on the button to raise and lower .

Feb 15, 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...

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