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

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Craftsman 139.53600 I had to replace the main drive gear and now the door will only move 3-4 inches and then reverses from either position. I have adjusted the limit up and limit down switches to allow for plenty of movement. I have adjusted the Force up/dn. Neither worked.

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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 up 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 Apr 04, 2011

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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

Door only moves about six inches at any position


You most likely have a broken door spring or a bad drive gear. Remove the cover from the motor unit and check the gear.

Mar 04, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Have replaced drive gear on Craftsman GDO. Everthing engages and chain moves but door only opens 3 inches are so. Have ajusted opening cointrol on side to max and only 3 inches. When I unlatch GD from...


Loosen the chain enough that you can remove it from the pulley on top of the motor unit. Now with the door closed run the motor until the pulley turns in the clockwise direction and stops. Put the chain back on the pulley and tighten. You may have to tweak the up and down limits now.

Nov 14, 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...

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

Craftsman GDO, Model 139.53600. moves 4inches up/ down


Find the increase travel adjustment screw and turn it clockwise 1/4 to 1/2 turn.

Jan 14, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

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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