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

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Sears Craftsman Sprocket replacement procedure

Help. My 1997 vintage 1/2 HP Sears Craftsman Garage Opener needs a sprocket assembly change. I have removed the outer casing and can see the shreds of the plastic sprocket and know i need to replace it. However i am little more challenged in not knowing how to remove and then install the sprocket. Any help would be appreciated.

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  • Anonymous Apr 02, 2008

    I replaced my gear sprocket assembly over the weekend and everything went pretty good. The problem is that when I push the button on the garage door the door only move about 2 feet in either direction. I adjusted the distance up and down but nothing. I looked at the gear that controls the distance and it seems as if the garage door is stopping before the sensor inside the opener is touched. Any ideas???

  • Anonymous Apr 03, 2008

    Need a garage door screw, which is worn down. The screw which turns the sproket to drive the chain and door. Where do I get parts for it??

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The problem lies in the RPM sensor, most likely due to the interrupter cup assembly. The interrupter cup assembly is the black cap that runs through the RPM sensor. You may have forgotten to re-attach this piece or it is probably moving too far out when the garage sets in motion. To fix this, remove the cup assembly, unscrew the two screws on the top metal piece with a 1/8 allen wrench, push the metal piece as far in as possible and put the screws back on. This will give more room for the cup assembly to spin and be read by the RPM sensor. Hope this helps!

Posted on Jul 10, 2008

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You need a gear kit. Amazon sells them. I got mine at a Sears Service center. Beware that you will need to completely disassemble your unit to replace the gears.

http://www.amazon.com/Sears-Craftsman-Liftmaster-Garage-Opener/dp/B000JGLX9C

Posted on Apr 02, 2008

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