Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
Remove the cover and take a look. I'm sure you will find the drive gear is stripped. It is a white nylon gear just in front of the motor. You can buy one at any good door service company. The part number is 41A2817 and it comes with instructions.
Posted on Nov 16, 2009
I too had the same problem. However, I replaced the gear and now the motor will only run 3-5 secs.
Posted on Nov 18, 2009
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Posted on Jan 02, 2017
SOURCE: craftsman garage door opener
My problem is a little different. Chain was loose and when door hit my bumper ( car not all way in... ) chain poped off drive gear on top of opener. I got chain back on but drive gear was in a different place on chain. Door would only go down about 2 feet from floor and would hit upper limit peg at top (the one on the rail near opener motor.) I fiddled with the Up/Down adjustment screws on the side until it would go all the way up and down but it is over sensitive when down, hitting bottom and going back up or stoping about 3" from bottom with only a touch of adjustment to adjusting screw.
Should I take chain off and try to get it back in the range it was in before and adjust screws back in the range they were?
Posted on Apr 17, 2008
When mine did this, it was because the nylon gears that drive the chain had stripped. My wife had to live without the opener for a week or more, but I was able to find a new gear kit online and replace the damaged gears. It wasn't difficult.
The other option is to buy a new opener.
Posted on Dec 07, 2008
If the motor is working but the chain does not move you must remove the cover on the motor and check to see that the chain is on the sprocket. If the chain is on the sprocket and the sprocket is not moving but the motor shaft is moving then the sprocket must be retightened onto the motor shaft.
Posted on Apr 20, 2009
open the motor,is the plastic star in mothor, fix , the price is 10dlls
es la estrella de plastico que esta desgasta, solo abre el motor y cambiala por otra el costo es de 10dlls mas omenos, si nesecitas hayuda mi msm es firstname.lastname@example.org
Posted on Jan 12, 2010
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