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

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Craftsman garage door opener model 139.53985dm wont open door completely

I bought a Craftsman garage door opener 2 weeks ago and it is taking forever to get it installed. I have a couple of questions. It is model number 139.53985DM. Is the trolley supposed to stop prior to getting to the rubber stop just in front of the motor unit? it is stopping about 6 in, im guessing, before the stop, and not opening the door all the way The garage door opener is covered under manufacturer warranty and it is good till 07/12/2013. we have tried adjusting thetravel limits and it doesnt change anything. also, there is a purple wire hanging from the motor, is that supposed to be connected somewhere

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SOURCE: garage door opener will not work after gear replacement

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Posted on Mar 21, 2009

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SOURCE: Craftsman Garage Opener (Unit run front & back only for 2 second)

Double check to make sure the sensors are wired correctly. The 2 solid white wires go to terminal 2 and the wires with black stripes go to terminal 3. If the wiring is correct then you possibly have a bad RPM sensor. The RPM sensor is a small circuit board just in front of the motor.

Posted on Jul 13, 2009

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I installed a Craftsman garage door a couple of weeks ago and all of a sudden it keeps opening by it's self. It is model #139.53918D what is causing this?


Make sure the door isn't closing too far. This will cause it to open. Your opener comes with a warranty. Call Sears repair.

Sep 04, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My craftsman 1/2 hp garage door goes up only about


Release the door from the opener and operate the door by hand. Check the weight of the door. If it is heavy check the door springs. One could be broken. Also take another look at the gear you replaced. Did you use the lubricant on the gear? If not the gear will not last.

Mar 02, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman garage door opener won't close completely


look on the side of the openeer usually lekt looking at it from the rear theese are your travel adjusters one turn = 2" travel normally

Jan 07, 2009 | Sears Craftsman LiftMaster Chamberlain...

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