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

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I have a Craftsman 1/2 hp opener. Yesterday I had to replace the wormgears. When I tested it before I put the chain back on the motor ran in the down direction for about 2 seconds then back in the up direction for 2 seconds and stopped. It did the same thing once I reconected the chain. I checked the limit stops and it shows that it is about half way between up and down. It is not hitting either of the limit stops and I do not have a laser sensor o the floor. I have also tried holding the wall button down, this does not make a difference. no difference with the remote either.

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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 Mar 16, 2011

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