Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
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.
You should also loosen the chain enough that you can remove it from the sprocket above the motor. Now with the door closed and everything else attached run the motor until it runs clockwise and stops. Replace and tighten the chain. Some adjusting of the up and down limits will be required.
Posted on Nov 16, 2009
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Posted on Jan 02, 2017
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