Loosen the chain enough
so that you can remove it from the sprocket above the motor unit.
With the door closed run the motor until the sprocket turns clockwise
and stops. With everything attached replace and tighten the chain.
Some adjusting of the up and down limits will probably be required.
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.
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motors rarely go bad. open coer. are gears stripped. (Does not stop running or does door stop moving).
need a little more info. What brand is your opener? How old? does your door work well by hand?
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