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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