Fleck 9000, 9100, and model 9500 Drive Motor 24 volt 50/60 Hz ( 18737 or 61633-00 ) ,with blue wire leads, is used to move pistons during regeneration.
Be Sure to Check the Condition of the Middle Drive Gear (1513502 ), as this can sometimes be the real reason the valve is not turning.
Also, the Gear usually strips because the Main Pistons and Seals need to be replaced.