Abstract: A motor coupling assembly for a mower cutting unit includes a coupling ring connected to the mower cutting unit. The coupling ring includes a coupling face having female ramp elements created in the coupling face. Magnets are positioned about the coupling face each including a face positioned substantially coplanar with the coupling face. A ring member connected to a motor includes a ring face having male ramp elements equal in quantity to the female ramp elements. The male ramp elements extend outwardly from the ring face and engage within the female ramp elements. The ring face is retained in contact with the coupling face by only a magnetic force of the magnets. The ring member is rotationally locked with respect to the coupling ring by complete engagement of the male ramp elements within the female ramp elements.