According to the manual for your 61 v-ride.
4.6 ENGAGING THE DECK DRIVE (CUTTER BLADES) 1. Set the throttle at about 3/4 speed. Do not attempt to engage the deck drive at high speed as this shortens the electric clutch life — use only moderate engine speed when engaging the deck drive. 2. Engage the deck drive by pulling out on the yellow switch, located on the instrument panel, to the engage position. See Figure 4-4.