A control system for a cutting reel unit includes a height-of-cut adjusting system and a reel-to-bedknife clearance adjusting system. The reel mower cutting unit may be manual or self-adjusting. In the manual mode, adjustments can be made by engaging and turning an adjustment actuator on the side of the cutting reel with a hand tool such as a socket wrench. In the self-adjustment mode, adjustments can be made by engaging and turning adjustment actuators with an output shaft of an electric motor. The same adjustment actuators are used in both adjustment modes, and the reel cutting unit may be converted between modes by fastening or unfastening electric motor assembly from the unit.