Abstract: A radial frequency of clip control system includes a steering angle sensor for a steerable rear wheel of a grass mowing machine, a pedal sensor for sensing an operator input for a desired ground speed at a reference point adjacent an operator seat on the grass mowing machine; and an electronic controller that uses the desired ground speed and location of each of a plurality of reel cutting units to calculate a rotational speed for each of the plurality of reel cutting units.

Abstract: A radial differential speed control system includes a steering angle sensor for a steerable rear wheel, a pedal sensor for sensing an operator input for a desired ground speed at a reference point adjacent an operator seat, and an electronic controller that uses the desired ground speed to calculate differential speeds of a left front drive wheel and a right front drive wheel to reduce the ground speed of a grass mowing machine when the steering angle sensor indicates the steerable rear wheel is turning.

Abstract: A mower cutting unit lift system includes a rotary motor connected to a power supply and turning an output shaft connected to a bell crank. A flexible link between the bell crank and a lift arm is used to lift a cutting unit to a transport position if the rotary motor turns the output shaft and the bell crank in a first direction, and lower the cutting unit to a mowing position if the rotary motor turns the output shaft and the bell crank in a second direction.