A control assembly for controlling the mode of all-wheel-drive walk-behind mower is provided. The control assembly includes a casing and a pair of levers extending from opposing lateral sides of the casing, wherein both of the levers are rotatable between a first operative position and a second operative position relative to the casing. Rotating both of the levers to the second operative position switches the control assembly to an all-wheel-drive mode in which a front transmission and a rear transmission are both in an engaged state resulting in the front and rear wheels of the lawn mower to be rotated by the transmissions. When both levers are in the second operative position, the levers are releasably attached to each other and can be maintained in the second operative position by the user continually grasping only one of the levers.
