A hydraulic system for a gang lawn mower of the type including a tractor having a hydraulic pump and valve and motors for driving the tractor. A plurality of lawn mowers are mounted on the tractor and include cutters, and hydraulic motors drive the cutters. The pump and the valve have separate sections for operating the respective motors, and the valve has spools which can be placed in various positions for operating the motors, and there is a single control assembly for positioning the spools to achieve operational position of the motors, including traction drive of the tractor at different speeds. Hand levers and foot pedals are utilized for controlling the valve and the motors, and a lockout mechanism operates to preclude positioning of the valve in certain positions and thereby preclude placing the tractor in the transport mode when the mowers are operating, and vice versa. The mowers are pivotally mounted on the tractor and may be raised and lowered through lifting cylinders connected to respective ones of said mowers, and a hydraulic sequencing valve permits raising and lowering of the mowers in sequence to assure proper mowing action.
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