Patent ID: 8636078

Claim:
A hydraulic control apparatus for an agricultural implement, the implement having a stationary frame and a number of foldable frame sections pivotably coupled to the stationary frame, and a plurality of ground engaging tools mounted to the stationary frame and the number of foldable frame sections, the apparatus comprising: a fluid supply port for coupling to a fluid supply line of a towing vehicle; a fluid return port for coupling to a fluid return line of the towing vehicle; a first hydraulic system that controls weight transfer to the plurality of ground engaging tools, the first hydraulic system in fluid communication with the fluid supply port and the fluid return port, and including a first set of mechanically controlled hydraulic valves; a second hydraulic system that controls folding and unfolding of the number of foldable frame sections, the second hydraulic system in fluid communication with the fluid supply port and the fluid return port, and including a second set of mechanically controlled hydraulic valves; and a linkage arrangement that mechanically opens and closes the second set of mechanically controlled hydraulic valves in response to movements of the number of foldable frame sections.