Patent ID: 6302220
Filing Date: 2001-10-16
Classification: A01B

Abstract:
In an agricultural implement having a frame having a pair of tool-carrying wings pivotally mounted thereon for pivotal movement between raised transport positions and lowered ground-working positions; a hydraulic wing actuator connected to each said wing, said hydraulic wing actuator being extendable and retractable for effecting said pivotal motion, the improvement comprising:a hydraulic wing actuator circuit connected to each of said wing actuators, which circuit, when connected to a tractor hydraulic system, enables said wing actuators to apply down pressure to said wings when the wings are in the lowered working positions, said circuit including a hydraulic pressure control valve means having at least one pressure relief valve for controlling the down pressure exerted by said wing actuators, said circuit further including a ball valve operatively connected to said wings to move to a closed position when said wings are moved to a predetermined position, the movement of said ball valve to a closed position disabling said at least one pressure relief valve.