Patent ID: 7918285

Claim:
An implement hydraulic system for use with a tractor having a load sense controlled pump and a multi-position selective control valve (SCV) having a closed neutral position, a first open position and a second open position, the SCV connected between the pump and the implement hydraulic system, the implement hydraulic system comprising: an implement wing cylinder structure having first and second ends; an implement center frame cylinder structure having first and second ends; an adjustable pressure valve, having an input and an output, connected between the selective control valve and the wing cylinder structure second end; a power beyond supply connection from the pump to the input of the adjustable pressure valve, the power beyond supply connection providing a source of hydraulic fluid under pressure to the adjustable pressure valve independently of hydraulic fluid under pressure from the selective control valve; a load-sense connection from the output of the adjustable pressure valve to the pump; latching valve means in the power beyond supply connection for opening and closing the connection, the latching valve means operable to close the connection until after fluid pressure from the selective control valve has been applied to the second end of the wing cylinder structure after which the valve means opens the connection and maintains the connection open when the selective control valve is returned to the neutral position; a first sequencing valve to direct fluid to the first end of the wing cylinder structure then to the first end of the center frame cylinder structure when the SCV is in the first open position; and a second sequencing valve to direct fluid to the second end of the center frame cylinder structure then to the second end of the wing cylinder structure when the SCV is in the second open position.