Deere + Company

Gary Lee Dostal

Dennis Lee Jeffries

Gregory E Sparks

Steven D Wallestad

Robert Clayton Emmert

Ryan Philip Lindsay

A dual pump hydraulic system is provided for a vehicle driven by an internal combustion engine. The system includes a first circuit with a first high pressure pump supplying hydraulic fluid to the first subsystem at a higher pressure. The system also includes a second circuit with a second lower pressure pump supplying hydraulic fluid to the second subsystem at a second pressure. A first valve controls communication between the first pump and the second circuit. A second valve is operable to communicate the second pump with the first circuit when pressure in the first circuit is less than a second threshold pressure or when commanded by a control unit. A check valve prevents fluid flow from the first circuit back into to the second valve.

Dual pump hydraulic system

A hydraulic system is provided for an engine driven vehicle. The hydraulic system includes a higher pressure engine driven pump for supplying pressurized fluid to a higher pressure circuit via a first supply line. The system also includes a lower pressure engine driven pump for supplying lower pressure fluid to a lower pressure circuit via a second supply line. The system also includes a pressure responsive relief valve. The relief valve has a sensing port connected to the first supply line, an inlet connected to the first supply line, and an outlet connected to the second circuit via the second supply line. The relief valve opens when a demand of the higher pressure circuit is satisfied. A cut-off valve controls communication between the high pressure circuit and a reservoir, and a control unit controls the cut-off valve as a function of operation of the high pressure circuit.

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Cedar Falls, IA, United States of America

Gary Lee Dostal