Deere + Company

Stanley L Irwin

Scott Svend Hendron

Douglas Gerard Meyer

Jeffrey Alan Bauer

Donald E McGovern

Lyndall Tunell

A hydraulic drive circuit for a work vehicle including a positive displacement flow divider positioned intermediate a hydraulic pump and a plurality of hydraulic motors.

Propulsion system for a work vehicle having a single drive pump and differential capability

A grapple comprising a grapple head to which is pivotally mounted left and right tongs. Two double acting hydraulic cylinders extend between the tong pivot points and the other tong. The piston side of the hydraulic cylinders are hydraulically coupled together by a closed center flow divider valve. A cross over relief valve assembly is mounted in parallel with the flow divider valve.

Logging grapple

A secondary hydraulic steering system being automatically triggered and manually actuated. The steering system is provided with a dual displacement fluid meter having a fluid pressure sensing valve for selecting the operational configuration in which the fluid meter is operated. The fluid pressure sensing valve is hydraulically coupled to the source of pressurized fluid and in response to a loss of fluid pressure shifts the dual displacement fluid meter into a reduced displacement configuration so that the operator has greater mechanical advantage.

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Dubuque, IA, United States of America

Stanley L Irwin