Deere & Company

Charles D Isaacson

James Arthur Nagorcka

Dale H Killen

The invention is directed to a hydraulic tensioning and suspension system having a main drive wheel located above and between two idlers that are mounted to pivot arms that are coupled to a rigid frame. In addition, two track rollers are mounted to the rigid frame by an intermediate arm and a third track roller is mounted to the front pivot arm by an additional pivot arm. Four hydraulic suspension cylinders are hydraulically coupled to one another for biassing the idlers and track rollers downwardly to provide a suspension system. The rear pivot arm is a telescoping arm having a hydraulic tensioning cylinder. A two position control valve supplies hydraulic fluid to the hydraulic tensioning cylinder in response to a speed ratio selected by the operator. With higher tension being applied to the track when the vehicle transmission is in low gear and lower tension is being applied to the track when the vehicle transmission is in higher gears.

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Colona, IL, United States of America

Charles D Isaacson