Deere + Company

Chad E Schoneman

David LaVerne Sprinkle

Craig Alan Puetz

Brian E Biles

John P Kruckeberg

Harry Kay Voelp, Iv

Tejal Sarda

Steven P Forssberg

Mark A Herman

Julie B Kuyath

A hydrostatic transmission control system includes a controller that monitors inputs for shifting a transmission of a tractor to a different range gear; determines if an engine on the tractor is operating in a desired and acceptable shift range based on a sensed speed and a load of the engine, and determines if a hydrostatic transmission on the tractor is operating in a desired and acceptable shift range based on a sensed load and a speed of the hydrostatic transmission. If the controller determines the engine and the hydrostatic transmission are operating in the desired and acceptable shift range, the controller commands an oncoming clutch to ramp up and an off going clutch to ramp down, and synchronizes speeds of the engine and the hydrostatic transmission.

Hydrostatic transmission control system

A PTO clutch includes a lubrication shut-off valve that can slide between a first position blocking a port for lubrication oil to lubricate the PTO clutch, and a second position opening the port to lubricate the clutch. A relief valve is provided in the lubrication shut off valve, which opens in response to pressure spikes of activation oil and isolates the pressure spikes from the clutch piston.

PTO clutch with lubrication oil shut-off valve and integrated relief valve

Growing community of inventors

Waterloo, IA, United States of America

Chad E Schoneman