Abstract: 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.

Abstract: A friction disk for a frictionally acting device includes an annular friction surface having an inner edge and an outer edge. Grooves are formed in the friction surface. The grooves include a plurality of radially extending inner grooves which communicate with the inner edge. A plurality of radially extending outer grooves communicate with the outer edge. A plurality of branch grooves communicate each inner groove with a pair of the outer grooves, and communicate each outer groove with a pair of the inner grooves. Each inner groove is aligned with a corresponding outer groove. Each branch groove intersects with another of the branch grooves. Each inner groove has a width which is greater than a width of a corresponding outer groove.

Abstract: A final drive comprising a lubrication system is provided. The final drive comprises a differential housing and a reaction plate, wherein the reaction plate is mounted to the differential plate. The final drive also comprises a shaft and a friction disc. The shaft is rotatably disposed with differential housing, and the friction disc, which has a lubrication hole, is mounted about the shaft. The lubrication system comprises a differential supply passage positioned in the differential housing, and it also comprises a plate passage positioned in the reaction plate. The plate passage is in fluid communication with the differential supply passage, and the plate passage is in intermittent fluid communication with the lubrication hole.

Abstract: A final drive comprising a lubrication system is provided. The final drive comprises a differential housing and a reaction plate, wherein the reaction plate is mounted to the differential plate. The final drive also comprises a shaft and a friction disc. The shaft is rotatably disposed with differential housing, and the friction disc, which has a lubrication hole, is mounted about the shaft. The lubrication system comprises a differential supply passage positioned in the differential housing, and it also comprises a plate passage positioned in the reaction plate. The plate passage is in fluid communication with the differential supply passage, and the plate passage is in intermittent fluid communication with the lubrication hole.