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The 70 Series 4WD tractors offered by John Deere has been replaced by a new 9000 product line as part of the continuous improvement process to meet customer needs and provide a product with maximum value to our customers. The new model lineup is 260, 310, 360, and 425 engine HP. All models are powered by John Deere engines with the largest 3 models using the new 10.5L and 12.5L engines. The new line of 9000 Series tractors is a styled tractor family which uses many of the 8000 Series Row Crop tractor concepts and designs. This new product line provides improved operator comfort, enhanced operator conveniences, and simplified serviceability.

The product line of 4WD tractors offered by John Deere has been updated as part of the continuous improvement process to meet customer needs and provide a product with maximum value to our customers. The new model lineup is 250, 300, 350 and 400 engine HP. Per customer requests a new model has been added to the prior model lineup at 350 HP. The new models expand the usage of electronic engine control, enhance the engine power curves for increased productivity, provide improved operator comfort, enhance conveniences available to the operator, provide added improvements for serviceability and revises the options available for the customer so that he can purchase the product of maximum value for his needs.

The 9000T track-type agricultural tractors mark John Deere's entry into the high-horsepower, track tractor market. The 360-HP 9300T and the 425-HP 9400T tractors were designed with input from customers to meet customers' needs. Through customer input, on-farm research, and common sense, these tractors have been designed to work light in the spring, heavy in the fall, handle steep hillsides, turn under load and pull like a locomotive. Incorporating many of the already-market-dominating features of the 9000 wheel tractors plus innovative track vehicle features such as the wide stance, long wheel base, controllability, power, and versatility, these machines are truly amazing.

The difficulties and complexities associated with manual backup steering have increased as off-road vehicles have become larger. System components must be optimally designed to produce the most efficient manual steering. To efficiently transfer power from the human operator to the steered wheels, the characteristics of the steering wheel with metering pump must be impedance matched to the operator. Knowledge of the torque-speed characteristics of a human, as related to a steering wheel, is required to determine the maximum power transfer point for impedance matching. Published literature provides little information on human power capabilities in this context. To better define the human power characteristics a study was undertaken at the John Deere Product Engineering Center, Waterloo, Iowa. This paper deals with the results of that study.