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Fluid power is used extensively in forestry equipment with some novel applications of hydraulics to fell, move and process logs and trees. Hydraulic components undergo rugged use under severe conditions, over long periods of minimal maintenance. Selected hydraulic designs are illustrated and discussed. Design features for service requirements on forestry equipment are detailed.

Forecasting the sales of combines and tractors in today's ever changing and volatile marketplace is a difficult task; moreover, it is becoming increasingly important to manufacturers whose goal is to maximize profits with just-in-time policies. Farmers are independent business managers who react to a variety of factors and a unique set of circumstances. Predicting how these individuals will respond to changes in the economic atmosphere is an even more perplexing task than forecasting their business environment. Individually, some farmers may choose to postpone machinery purchases when their cashflow is reduced. Collectively, farmers react to certain factors in a more cohesive manner. For example, if farm commodity prices rise and interest rates are relaxed the agricultural sector will undoubtably increase machinery purchases. Therefore, Federal government policies and also fiscal and monetary policies affect both the farmer's income and the associated agricultural industries sales.