Tractors are very versatile machines, but the range of uses is too wide for one machine to be successful in all of the possible jobs. Tractor manufacturers target tractor designs for different categories of use. These category boundaries are not ridged, but if owner/operators push the boundaries too far, the tractor can fail which may lead to an accident which damages the tractor or implements. It can also result in injuries for the operator or bystander. It is important, therefore, for the owner/operator to have a basic understanding of the common categories of tractors. This chapter will also explain how stationary engines and tractors are derated, and how tractors are tested.

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