Discussion
The ASAE-SAE standard for tractor 3-point hitches has been categorized as Category I to IV on the basis of
Answer: A
The categories are based on maximum drawbar power.
The ASAE-SAE three-point hitch standard sizes the hitch (pin diameters, link spacing, mast height) in Categories I to IV according to the range of tractor drawbar power each is meant for, from small tractors in Category I to the largest in Category IV.
Drawbar pull depends on speed and soil conditions as well as on the tractor, so it is not used for the classification. Engine brake power and PTO power are related figures, but the standard's ranges are stated in terms of drawbar power, the power actually delivered to a hitched implement.
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