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In Brazil, beans are generally harvested in two stages, in the first one the product is dug manually and in the second stage the product is picked, threshed and cleaned using a bean combine. The combines used are generally pulled by a tractor. The design of these machines was done by trial and error. In this paper, a simulation model is presented to analyze the dynamic behavior of bean combines. The simulation model was developed using ADAMS version 10.0. This model included a soil/tire interface model, a power train simulation model and a threshing and cleaning models. Finally, an analysis of the combine dynamic behavior was done.