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The common bean (Phaseolus vulgaris) is one of the most important legumes for human nutrition around the world. It is grown both for its green lobes and for its dried seeds and is the most important source of protein and nutrients for the people of the developing countries. Among legumes, beans it occupies the first place on a global scale. The main dry bean production countries are India, Brazil, Mexico and China. In Greece, in 2009, 5,599 ha were grown in the field and 278.2 ha in the greenhouses and 56,769 and 5,178 tonnes of beans respectively were produced (Mpletsos 2012). The cultivated bean is an herbaceous annual plant and its cultivated varieties are distinguished in dwarfs, climbing and semi-sprouted. Beans are harvested manually or mechanically. The mechanization of harvesting agricultural products initially contributed to lowering costs, safeguarding and increasing farm incomes, and releasing the farmer and his family from the labor. The total mechanical harvesting process can be divided into the following cutting, threshing, separation and cleaning functions. Depending on the method used for harvesting, these operations are performed by different machines or can be combined into a single machine. Bean nuts are generally harvested with conventional combine harvesters. Legumes present various problems due to the way of fruiting (lobes), and plant growth. Combine harvesters must be able to harvest the legume nuts with efficiency, low losses and low costs. These adjustments concern the harvesting mechanism, the threshing mechanism and the cleaning mechanism. Combine harvesters must be carefully adjusted and operated to reduce the amount of foreign matter and unwanted lobes, as well as harvest losses.