Unacceptable network of agricultural production and harvest technology results in extra-cost for farmers, losses at preservation and storage and unsafe production delivered to final consumers. The objective of this study was the investigation of the work quality for wheat harvesting based on the grain quality and cutterbar losses. To assess the grain quality, with respect to grain damage and dockage, the material other than grain (MOG) including broken grain, straw pieces, parts of chaff, foreign materials and weed kernels in grain tanks of combine harvesters were calculated. By collecting the dropped unthreshed grain on the ground and measuring their weight, the cutterbar losses were determined. It was estimated as 7% of the yield. In a bulk (sample) the pure grain was 82-87% while the MOG was 13-18%. The broken grain was 5-8%, straw and chaff was 2-5% and weed kernel was 2-5%.
