The handbook contains data on the adjustments of individual units, mechanisms and systems of modern self-propelled combines "Niva" and "Kolos" and their modifications, as well as information on the preparation of the working elements of the combine for various harvesting conditions. The materials set forth in the reference book will help machine operators to eliminate problems in a timely manner, correctly carry out adjustments, maintenance and setting up the combine for high-quality work. The directory is intended for a wide range of agricultural machine operators - combines, mechanics.