The directory was created by leading specialists of KhTZ and GSKBD (Head Specialized Design Bureau for Medium Power Engines. Kharkov). It contains basic technical data about the tracked tractor T-150 and wheeled T-150K (technical characteristics, adjustment parameters, etc.). A brief description of the design and operating features of mechanisms and units is given, maintenance rules, methods for aggregating tractors with agricultural machines and tools are described. The publication is designed for machine operators and engineering workers related to the operation of tractors T-150 and T-150K.