Self-propelled chassis SSh-20 is a universal four-wheeled tractor, in which the engine is located at the back, and the front part is a tubular frame. Compared to a conventional tractor in a self-propelled chassis, the center of gravity is shifted to the axis of the rear wheels, which ensures better adhesion of the wheels to the ground. The book describes: technical characteristics of the chassis, main components, electrical equipment, rules for caring for chassis components, etc.