The textbook sets out the basics of the theory of interaction of the working bodies of forestry equipment with the subject of labor wood, Component and kinematic diagrams of equipment , are considered. methods of calculation and optimal selection of parameters of structures and drive , Ways to Determine Strengths and Moments , the Forest Machine Corps , methods of calculation of loads on supporting surfaces and assessment of layout. Theoretical provisions, methods of calculation of loads and estimation of layout are illustrated by specific examples applicable to serial machines. The textbook is intended for students of mechanical faculties and graduate students of forestry universities . ;Griff:Adopted by the Ministry of Education of the Russian Federation as a textbook for students of higher educational institutions studying in the specialty "Machines and equipment of the forest complex" of the direction of training of certified specialists "Technological Machines and Equipment" .