The textbook presents in an accessible form the main provisions of the theory of electrohydraulic systems and equipment of modern transport and technological machines used in various fields of technology, in particular, in the forest complex. Consideration of theoretical issues is accompanied by a large number of examples of solving typical problems. At the same time, the authors strictly strove to adhere to the rule so that the tasks under consideration were provided with detailed explanations, which would ensure the independent work of students on subsequent similar tasks.