Success story of the textbook "Hydraulic drive. Fundamentals and Components, "familiar to many under the German title Der Hydraulik Trainer, began with the first edition of this book in 1978. Since then, she has accompanied many generations of engineers as a tutorial, self-taught, handbook and is still an indispensable assistant in the workplace. The basis for success was the concept laid down by the very first authors: to explain the foundations and functioning of hydraulic devices in section, indicating the schematic diagrams. Thus, the theory was closely related to practice.