Abstract The collection contains articles on the prospects for the development of hydraulic drive and hydraulic automation in various branches of engineering, Based on the materials of the III All-Union Conference of Engineering and Technical Workers of Plants , design bureaus and researchers of research institutes and universities . The collection covers the issues of design, improvement of quality and durability of hydraulic actuators of all branches of mechanical engineering. The collection is intended for engineering and technical workers of factories, design bureaus and research institutes of all branches of mechanical engineering . A collection of articles can be useful for performing scientific works on hydraulic drive . Many calculations, graphs, diagrams and models. The book will also be very interesting for people who are practically engaged in hydraulic drives and their manufacture.