Providing a systematic summary of the fundamentals of hydraulic power transmission, this book discusses the main characteristics of hydraulic drives and their most important types in a manner comprehensible even to newcomers to the subject. The subject embraces all current knowledge of the theory and practice of hydraulic power transmission, proceeding from the simple to the more complicated types in its analysis of hydraulic drives. The various hydraulic drive elements are discussed, and they are grouped according to types of drives independently of their construction, with emphasis on their common theoretical basis. Better understanding of the material is promoted by the sample solutions to various mathematical problems given in each chapter, and, in the last chapter, by the sample drafts of hydraulic machines already in operation. The book can be useful in every branch of mechanical engineering in which machines driven by hydraulic power employed. By virtue of its textbook construction, the book is recommended for university students, those attending specialized courses, operators and maintenance crews, and all those with an interest in the workings of hydraulic machinery.