"Hydraulic Symbols" was produced by JI Case to teach the technician/student how to read hydraulic schematics. "Hydraulic Symbols" shows hydraulic circuits illustrated in both line art/engineering drawings and cut-away view drawings. "Hydraulic Symbols" illustrates how symbols are used to represent hydraulic components in hydraulic schematic circuits. Technicians/students will easily see how hydraulic symbols used in circuit schematics greatly simplify the task of visualizing hydraulic circuits. Once visualized, more detailed circuit drawings become easier to understand.