Study of troubleshooting hydraulic systems, hydrostatic transmissions and hydraulic-assist transmissions. The course deals heavily in the use of test equipment and schematic reading. Emphasis on the operation, control, and repair of the hydrostatic transmission. The control portion emphasizes mechanical, hydraulic-over-hydraulic, and electric-over-hydraulic controls. Torque converter and retarder operation is included within the hydraulic-assist transmission portion. 6 Credits (3 Lecture - 9 Lab) Prerequisite(s): DSM122.