The Hyster C610A represents a unique concept in self-propelled vibratory compactors. A single trunnion mounted high flotation drive-steer tire was the basis for achieving major design objectives of improved traction and maneuverability. Hydrostatics has been employed throughout for transmission of engine power. Required for the new design concept was a rotary hydraulic union with capacity for 50 gpm and 4700 psi. Problems related to the hydrostatic transmission, drive tire, and controls were solved, resulting in a durable and efficient compaction tool.