COMPONENT OPERATION / Swing Device OUTLINE The swing device consists of the valve unit, the swing motor and the swing reduction gear. The valve unit prevents the cavitation and overloads in the swing circuit. The swing motor is a swash plate type axial plunger motor (with built-in swing parking brake), which is driven by pressure oil from the pump and is provided with the swing reduction gear. The swing reduction gear turns the swing motor with large torque at slow speed and swings the upper- structure. Valve Unit Swing Motor Swing Reduction Gear T16J-03-02-001 T3-2-1