Swing Motor Assembly 21K-26-71100 for Komatsu Excavator Models Compatible with Komatsu excavator models PC160LC-7, PC160LC-8, PC190LC-8, PC180LC-7K, and PC195LC-8. Key Components & Features Swing Hydraulic Motor Fixed axial piston motor including cylinder barrel, piston, shoe and valve plate to generate rotary power. Planetary Gear Reducer Multi-stage planetary gear set reduces speed and amplifies torque to drive slewing ring. Built-in Wet Swing Brake Spring applied,