Heavy-duty rotation solenoid valve 20Y-60-22121 for Komatsu PC200-6 and PC400-6 large hydraulic excavators with the 6D95 series diesel engine. This high-capacity solenoid manages hydraulic flow to the swing motor for controlled and safe body rotation. Built for elevated system pressures and demanding large excavator duty cycles. Features reinforced coil winding, high-pressure-rated seals, and vibration-dampening mounting. Direct OEM replacement. Compatible with PC200-6 and PC400-6 — verify serial number range. Restores smooth, precise swing rotation.