Excavator Komatsu PC70-6 PC78-6 PC60-8 PC70-8 Swing Motor Assembly (Slew Drive) 21W-26-00100 21W-26-00200
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, hydraulically released. Automatically locks upper structure when joystick returns neutral to prevent inertial rotation.
- Valve Block Assembly: Includes overload relief valve, anti-reverse / cushion valve, makeup check valve to absorb impact and avoid rebound at start & stop.
- Output Pinion Gear: Meshes with slewing bearing ring gear for smooth operation.
- Seals & Housing: Includes oil seals, O-rings and durable housing for reliable performance.