Hitachi Excavator 9184497 Swing Bearing ZX120 Slew Ring

The slewing ring (also known as a slewing bearing or turntable bearing) is a critical component in excavators, enabling 360-degree rotation between the upper structure (house) and the undercarriage. It supports axial, radial, and moment loads while ensuring smooth movement for digging, lifting, and material handling operations.

• Facilitates full rotation of the excavator’s upper structure.

• Distributes dynamic and static loads from the boom, arm, and bucket.

• Ensures stability during operation.

• Transmits hydraulic and electrical signals between upper/lower sections (in advanced models)