Doosan excavator parts DX420 DH420 DH480 0900046 Swing cycle bearing 140109-00007A

Doosan excavator parts DX420 DH420 DH480 0900046 Swing cycle bearing 140109-00007A

The slewing ring operates as a large-scale anti-friction bearing:

1. Rotation Mechanism: The excavator’s hydraulic motor drives a pinion gear that meshes with the slewing ring’s gear teeth, enabling rotation.

2. Load Distribution: Combines axial (vertical), radial (side), and moment (tilting) loads from digging forces.

3. Lubrication: Grease reduces friction between rolling elements and raceways, preventing metal-to-metal contact.

Key Physics:

• Static load capacity: Up to 5,000 kN (for mining excavators).

• Rotational speed: Typically 0–10 RPM.

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