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Slewing bearings

Slewing bearings

The slewing bearing serves as the pivotal "joint" connecting the excavator's upper structure (boom, cab) to the undercarriage, enabling 360° rotation. It must withstand the weight of the upper structure (up to tens of tons), overturning moments during boom operation, and radial/axial loads generated by digging resistance.

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Performance Requirements
Category Specification
Material Alloy structural steel (e.g., 4140, EN19, 42CrMo4)
Primary Process Quenching and Tempering
Key Properties High tensile strength (≥ 800 MPa), Excellent toughness
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