Excavator Slewing Bearing Description
YNF16979 slewing bearing is specially designed for construction equipment requiring stable rotation between the upper and lower chassis. With dimensions OD486 x ID314 x H50.5mm and a bolt configuration of 20+22 holes, this bearing (part number 4423-43000-0 / D304 009) fits a wide range of swing systems. Crafted from premium alloy steel and surface-hardened for durability, it resists axial, radial, and tilting moments under demanding job site conditions. This bearing ensures smooth, controlled movement for tasks like lifting, digging, and loading. Ideal for dealers stocking essential excavator slewing parts or repair workshops needing consistent quality.
Browse more excavator slewing bearings at YNF Machinery.
Slewing Bearing Technical/Data Sheet
| Part Number |
4423-43000-0 / D304 009 |
| Outer Diameter (OD) |
486 mm |
| Inner Diameter (ID) |
314 mm |
| Bolt Holes |
20 outer + 22 inner |
| Product Type |
Slew Bearing / Rotary Bearing |
| Application |
Excavator Upper Chassis Rotation |
| Material |
High-Grade Alloy Steel |
| Heat Treatment |
Surface Hardened |
| Category |
Excavator Structural Parts |
| Shipping Method |
Sea, Air, Express |
| Payment Terms |
T/T, Western Union, L/C Available |
Excavator Slewing Bearing Applications
| Application Scenario |
Description |
| Excavator Upper-Chassis Swing |
Supports rotational movement of cabin and boom. |
| Equipment Rebuild & Repair |
Used in maintenance of worn or damaged swing bearings. |
| OEM Parts Supply |
Ideal for parts distributors and service providers. |
| Heavy Equipment Rotation |
Ensures safe, precise 360° rotation in compact or large gearboxes. |
4423-43000-0 Slewing Bearing Detail Display
Related Products
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Swing motor shaft YNF16932 for PC18MR
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Slew gear reducer for Komatsu and Hitachi
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Excavator turntable bearing with 22-hole design
FAQs
-
Q: Is this a direct replacement for D304 009?
A: Yes, it is compatible with D304 009 and 4423-43000-0 specifications.
-
Q: What is the load rating of this bearing?
A: Load ratings are available upon request, based on application type.
Knowledge Base
Slewing bearings are essential for supporting rotational movement in excavators. Their durability and precision affect safety and efficiency. Dual bolt-hole systems offer better load distribution, minimizing wear over time.
