Tower Crane Slewing Bearing | Heavy-Duty Rotation Solutions
🏗️ Product Overview
The Tower Crane Slewing Bearing is the critical "joint" that enables the upper structure of a crane to rotate smoothly relative to the base. As a professional manufacturer, we specialize in producing high-capacity slewing bearings designed specifically for the rigorous demands of tower cranes.
Our tower crane slewing rings are engineered to handle complex load conditions, simultaneously supporting heavy axial forces, radial forces, and tilting moments. By integrating precision gear teeth (internal or external), our bearings ensure precise rotational control and stability, making them the ideal choice for luffing and topkit tower cranes operating in high-rise construction environments.
⚙️ Performance & Quality Highlights
In the demanding world of construction machinery, reliability is non-negotiable. Our manufacturing process focuses on durability and precision.
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Robust Structural Design: We predominantly utilize the Double-Row Ball Slewing Bearing structure for tower cranes. This design features two rows of steel balls with different diameters arranged in an "X" formation. This unique configuration allows the bearing to withstand massive axial loads and tilting moments while maintaining a compact radial size.
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High-Precision Gearing: Whether your application requires an external or internal gear, our gear teeth are precision-cut and induction-hardened. This ensures smooth meshing with the pinion, minimal backlash, and high resistance to wear and tear.
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Superior Sealing System: To prevent the ingress of dust, water, and construction debris, our bearings are equipped with multi-lip rubber seals (often reinforced with steel shims). This extends the service life of the lubricant and the rolling elements significantly.
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Material Integrity: We use high-grade alloy structural steel (such as 50Mn or 42CrMo) for the races, ensuring high toughness and fatigue resistance.
📋 Technical Specifications
While we offer standard models, our engineering team specializes in custom manufacturing based on OEM drawings. Below are typical specifications for our tower crane series.
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Parameter
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Specification Details
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Product Type
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Double-Row Ball Slewing Bearing (02 Series)
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Pitch Diameter
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800mm – 2500mm (Customizable)
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Material
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50Mn, 42CrMo, C45 (Forged Steel)
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Gear Type
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External Gear / Internal Gear / No Gear
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Gear Hardness
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Induction Hardened (HRC 50-55) or Normalized
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Rolling Element
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High-Carbon Chromium Steel Balls (GCr15)
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Sealing
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NBR / Polyurethane / Multi-lip Rubber Seals
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Lubrication
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Grease with Zerk fittings (Standard)
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Mounting
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Through-holes or Tapped holes
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🏆 Certifications & Standards
Quality is the backbone of our manufacturing. Our tower crane slewing bearings are produced in strict accordance with international standards to ensure safety and interoperability.
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ISO 9001:2015: Certified Quality Management System.
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JB/T 2300-2011: The primary Chinese mechanical industry standard for slewing bearings, ensuring rigorous testing of load capacity and dimensional accuracy.
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CE Compliance: Our products meet European safety and health requirements for machinery components.
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SGS Inspection: Third-party testing available for material composition and hardness depth.
🛠️ Services & Support
We understand that downtime in construction is costly. Therefore, we provide more than just a product; we provide a partnership.
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OEM & ODM Capabilities: We can reverse-engineer or manufacture directly from your CAD drawings to replace obsolete bearings from major crane brands (e.g., Potain, Liebherr, Zoomlion).
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Technical Consultation: Our engineers assist in selecting the correct load capacity and gear module to match your crane’s hydraulic or electric drive system.
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Global Logistics: Specialized packaging to prevent corrosion and damage during ocean freight.
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After-Sales Warranty: Comprehensive warranty covering manufacturing defects in materials and workmanship.
🌍 Applications
Our slewing bearings are the core transmission component for various heavy-duty machinery, with a primary focus on:
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Tower Cranes (Topkit & Luffing Jib): Enabling the slewing motion to position loads accurately at great heights.
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Construction Hoists: Supporting vertical transport cabins.
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Concrete Placing Booms: Handling the articulation of concrete pumps.
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Port Cranes: Resisting corrosive environments and heavy cyclic loading.
❓ Frequently Asked Questions
Q: What is the difference between single-row and double-row slewing bearings for tower cranes?
A: For tower cranes, Double-Row Ball Slewing Bearings are generally preferred. Unlike single-row bearings, the double-row design uses two rows of balls with different diameters. This allows them to handle significantly higher tilting moments and axial loads, which are critical when the crane jib is fully extended.
Q: How do I identify the correct replacement slewing bearing?
A: You need to check three main factors: the Mounting Dimensions (bolt hole pattern and spacing), the Gear Data (number of teeth, module, and pressure angle), and the Overall Height. If the old bearing is damaged, we can often identify it based on the crane model.
Q: What kind of grease should be used?
A: We recommend using high-quality lithium-based extreme pressure (EP) grease. The bearing should be lubricated regularly through the grease nipples until fresh grease appears at the seal lips.
Q: Can you manufacture bearings for non-standard cranes?
A: Yes. As a factory, we have extensive experience producing non-standard, large-diameter slewing bearings based on customer samples or blueprints.
