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LTZC supplies 7000mm slewing bearings for cranes.
Why do large cranes require ultra-reliable slewing bearings?
In modern lifting operations, the functions of cranes are no longer limited to standard construction tasks. Large crawler cranes, offshore cranes, port cranes, and heavy-duty industrial cranes now need to lift heavier loads, operate at higher positions, and maintain precise rotational control under extreme operating conditions.
The core component of these machines is the slewing bearing, also known as the crane slewing ring. This bearing must withstand enormous axial loads, radial loads, and overturning moments while ensuring smooth and precise rotation.
This case study describes how LTZC, a professional bearing supplier and manufacturer, successfully designed, manufactured, and delivered a 7000 mm large-diameter slewing bearing for heavy-duty cranes.
Who is the supplier of crane slewing bearings?
LTZC is a specialized manufacturer focusing on large diameter bearings, slewing bearings, and heavy-duty bearing solutions. With decades of experience in precision machining and bearing engineering, LTZC serves customers across industries including:
Mining and bulk material handling slewing bearing
Port and offshore machinery bearing
Construction and infrastructure equipment
Unlike standard bearing distributors, LTZC operates as a full-process bearing manufacturer, controlling every key step in-house—from raw material selection to final inspection. This integrated capability allows LTZC to deliver customized slewing bearings that meet specific load cases, environmental conditions, and installation requirements.
View LTZC cranes slew ring video
What Were the Requirements for This 7000mm Crane Slew Ring?
The customer in this project was a crane manufacturer developing a large-capacity heavy-duty crane designed for continuous operation under high load cycles. The slewing bearing needed to meet strict performance and reliability targets.
Key application challenges included:
Extremely high axial and overturning moment loads
Large installation diameter with strict geometric tolerances
Continuous rotation and frequent start-stop operations
Outdoor operation with exposure to dust, humidity, and temperature variation
Long service life with minimal maintenance
Given these challenges, the customer required a proven bearing supplier capable of producing large diameter bearings with consistent quality and traceability.
Main Slewing Bearing Specifications
Bearing Type: Single-row four-point contact ball slewing bearing
Application: Heavy-duty crane slewing system
Outer Diameter: ~7000 mm
Inner Diameter: Customized according to crane structure
Rolling Element: High-precision bearing steel balls
Raceway Hardness: 58–62 HRC
Gear Type: External gear (optional internal gear configuration available)
Accuracy Grade:P4
Sealing: Rubber lip seal + labyrinth seal combination
This large diameter bearing was engineered to handle combined loads while maintaining smooth rotation and minimizing wear over long operating cycles.
To get a quote for LTZC crane slewing bearings, contact LTZC today.
Why are slewing bearings so important for cranes?
Supports the entire core load of the crane
The slewing ring needs to simultaneously withstand axial load, radial load, and huge overturning moment within the same structure, supporting the entire upper structure and lifting load of the crane. It is a fundamental component for the crane to achieve heavy-duty rotation.
Determines rotational stability and control accuracy
High-precision slewing bearings provide stable rotational resistance and uniform stress distribution, ensuring smooth rotation and accurate positioning of the crane during lifting operations, improving controllability and operational efficiency.
Affects the overall service life and maintenance costs
The slewing bearing is a critical large component that cannot be frequently replaced, and its reliability directly affects the overall service life of the crane. A long-life design can significantly reduce unplanned downtime and lower maintenance and replacement costs.
Meets the structural requirements of crane-specific operating conditions
Slewing bearings for cranes are typically large-diameter, high-load-bearing, customized structures that can integrate internal or external gears. They are capable of adapting to complex working conditions and long-term heavy-duty operation, and are irreplaceable by ordinary industrial bearings.
What Performance Benefits Did the Customer Achieve?
After installation and commissioning, the crane manufacturer reported several measurable benefits:
Stable rotation under full load conditions
Reduced operating noise and vibration
Improved slewing accuracy during lifting operations
Extended maintenance intervals
High confidence in long-term operational safety
These outcomes reinforced LTZC’s reputation as a trusted bearing supplier for heavy-duty crane applications.
How Does This Project Demonstrate LTZC’s Manufacturing Capability?
This 7000mm slewing bearing project highlights several core strengths of LTZC:
Capability to manufacture ultra-large diameter bearings
Deep expertise in heavy-duty bearing engineering
Full-process in-house production control
A trustworthy bearing supplier, whose bearings are certified with ISO90001, ABS, BV, and other certifications.
Such capabilities are essential when supplying large diameter bearings for critical equipment.
View LTZC's manufacturing capabilities.
Why choose LTZC as your slewing bearing supplier for cranes?
Over 20 years of extensive experience in large slewing bearings
Customized bearing design based on actual load conditions
Reliable delivery capabilities for complex, large, and heavy-duty bearings
LTZC professional engineers provide guidance from bearing design to delivery and installation
LTZC bearing products have been exported to countries such as Germany, Italy, and Canada, making us a trustworthy bearing supplier.
These advantages make LTZC a reliable supplier for demanding crane and lifting applications.
