The LTZC 5500mm Cross Roller Slewing Bearing Has Passed Acceptance Testing.

In the field of heavy equipment manufacturing, slewing rings serve as critical core components responsible for enabling rotational movement and supporting complex loads. Driven by the rapid advancements in marine engineering, offshore equipment, wind power systems, and large-scale automated machinery, the demands for enhanced precision, load-bearing capacity, and reliability in slewing rings are continuously rising. Among these, the Cross Roller Slewing Bearing has increasingly emerged as a preferred choice for high-end equipment, distinguished by its exceptional load-bearing capabilities and high-precision characteristics.

Recently, a 5,500mm-diameter Cross Roller Slewing Bearing manufactured by LTZC for a European shipbuilding client successfully passed the customer's acceptance testing and has been successfully deployed in marine equipment. This achievement reaffirms LTZC's standing as a specialized manufacturer of slewing rings and a reliable global partner.

I. Differences between Crossed Roller Slewing Bearings and Ordinary Slewing Bearings

1. What is a Slewing Bearing?

A slewing bearing is a large bearing capable of 360-degree rotation and bearing axial, radial, and overturning moment forces during rotation. It typically consists of an inner ring, outer ring, rolling elements, cage, spacers, seals, and a lubrication system. Slewing bearings are usually equipped with an internal or external gear ring that meshes with gears in a drive unit, allowing the drive unit to rotate the bearing. 

Applications of Cross Roller Slewing Bearings:

Construction Machinery

Lifting Equipment

Wind Power Generation

Port Machinery

Marine Equipment

Automation Equipment

Metallurgical Equipment

2. What is a Cross Roller Slewing Bearing?

A cross roller slewing bearing is a special type of slewing bearing with cylindrical rollers arranged in a 90-degree cross pattern. It can simultaneously withstand loads from different directions, and the rollers form a linear contact with the raceway. With a large contact surface, its load-bearing capacity is higher than that of ball bearings.

Applications of Cross Roller Slewing Bearings:

1. Marine Cranes

2. Industrial Robots

3. Radar and Precision Equipment

4. High-End Automation Equipment

III. LTZC 5500mm Cross Roller Slewing Bearing for Marine Equipment

In the field of marine equipment, machinery operates under complex conditions involving the impact of seawater, severe corrosion, and strong winds; this places extremely high demands on the bearings' dimensions, sealing, lubrication, load-bearing capacity, and reliability. As a specialized manufacturer of slewing bearings, LTZC provided a comprehensive solution featuring a 5500mm-diameter cross roller slewing bearing for a major marine equipment manufacturer.

Operating Conditions of Cross-Roller Slewing Bearings

Large-scale marine rotating machinery

Long-duration continuous operation

Corrosive marine environment

High-precision rotation requirements

Traditional ball-type slewing bearings struggled to meet the equipment's specific requirements for rigidity and precision; consequently, the client ultimately opted for a cross roller slewing bearing configuration.

Technical Specifications of the LTZC 5500mm Cross Roller Slewing Bearing

Parameter：Value

Bearing Type：Cross Roller Slewing Bearing

Outer Diameter：5500 mm

Inner Diameter ：5200 mm

Roller Type ：Cylindrical Rollers

Material ：High-Strength Alloy Steel

Gear Type ： External Gearing

Lubrication Method ：Automatic Lubrication System

Sealing Structure ：Double-Layer Sealing

Corrosion Protection ：Marine-Grade Anti-Corrosion Coating

Customization Features of Crossed Roller Slewing Bearings

First, regarding machining precision, the fabrication of such large-scale slewing bearings necessitates the use of large-format CNC equipment, alongside the execution of multiple precision machining stages. LTZC utilized large-scale CNC vertical lathes and high-precision grinding equipment to machine the bearing raceways, thereby ensuring that raceway precision met all design specifications.

Second, concerning roller arrangement, the alignment precision of the crossed rollers directly impacts the operational stability of the bearing. LTZC employed a high-precision spacer block structure and utilized an automated inspection system to verify roller alignment, thereby ensuring that every set of rollers maintained the exact specified crossing angle.

Furthermore, regarding corrosion protection design—as this bearing is intended for use in marine environments—LTZC incorporated specialized corrosion-resistant materials and marine-grade protective coatings. Additionally, the sealing structure was reinforced to effectively prevent seawater ingress into the interior of the bearing.

Product Acceptance Testing

Upon completion of manufacturing, the 5500mm Cross Roller Slewing Bearing underwent rigorous acceptance testing. The test regimen included assessments of rotational precision, load-bearing capacity, noise levels, and sealing performance. Verified through this comprehensive series of tests, the bearing met all design specifications regarding rotational precision, load-bearing capacity, and operational stability, and ultimately successfully passed the client's final acceptance.

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III. How to Install Cross-Roller Slewing Bearings 

Proper installation of a slewing bearing has a significant impact on ensuring the bearing's service life and operational stability. This is particularly true for large cross-roller slewing bearings; if installed improperly, uneven load distribution across the raceways may occur, leading to severe wear and ultimately compromising the bearing's lifespan.

When installing cross-roller slewing bearings, it is essential to strictly adhere to technical specifications and guidelines.

LTZC provides installation instructions for various types of slewing bearings.

Pre-Installation Preparation

Before commencing installation, the mounting surface must first be inspected to ensure that the mounting base possesses sufficient rigidity and machining precision. Simultaneously, the flatness of the mounting surface must be verified to ensure it meets design requirements; typically, for large slewing bearings, the flatness of the mounting surface should be controlled within 0.1 mm. Furthermore, a visual inspection of the bearing itself is required to confirm that its surface is free from defects such as burrs or oil stains.

Bearing Hoisting

Due to the substantial weight of large slewing bearings, specialized hoisting equipment—such as lifting slings or lifting rings—must be utilized during the hoisting process. Direct contact with the raceway surfaces must be avoided to prevent damage to the raceways. Throughout the hoisting process, the bearing should be kept in a level orientation and slowly lowered into its designated mounting position.

Bolt Fastening

Slewing bearings are typically secured using high-strength bolts. During installation, the bolts should be tightened gradually in a diagonal sequence, with the fastening process divided into multiple stages. For instance, the process typically involves an initial positioning stage, followed by tightening to 50% of the specified torque, and finally, completing the fastening at 100% of the specified torque. This method effectively prevents deformation of the bearing.

Gear Mesh Adjustment

For slewing bearings equipped with gearing, the gear mesh condition must be inspected after installation is complete. The gear backlash (tooth side clearance) should be adjusted to ensure the drive system operates smoothly.

Lubrication and Commissioning

Upon completion of the installation, the slewing bearing requires initial lubrication. Additionally, a trial run should be conducted with the equipment operating under a no-load condition to verify that the bearing rotates smoothly.

Contact LTZC for technical support.

IV. LTZC Cross-Roller Slewing Bearing Solutions

As a professional manufacturer of slewing bearings, LTZC not only supplies high-quality slewing bearing products but also provides customers with comprehensive slewing bearing solutions.

Robust Custom Manufacturing Capabilities

LTZC possesses state-of-the-art, large-scale slewing bearing production equipment, enabling us to manufacture a wide range of bearing specifications—including ultra-large diameter bearings, high-precision bearings, and bearings designed for specialized operating conditions—with diameters ranging from 200 mm to 13,000 mm.

Rigorous Quality Control System

Throughout the production process, LTZC subjects every stage to rigorous inspection—including material analysis, heat treatment verification, machining precision checks, and final product testing—thereby ensuring that product quality consistently meets international standards.

Extensive Experience in Industry Applications

LTZC slewing bearings have been widely adopted across diverse sectors—including wind power equipment, port machinery, construction machinery, marine equipment, and automation systems—earning high acclaim and recognition from customers worldwide.