Gearless Three-Row Roller Slewing Bearing Successfully Assembled | LTZC Bearings

Recently, LTZC successfully completed the precision assembly and quality inspection of its core product—the three-row roller slewing bearing—and achieved batch delivery. As a flagship offering within the high-end slewing bearing category, this product leverages LTZC’s mature R&D and manufacturing system for customized slewing bearings. It effectively addresses key industry challenges such as heavy-duty operating conditions, complex integration requirements, and the need for long-term durability, thereby demonstrating the brand's manufacturing prowess and customization capabilities in the heavy-duty bearing sector.

In high-end, heavy-duty fields—including construction machinery, port hoisting equipment, wind power systems, mining machinery, and large-scale metallurgical equipment—three-row roller slewing bearings serve as critical load-bearing and rotational components. They simultaneously withstand axial loads, radial loads, and overturning moments. Unlike standard slewing bearings, the three-row roller configuration utilizes a design with three independent rows of rollers; this structure delivers superior load-bearing capacity, higher rotational precision, and enhanced fatigue resistance, making it an essential, specialized component for ultra-large, heavy-duty machinery.

I. Core Advantages of LTZC Three-Row Roller Slewing Bearings

LTZC is a specialized manufacturer of heavy-duty slewing bearings with over 30 years of industry experience. Its three-row roller slewing bearings have become the preferred choice for applications involving continuous operation under heavy loads and high-precision requirements. Suitable for heavy-duty equipment such as construction machinery, port cranes, and mining machinery, LTZC delivers tens of thousands of these units annually, marking them as a flagship product resulting from the company's deep expertise in the high-end bearing sector.

First, the three-row roller slewing bearing features a three-dimensional arrangement comprising two rows of axial rollers (top and bottom) and one row of radial rollers (middle). This design allows for the simultaneous and independent handling of massive axial loads, radial loads, and overturning moments, ensuring uniform load distribution. Compared to traditional slewing bearings, its load-bearing capacity is increased by over 30%. It is compatible with ultra-heavy equipment—such as thousand-ton class cranes, large shield tunneling machines, port cranes, and metallurgical converters—making it perfectly suited for extreme heavy-duty operating conditions.

Second, the bearings offer higher precision grades and superior operational stability. LTZC’s mass-produced three-row roller slewing bearings utilize precision forging and CNC finishing processes. Parameters such as raceway roughness, dimensional tolerances, and axial runout are strictly controlled to meet the industry's highest standards, achieving rotation precision levels of P0 or P6. This ensures smooth rotation without sticking or misalignment during equipment operation.

Third, the bearings offer exceptional adaptability and support deep customization services. Large-scale equipment across various industries and operating conditions imposes vastly different requirements regarding dimensions, bore diameters, mounting methods, sealing structures, material hardness, and corrosion resistance. LTZC possesses a mature system for customized R&D and production, enabling the tailoring of three-row roller slewing bearings in terms of diameter, structure, and protection class based on specific equipment parameters, operating environments, and load requirements. These bearings are compatible with both standard models and non-standard specialized equipment, comprehensively meeting the diverse procurement needs of global customers.

II. Standardized Installation Guide for Three-Row Roller Slewing Bearings — LTZC Bearings

2.1 Pre-installation Preparation: Comprehensive Inspection of Environment, Tools, and Bearings

The installation site must be kept clean and free of debris. Prepare and inspect installation tools; all tools must be calibrated beforehand to ensure precision standards are met. Next, re-examine the bearing: after removing the outer packaging, carefully inspect the bearing's appearance to verify it matches the purchased specifications.

3.2 Formal Installation: Step-by-Step Execution with Strict Control of Assembly Precision

Step 1: Precise Positioning. Use specialized lifting equipment to hoist the three-row roller slewing bearing steadily. Maintain a horizontal position throughout the lifting and slow lowering process to avoid tilting, knocking, or impact, thereby preventing bearing deformation or seal damage. Place the bearing steadily onto the mounting base and make fine adjustments to align the bearing's center with the equipment's axis of rotation. Ensure mounting holes align precisely with the base's bolt holes to eliminate any offset or misalignment. Once positioned, manually rotate the bearing slightly to confirm smooth rotation without binding or abnormal resistance.

Step 2: Pre-tightening Mounting Bolts. All mounting bolts must be fitted with the original manufacturer's washers and spring washers. Insert them evenly into the bolt holes and pre-tighten the bolts using a "diagonal cross-pattern, step-by-step" tightening method.

Step 3: Sealing and Clearance Adjustment. After tightening the bolts, focus on inspecting the fit of the bearing seals. Ensure the seal ring sits flush against the bearing end face with no lifting, detachment, or gaps. Use a feeler gauge to measure the bearing's rotational clearance, verifying that the axial and radial clearances comply with factory standards and equipment design requirements.

2.3 Post-installation Acceptance: Test Run and Verification of Installation Quality

Upon completion of installation, the bearing must not be immediately subjected to heavy-load operations. It is mandatory to conduct no-load and light-load test runs for acceptance; formal use may only commence after the installation has been verified as compliant. First, conduct a no-load trial run by manually or mechanically driving the bearing to rotate at low speed while monitoring its operating condition throughout the process; the rotation must be smooth and steady, free from sticking, abnormal noise, or unusual vibration, with no displacement or loosening at the end faces. After 30 minutes of no-load operation, re-check the tightening torque of all bolts using a torque wrench to confirm there is no loosening or torque loss.

Next, proceed with a light-load trial run by operating the bearing continuously at low speed under 30% of its rated load for 1–2 hours, while monitoring temperature, vibration, and noise in real time; the operating temperature should remain at or below 70°C, with no abnormal temperature rise, severe vibration, or harsh, unusual noises. Upon completion of the trial run, inspect the seals, raceway lubrication, and bolt tightness; if all parameters are normal and there is no abnormal wear, the installation is deemed qualified and ready for normal heavy-load operation.

III. LTZC: A Trusted Global Partner for Custom Slewing Bearing Manufacturing

The successful precision assembly and reliable delivery of this three-row roller slewing bearing fully demonstrate LTZC’s comprehensive capabilities in R&D, manufacturing, assembly, and service within the high-end slewing bearing sector. With years of deep expertise in the bearing industry, LTZC focuses on the development and production of high-end, heavy-duty bearings. Our extensive product portfolio—including three-row roller, double-row ball, and single-row roller slewing bearings, as well as custom-engineered solutions—serves a wide range of industries such as construction machinery, port hoisting, wind power, mining, metallurgy, tunnel boring machines (TBMs), and photovoltaic equipment. Our products are exported to numerous countries and regions worldwide, earning high acclaim and long-term trust from international buyers.

Compared to industry peers, LTZC’s core strengths lie not only in superior product quality but also in comprehensive customization services, professional technical support, and all-around after-sales assurance. To meet the diverse needs of global buyers, we offer a one-stop service model covering everything from blueprint design, parameter customization, and prototype production to batch delivery, on-site technical guidance, and the development of operation and maintenance (O&M) plans. To address challenges regarding installation and maintenance faced by overseas clients, we provide standardized English technical manuals, remote technical support, and training sessions. These services help customers quickly master product operation and maintenance techniques, thereby reducing the complexity and cost of equipment upkeep.

Contact LTZC for custom slewing bearings.