131.50.3150 slewing bearing

131.50.3150 Three-Row Cylindrical Roller Slewing Bearing – Heavy-Duty External Gear Solution for Extra-Large Diameter Applications

The 131.50.3150 Slewing Bearing is made to handle the toughest heavy-duty rotating tasks. This three-row cylindrical roller slewing bearing has an outer diameter of 3432mm, an inner diameter of 2868mm, and a height of 270mm. It also has an external gear. The extra-large diameter slewing ring, which weighs about 5,000 kg, is very stable when handling axial, radial, and tilting moment loads all at the same time. When 42CrMo or 50Mn forged rings are paired with GCr15 cylindrical rollers (50mm diameter), the raceways are precisely inducted hardened to HRC 55–60. This makes sure that they work well for a long time in environments with constant use, like offshore platform cranes, bucket wheel excavators, and tunnel boring machines.

Technical Specifications

Load Capacity & Performance

Through line contact dynamics, three-row cylindrical rollers maximize load capacity. The 131.50.3150 three-row roller slewing bearing distributes forces across three raceway paths, increasing stiffness and minimizing elastic deformation under extreme loads.

Key performance benefits:

· High Axial and Radial Capacity: Perfect for cranes lifting 200+ tons or excavators handling shock loads.

· Excellent Moment Resistance: Resists overturning from large buckets and lengthy booms.

· Continuous Duty Stability: Provides little thermal expansion for 24/7 operation.

· Fatigue Resistance: Optimized roller geometry and heat treatment enhance durability beyond 20,000 hard operation hours.

External Gear Design

The external gear slewing bearing 3150mm incorporates 174 precision-machined teeth on the outer ring, enabling direct mesh with pinion drives. This configuration offers several application benefits:

·  Space Efficiency: Frees up internal diameter for cable routing and hydraulic lines.

· The optimized tooth profile (module 20-24) ensures smooth power transfer at high rotational speeds.

·  Maintenance Access: External gears facilitate inspection and lubrication compared to internal gear arrangements.

· Shock Absorption: HRC 45-50 heat-treated gear teeth offer wear resistance and toughness to avoid brittle fracture under impact loads.

Mounting & Installation

Rated load capacity and service life depend on proper installation. The 2868×3432×270mm slewing bearing has asymmetric mounting holes that need precise alignment.

Directions for installation:

1. Surface Preparation: flat within 0.15mm/m diameter, total flatness ≤ 0.5mm across full diameter, burr-free.

2. Bolt Selection: Use Grade 10.9 or higher bolts torqued to manufacturer specifications.

3. Pre-load Adjustment: Remove play without over-straining the bearing by adjusting axial clearance.

4.Gear Mesh Verification: Check entire tooth width contact pattern and clearance (0.5-1.5mm).

5.Sealing Integrity: Check seal seating to prevent contamination.

On-Site Measurement & Reverse Engineering Services from Luoyang Heng Guan Bearing are available for equipment without technical drawings. Our engineers bring precision instruments to your facility to measure bolt hole patterns, gear modulus, and wear profiles for OEM replacement without factory documentation.

Material & Heat Treatment

Ring Material: Forged 42CrMo and 50Mn steels have a high tensile strength (≥930 MPa) and are very tough to resist shock.

Roller Material: GCr15 bearing steel is very good at resisting rolling contact fatigue and keeping its shape.

How Heat Treatment Works:

· Raceway Induction Hardening: Medium-frequency cooling makes the surface hard (HRC 55–60) with a case depth of 2.5–5 mm, which stops the metal from brinelling and spalling.

· Gear Tooth Hardening: Selective hardening to HRC 45–50 balances core toughness with resistance to wear so that the part can handle sudden loads.

· Stress Relief: Post-quench hardening gets rid of any remaining pressures, which makes sure that the dimensions are correct and the metal doesn't crack.

This two-stage hardening method fixes the problem of raceway spalling in overloaded bearings while keeping the durability of the gear against dust and impact forces.

Applications

The 131.50.3150 slewing bearing excels in industries where failure means catastrophic downtime:

· Offshore Platform Cranes: Resists saltwater corrosion (enhanced by optional zinc-nickel coating) while handling high wind loads.

· Bucket Wheel Excavators: Supports superstructure weight plus digging forces in abrasive mining environments.

· Tunnel Boring Machines (TBM): Maintains precise rotation under immense thrust forces to prevent tunnel misalignment.

· Harbor Cranes: Delivers smooth 360-degree rotation for container handling with minimal rotational play.

· Ladle Turrets: Withstands thermal cycling and molten metal splash in steel mills.

Cross Reference & OEM Replacement

As a product manufacturer China, we provide 1:1 OEM replacements compatible with major European and North American brands. Our reverse engineering service captures worn bearing dimensions to produce drop-in replacements that match original bolt patterns and gear parameters—eliminating costly machine modifications.

Common Cross References: (Note: Verify dimensions before ordering)

· Rothe Erde equivalent models

· IMO series cross-compatibility

Custom Engineering Solutions

Standard models don't always match unique operating conditions. Luoyang Heng Guan Bearing offers comprehensive customization:

· Non-Standard Dimensions: Custom ID/OD ratios for space-constrained installations.

· Special Coatings: Anti-corrosion treatments for marine or chemical processing environments.

· Modified Sealing: Enhanced triple-lip seals for extreme dust or water exposure.

· Load Optimization: FEA-based raceway geometry adjustments for specific load profiles.

· Material Upgrades: High-nitrogen stainless steel for food/pharmaceutical applications.

Our engineering team provides load calculations and application analysis to ensure your customized bearing meets or exceeds performance expectations.

Related Models

Certification

FAQ

Q: How long does the product last?

A: With proper lubrication and maintenance, service life typically exceeds 20,000 hours in continuous-duty applications. Actual lifespan depends on load conditions and operating environment.

Q: Can you replace bearings without original drawings?

A: Yes. Our on-site measurement service captures all critical dimensions through reverse engineering, enabling precise replacements even for obsolete or undocumented equipment.

Q: What delivery time should I expect?

A: In Stock product ships within 7-15 days from stock. Custom setups take 4-6 weeks, depending on intricacy.

Q: How do you prevent seal failure in dusty conditions?

A: We utilize triple-lip sealing systems with labyrinth features and recommend periodic seal inspection and re-lubrication to purge contaminants.

Request a Quote

Selecting the right 131.50.3150 slewing bearing requires understanding your specific load conditions and operating environment. Our engineering team is ready to provide technical consultation, load calculations, and application-specific recommendations. Contact Us at mia@hgb-bearing.com to discuss your requirements, request 3D drawings, or arrange on-site measurement services for your equipment.