011.75.3550 Slewing Bearing

011.75.3550 Slewing Bearing – External Gear Crane & Excavator Turntable Solution

Luoyang Heng Guan Bearing Technology specializes in manufacturing the 011.75.3550 Slewing Bearing, a single-row four-point contact ball slewing bearing with external gear (module 20, 191 teeth). This 011.75.3550 slewing ring features 3776mm OD × 3322mm ID × 174mm height, built from 50Mn forged rings with induction-hardened gear teeth delivering 26,900 kN static axial capacity. With over 30 years of precision engineering experience in Luoyang—China's bearing hub—we serve 50+ countries with ISO9001-certified, RoHS-compliant products. Our CNC vertical lathes, quenching machines, and gear hobbing equipment enable diameters from 50mm to 10,000mm at P0-P4 precision grades.

Product Overview

The 011.75.3550 external gear bearing belongs to the 01 series standard type, where the gear teeth are machined onto the outer ring for external pinion engagement. This design represents the most mature slewing drive solution in the crane and excavator industries.

You get an integral 50Mn forged ring with induction-hardened tooth flanks, delivering 26,900 kN static load capacity. The external mounting position of the driving pinion simplifies maintenance access and replacement—a critical advantage during field service of mobile cranes and excavators.

This turntable bearing 3550mm configuration is your go-to choice when you need proven reliability combined with easy serviceability in heavy rotating equipment.

Technical Specifications

Mounting Dimensions

Material & Process

External Gear Data

Why this matters: We provide tangential force data for both quenched-tempered and induction-hardened states—essential for your design validation and pinion sizing. Most competitors omit this critical spec.

Load Capacity

Applications

Truck & Mobile Cranes

External gear drive is the standard configuration for 50–150-ton truck cranes. The external gear slewing bearing 3550mm allows your service technicians to access the pinion from outside, simplifying field maintenance and reducing downtime.

Crawler Cranes

This 3.5-meter diameter single row four point contact ball slewing bearing external gear perfectly matches 80–150-ton crawler crane upper structure slew mechanisms, providing reliable rotation under full-load lifting conditions.

Port Cranes

For portal and gantry cranes, the external gear ring permits larger pitch circles to maximize torque transmission. The gear ring bearing 3550mm accommodates the heavy-duty cycle demands of container handling and bulk material loading.

Large Excavators

The 011.75.3550 serves as the swing bearing in 40–80-ton hydraulic excavators, where external teeth configuration resists the shock loads generated during bucket operations.

Offshore & Marine Cranes

Deck cranes on construction vessels and floating platforms benefit from the corrosion-resistant coating options available on this four point contact slewing ring with external gear, paired with enhanced sealing to prevent saltwater ingress.

Steel Ladle Turrets

In continuous casting lines, this bearing supports rotating ladle transfer stations, enduring high radial loads from molten steel mass while maintaining positional accuracy.

Series Comparison

This table helps you quickly identify whether you need the non-gear 010 series (for external motor drive), the external-gear 011 (for maximum serviceability), or the internal-gear 013 (for compact envelope installations).

OEM & Custom Gear Manufacturing

As a custom gear slewing bearing manufacturer, we offer non-standard modifications including:

· Custom module (m=16, m=18, m=22, etc.)

· Specific tooth counts for unique gear ratios

· Special profile shift coefficients (x) for optimized pinion meshing

· Hard-face welding or nitriding for extreme wear environments

Our engineering team works with your drive unit specifications to ensure perfect gear mesh geometry and clearance control. We provide AGMA/DIN gear accuracy reports and tangential force validation data.

Replacement & Cross Reference

When replacing the 011.75.3550 slewing bearing in your equipment, verify these critical dimensions:

· D₁ (Outer bolt circle): 3686 mm

· D₂ (Inner bolt circle): 3414 mm

· H (Height): 174 mm

· Module m: 20

· Teeth Z: 191

This model is designed for interchangeability with equivalent products from EIM, LYHY, Wanda, and other manufacturers adhering to JB/T 2300-2011 standard. We can perform on-site measurement and reverse engineering if you lack original drawings—our field engineers map old components and produce drop-in replacements optimized for your actual operating conditions.

FAQ

Q: What is the delivery time for the product?

A: Standard lead time is 4–6 weeks for single units. Rush orders can be accommodated based on current production schedule.

Q: Can you provide CAD drawings for installation design?

A: Yes. Upon order confirmation, we supply 2D installation drawings (DWG/PDF) and 3D models (STEP/IGES) for integration into your equipment assembly.

Q: How do you ensure gear accuracy for external pinion meshing?

A: Our CNC gear hobbing and shaping machines hold DIN Grade 8 accuracy. Each gear is inspected for pitch error, profile deviation, and runout before hardening.

Q: What coating options are available for corrosive environments?

A: We offer zinc-nickel plating, epoxy coating, and specialized anti-corrosion paints suitable for marine and offshore applications.

Q: Do you support small-batch or prototype orders?

A: Absolutely. As a slewing ring supplier Luoyang factory, we accept orders from single prototypes to bulk production runs.

Q: What if my bearing has non-standard dimensions or special requirements?

A: Our team provides full custom design services, including load calculation, finite element analysis, and material optimization for your specific duty cycle.

Contact Us

Ready to specify the 011.75.3550 Slewing Bearing for your crane, excavator, or rotating platform?

Email: mia@hgb-bearing.com