Swing Bearing for Kobelco SK350 — Internal Gear

The Heavy-Duty Swing Bearing for Large Kobelco Excavators is a reinforced heavy-load rotary support component specially developed for Kobelco 30–60 ton large mining and heavy earthmoving excavators. This thickened single-row ball internal slewing bearing delivers ultra-stable full 360° rotation, withstands extreme overturning moment, continuous heavy axial & radial impact loads, and extends service lifespan under harsh open-pit mine, quarry and mass land leveling sites. Manufactured by BRISK SLEWING, this heavy internal gear swing bearing strictly complies with Kobelco heavy-duty OEM standards on forging thickness, alloy composition and deep full quenching heat treatment, supporting direct bolt-on replacement without structural cutting or modification. It is fully adapted to ultra-heavy working conditions such as large rock mining, mass earthmoving, heavy demolition and port bulk cargo stacking. Our heavy swing bearing effectively reduces machine breakdown frequency and provides a budget-friendly substitute for genuine Kobelco heavy spare parts without sacrificing structural strength and operation safety.

The heavy internal gear swing bearing for Kobelco 30–60 ton large excavators adopts reinforced heavy-duty technical parameters:

Outer Diameter: 1620 mm; Inner Diameter: 1310 mm; Overall Height: 102 mm;

Gear Type: Internal gear (standard); Number of Teeth: 124; Module: 12;

Material: Thick-wall forged 42CrMo alloy steel, full quenched & tempered;

Raceway Hardness: HRC 56–63; Gear Surface Hardness: HRC 52–60;

Sealing: Triple lip thickened NBR dust-proof seal, Viton high-temperature resistant seal optional for hot mining working sites;

Lubrication: M12×1 grease nipple with wide deep circulating grease groove;

Precision Class: Grade P5 (ISO 286);

Dynamic Load Rating (axial): 1600 kN; Static Load Rating (axial): 4200 kN.

Thickened raceway and reinforced gear tooth design resist long-cycle heavy swing torque of large excavators. Each heavy slewing bearing passes full load simulation, hardness and gear backlash testing before delivery.

This heavy internal gear slewing ring is direct OEM replacement for Kobelco large excavators over 30 tons:

SK350, SK350-8.

Core OEM part No.: LC40FU0001F1, LC40F00012F1.

The mounting hole uses M30 grade 10.9 super high-strength bolts with tightening torque of 1650 Nm. Our official installation manual clearly labels the soft annealing zone which must be arranged at zero-load idle sector during assembly. We highly recommend measuring your original bearing outer diameter, inner diameter and overall height before ordering to avoid mismatching.

4. Quality Standards & Certification

BRISK SLEWING operates under ISO 9001:2025 quality management system. Each swing bearing undergoes a multi-step quality control process: Raw material verification – chemical composition analysis and ultrasonic testing for internal defects; Forging and heat treatment – controlled quenching & tempering to achieve uniform hardness; Machining – CNC turning and grinding of raceways with surface roughness ≤ Ra 0.8; Gear cutting – hobbing or shaping followed by induction hardening of tooth flanks; Magnetic particle inspection – 100% inspection of raceways and gear teeth for cracks; Dimensional inspection – CMM measurement of all critical dimensions; Noise and rotation test – smoothness verification under load simulation. All test reports and material certificates are kept traceable and can be provided upon request. We also offer third-party inspection by SGS, BV, or TÜV at the buyer's expense.

Kobelco large excavator heavy swing bearing bears ultra-severe heavy rotary loads in harsh industrial environments:

Open-pit mining & stone quarrying – long-hour high-load rock digging and truck loading under abrasive dusty atmosphere;

Large-scale highway & hydropower earthmoving – full-load continuous swing with large-capacity heavy buckets;

Heavy demolition & scrap metal recycling – violent impact from large hydraulic breakers;

Port bulk mineral stacking & loading – uninterrupted 8+ hours daily operation;

Super large foundation and tunnel construction – heavy rock excavation and piling auxiliary tasks.

This heavy internal gear bearing series also matches heavy crawler cranes and industrial heavy-duty turntables. The optimized thick lubrication system extends maintenance intervals for non-stop heavy rotation work.

13+ Years of Experience – We have been manufacturing slewing rings since 2013, specializing in replacement parts for Kobelco, CAT, Doosan, Hitachi, Hyundai and other major brands. Our engineering team understands the unique failure modes of each model.

500+ Technical Drawings – We maintain a library of CAD drawings covering most popular excavator and crane models. You can request a free 2D drawing for verification before ordering.

Global Shipping & Logistics – We ship to over 60 countries via sea, air, or rail. Our logistics partners provide door-to-door delivery with customs clearance support. Average lead time to South America, Africa, and Southeast Asia is 15-25 days.

24-Hour Quick Response – Send us an inquiry with your machine model or OEM number. You will receive a quote within 24 hours, along with technical advice from our engineers.

OEM-Grade Quality at Lower Cost – Our bearings meet or exceed OEM specifications but cost 30-40% less. We offer a 12-month warranty against manufacturing defects.

Customization Available – Non-standard sizes, special seals (e.g. Viton for high temperature), and alternative gear configurations are available. We also accept OEM branding and neutral packaging.

Free Technical Support – We provide installation guides, bolt torque charts, and online remote assistance. For large orders, we can arrange on-site training.

📖 Technical Guide: Read our Installation Guide for Large Kobelco Heavy Swing Bearing → for bolt torque specifications, soft zone placement, and maintenance tips.

Frequently Asked Questions

1. What is the OEM part number for large Kobelco excavator swing bearing?

− SK350-8 OEM slewing part No.LC40FU0001F1. All Kobelco 30–60 ton heavy excavators have exclusive factory serial numbers. Provide your exact machine model, and we will match reinforced SE-series large slewing bearing with identical thick-wall 42CrMo alloy and deep quenching process for direct installation without modification.

2. Is this heavy internal gear slewing ring a direct replacement for Kobelco 30–60Ton large excavators?

− Yes, this heavy swing bearing is tailor-made OEM replacement for Kobelco SK350, SK350-8 large mining excavators. Mounting specification adopts M30 grade 10.9 bolts with tightening torque of 1650 Nm. Always measure original bearing overall dimensions before placing orders.

3. What material and hardness grade are used for this heavy swing bearing?

− Thick-wall forged 42CrMo alloy steel with full quenching & tempering; raceway hardness HRC 56–63, gear tooth hardness HRC 52–60; Grade P5 precision ensures stable rotation under extreme mining heavy loads.

4. What is the warranty period and do you provide technical drawings?

− BRISK SLEWING provides 12-month warranty against all manufacturing defects. Free 2D CAD drawings will be delivered within 24 hours once you submit machine model or OEM part number.

5. How long does shipping take and which countries do you deliver to?

− Worldwide door-to-door delivery via sea, air and rail; standard sea transit to Southeast Asia, Africa and South America lasts 15–25 days; air express service available for time-sensitive orders.