Swing Bearing for Kobelco SK210-8 — Internal Gear

The Swing Bearing for 20–30 Ton Kobelco Excavator is a precision-engineered rotary support component designed to replace the original slewing ring on Kobelco mid-size excavators of 20 to 30 ton class. This single-row ball internal slewing bearing ensures smooth 360° rotation of the upper structure, withstands high radial and axial loads, and provides long service life under demanding construction and mining conditions. Manufactured by BRISK SLEWING, this bearing matches Kobelco OEM specifications in dimensions, material grade, and heat treatment, guaranteeing a direct fit with no modification required. It is suitable for both standard duty and heavy-duty applications, including excavation, demolition, and material handling. Our swing bearing reduces maintenance downtime and offers a cost-effective alternative to genuine Kobelco parts without compromising quality or safety.

The swing bearing for Kobelco 20–30 ton mid excavator features the following key technical parameters:

Outer Diameter: 1250 mm; Inner Diameter: 1020 mm; Overall Height: 82 mm;

Gear Type: Internal gear (standard) / External gear (optional); Number of Teeth: 106; Module: 10;

Material: 50Mn or 42CrMo forged steel (quenched and tempered);

Raceway Hardness: HRC 55–62; Gear Surface Hardness: HRC 50–60;

Sealing: Double lip NBR rubber seal, Viton high-temperature seal optional;

Lubrication: M10×1 grease nipple with smooth grease groove;

Precision Class: Grade P5 (ISO 286);

Dynamic Load Rating (axial): 980 kN; Static Load Rating (axial): 2450 kN.

These specifications resist high overturning torque and frequent impact loads from mid-size excavator swing motion. Every unit passes radial clearance, gear backlash and hardness inspection before shipment.

This mid internal gear slewing ring is direct OEM replacement for 20–30 ton Kobelco excavators:

SK200-1, SK200-2, SK200-3, SK200-5, SK200-6, SK200-6 Super, SK200-6E, SK200-8, SK210, SK210-6, SK210-6E, SK210-8, SK230-6, SK250-6, SK250-6E, SK250-8.

Main OEM part numbers: 24100N63471F1, YN40F00019F2, YN40F00026F1.

It can be matched with 20–30 ton CAT, Hitachi, Doosan machines via custom adapter plates; consult our engineering team for cross-reference data.

The bolt pattern uses M24 grade 10.9 bolts with tightening torque of 980 Nm. The installation manual clearly marks the soft annealing zone that must be placed at zero-load idle sector during assembly. Always measure your original bearing OD, ID and height before placing orders.

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.

The mid-size Kobelco excavator swing bearing handles mainstream medium-heavy construction rotary tasks:

Excavation and trenching – high-frequency full-circle swing for road, foundation and pipeline construction;

Demolition and waste recycling – medium shock loads matched with hydraulic breakers;

Forestry log grabbing – steady rotation for timber sorting and loading;

Small quarry rock loading – continuous cycle under dusty abrasive conditions;

Urban infrastructure projects – residential construction, bridge auxiliary excavation.

This mid internal gear bearing series is also widely applied on medium truck cranes and aerial work platforms, supporting both intermittent and long continuous rotation under standard maintenance intervals.

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 20–30Ton Kobelco Swing Bearing → for bolt torque specifications, soft zone placement, and maintenance tips.

Frequently Asked Questions

1. What is the OEM part number for 20–30Ton Kobelco swing bearing?

− SK200-6E OEM No.24100N63471F1; SK200-8 OEM No.YN40F00026F1. Our replacement model SE-1020-35A fully copies OEM dimension, alloy material and heat treatment process for direct installation without modification.

2. Is this slewing ring a direct replacement for 20–30Ton Kobelco excavator?

− Yes, this mid internal gear swing bearing fits all Kobelco 20–30 ton models including SK200, SK210, SK230, SK250 series. Mounting uses M24 grade 10.9 bolts with torque 980 Nm. Verify original bearing overall dimensions before purchase.

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

− 50Mn / 42CrMo quenched & tempered forged steel; raceway HRC 55–62, gear surface HRC 50–60; Grade P5 precision guarantees stable rotation under medium construction loads.

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

− 12-month manufacturing defect warranty; free CAD drawings can be sent within 24 hours after you provide machine model or OEM part number.

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

− Global door-to-door shipment to 60+ countries; sea freight to Southeast Asia, Africa and South America takes 15–25 days; air express service available for urgent orders.