Swing Bearing for Doosan DH200-3 — Internal Gear

The Swing Bearing for 20–30 Ton Doosan Excavator is a precision-engineered rotary support component designed to replace the original slewing ring on Doosan 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 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 Doosan parts without compromising quality or safety.

The swing bearing for Doosan 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 (internal); 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 rubber seal (NBR standard, Viton for high temperature);

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

Precision Class: Grade P5 (ISO 286); Dynamic Load Rating (axial): 980 kN; Static Load Rating (axial): 2450 kN.

These specifications ensure the bearing withstands the high overturning moments and shock loads typical of mid-size excavator swing motions. Each unit is 100% tested for radial clearance, gear backlash, and raceway hardness before shipment.

This mid internal gear slewing ring is designed as a direct replacement for 20–30 ton Doosan excavators:

DH220, DH220-3, DH220-5, DH220-7, DH220LC-7, DH250, DH250LC, DH258, DH280, DH300, DX220, DX220LC, DX225, DX230, DX250, DX250LC, DX260, DX260LC, DX300, S220, S225, S250, S280, S300.

Additionally, it may fit other 20–30 ton class excavators from Komatsu, Hitachi, Volvo with adaptor plates – please consult our engineering team for cross reference. The bolt pattern uses M24 grade 10.9 bolts with a tightening torque of 980 Nm. We provide an installation manual that includes the correct soft zone placement (the annealed zone must be positioned at the zero-load idle sector). Always measure the existing bearing dimensions before ordering to confirm compatibility.

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 Doosan excavator swing bearing is essential for heavy rotary movement on 20–30 ton diggers. Typical applications include:

Excavation and trenching – continuous 360° swinging with high cycle frequency;

Demolition and recycling – heavy shock loads from hammer attachments;

Forestry and material handling – log grapples and sorting grabs;

Mining and quarrying – loading trucks in dusty and abrasive environments;

Infrastructure construction – road building, foundation work, pipe laying.

Beyond excavators, the same bearing series is used in medium truck cranes, aerial work platforms, and industrial turntables. Our design supports both intermittent and continuous rotation, with lubrication intervals matched to standard maintenance schedules.

13+ Years of Experience – We have been manufacturing slewing rings since 2013, specializing in replacement parts for Doosan, CAT, Komatsu, Hitachi, 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 Doosan Swing Bearing → for bolt torque specifications, soft zone placement, and maintenance tips.

Frequently Asked Questions

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

− Classic model DH220 OEM part number is K1000008E. Our matching replacement model SE-1020-35A fully matches original Doosan specifications in dimensions, material grade, and heat treatment, ensuring a direct bolt-on fit with no modifications required. Other Doosan mid excavator models have independent OEM codes, send your machine model for matching.

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

− Yes, the BRISK SLEWING mid internal gear swing bearing is designed as a direct OEM replacement for all Doosan 20–30 ton excavators including DH220 series, DH300, DX220 series, DX300, S220 etc. The bolt pattern uses M24 grade 10.9 bolts with a tightening torque of 980 Nm. Always verify your existing bearing dimensions before ordering.

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

− The slewing ring is manufactured from high-quality 50Mn or 42CrMo forged steel, quenched and tempered to achieve a raceway hardness of HRC 55–62 and gear surface hardness of HRC 50–60. The precision class is Grade P5 (ISO 286), ensuring smooth rotation and long service life under heavy excavator loads.

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

− BRISK SLEWING offers a 12-month warranty against manufacturing defects on all swing bearings. Yes, we maintain a library of 500+ CAD drawings covering most excavator and crane models. You can request a free 2D drawing for verification before ordering. Simply send us your machine model or OEM number, and our engineering team will provide the drawing within 24 hours.

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

− We ship to over 60 countries worldwide 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. For urgent orders, express air shipping is available. Contact our sales team for a precise delivery quote based on your location.