Swing Bearing for Hitachi ZX200-6(α=270)/ZX210-6 — Internal Gear

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

The swing bearing for Hitachi 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 moments and frequent impact loads from mid-size excavator swing. Each unit undergoes full inspection of radial clearance, gear backlash and raceway hardness before shipment.

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

EX200, EX200-1, EX200-2, EX200-3, EX200-5, EX230, EX300-3, ZX200, ZX200-3, ZX200-6, ZX200-6α, ZX210-6, ZX230, ZX240, ZX240-3, ZX270, ZX280.

Classic matching OEM part No.9196732 (ZX200), 9154037 (ZX230/240). Additionally, it can fit 20–30 ton CAT, Doosan, Komatsu excavators with custom adapter plates, consult our engineer for cross reference.

The bolt pattern uses M24 grade 10.9 bolts with tightening torque of 980 Nm. Our installation manual clearly marks the soft annealing zone which must be placed on zero-load idle sector during assembly. Always measure your original bearing dimensions before ordering.

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 Hitachi excavator swing bearing undertakes mainstream medium-duty construction rotary work:

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

Demolition and recycling – medium impact loads matched with hydraulic breakers;

Forestry and log handling – stable rotation for log grapple sorting;

Small quarry loading – dust-resistant continuous cycle operation;

Municipal infrastructure – pipeline, bridge and residential foundation projects.

This mid internal gear bearing series is also widely used in medium truck cranes and aerial work platforms, supporting intermittent and long-time continuous rotation under standard maintenance cycles.

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

Frequently Asked Questions

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

− Hitachi ZX200 series OEM slewing No.9196732; ZX230/ZX240 series OEM No.9154037; EX200 series has exclusive factory codes. Our replacement model SE-1020-35A fully matches original dimension, material and heat treatment for direct bolt-on installation without modification.

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

− Yes, the BRISK SLEWING mid internal gear swing bearing is designed as direct OEM replacement for all Hitachi 20–30 ton diggers including EX200/230, ZX200/230/240/270/280 series. The bolt pattern uses M24 grade 10.9 bolts with tightening torque of 980 Nm. Always verify your original bearing OD, ID and height before purchase.

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 medium-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.