Aftermarket Swing Ring Slewing Bearing for Hitachi Excavator
Precision-engineered slewing bearing designed for Hitachi crawler excavators. Manufactured with forged alloy steel, CNC-machined raceways, and optimized tooth geometry for smooth 360° upper structure rotation. Suitable for models such as ZX200, EX200, ZX240, and more. Includes heat-treated gear teeth and anti-rust packaging for global shipment.
| Material | 50Mn/42CrMo |
|---|---|
| Surface Hardness | HRC58-62 |
Quick Quote Request
Kinton Parts is trusted by professionals worldwide for delivering high-quality parts for excavators, bulldozers, and other construction machinery—with guaranteed performance and durability.
The slewing bearing (also called a swing bearing or turntable ring) is a core structural component that allows the excavator's upper body to rotate over the undercarriage. It supports the machine’s weight while transmitting axial, radial, and tilting forces during digging, lifting, and swinging.
In Hitachi models like ZX200 or EX240, the slewing bearing must withstand thousands of rotation cycles under heavy load. A high-precision swing ring ensures:
- Smooth and controlled cabin rotation
- Efficient power transfer from swing motor to upper body
- Resistance to wear, deformation, and vibration
- Lower noise and improved operating accuracy
Manufacturing Highlights
Our Hitachi slewing bearings are built through a multi-stage process that ensures both strength and precision.
Material & Technical Features
- Material: 42CrMo or 50Mn alloy steel, known for toughness and wear resistance
- Hardness: Raceways and teeth heat-treated to HRC 50–60
- Tooth Type: Internal gear, matched to Hitachi’s swing motor pinion
- Machining Accuracy: ±0.03mm tolerance on raceways and bolt holes
- Seal Options: Standard rubber or reinforced labyrinth seals
- Greasing Ports: Pre-drilled for easy field maintenance
Forged Ring Pre-Machining
The process begins with forged ring steel, polished for flatness and free from cracks. These raw rings form the backbone of the raceway and gear structure.
Gear Cutting on Inner Ring
Next, precision CNC milling equipment is used to machine the internal gear teeth on the inner ring. These teeth are then heat-treated and deburred to ensure long service life and accurate gear engagement with the swing drive.
Final Packing & Storage
Completed swing bearings are cleaned, coated with anti-rust oil, and securely stacked in wooden crates. Each unit is labeled by model and serial number, ensuring ready-to-ship condition for domestic or international delivery.
Fitment Models
This slewing bearing is compatible with a range of Hitachi excavators, including but not limited to:
| BRAND | MACHINERY MODEL NUMBER | |||||||
|---|---|---|---|---|---|---|---|---|
| HITACHI-EX/ZAX/ZX | EX30 | EX40 | EX55 | EX60 | EX60-2 | EX60-3 | EX60-5 | EX70 |
| EX75 | EX100 | EX100-3 | EX100-5 | EX120 | EX120-1 | EX120-3 | EX120-5 | |
| EX130-1 | EX200-1 | EX200-2 | EX200-3 | EX200-5 | EX200LC-1 | EX200LC-2 | EX200LC-3 | |
| EX200LC-5 | EX220-3 | EX220-5 | EX270 | EX270-1 | EX270-2 | EX270-5 | EX270LC-1 | |
| EX270LC-2 | EX270LC-5 | EX300 | EX300-1 | EX300-2 | EX300-3 | EX300-5 | EX300A | |
| EX300LC-1 | EX300LC-2 | EX300LC-3 | EX300LC-5 | EX330 | EX370 | EX400-1 | EX400-2 | |
| EX400-3 | EX400-5 | EX400LC-1 | EX400LC-2 | EX400LC-3 | EX400LC-5 | EX450 | EX450-1 | |
| EX450-2 | EX450-3 | EX450-5 | EX450LC-1 | EX450LC-2 | EX450LC-3 | EX450LC-5 | UH07-7 | |
| ZAX30 | ZAX55 | ZAX200 | ZAX200-2 | ZAX330 | ZAX450-1 | ZAX450-3 | ZAX450-5 | |
| ZX30 | ZX33 | ZX38U | ZX40 | ZX55 | ZX60 | ZX70 | ZX75US | |
| ZX120 | ZX130 | ZX160LC | ZX200 | ZX210 | ZX240 | ZX270 | ZX330 | |
| ZX360 | ZX400 | ZX450 | ZX470 | ZX500 | ZX650 | ZX850 | ZX870 | |
And other crawler excavators.
Not sure about your part number or specs? Just send us the machine model, slewing ring drawing, or old bearing photo—we’ll match the correct unit within 12 hours.
Quality Control & Testing
Every slewing bearing undergoes the following inspection stages before shipment:
- Raceway hardness testing (HRC)
- Gear tooth profile verification
- Bolt hole alignment inspection
- Rotational torque and radial clearance test
- Visual QC for cracks, surface flaws, or burrs
Our process ensures each bearing is field-ready, durable, and low-noise under load.
Why Choose Us
Choosing the right slewing bearing supplier means protecting your excavator’s core performance.
- OEM-Equivalent Forging & Heat Treatment
All slewing bearings are forged from high-grade 42CrMo or 50Mn alloy steel and undergo precision heat treatment. Our raceways and gear teeth meet OEM-level hardness and dimensional tolerance, ensuring durability even in high-cycle or high-load conditions. - Fast Fitment Confirmation & Customization
Just send us your machine model, old bearing photo, or technical drawing, and our team will match the correct unit within 12 hours. We also support custom bore sizes, gear counts, or seal types for special applications. - Rigorous Quality Testing Before Delivery
Every bearing is tested for rotational torque, raceway clearance, bolt-hole accuracy, and gear tooth engagement. We ensure you receive a part that installs smoothly and performs reliably from day one. - Global Shipping & OEM-Labeled Packaging
We serve clients across Asia, Europe, the Americas, and the Middle East. All swing bearings are packed with anti-corrosion protection in strong wooden crates, and we offer custom branding for long-term partners or OEM clients. - Responsive Technical Support
Whether you’re dealing with premature wear, tooth breakage, or clearance loss, our team can assist with on-site failure analysis and replacement advice based on real-world jobsite data.
SHIPPING & DELIVERY
At Kinton Parts, we ensure reliable, worldwide shipping of parts for excavators, bulldozers, and a full range of construction machines—safe, fast, and secure.
All products are securely packed using high-quality export cartons, reinforced wooden cases, or industry-standard palletized packaging to ensure maximum protection during transit and smooth handling during unloading.
Standard orders are typically shipped within 3–5 working days, while large or customized orders are usually dispatched within 7–20 days, depending on volume and production requirements.
We offer flexible global shipping options, including:
- International sea freight for cost-effective bulk transport
- Air freight for urgent orders
- Courier delivery (DHL, FedEx, UPS) for small-volume or sample shipments
Our logistics team manages every shipment carefully, providing real-time updates and tracking information until your order arrives safely at your destination.
Need assistance choosing the best shipping method for your location and timeline? Contact our team — we’ll help you plan a smooth delivery experience.
FAQ
Q: What are your main products?
A: We supply a full range of undercarriage and wear parts for excavators, bulldozers, and other heavy equipment. Our product line includes: Track rollers, carrier rollers, front idlers, sprockets, segments, track shoes, track chains, bolt and nuts, pins and bushings, bucket teeth and adaptors, filters, seal kits, swing bearing, and hydraulic cylinder—plus other essential replacement parts.
Q: Which countries do you export to?
A: Kinton Parts exports to over 60 countries worldwide, including:
USA, Canada, UK, Germany, Russia, UAE, Indonesia, Malaysia, Thailand, India, Pakistan, Bangladesh, Sri Lanka, South Africa, Colombia, Peru, and many others.
Q: Can I order a sample?
A: Yes, we accept trial orders. For parts in stock, samples can be shipped quickly. If you have technical drawings or existing samples, we also support customized production and mold development.
Q: How can I track my order after shipping?
A: Once your order is shipped, we will provide you with all necessary tracking information based on the shipping method. For express deliveries, you’ll receive a tracking number to follow the shipment online. For air or sea freight, we’ll send you the relevant documents such as the airway bill (AWB) or bill of lading (B/L), along with the packing list and commercial invoice to help with tracking and customs clearance.
Quick Quote Request
Trusted by professionals worldwide, Kinton Parts supplies premium-quality components for excavators, bulldozers, and more—with reliable quality you can count on.
