Excavators Parts Slewing Bearing Ring Circle for Komatsu
Premium slewing bearing designed for Komatsu excavators including PC200, PC220, PC300, and PC400 series. Forged from 42CrMo alloy steel, CNC-machined gear teeth, and heat-treated raceways ensure stable upper carriage rotation under high-load cycles. Perfectly suited for digging, swinging, and demolition applications in mining and construction.
| Material | 50Mn/42CrMo |
|---|---|
| Surface Hardness | HRC58-62 |
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Kinton Parts is trusted by professionals worldwide for delivering high-quality parts for excavators, bulldozers, and other construction machinery—with guaranteed performance and durability.
In Komatsu excavators, the slewing bearing is the structural core of the machine’s rotation system. It connects the upper body—including cabin, boom, and arm—to the lower undercarriage, enabling 360° rotation under load.
From trenching in confined urban spaces to loading heavy materials on quarry sites, Komatsu machines like the PC200 or PC300 demand a swing bearing that can:
- Transmit combined axial and radial forces during bucket movement
- Absorb tilting moments during offset digging
- Maintain precise alignment between the swing motor and slewing ring
A failing slewing bearing can cause noisy rotation, backlash, or dangerous misalignment—compromising safety and performance.
Slewing Bearing Production Process
Our slewing bearings are built through a multi-stage process that ensures both strength and precision.
Product Features & Technical Details
- Material: 42CrMo / 50Mn high-strength forged alloy
- Gear Type: Internal gear hardened & profile-verified
- Raceway Hardness: HRC 50–60 for durability
- Machining Tolerance: ±0.03mm for bolt holes and runout
- Seal Options: Double-lip or labyrinth-style to prevent mud, water, or dust ingress
- Lubrication: Grease nipple ports pre-installed
- Performance Testing: Noise level, rotation torque, and backlash all tested before shipment
Forged Ring Pre-Machining
Our process begins with high-quality alloy steel rings (typically 42CrMo), forged and polished for flatness and crack-free integrity. These rings form the structural base of both inner and outer components.
Gear Cutting on Inner Ring
The inner ring undergoes CNC gear milling to create a tooth profile that precisely matches Volvo swing pinions. After cutting, teeth are quenched and tempered to resist wear and deformation during high-load engagement.
Final Packing & Storage
After inspection, the slewing bearings are coated with anti-rust oil, wrapped in plastic, and packed in strong wooden crates. Labels include model code, part number, and batch information for easy identification and shipping control.
Komatsu Model Compatibility
We have slewing bearings that can match the following models.
| BRAND | MACHINERY MODEL NUMBER | |||||||
|---|---|---|---|---|---|---|---|---|
| KOMATSU-PC | PC20 | PC30-5 | PC30-6 | PC30-7 | PC30-8 | PC35 | PC40 | PC45 |
| PC50 | PC55 | PC40-5 | PC40-6 | PC40-7 | PC50 | PC55 | PC60-1 | |
| PC60-3 | PC60-5 | PC60-6 | PC60-7 | PC75 | PC100-1 | PC100-3 | PC100-5 | |
| PC100-6 | PC100-7 | PC120-3 | PC120-5 | PC120-6 | PC120-7 | PC150 | PC200-1 | |
| PC200-3 | PC200-5 | PC200-6 | PC200-7 | PC200-8 | PC220-1 | PC220-3 | PC220-5 | |
| PC220-6 | PC220-7 | PC220-8 | PC200LC-3 | PC200LC-5 | PC200LC-6 | PC200LC-7 | PC200LC-8 | |
| PC240 | PC300-1 | PC300-5 | PC300-6 | PC300-7 | PC300LC | PC300LC-5 | PC300LC-6 | |
| PC300LC-7 | PC360-5 | PC360-6 | PC360-7 | PC360LC-5 | PC360LC-6 | PC360LC-7 | PC360LC-8 | |
| PC400-1 | PC400-3 | PC400-5 | PC400-6 | PC400-7 | PC400LC-1 | PC400LC-3 | PC400LC-5 | |
| PC400LC-6 | PC400LC-7 | PC450-5 | PC450-6 | PC450-7 | PC450LC-5 | PC450LC-6 | PC450LC-7 | |
| PC650 | PC750 | PC800 | PC350 | |||||
Not sure if this bearing fits your machine? Just send us your serial number, part drawing, or old bearing photo, and our technical team will confirm compatibility within 12 hours.
Inspection & Quality Control
Each Komatsu slewing bearing goes through a strict QA workflow:
- Tooth profile check using digital gauges
- Raceway smoothness and hardness testing
- Bolt hole precision for easy assembly
- Full rotation simulation under load to detect vibration or backlash
- Visual & dimensional QC before oil-sealing and packing
We guarantee every bearing meets or exceeds OEM performance benchmarks.
Packaging & Delivery
Export-ready and safe for long-haul shipping:
- Anti-rust surface treatment for long storage
- Plastic wrap + moisture-proof liner inside every crate
- Stackable wooden crates labeled with batch number and model code
- Optional custom branding or neutral packaging available
We support global distribution and FCL/LCL shipment.
Why Choose Us
We specialize in precision undercarriage and rotary systems for global excavator fleets. For your excavator slewing bearing needs, we offer:
- OEM-standard forging and gear processing using high-grade alloy steel
- Fast fitment confirmation—simply send us your Doosan model or dimensions
- Global shipping & inventory support, with strong packaging and tracking
- On-site support and technical advice for swing bearing wear or failure
- Flexible MOQ, allowing you to order one unit or full container loads
When it comes to long-lasting swing performance, we help you turn with confidence.
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.
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Trusted by professionals worldwide, Kinton Parts supplies premium-quality components for excavators, bulldozers, and more—with reliable quality you can count on.
