PC1250-7 PC1250-8 Slewing Bearing Swing Ring for Komatsu
The PC1250-7 slewing bearing is a precision-engineered swing ring designed to support extreme loads, ensure stable upper-structure rotation, and deliver long service life in large Komatsu mining excavators.
| 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.
The Komatsu PC1250-7 operates in some of the most demanding working environments in the industry, including large-scale mining, overburden removal, and heavy earthmoving. At the center of this machine’s movement is the slewing bearing, the critical component that connects the upper structure to the undercarriage while allowing smooth, controlled rotation under enormous loads.
This PC1250-7 slewing bearing is designed specifically to handle the combined axial, radial, and moment loads generated during digging, lifting, and swinging operations. Its performance directly affects machine stability, digging accuracy, and overall operational safety.
Built for High-Load Swing Applications
Unlike standard excavator swing rings, the slewing bearing for the PC1250-7 must withstand continuous high stresses from large buckets, heavy material loads, and long working cycles. The raceways are engineered to distribute these forces evenly across the rolling elements, preventing localized stress concentrations that could lead to premature fatigue or deformation.
This balanced load distribution allows the upper structure to rotate smoothly even when the excavator is operating at maximum capacity, maintaining precise control during material handling and truck loading.
Precision-Machined Raceways and Gear Interface
The internal and external raceways are machined with high accuracy to ensure consistent rolling contact between the bearing and the rolling elements. This minimizes friction, reduces vibration, and helps maintain stable slewing torque over time.
For PC1250-7 machines equipped with an integrated ring gear, the tooth profile is carefully cut to ensure proper engagement with the swing drive, reducing gear noise and extending the service life of both the slewing bearing and the drive pinions.
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.
Materials and Heat Treatment for Long Service Life
The bearing rings are produced from high-strength alloy steel selected for its fatigue resistance and structural stability. Controlled heat treatment improves surface hardness in the raceways while maintaining a tough core that can absorb impact and shock loads.
This combination allows the slewing bearing to resist wear from constant rolling contact while remaining strong enough to handle the dynamic forces created by heavy digging and rapid swing movements.
Sealing System Designed for Harsh Environments
PC1250-7 excavators often work in dusty, abrasive, and sometimes wet conditions. The slewing bearing is equipped with a robust sealing system that keeps grease inside the raceways and blocks out contaminants such as dust, sand, and moisture.
Effective sealing is critical for protecting the rolling elements and raceways from contamination, which is one of the main causes of premature slewing bearing failure in large mining machines.
Stable Rotation and Reduced Structural Stress
A properly designed slewing bearing contributes directly to the stability of the entire upper structure. By maintaining smooth and even rotation, it reduces torsional stress on the frame, boom base, and swing drive components.
This stability improves operator control, especially during precision tasks such as loading trucks or positioning heavy material, while also helping extend the service life of surrounding structural and hydraulic components.
Quality Control and Fitment Accuracy
Each PC1250-7 slewing bearing is produced under strict dimensional and hardness controls to ensure correct fitment on the machine’s swing platform and carbody. Accurate mounting surfaces and bolt hole alignment help achieve proper preload and prevent uneven loading during operation.
This attention to manufacturing accuracy ensures that the bearing performs as intended once installed, without introducing unwanted vibration or misalignment.
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.
