SK30SR Track Bottom Lower Roller for Kobelco mini Excavator
The Kobelco SK30SR track roller is a heavy-duty bottom roller designed to deliver stable track support and reliable performance for mini excavators. Manufactured with high-strength steel, advanced heat treatment, and precision machining, this track roller ensures long service life, reduced wear, and excellent adaptability in tough working environments.
| Material | 50Mn/40MnB |
|---|---|
| Surface Hardness | HRC53-58,deepth: 8-12mm |
| Colors | Black or yellow or customized |
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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 track roller, also known as the bottom roller, plays a vital role in the Kobelco SK30SR mini excavator undercarriage system. It supports the machine’s weight, maintains track alignment, and provides stable ground contact while the excavator operates on various terrains. High-quality rollers reduce vibration, improve operational stability, and prevent premature wear on the track chain, ensuring smoother and safer operation.
Material and Heat Treatment
This track roller is manufactured using premium-grade alloy steel, specifically selected for durability and resistance to impact. Each roller undergoes a controlled heat treatment process to harden the surface while maintaining a tough inner core. The final hardness reaches HRC 52–58, which effectively resists surface wear, deformation, and cracking even under heavy loads or abrasive conditions.
Manufacturing Process
Every Kobelco SK30SR track roller goes through a strict and standardized production process:
Heat Treatment
The track roller undergoes a controlled heat treatment process to enhance the hardness and toughness of the steel. This step ensures that the roller surface achieves the ideal balance between wear resistance and impact strength. With precise temperature control and quenching methods, the roller achieves a hardness of HRC 52–58, allowing it to withstand harsh working conditions such as rocky terrain and heavy excavation tasks.
Machining Process
After heat treatment, the roller body enters the precision machining stage. Using CNC lathes and grinding equipment, each roller is processed to meet exact dimensional tolerances. This guarantees a perfect fit with the shaft and sealing components. Machining also ensures smooth surface finishes, which reduce friction during operation and contribute to longer service life.
Assembly
During assembly, the roller shell, shaft, bushings, and seals are carefully fitted together. The use of high-quality seals prevents oil leakage and protects the roller from dust, mud, and water intrusion. Strict assembly procedures ensure that each component works harmoniously, resulting in a roller that operates smoothly and consistently in tough working environments.
Running Test
Before leaving the production line, each track roller undergoes a dynamic running test. This test simulates real working conditions by rotating the roller under load, checking for abnormal noise, resistance, or vibration. It ensures the roller is well-lubricated, properly sealed, and capable of delivering reliable performance once installed on the excavator.
Paint Spraying
Once the mechanical testing is complete, the roller is coated with anti-rust primer and durable paint. This not only gives the roller a clean and professional finish but also protects it against corrosion and harsh weather exposure. The paint coating extends the service life of the roller, especially in humid or muddy working environments.
Packing
The final step is secure packing to ensure safe transportation. Rollers are individually wrapped or palletized in wooden crates, with protective layers to prevent scratches or rust during long-distance shipping. Each package is clearly labeled with product information, making it easier for customers to identify and install the correct part.
Quality Control and Inspection
Strict quality checks are conducted at each stage of production. Dimensional accuracy, surface hardness, sealing integrity, and rolling smoothness are inspected before delivery. Only rollers that meet or exceed OEM standards are approved for shipment.
Compatibility & OEM Fitment
The Kobelco SK30SR track roller is engineered to match OEM specifications, making it fully compatible with your machine’s undercarriage system.
- Excavator Model: Kobelco SK30SR
- Roller Type: Single Flange Bottom Roller
OEM Replacement Support: Available upon request (part numbers can be confirmed with casting codes or customer-provided references).
| BRAND | MACHINERY MODEL NUMBER | |||||||
|---|---|---|---|---|---|---|---|---|
| KOBELCO | SK30 | SK35 | SK40 | SK45 | SK55 | SK60 | SK60-8 | SK60-10 |
| SK75 | SK100 | SK120 | SK120-5 | SK120-6 | SK130 | SK135 | SK135SR | |
| SK135SR-2 | SK140 | SK140SR | SK200 | SK200-3 | SK200-5 | SK200-6 | SK200-8 | |
| SK200-10 | SK210 | SK210-8 | SK210LC | SK220 | SK230 | SK230LC | SK250 | |
| SK250-8 | SK260 | SK260LC | SK270 | SK300 | SK300-6 | SK300-8 | SK320 | |
| SK330 | SK330-6 | SK350 | SK350-8 | SK350LC | SK380 | SK400 | SK450 | |
| SK480 | SK480-8 | SK485 | SK500 | SK500LC | SK850 | SK850LC | ||
Application Scenarios
The SK30SR track roller is designed to withstand demanding conditions such as:
- Construction sites with uneven terrain
- Roadwork and compact excavation projects
- Landscaping and utility maintenance
- Harsh environments with mud, sand, or gravel
With excellent sealing performance, it prevents dirt and moisture from entering the roller body, ensuring reliable performance across all work conditions.
Maintenance Tips
To extend service life, operators should:
- Regularly check for unusual noise or vibration during operation.
- Ensure proper track tension to avoid excessive load on rollers.
- Inspect seals for leaks and replace if damaged.
- Clean debris and mud buildup around rollers to prevent wear.
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.
