Dingtai manufactures Kobelco-compatible carrier rollers that support the upper track chain and maintain stable alignment in excavator undercarriages.
Factory-direct OEM manufacturing supports US procurement with custom dimensions, private labeling, and replacement part programs for mixed fleets.
Our carrier rollers resist flange wear and seal failure, reducing unscheduled downtime in high-impact digging and grading applications.
With over 20 years of heavy machinery component production and ISO9001/SGS certification, Dingtai supplies traceable, repeatable undercarriage quality.
Roller shells use 35MnB steel and deep quenching to deliver hardened load surfaces that withstand severe abrasion and bending stress.
Core Selling Points
- 20+ Years Experience: Two decades manufacturing undercarriage components for heavy equipment ensures proven dimensional accuracy and consistent batch-to-batch quality.
- Global Brand Compatibility: Carrier rollers are engineered to replace Kobelco OEM part numbers across SK and compact excavator series without mounting modifications.
- Premium 35MnB Material: High-strength 35MnB steel roller shells provide superior impact toughness and bending fatigue resistance compared to standard carbon steel alternatives.
- Deep Quenching/Heat Treatment: Induction hardening creates a deep wear-resistant case, typically HRC 50-55, extending service life in abrasive undercarriage conditions.
Product Range
Our catalog of Kobelco Carrier Roller includes various specifications, fully compatible with Kobelco SK series excavators and crawler cranes.
Why Choose Dingtai?
Production Technical Parameters
| Parameter | Specification |
|---|---|
| Material | 35MnB / 40MnB forged steel |
| Hardness | HRC 50-55 |
| Process | Forged shell, CNC machining, induction quenching, floating seal assembly |
| Certification | ISO9001 / SGS |
| Warranty | 12 months against manufacturing defects |
OEM & Customization
Submit OEM part numbers or drawings. We machine exact mounting dimensions and heat-treat to Kobelco service specifications, ensuring direct bolt-on replacement without rework.
Applicable Models
| Machine Type | Compatible Brands | Popular Series/Models |
|---|---|---|
| 20-35 ton Excavator | Kobelco | SK200-8, SK210LC-8, SK230-6, SK250-8, SK260-9, SK330-6, SK350-9 |
| Compact Excavator | Kobelco | SK55SR, SK75SR, SK135SR |
| Crawler Crane | Kobelco | CKE series |
Delivery & Logistics
Factory-direct pricing with flexible MOQ. Standard parts ship by sea or air within 7-15 days; custom production requires 25-35 days.
Technical Features
Each carrier roller uses a forged 35MnB shell and induction-hardened tread. The deep case depth resists spalling under continuous track tension and shock loads.
A double-cone floating seal keeps oil in and abrasives out. This closed lubrication system reduces internal wear and extends service intervals.
Precision-machined bimetal bushings and hardened shafts control radial clearance, reducing heat buildup and preventing premature shaft seizure.
Applications
- Open-pit mining
- Quarrying
- Heavy civil construction
- Road building
- Demolition and site clearing
- Forestry and land management
Frequently Asked Questions
Q: What is the minimum order quantity for Kobelco carrier rollers?
A: MOQ is typically 1-4 pieces depending on stock. Mixed models and part numbers are accepted.
Q: How long does delivery take?
A: Stock items ship within 7-15 days. Custom-manufactured carrier rollers require 25-35 days after drawing confirmation.
Q: What is the heat treatment depth?
A: Tread hardening depth is 4-8 mm with surface hardness of HRC 50-55, depending on roller diameter.
Q: What warranty do you provide?
A: 12 months from shipment against material and workmanship defects under normal operating conditions.
Q: Can you match Kobelco OEM part numbers?
A: Yes. Provide the OEM number or drawing. We cross-reference dimensions and supply a direct replacement.
Q: Do you offer samples?
A: Yes. Sample orders are available for first-article inspection and field testing.
Maintenance Guide
- Inspect carrier rollers every 500 operating hours for oil leakage, flange wear, and abnormal surface damage.
- Maintain correct track tension. Over-tensioned tracks accelerate tread and bearing wear; under-tensioned tracks increase side loading.
- Check mounting bolts with calibrated torque to prevent loosening and misalignment under vibration.
- Replace rollers when tread wear exceeds OEM limits or when floating seal leakage is visible.