Dingtai manufactures aftermarket carrier rollers for Sumitomo excavators, engineered to support and guide the upper track chain within the undercarriage system.
We operate factory-direct production lines with full OEM manufacturing services, supplying replacement rollers to distributors and equipment fleets worldwide.
Forged and deep-hardened tread surfaces resist premature wear, cracking, and track misalignment that cause costly downtime and undercarriage component failure.
With over 20 years of industry experience and ISO9001/SGS-certified quality systems, Dingtai delivers repeatable precision and verified material traceability.
Each Sumitomo carrier roller uses 35MnB steel and deep quenching technology to achieve high surface hardness and long service life.
Core Selling Points
- 20+ Years Experience: Dingtai has manufactured heavy machinery undercarriage parts for over two decades, serving global OEM and aftermarket customers with proven reliability.
- Premium 35MnB Material: Carrier roller bodies are forged from 35MnB steel for high tensile strength, impact toughness, and resistance to bending under heavy loads.
- Deep Quenching/Heat Treatment: Tread and collar surfaces are high-frequency quenched to HRC 52–58, achieving a hardened depth of 4–8 mm for extended wear life.
- 100% QC Inspection: Every roller undergoes dimensional checks, hardness testing, and leakage testing before shipment, ensuring zero-defect delivery for critical undercarriage applications.
Product Range
Our catalog of Sumitomo Carrier Roller includes various specifications, fully compatible with Sumitomo excavators and bulldozers.
Why Choose Dingtai?
Production Technical Parameters
| Parameter | Specification |
|---|---|
| Raw Material | 35MnB / 40MnB forged steel |
| Tread Hardness | HRC 52–58 |
| Hardened Depth | 4–8 mm |
| Manufacturing Process | Forging, CNC machining, induction quenching, tempering |
| Sealing System | Double-cone floating seal / lifetime lubricated |
| Certification | ISO9001:2015, SGS material report |
| Warranty | 12 months or 2,000 operating hours |
OEM & Customization
We manufacture according to customer drawings or OEM part numbers, customizing dimensions, hardness, and painting to match original Sumitomo specifications.
Applicable Models
| Machine Type | Compatible Brands | Popular Series/Models |
|---|---|---|
| Excavator | Sumitomo | SH120 / SH200 / SH210 / SH240 / SH300 / SH350 |
| Excavator | Sumitomo | SH480 / SH800 / LS2650 / LS2800 |
| Bulldozer / Dozer | Sumitomo | Contact factory with OEM part number for confirmation |
Delivery & Logistics
We offer factory-direct pricing, reliable export packaging, and flexible MOQ suitable for urgent replacement orders and scheduled fleet maintenance programs.
Technical Features
Forged 35MnB shells deliver high impact toughness and resist bending when the upper track chain receives lateral loads.
Induction-hardened treads achieve HRC 52–58 with a 4–8 mm hardened depth, reducing abrasive wear in sandy or rocky conditions.
Double-cone floating seals and lifetime lubrication prevent contaminant ingress and internal wear, extending service intervals before replacement is needed.
Applications
- Mining
- Road Construction
- Quarrying
- Demolition
- Heavy Earthmoving
Frequently Asked Questions
Q: What is the minimum order quantity for Sumitomo carrier rollers?
A: Stock-standard rollers can be ordered from 1–4 pieces. Custom OEM production may require 20–50 pieces depending on specifications.
Q: How long is delivery?
A: Standard rollers ship within 5–15 days. OEM production typically requires 20–30 working days depending on quantity and specifications.
Q: What is the heat treatment depth?
A: Tread surfaces are induction-hardened to 4–8 mm depth with HRC 52–58 hardness, improving wear resistance under abrasive conditions.
Q: What warranty is provided?
A: We offer 12 months or 2,000 working hours from shipment, whichever comes first, covering material and manufacturing defects.
Q: Can you match Sumitomo OEM part numbers?
A: Yes. Provide the original part number or drawing. We confirm cross-reference and supply a direct replacement roller.
Q: Are these genuine Sumitomo parts?
A: No. These are aftermarket replacement parts manufactured by Dingtai to be compatible with Sumitomo machines.
Q: Do you provide samples?
A: Yes. Sample orders are accepted for qualification testing before bulk purchasing.
Q: What certificates do you hold?
A: Our factory is ISO9001:2015 certified. SGS material reports are available for full traceability.
Maintenance Guide
- Inspect roller tread wear every 250 working hours. Replace if tread depth is worn below 25% of original specification.
- Check mounting bolts and bracket torque during routine service to prevent loose roller assembly misalignment and track vibration.
- Look for oil leakage around the seal area. Leakage indicates floating seal damage or excessive internal wear requiring replacement.
- Keep track tension within manufacturer limits to avoid concentrated carrier roller loading and premature failure.
- Do not regrease sealed carrier rollers. The factory-filled lubrication system is designed to last the full service interval.