Dingtai manufactures Sumitomo track link assemblies, joining track shoes and transmitting drive force throughout the excavator undercarriage system.
Factory-direct production with comprehensive OEM services supplies replacement link assemblies to global construction, quarry and mining equipment operators.
Forged alloy steel resists wear, elongation and breakage under heavy loads, reducing unplanned downtime and extending total undercarriage service life.
With 20+ years of manufacturing experience and ISO9001/SGS certified processes, Dingtai delivers consistent, traceable quality for demanding applications worldwide.
Premium 35MnB material and deep quenching produce hardened contact surfaces, improving impact toughness and long-term durability in abrasive conditions.
Core Selling Points
- Global Brand Compatibility: Our assemblies match Sumitomo OEM dimensions, ensuring direct replacement without modification across SH, SC, and LS series excavators in demanding applications.
- Premium 35MnB Material: Forged from high-grade 35MnB steel, links resist cracking and elongation under extreme load, abrasive materials, and continuous heavy-duty operation.
- Deep Quenching/Heat Treatment: Induction hardening and tempering achieve ideal HRC depth, maximizing wear resistance while preserving core toughness for prolonged impact service life.
- ISO9001/SGS Certified: Certified manufacturing processes and 100% QC inspection guarantee dimensional accuracy, consistent hardness, and reliable performance in every production batch.
Our catalog of Sumitomo Track Link Assembly includes various specifications, fully compatible with Sumitomo excavators and bulldozers.
Why Choose Dingtai?
1. Production Technical Parameters
| Parameter | Specification |
|---|---|
| Material | 35MnB forged alloy steel |
| Hardness | Surface HRC 50-56 / Core HRC 28-36 |
| Process | Precision forging, CNC machining, induction hardening, tempering |
| Certification | ISO9001:2015, SGS |
| Warranty | 12 months or 2,000 service hours |
2. OEM & Customization
We match original drawings, custom link pitch, bolt hole diameter and heat treatment specifications, strictly adhering to Sumitomo OEM standards.
3. Applicable Models
| Machine Type | Compatible Brands | Popular Series/Models |
|---|---|---|
| Excavator | Sumitomo | SH120, SH200, SH210, SH240, SH300, SH350, SH480 |
| Crawler Crane | Sumitomo | SCX400, SCX500, SCX700, SCX900 |
4. Delivery & Logistics
We provide reliable worldwide shipping from Quanzhou with factory-direct pricing and flexible order quantities, supporting trial orders and bulk procurement.
Technical Features
Precision-machined pin bosses and hardened bushings maintain correct pitch tolerance under high track tension, preventing premature internal wear.
Deep quenching creates a wear-resistant martensitic surface while retaining ductile core toughness, resisting impact fractures in rocky environments.
Sealed lubrication grooves distribute grease across pin and bushing contact faces, reducing friction heat and extending service intervals.
Applications
- Mining
- Road Construction
- Quarrying
- Demolition
- Earthmoving
- Pipeline Construction
Frequently Asked Questions
What is the minimum order quantity?
Minimum order quantity is typically one set for trial orders. Mixed Sumitomo models are accepted, with better pricing for bulk quantities.
What is the delivery time?
Standard production takes 15–30 days depending on order quantity. Stock items can ship within 7 days.
What heat treatment depth do you achieve?
Induction-hardened link surfaces typically achieve HRC 50–56 with case depth of 8–12 mm depending on the specification.
Can you match OEM part numbers?
Yes. Provide the Sumitomo part number or drawing, and we cross-check dimensions against our production database before quotation.
What warranty do you provide?
We offer 12 months or 2,000 service hours warranty against manufacturing defects under normal operating conditions.
Do you support custom link pitch or rail dimensions?
Yes. OEM customization is available for non-standard pitch, bolt hole diameter, and heat treatment specifications.
Maintenance Guide
- Inspect track sag daily and adjust tension to OEM specification to prevent excessive link and rail wear.
- Check pin bosses, link rails and bolt holes for cracks, pitting or elongation before each shift.
- Verify shoe bolt torque after the first 50 service hours and at regular 250-hour intervals.
- Keep undercarriage clear of abrasive rock fines and avoid high-speed reverse travel that accelerates wear.
- Replace link assemblies in pairs when internal pin/bushing wear reaches 20% of original diameter.