We manufacture heavy-duty Doosan spring coils for excavator undercarriage track tensioner assemblies. They absorb recoil forces and maintain stable track tension during operation.
Factory-direct operations support global OEM and aftermarket supply. We provide full customization from drawings, samples, or original part numbers with strict process control.
Worn or cracked springs cause track derailment and uneven pin/bushing wear. Our precision-manufactured coils prevent sudden breakage, reducing expensive unplanned downtime on site.
With over 20 years of undercarriage parts manufacturing experience, Dingtai holds ISO9001 and SGS certifications. Every batch undergoes rigorous quality inspection before dispatch.
Premium spring steel, controlled hot coiling, and precise heat treatment deliver consistent spring rates. Shot peening enhances fatigue life under heavy cyclic loads.
Core Selling Points
- 20+ Years Experience: More than two decades manufacturing undercarriage components ensures proven design, tight tolerances, and stable product quality for Doosan excavators worldwide.
- Deep Quenching/Heat Treatment: Controlled quenching and tempering achieve uniform hardness. This resists permanent set and cracking under high-frequency recoil stress.
- Global Brand Compatibility: Our Doosan spring coils match DX, DH, and Solar series specifications, providing direct replacement for OEM part numbers without field modification.
- ISO9001/SGS Certified: Independent certification verifies our material, process, and dimensional control. We deliver consistent, audit-ready quality for procurement teams.
Product Catalog
Our catalog of Doosan Spring Coil includes various specifications, fully compatible with Doosan DX, DH, and Solar series excavators.
Why Choose Dingtai?
Production Technical Parameters
| Parameter | Specification |
|---|---|
| Material | 60Si2Mn / 55CrSi high-tensile spring steel |
| Hardness | HRC 42–52 after tempering |
| Manufacturing Process | Hot coiling, CNC machining, controlled heat treatment, shot peening |
| Certification | ISO9001:2015, SGS |
| Warranty | 12 months against manufacturing defects |
OEM & Customization
We match OEM drawings, original part numbers, or physical samples. Custom dimensions, spring rate, and surface coating are produced to strict Doosan specifications.
Applicable Models
| Machine Type | Compatible Brands | Popular Series/Models |
|---|---|---|
| Crawler Excavator | Doosan | DX140LC, DX225LC, DX300LC, DH220-5, Solar 220LC-V |
| Crawler Excavator | Doosan | DX340LC, DX420LC, DH300-5, Solar 300LC-V |
Delivery & Logistics
Reliable export packaging and multiple shipping options support factory-direct pricing. Flexible MOQs allow small trial orders and full container loads for scheduled maintenance programs.
Technical Features
High-tensile spring steel is hot-coiled, quenched, and tempered. This controls spring rate and prevents permanent deformation under repeated track recoil loads.
Shot peening introduces residual compressive stress on the coil surface. It greatly improves fatigue strength and delays crack initiation in abrasive working environments.
Precision coil geometry ensures correct preload inside the track tensioner. Stable tension reduces pin-bushing overload and prevents premature undercarriage wear.
Applications
- Mining: Heavy track loads and rock impact require stable tension spring response.
- Road Construction: Long working hours demand consistent undercarriage performance.
- Quarrying: Dust, vibration, and abrasive materials accelerate wear on standard springs.
- Demolition: Shock loads from breaking tasks require high fatigue resistance.
- Infrastructure: Urban excavation and utility projects need reliable component supply.
Frequently Asked Questions
- Q: What is the MOQ for Doosan spring coils?
A: MOQ is usually 2–5 pieces per specification. Mixed models can be combined to reach order requirements. - Q: Can you match my Doosan OEM part number?
A: Yes. Send the OEM part number or drawing. We verify dimensions, spring rate, and fitment before production. - Q: What is the delivery time?
A: Stocked items ship within 7–15 days. Custom production typically requires 25–35 days depending on order quantity. - Q: How deep is the heat treatment?
A: We apply through-section hardening, not surface-only case hardening. Tempering achieves HRC 42–52 across the coil cross-section. - Q: What warranty policy applies?
A: We provide a 12-month warranty against manufacturing defects under normal operating conditions. - Q: What material do you use?
A: We use 60Si2Mn or 55CrSi spring steel, selected for high fatigue strength and impact resistance. - Q: Are sample orders available?
A: Yes. Sample orders are encouraged for first-time buyers to verify fitment and quality before bulk purchasing.
Maintenance Guide
- Inspect Every 500 Hours: Check coil surfaces for cracks, corrosion, or deformation. Early detection prevents sudden track tension failure.
- Check Free Length: Measure free length against the OEM specification. Replace if permanent set exceeds 3 percent of original length.
- Install with Correct Preload: Follow Doosan service manual torque values. Improper preload causes uneven wear and track derailment risk.
- Keep Seats Clean: Remove compacted mud and debris from spring seats. Blocked seats create uneven stress and accelerate coil fatigue.