We manufacture Doosan bulldozer spring coils, precision-engineered recoil springs that maintain track tension and absorb severe undercarriage impact during operation.
Factory-direct manufacturing supports global dealers and equipment fleets with full OEM services, custom dimensions, matched part numbers, and reliable batch traceability.
This component prevents track derailment and unscheduled downtime by resisting fatigue, permanent set, and coil fracture under constant shock loading.
With over 20 years of engineering experience and ISO9001/SGS-certified quality systems, Dingtai delivers repeatable performance and verified material traceability for demanding users.
Premium 35MnB alloy steel, controlled deep quenching, and tempered hardness ensure superior fatigue life and consistent spring force under extreme load cycles.
Core Selling Points
- Premium 35MnB Material: High-strength alloy steel selected for superior hardenability, impact toughness, and resistance to fatigue cracking in heavy undercarriage service.
- Deep Quenching/Heat Treatment: Controlled through-hardening creates uniform microstructure and consistent hardness, preventing soft spots and premature coil sag.
- ISO9001/SGS Certified: Certified production and inspection processes ensure every batch meets dimensional, material, and performance specifications before shipment.
- OEM Capabilities: We match OEM drawings, part numbers, and dimensional tolerances to deliver direct-fit replacement coils for Doosan equipment.
Our catalog of Doosan Bulldozer Spring Coil includes various specifications, fully compatible with Doosan bulldozers and excavators.
Why Choose Dingtai?
1. Production Technical Parameters
| Parameter | Specification |
|---|---|
| Material | 35MnB / 60Si2MnA alloy spring steel |
| Hardness | 42–48 HRC after tempering |
| Process | Hot coiling, deep quenching, tempering, shot peening |
| Certification | ISO9001 / SGS |
| Warranty | 12 months or 2,000 working hours |
2. OEM & Customization
We match customer drawings, OEM part numbers, and required dimensions, producing direct-fit spring coils under strict process control.
3. Applicable Models
| Machine Type | Compatible Brands | Popular Series/Models |
|---|---|---|
| Bulldozer | Doosan | DD80, DD100, DD130 Series |
| Crawler Excavator | Doosan | DX225LC, DX300LC, DX420LC Series |
4. Delivery & Logistics
Factory-direct pricing, flexible MOQ, and reliable export packaging ensure cost-efficient shipping to the US and global destinations.
Technical Features
The spring coil stores and releases kinetic energy from track impacts, isolating the final drive and undercarriage structure from damaging shock loads.
Deep quenching produces a uniform martensitic structure through the coil section, improving fatigue resistance and preventing soft spots that cause sag.
Shot peening after heat treatment introduces compressive stress on the coil surface, delaying crack initiation and extending service life.
Applications
- Mining
- Road Construction
- Quarrying
- Forestry
- Heavy Earthmoving
- Demolition
Frequently Asked Questions
What is the minimum order quantity?
Standard MOQ is 1–5 units for stock specifications; custom OEM orders typically start at 10 units.
What is the typical delivery time?
Stock items ship within 7–15 days; custom production requires 25–35 days depending on order volume.
What heat treatment depth do you achieve?
Deep quenching provides effective hardening depth up to 12–15 mm, ensuring consistent hardness across the coil section.
What is your warranty policy?
We provide a 12-month warranty against material and manufacturing defects under normal operating conditions and correct installation.
Can you match my Doosan part number?
Yes, provide the OEM part number or drawing, and we will verify dimensions and fitment before production confirmation.
Do you support sample orders?
Sample orders are available for evaluation, subject to stock availability and final factory confirmation.
Maintenance Guide
- Check track sag regularly; improper tension overloads the spring coil and accelerates fatigue cracking.
- Inspect for visible coil gaps, permanent deformation, or surface cracks during routine undercarriage service.
- Ensure the recoil spring housing is aligned before installation; misalignment causes uneven loading and premature failure.
- Replace spring coils in pairs or as a complete track tensioner assembly to maintain balanced track tension.
- Apply the correct preload specified by Doosan; over-compression reduces fatigue life and can cause coil fracture.