Dingtai manufactures high-performance Caterpillar spring coils designed for track tensioner and recoil mechanism assemblies in heavy excavators and bulldozers.
As a factory-direct manufacturer, we supply complete OEM-standard spring coils to distributors, equipment owners, and aftermarket suppliers across North America and globally.
Our spring coils eliminate premature track sag and derailment, maintaining consistent tension under extreme shock loads, preventing costly downtime and undercarriage component wear.
With 20+ years of specialized manufacturing, Dingtai holds ISO9001 and SGS certifications, ensuring every spring coil meets stringent quality and dimensional accuracy standards.
Forged from 60Si2Mn spring steel with controlled heat treatment, our coils deliver superior fatigue resistance, consistent spring rate, and extended service life in demanding applications.
Core Advantages
- 20+ Years Experience: Two decades of dedicated undercarriage component manufacturing supplying global heavy machinery markets with proven reliability and consistent product quality.
- Premium 60Si2Mn Material: High-grade spring steel with optimal silicon-manganese composition ensures superior tensile strength, excellent elastic limit, and exceptional fatigue resistance under cyclic loading.
- Controlled Heat Treatment: Precision quenching and tempering processes achieve uniform hardness distribution (HRC 42-48), eliminating stress concentration points and extending operational service life significantly.
- 100% QC Inspection: Every spring coil undergoes dimensional verification, load deflection testing, and surface defect inspection before shipment, ensuring full compliance with OEM specifications.
Our catalog of Caterpillar Spring Coils includes various specifications, fully compatible with Caterpillar D3, D4, D5, D6, D7, D8, D9, D10, D11 bulldozers and 320, 330, 336, 345, 349 excavators.
Why Choose Dingtai?
1. Production Technical Parameters
| Parameter | Specification |
|---|---|
| Material | 60Si2Mn Spring Steel |
| Hardness (HRC) | 42-48 |
| Manufacturing Process | Hot Coiling + Quenching + Tempering |
| Surface Treatment | Shot Peening + Anti-rust Coating |
| Certification | ISO9001 / SGS |
| Warranty | 12 Months / 2,000 Hours |
2. OEM & Customization
We manufacture to exact OEM drawings or customer-provided specifications, including custom wire diameter, coil count, and load rating, with strict dimensional tolerance control throughout production.
3. Applicable Models
| Machine Type | Compatible Brands | Popular Series / Models |
|---|---|---|
| Bulldozer | Caterpillar | D3, D4, D5, D6, D7, D8, D9, D10, D11 |
| Excavator | Caterpillar | 320, 325, 330, 336, 345, 349, 374 |
| Track Loader | Caterpillar | 953, 963, 973 |
4. Delivery & Logistics
Flexible MOQ starting from 50 units, factory-direct pricing with reliable sea freight to major US ports. Standard lead time is 25-35 days for production orders.
Technical Features
Our spring coils utilize 60Si2Mn alloy steel with optimized silicon content, enhancing elastic deformation capacity and preventing permanent set even after thousands of compression cycles under maximum load conditions.
Shot peening treatment introduces compressive residual stress on the coil surface, effectively inhibiting crack initiation and propagation, which dramatically improves fatigue life compared to untreated spring surfaces.
Each coil is hot-wound on CNC-controlled mandrels, then undergoes precisely timed quenching and tempering cycles to achieve uniform microstructure, ensuring consistent spring rate across the entire production batch.
Applications
- Heavy Mining Operations
- Large-Scale Earthmoving
- Quarrying and Aggregate
- Road and Highway Construction
- Forestry and Land Clearing
- Pipeline Installation
- Demolition Projects
Frequently Asked Questions
- Q: What is the minimum order quantity for Caterpillar spring coils?
- A: Our standard MOQ is 50 units per specification. Trial orders with smaller quantities are negotiable for new clients evaluating quality.
- Q: How long does delivery take to the United States?
- A: Production lead time is 25-35 days plus 15-25 days ocean freight to major US ports like Houston, Los Angeles, or New York.
- Q: What is the heat treatment depth on your spring coils?
- A: Our through-hardening process achieves uniform hardness of HRC 42-48 across the entire cross-section, not just surface depth, ensuring consistent mechanical properties.
- Q: What warranty do you provide on spring coils?
- A: We offer a 12-month or 2,000-hour warranty covering material defects and manufacturing faults under normal operating conditions.
- Q: Can you match existing Caterpillar OEM part numbers?
- A: Yes, we cross-reference all Caterpillar OEM part numbers. Simply provide your required part number for exact specification matching and quotation.
- Q: Are your spring coils compatible across multiple Cat models?
- A: Some spring coils share cross-compatibility. We confirm exact fitment by part number rather than assuming model interchange.
- Q: Do you provide load test certificates with shipments?
- A: Yes, every batch includes load deflection test reports verifying spring rate, free length, and solid height against specification requirements.
- Q: What packaging do you use for international shipping?
- A: Heavy-duty wooden pallets with anti-rust VCI packaging and reinforced strapping to protect coils during ocean transit.
- Q: Can you customize spring coils for non-standard applications?
- A: Yes, we manufacture custom spring coils to your wire diameter, outer diameter, free length, and load requirements with full engineering support.
- Q: How do you ensure quality consistency across production runs?
- A: We maintain ISO9001 quality management, with incoming material verification, in-process sampling, and 100% final inspection on every coil produced.
Maintenance Guide
- Visual Inspection: Check for surface cracks, corrosion, or coil deformation during routine undercarriage service intervals.
- Load Test: Measure installed spring length under static machine weight; significant sag indicates fatigue and pending replacement.
- Track Tension Monitoring: Improper track tension often signals spring coil fatigue. Replace coils when tension cannot be maintained.
- Replacement Interval: Replace spring coils every 4,000-6,000 operating hours or during major undercarriage overhauls, whichever occurs first.
- Installation: Use proper compression tools during installation. Never use impact methods, which can damage coil integrity and compromise performance.