Product Overview
Komatsu spring coils are high-tension undercarriage components that maintain precise track tension and absorb severe impact loads during heavy machine operation.
We offer factory-direct supply with full OEM manufacturing services, delivering exact-fit assemblies to replacement part distributors and heavy equipment fleets globally.
Engineered to resist fatigue cracking, our coils eliminate track detracking events and significantly extend the service life of rollers, idlers, and sprockets.
Backed by 20+ years of specialized production and ISO9001/SGS certified quality systems, every batch meets rigorous international inspection standards.
Advanced 55CrSi spring steel and multi-stage heat treatment produce optimal elastic modulus, delivering consistent recoil force through 10,000+ load cycles.
Core Advantages
- 20+ Years Specialized Manufacturing: Accumulated metallurgical expertise ensures repeatable coil geometry and exact spring rates for Komatsu undercarriage systems worldwide.
- Premium 55CrSi Spring Steel: Clean steel chemistry with controlled sulfur/phosphorus limits guarantees superior fatigue strength and resistance to permanent set after overload.
- Deep Quenching & Tempering: Through-hardened to HRC 44-48 core hardness, then shot-peened to induce compressive surface stress that dramatically delays crack initiation.
- ISO9001 & SGS Certified Quality: Every production lot undergoes 100% dimensional inspection, load-deflection testing, and magnaflux crack detection before release.
Our catalog of Komatsu Spring Coil includes various specifications, fully compatible with Komatsu excavators and bulldozers.
Why Choose Dingtai for Komatsu Spring Coils?
Production Technical Parameters
| Parameter | Specification |
|---|---|
| Material | 55CrSi / SAE 9254 high-grade spring steel |
| Core Hardness | HRC 44-48 after quench & temper |
| Manufacturing Process | Hot coiling → quenching → tempering → shot peening → preset → magnaflux inspection |
| Certification | ISO9001, SGS material test report |
| Warranty | 12 months against manufacturing defects |
OEM & Customization
We manufacture directly from your drawings or OEM sample, delivering custom free length, wire diameter, and spring rate within ±3% tolerance band.
Applicable Models
| Machine Type | Compatible Brands | Popular Series / Models |
|---|---|---|
| Excavator | Komatsu | PC200, PC210, PC220, PC300, PC350, PC400, PC450 |
| Bulldozer | Komatsu | D65, D85, D155, D275, D375 |
Delivery & Logistics
Factory-direct pricing with flexible MOQ starting from 10 units. Standard order processes within 25-30 days, shipped via reliable sea freight globally.
Technical Engineering Features
Fatigue-Resistant Design: Optimized coil pitch and closed-ground ends distribute stress uniformly across every active coil, preventing localized yielding even during extreme track recoil.
Shot Peening Technology: High-intensity peening introduces residual compressive stress on the wire surface to a depth of 0.2-0.4mm, effectively stopping microcrack propagation.
Precision Load-Deflection Matching: Each spring is preset to solid height and tested for load at specified compressed length, guaranteeing identical left/right track tension adjustment.
Applications
- Mining and quarry excavation
- Heavy civil construction and earthmoving
- Forestry and land clearing operations
- Demolition and scrap handling
- Pipeline and road construction
Frequently Asked Questions
- What is the minimum order quantity for Komatsu spring coils?
- Standard MOQ is 10 units per specification. Smaller trial orders are accepted with possible surcharge.
- What is the typical delivery time?
- Regular production lead time is 25-30 days after order confirmation and deposit. Express orders can be negotiated.
- How deep is the heat treatment hardening?
- Through-hardening achieves HRC 44-48 at the core, not just the surface. Tempering follows immediately to refine martensite microstructure.
- What warranty do you provide?
- 12-month warranty against material and manufacturing defects under normal operating conditions. Fractures from track over-tension are not covered.
- Can you match a specific Komatsu OEM part number?
- Yes. Provide the OEM part number, free length, and wire diameter, and we will produce an exact fit replacement with full documentation.
- Do you accept sample-based production?
- Absolutely. Send your used sample; our engineers reverse-engineer all critical dimensions and material specs before manufacturing.
- What surface protection is applied?
- Standard coating is black oxide oil finish. Optional anti-corrosion paints or zinc phosphating available upon request.
- How do you ensure consistent spring rate between batches?
- Automated load testing at 100% of units verifies force within ±5% of specification. Statistical process control monitors wire chemistry and heat treat cycles.
Maintenance Guide
- Pre-installation Inspection: Verify free length matches specification and check for shipping damage or corrosion. Reject coils with visible dents.
- Compression Tooling: Always use a hydraulic spring compressor rated for the load. Never pound or wedge a coil into place.
- Tension Adjustment: After installation, adjust track sag to manufacturer’s specification. Over-tensioning shortens coil life dramatically.
- Periodic Wear Check: Inspect coils every 500 operating hours. Measure free height under no load; replace if permanent set exceeds 3% of original free length.
- Crack Detection: During undercarriage rebuilds, perform magnetic particle inspection. Hairline cracks near coil ends indicate fatigue and require immediate replacement.