Dingtai manufactures Kobelco spring coils, heavy-duty track tensioner springs that maintain consistent excavator track tension and absorb undercarriage impact loads.
We provide factory-direct sales and complete OEM manufacturing services, supplying replacement spring coils to distributors, dealers, and end users worldwide.
These coils prevent track derailment and premature wear by stabilizing track tension, resisting fatigue breakage, and reducing unplanned downtime.
With over 20 years of heavy machinery component experience and ISO9001/SGS-certified production, Dingtai delivers consistent quality for demanding global applications.
Our spring coils use high-tensile spring steel, precision coiling, and controlled heat treatment to ensure stable spring rate and long fatigue life.
Core Selling Points
- 20+ Years Experience: Over two decades producing undercarriage tension components gives us proven process control and reliable Kobelco spring coil performance.
- Global Brand Compatibility: Our coils match Kobelco OEM dimensions and common aftermarket part numbers, ensuring direct fitment across popular SK-series excavators.
- ISO9001/SGS Certified: Strict quality systems and independent material testing verify hardness, dimensional accuracy, and fatigue resistance on every production batch.
- 100% QC Inspection: Each spring coil is checked for free length, coil pitch, and load performance before shipment to eliminate hidden defects.
Product Range
Our catalog of Kobelco Spring Coil includes various specifications, fully compatible with Kobelco excavators and common OEM part numbers.
Why Choose Dingtai?
Production Technical Parameters
| Parameter | Specification |
|---|---|
| Material | 60Si2Mn / 55CrSi high-tensile spring steel |
| Hardness | HRC 45–52 after heat treatment |
| Load Capacity | Matched to OEM spring rate and track adjuster requirements |
| Processing | CNC coiling, quenching, tempering, shot peening, load testing |
| Certification | ISO9001:2015, SGS |
| Warranty | 12 months or 2,000 working hours |
OEM & Customization
We manufacture from your drawings, samples, or OEM part numbers, matching spring dimensions, coil pitch, and load rate to Kobelco specifications.
Applicable Models
| Machine Type | Compatible Brands | Popular Series/Models |
|---|---|---|
| Hydraulic Excavator | Kobelco | SK200-8, SK210LC-8, SK230-6, SK260LC-8 |
| Heavy Excavator | Kobelco | SK330-8, SK350LC-8, SK380DL |
Delivery & Logistics
Factory-direct pricing and flexible MOQ support both trial and bulk orders, with export-grade packing and reliable sea/air shipping to your port.
Technical Features
The spring coil works inside the hydraulic track adjuster, storing recoil energy and maintaining constant track tension during forward and reverse travel.
Precision coiling and shot peening reduce residual stress, improving fatigue strength under repeated impact loads from rocky or uneven terrain.
Controlled quenching and tempering deliver a uniform HRC range, preventing soft spots, coil collapse, or premature spring settlement in high-hour machines.
Applications
- Mining and quarry overburden removal
- Road and highway construction
- Heavy earthmoving and site preparation
- Demolition and scrap handling
- Forestry and pipeline right-of-way work
Frequently Asked Questions
Q: What is the MOQ for Kobelco spring coils?
A: Standard models usually start at 10 pcs; mixed part numbers are accepted for trial orders.
Q: What is the delivery time?
A: Stock standard coils ship within 7–15 days. Custom production generally requires 20–35 days.
Q: How deep is the heat treatment?
A: Heat treatment is full-section, not surface only. Hardness reaches HRC 45–52 across the coil cross-section after tempering.
Q: What warranty do you provide?
A: We provide 12 months or 2,000 working hours against manufacturing defects under normal operating conditions.
Q: Can I order by Kobelco part number?
A: Yes. Send your OEM part number or drawing; we will verify spring dimensions, coil direction, and load rate before production.
Q: Are these springs compatible with aftermarket track adjusters?
A: Yes, our coils fit original Kobelco track adjuster assemblies and most aftermarket assemblies built to OEM dimensions.
Q: Can you produce custom spring specifications?
A: Yes, we can customize free length, wire diameter, outer diameter, and spring rate according to your sample or drawing.
Maintenance Guide
- Installation: Use a hydraulic spring compressor; never heat or weld the coil. Align the spring squarely in the adjuster housing before releasing tension.
- Inspection: Check spring free length, coil spacing, and surface condition every 500 working hours or during track adjuster service.
- Wear Signs: Replace the spring if free length loss exceeds 5% or visible cracks, corrosion pitting, or permanent coil deformation are present.
- Replacement Interval: Replace left and right springs together during major undercarriage rebuilds to maintain equal track tension and prevent uneven wear.