Product Overview
Quanzhou Dingtai Engineering Machinery Co., Ltd. manufactures Kubota-compatible spring coils that maintain undercarriage track tension and absorb shock loads during operation.
We offer factory-direct supply and complete OEM manufacturing services for global importers, distributors, and heavy equipment maintenance teams.
This spring coil prevents track derailment, vibration damage, and premature undercarriage wear by stabilizing track tension under impact and uneven terrain.
Dingtai brings over 20 years of undercarriage component experience with ISO9001 and SGS certified production, ensuring repeatable quality for critical applications.
Manufactured from quenched and tempered spring steel with shot peening, each coil delivers high fatigue resistance and consistent spring rate in severe duty cycles.
Core Selling Points
- 20+ Years Experience: Since 2003, Dingtai has specialized in undercarriage parts, refining steel selection, heat treatment, and machining for harsh job site and mining conditions.
- Global Brand Compatibility: Our Kubota spring coils are dimensionally matched to OEM specifications, ensuring direct replacement with correct seated height and load rating.
- Precision Forging/Casting: Each spring is coiled from high-grade alloy steel with precision end grinding and load testing to maintain consistent performance under cyclic shock loads.
- ISO9001/SGS Certified: Production batches are controlled under ISO9001:2015 and verified through SGS inspection for hardness, dimensions, and surface finish consistency.
Product Range
Our catalog of Kubota Spring Coil includes various specifications, fully compatible with Kubota excavators and compact track loaders.
Why Choose Dingtai?
Production Technical Parameters
| Parameter | Specification |
|---|---|
| Material | 55CrSi / 60Si2Mn alloy spring steel |
| Hardness | HRC 42-48 after quenching and tempering |
| Process | CNC coiling, heat treatment, shot peening, powder coating |
| Certification | ISO9001:2015, SGS |
| Warranty | 12 months or 2,000 operating hours |
OEM & Customization
Dingtai matches OEM drawings, custom dimensions, and load specifications. We reverse-engineer samples and produce exact-fit springs under strict quality standards.
Applicable Models
| Machine Type | Compatible Brands | Popular Series/Models |
|---|---|---|
| Mini Excavator | Kubota | KX71-3, KX91-3, KX121-3, KX163-5, KX057-4 |
| Compact Excavator | Kubota | U17, U25-3, U35-4, U55-4 |
| Compact Track Loader | Kubota | SVL75-2, SVL90-2 |
Delivery & Logistics
Factory-direct pricing and flexible MOQ support distributor and repair shop orders. Export-grade packaging with reliable sea or air shipping ensures on-time delivery.
Technical Features
The spring coil works with the hydraulic track adjuster to maintain constant track tension, absorb impact energy, and prevent track throw under side loads.
Quenching and tempering produce uniform hardness, while shot peening creates compressive surface stress that resists fatigue cracking and extends service life.
Precision end grinding and load testing ensure stable seated height and spring rate, matching Kubota OEM specifications for reliable replacement.
Applications
- Utility excavation and trenching
- Residential and commercial construction
- Road maintenance and landscaping
- Quarry and aggregate handling
- Demolition and site preparation
Frequently Asked Questions
A: Standard MOQ is 10 pieces. Sample and mixed-model orders are available for first-time buyers.
A: Stocked specifications ship within 7-15 days; custom production typically requires 25-35 days.
A: 55CrSi/60Si2Mn spring steel is quenched and tempered to HRC 42-48, then shot peened.
A: The spring cross-section is through-hardened where specified, with hardness verified by Rockwell testing.
A: Share Kubota OEM part number, machine model, or sample dimensions. Our engineers verify compatibility before production.
A: 12 months or 2,000 operating hours against material and manufacturing defects under normal use.
A: Yes, we adjust wire diameter, free length, and spring rate for heavy-duty or specialized undercarriage applications.
A: Yes, dimensions and load ratings match OEM specifications for direct replacement without modification.
Maintenance Guide
- Inspect track sag regularly; excessive slack indicates coil fatigue or adjuster seal failure.
- Replace spring coil if visible cracks, coil deformation, or reduced free length exceeds OEM limits.
- Grease track adjuster only with recommended grease; over-greasing can overload the spring.
- After installation, cycle track tension and confirm smooth spring return before operating.