Dingtai manufactures Yanmar-compatible spring coils for excavator track tensioner assemblies. These heavy-duty coils maintain correct track tension and absorb recoil impact.
We are a factory-direct China manufacturer providing OEM and aftermarket spring coils. We offer custom dimensions, exact material options, and strict tolerance control for global buyers.
High-quality spring steel and controlled heat treatment resist sagging and fatigue cracking. This reduces track derailment risk and prevents unscheduled downtime on demanding jobsites.
With over 20 years of undercarriage parts production, Dingtai holds ISO9001 and SGS certifications. Every batch undergoes hardness and dimensional inspection before shipment.
We use 60Si2Mn spring steel, hot-coil winding, shot peening, and medium-frequency heat treatment. These processes deliver consistent spring force and extended service life.
Core Selling Points
- 20+ Years Experience: We have manufactured excavator undercarriage and spring components for over two decades, supplying replacement parts to distributors across North America, Europe, and Southeast Asia.
- Global Brand Compatibility: Our spring coils are dimensionally matched to Yanmar OEM specifications, ensuring direct fitment across multiple mini excavator model ranges without field modification.
- Deep Quenching/Heat Treatment: Controlled medium-frequency induction heating and oil quenching deliver uniform hardness and microstructure, improving fatigue resistance under cyclic compression loads.
- 100% QC Inspection: Each production batch is tested for hardness, coil free length, and load capacity, with full inspection records retained for traceability and quality assurance.
Our catalog of Yanmar Spring Coil includes various specifications, fully compatible with Yanmar ViO, B, and SV series excavators and compact equipment.
Why Choose Dingtai?
1. Production Technical Parameters
| Parameter | Specification |
|---|---|
| Material | 60Si2Mn / 55CrSi spring steel |
| Hardness | HRC 45–52 after heat treatment |
| Process | Hot coil winding, shot peening, medium-frequency quenching, tempering |
| Surface Treatment | Rust-preventive oil or black paint optional |
| Certification | ISO9001:2015, SGS |
| Warranty | 12 months / 2,000 working hours |
2. OEM & Customization
We manufacture to customer drawings or samples. Custom wire diameter, free length, and coil pitch are available under strict adherence to Yanmar OEM specifications.
3. Applicable Models
| Machine Type | Compatible Brands | Popular Series/Models |
|---|---|---|
| Compact Excavator | Yanmar | ViO17, ViO25, ViO35, ViO50, ViO55, ViO80 |
| Mini Excavator | Yanmar | B17, B22, B27, B37, SV08, SV100 |
4. Delivery & Logistics
We offer factory-direct pricing with flexible MOQ, usually 10–50 pieces per specification. Packing is export-grade, and shipping is by sea, air, or express.
Technical Features
The spring coil operates inside the track tensioner assembly. It absorbs shock loads when the idler hits rocks or debris, protecting the final drive and track frame.
Shot peening introduces compressive stress on the wire surface, delaying fatigue crack initiation. Oil quenching and tempering produce a tempered martensite microstructure with stable load capacity.
Our coil ends are precision ground to ensure flat seating within the tensioner cylinder. This prevents uneven loading and premature spring breakage.
Applications
- Utility and municipal excavation
- Landscaping and trenching
- Road construction and repair
- Demolition and site preparation
- Agricultural drainage and irrigation
Frequently Asked Questions
Q: What is your MOQ for Yanmar spring coils?
A: Standard MOQ is 10 pieces per specification. Mixed models are accepted for initial trial orders.
Q: How long is delivery time?
A: Stock specifications ship within 7 days. Custom production requires 20–30 days depending on quantity and process.
Q: What heat treatment depth do you apply?
A: We heat treat the entire spring wire cross-section, not just the surface. Hardness is controlled to HRC 45–52.
Q: What is your warranty policy?
A: We provide a 12-month warranty against material and manufacturing defects under normal operating conditions.
Q: Can you match my existing part number?
A: Yes. Send your Yanmar OEM part number or drawing. We cross-reference and confirm dimensional matching before production.
Q: Is the spring coil OEM or aftermarket?
A: We manufacture aftermarket replacement spring coils to OEM specifications. We also supply private-label and OEM service programs.
Q: What material do you use?
A: We use 60Si2Mn or 55CrSi spring steel. Equivalent materials are available upon request.
Maintenance Guide
- Inspect track tension regularly. Low tension may indicate spring fatigue or a broken coil.
- When installing, compress the spring safely using a hydraulic press. Never use improvised tools.
- Check spring free length against specification. A reduction over 5% indicates permanent set and replacement.
- Grease the tensioner cylinder bore and spring seats before assembly. This prevents uneven loading.
- Replace springs in pairs if both sides show unequal tension, maintaining balanced track alignment.