Dingtai manufactures heavy-duty spring coils for John Deere bulldozer track recoil systems, absorbing impact and maintaining proper track tension during operation.
Factory-direct production supports global OEM and aftermarket clients with custom dimensions, material selection, and private labeling for replacement undercarriage components.
Engineered to resist fatigue cracking and permanent set, these coils prevent track derailment, idler failure, and unplanned downtime in high-impact conditions.
With over 20 years of heavy equipment component manufacturing, Dingtai maintains ISO9001 and SGS certified processes for consistent metallurgical quality.
We use 60Si2MnA alloy steel, CNC hot coiling, controlled quenching, and shot peening to deliver high fatigue strength and long service life.
Core Selling Points
- Global Brand Compatibility: Direct replacement geometry for John Deere 450G, 550G, 650G, 700H, 750J, and 850J dozer recoil spring assemblies.
- Deep Quenching/Heat Treatment: Controlled quenching and tempering achieve HRC 45–52 through the wire section, preserving elasticity and preventing permanent set under load.
- ISO9001/SGS Certified: Certified production with full material traceability, dimensional reports, and third-party inspection availability for every export batch.
- 100% QC Inspection: Each coil passes load deflection testing, hardness verification, magnetic particle crack detection, and surface quality checks before packaging.
Our catalog of John Deere Bulldozer Spring Coil includes various specifications, fully compatible with John Deere 450, 550, 650, 700, 750, and 850 series bulldozers.
Why Choose Dingtai?
Production Technical Parameters
| Parameter | Specification |
|---|---|
| Material | 60Si2MnA / 55CrSiA alloy spring steel |
| Hardness | HRC 45–52 after quenching and tempering |
| Wire Diameter | 16 mm – 45 mm, custom per OEM drawing |
| Manufacturing Process | CNC hot coiling, controlled heat treatment, shot peening |
| Inspection | Load deflection test, magnetic particle crack detection |
| Certification | ISO9001 / SGS material report |
| Warranty | 12 months or 2,000 operating hours |
OEM & Customization
Provide original part numbers, drawings, or samples. We match wire diameter, free height, coil pitch, load ratings, and surface coatings to OEM specifications.
Applicable Models
| Machine Type | Compatible Brands | Popular Series/Models |
|---|---|---|
| Crawler Bulldozer | John Deere | 450G, 450H, 550G, 550H, 650G, 650H, 700H, 750J, 850J |
| Crawler Loader | John Deere | 455G, 555G, 655H |
Delivery & Logistics
Factory-direct pricing, flexible MOQ from 10 pieces, export-grade packaging, and reliable ocean or air freight. Standard lead time is 15–25 days after deposit.
Technical Features
The coil spring functions as an energy storage device in the recoil system, absorbing track shock loads and protecting the final drive and idler assembly.
Shot peening induces compressive residual stress on the spring surface, delaying fatigue crack initiation and extending service life under cyclic loading.
Precise tempering stabilizes the spring modulus, preventing permanent deformation that causes track tension loss and accelerated undercarriage wear.
Applications
- Open-pit mining and quarrying
- Highway and road construction
- Land clearing and forestry operations
- Demolition and site preparation
- Waste handling and landfill compaction
Frequently Asked Questions
What is the MOQ for John Deere bulldozer spring coils?
10 pieces per specification. Mixed models are accepted for trial orders.
What is the standard delivery time?
15–25 days after deposit confirmation. Custom tooling or large quantities may extend production.
How deep is the heat treatment?
Hardening is controlled through the full wire section, achieving HRC 45–52, not just surface hardness.
What warranty do you provide?
12 months or 2,000 operating hours from installation, covering fatigue fracture and permanent set under normal conditions.
Can you match by OEM part number?
Yes. Provide John Deere part numbers or drawings; we cross-reference dimensions and load ratings to supply direct replacements.
Do you offer samples before bulk production?
Yes. Sample springs can be produced for fit and load testing before mass production.
What spring steel do you use?
60Si2MnA or 55CrSiA spring steel, selected according to OEM load and fatigue requirements.
How do you control batch quality?
Every batch undergoes dimensional inspection, load deflection testing, hardness checks, and magnetic particle crack detection.
Maintenance Guide
- Inspect spring coils every 500 operating hours for coil gap changes, surface cracks, or corrosion pitting.
- Check track sag and recoil tension; incorrect adjustment increases spring fatigue and accelerates undercarriage wear.
- Replace springs when free height drops more than 3% or load loss exceeds 10% from OEM specification.
- Align recoil housing and linkage before reassembly, and torque fasteners to OEM values to prevent side loading.