Case Spring Coil: Engineered Recoil Tension For Undercarriage Systems
Dingtai manufactures Case spring coils—the critical recoil springs that absorb track tension and shock loads in excavator undercarriage systems.
We provide factory-direct manufacturing with comprehensive OEM services, supplying global distributors and equipment owners with exact-fit replacement coils.
Our spring coils prevent premature track wear and undercarriage damage by maintaining consistent tension and absorbing impact from rough terrain operation.
With over 20 years of experience, Dingtai holds ISO9001 and SGS certifications, guaranteeing consistent metallurgical quality and dimensional accuracy for every batch.
Each spring coil uses premium 35MnB alloy steel with deep quenching and precision heat treatment to achieve optimal hardness and fatigue resistance.
Core Selling Points
- Premium 35MnB Material: Every recoil spring coil is forged from premium 35MnB alloy steel, delivering superior tensile strength and resistance to deformation under continuous heavy load.
- Deep Quenching/Heat Treatment: Our deep quenching process hardens the full cross-section of each coil, achieving uniform HRC values that prevent surface cracking and fatigue failure.
- 100% QC Inspection: Each spring coil undergoes dimensional verification, hardness testing, and compression load testing before shipment, ensuring zero-defect delivery for your operations.
- Global Brand Compatibility: Our spring coils are precision-engineered to match original Case part numbers, guaranteeing drop-in fitment across CX-series excavators and bulldozers.
Product Catalog
Our catalog of Case spring coils includes various specifications, fully compatible with Case excavators and bulldozers.
Why Choose Dingtai?
1. Production Technical Parameters
| Specification | Parameter |
|---|---|
| Material | 35MnB Alloy Steel (60Si2Mn optional) |
| Hardness | HRC 42–48 |
| Manufacturing Process | Hot Coiling, Deep Quenching, Shot Peening |
| Certification | ISO9001, SGS |
| Warranty | 12 Months / 2,000 Hours |
2. OEM & Customization
We match original drawings and custom dimensions precisely. Every coil is manufactured to strict OEM tolerance standards, ensuring reliable interchangeability with genuine Case components.
3. Applicable Models
| Machine Type | Compatible Brands | Popular Series/Models |
|---|---|---|
| Excavators | Case | CX130, CX210, CX240, CX350, CX470 |
| Bulldozers | Case | 650K, 750K, 850K, 1150K, 1650K |
4. Delivery & Logistics
We offer reliable sea and air shipping with factory-direct pricing. MOQ starts at five units, with flexible order quantities for trial orders.
Technical Features
The recoil spring coil operates inside the track tension cylinder, compressing to absorb sudden impact forces from rocks, debris, and uneven ground.
Hot coiling followed by deep quenching creates a uniform martensitic structure, maximizing fatigue life under repeated cyclic compression without permanent set.
Shot peening on finished surfaces introduces compressive residual stress, reducing crack initiation and extending service intervals in abrasive operating environments.
Applications
- Mining Operations
- Road Construction
- Quarrying and Aggregate
- Demolition Projects
- Forestry and Land Clearing
Frequently Asked Questions
What is the minimum order quantity for Case spring coils?
Our standard MOQ is 5 units per specification. Trial orders of 1–2 units are available for new clients.
What is the delivery time for spring coil orders?
Standard delivery is 15–25 days after order confirmation. Custom specifications may require 30–35 days.
How deep is the heat treatment on your spring coils?
Our deep quenching penetrates the full cross-section, achieving uniform hardness of HRC 42–48 throughout the coil.
Do you provide a warranty on spring coils?
Yes, we offer a 12-month or 2,000-hour warranty against manufacturing defects under normal operating conditions.
Can you match original Case part numbers?
Yes, provide the original part number and we will cross-reference or reverse-engineer to exact OEM specifications.
What material do you use for production?
We use premium 35MnB alloy steel as standard, with optional 60Si2Mn available for specific load requirements.
Maintenance Guide
Inspection Interval: Check spring coil compression and track tension every 250 operating hours to detect early signs of fatigue or sag.
Installation Tip: Always compress the spring coil with a calibrated hydraulic press; never use improvised tools that could damage the coil surface.
Wear Indicators: Replace the spring coil when visible cracks appear, free length shortens by 5%, or tension adjustment no longer holds.
Lubrication Check: Keep the recoil cylinder properly greased to prevent corrosion on the coil surface and ensure smooth compression cycles.