Dingtai manufactures Mitsubishi bulldozer spring coils, precision-engineered recoil springs that maintain track tension and absorb impact load shock in undercarriage systems.
We provide factory-direct spring coil supply with complete OEM and aftermarket manufacturing services for dealers, distributors, and heavy equipment fleets worldwide.
High-tensile spring coils resist fatigue deformation and breakage, preventing track derailment, reducing downtime, and shielding final drives from violent shock loads.
With more than 20 years of engineering experience and ISO9001/SGS-certified production, Dingtai supplies consistent metallurgical quality, dimensional accuracy, and dependable load-bearing performance.
Each coil uses 35MnB alloy steel, CNC coiling, and deep quenching to achieve stable hardness, high fatigue strength, and long service life.
Core Selling Points
- 20+ Years Experience: Over two decades of undercarriage component manufacturing provides proven process control, material selection expertise, and consistent field performance for heavy machinery fleets.
- Premium 35MnB Material: High-grade 35MnB spring steel delivers superior yield strength and impact toughness, resisting permanent set and fatigue failure under continuous bulldozer track loads.
- Deep Quenching/Heat Treatment: CNC coiling followed by deep quenching and tempering produces uniform hardness throughout the wire cross-section, extending spring recoil life in abrasive conditions.
- ISO9001/SGS Certified: Strict ISO9001 quality systems and SGS material verification ensure every spring coil meets dimensional, hardness, and load-test acceptance standards before shipment.
Product Grid Intro
Our catalog of Mitsubishi Bulldozer Spring Coils includes various specifications, fully compatible with Mitsubishi BD2, BS3, D65, D85, D155, and D355 bulldozer models.
Why Choose Dingtai?
1. Production Technical Parameters
| Parameter | Specification |
|---|---|
| Material | 35MnB / 60Si2Mn alloy spring steel |
| Process | CNC coiling, deep quenching, tempering, shot peening, load testing |
| Hardness | HRC 45-52 after heat treatment |
| Certification | ISO9001:2015, SGS material report |
| Warranty | 12 months or 2,000 working hours |
2. OEM & Customization
We produce from OEM drawings or physical samples, matching wire diameter, coil pitch, free length, and load rating to Mitsubishi specifications.
3. Applicable Models
| Machine Type | Compatible Brands | Popular Series/Models |
|---|---|---|
| Bulldozer | Mitsubishi | BD2G, BD2H, BS3, D20, D30 |
| Bulldozer | Mitsubishi | D40, D50, D60, D65, D80, D85 |
| Bulldozer | Mitsubishi | D155A, D355A |
4. Delivery & Logistics
Factory-direct pricing and flexible MOQ support both trial orders and scheduled fleet stock. Packed in export-grade crates, with delivery in 15–30 working days.
Technical Features
The spring coil operates inside the crawler recoil housing, absorbing idler impact energy and recovering track tension after shock loads.
Deep quenching and tempering refine the alloy steel microstructure, creating high yield strength and resistance to fatigue crack propagation under cyclic compression.
Precision coiling ensures even pitch and concentricity, distributing stress evenly across every coil and preventing localized deformation or premature failure.
Applications
- Mining and aggregate haul roads
- Heavy road construction
- Quarry and rock handling
- Forestry and land clearing
- Demolition and site preparation
- Large-scale earthmoving and infrastructure projects
Frequently Asked Questions
What is the MOQ for Mitsubishi bulldozer spring coils?
The standard MOQ is 10 pieces per specification. Trial samples can be arranged for first-time buyers.
What is the normal delivery time?
Production usually takes 15–30 working days after deposit, depending on order quantity and customization requirements.
What material and heat treatment do you use?
We use 35MnB or 60Si2Mn alloy spring steel, CNC coiling, deep quenching, tempering, and shot peening.
What warranty do you provide?
We provide a 12-month or 2,000-working-hour warranty against material defects and manufacturing faults under normal use.
Can you match a Mitsubishi OEM part number?
Yes. Send your OEM part number, drawing, or sample. We match dimensions, spring rate, and end coil configuration.
How do I confirm fitment for my Mitsubishi bulldozer?
Provide the machine model, serial number, and existing spring free height and wire diameter. Our engineers verify fitment before quotation.
Do you offer OEM packaging?
Yes, we offer neutral, customer-branded, or OEM packaging with barcode labels and shipping marks.
Maintenance Guide
- Inspection: Check coil for surface cracks, corrosion pitting, and coil deformation during scheduled undercarriage inspections, especially after heavy rock work.
- Measurement: Measure free length and wire diameter. A spring that has shortened beyond OEM tolerance indicates fatigue or permanent set and requires replacement.
- Installation: Replace spring coils in matched pairs per track frame. Ensure recoil spring housing is clean and properly greased before assembly.
- Tension Check: After installation, verify track sag matches OEM specification. Incorrect tension accelerates spring, idler, and track chain wear.
- Replacement Interval: In abrasive mining or demolition applications, inspect spring coils every 1,000 working hours and replace when load loss exceeds OEM limits.