Excavator and bulldozer chain assembly
The Excavator/Bulldozer Track Chain Assembly (also called Undercarriage Track Chain) is a core component of the crawler drive system in heavy machinery. It consists of track links, track pins, track bushes, track shoes, and bolts, designed to support the machine’s weight and provide traction on rough terrain.
2. Product Classification
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By Machine Type
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Excavator Track Chain: Lighter to medium-duty, optimized for flexibility.
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Bulldozer Track Chain: Heavy-duty construction, high impact resistance.
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By Structure
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Segmented (Assembled): Replaceable individual links, cost-effective maintenance.
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Solid (One-Piece): Higher rigidity, ideal for large-scale machinery.
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By Material
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Alloy Steel: Standard, excellent wear resistance.
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Quenched Steel: For extreme conditions, extends service life by 30%.
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3. Core Components & Specifications
| Component | Material/Process | Key Parameters |
|---|---|---|
| Track Link | 40Mn2 Alloy Steel, Induction Hardened | Hardness HRC45-50, Tensile Strength ≥850MPa |
| Track Pin/Bush | 20CrMnTi, Carburizing & Quenching | Surface Hardness HRC58-62, Core Hardness HRC30-35 |
| Track Shoe | NM360 Wear-Resistant Steel, Laser-Cut | Thickness 35-70mm, Bolt Hole Tolerance ±0.1mm |
| Seal Kit | NBR Rubber + Metal Ring | Temp. Range -30°C~120°C, IP68 Rating |
4. Technical Features
- Load Capacity: Static load ≥150 tons (e.g., Caterpillar D8T).
- Wear Resistance: Track link hardness ≥HB350, service life >5,000 hours (gravel conditions).
- Anti-Detachment Design: Chamfered pins + interference fit, lateral displacement ≤0.5mm.
- Lubrication: Long-life lithium grease, maintenance interval 200 hours.
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5. Compatible Models
- Excavators: CAT 320D, Komatsu PC200-8, SANY SY215, etc.
- Bulldozers: Shantui SD22, XCMG DG100, Liebherr PR736, etc.
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6. Selection Guide
- Sandy Terrain: Wider track shoes (≥600mm) to reduce ground pressure.
Mining Applications: Quenched steel links + reinforced bushes recommended.
7. Packaging & Shipping
- Wooden crates with anti-rust paper, single assembly weight: 1.2–3.5 tons (varies by model).
For further technical drawings or customized solutions, provide specific operational parameters.
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