Hitachi-EX1200-6 Final Drive Sprocket Assembly/Heavy-duty Excavator Undercarriage Sprockets manufacture and Supplier
Product Specifications
Hitachi EX1200-6 Final Drive Sprocket Assembly: Technical Overview & Specifications
Optimized for Replacement, Durability & Global Compatibility
The Final Drive Sprocket Assembly is a mission-critical component in Hitachi’s EX1200-6 hydraulic excavator, responsible for transferring power from the travel motor to the tracks. Designed for extreme mining, quarrying, and heavy construction applications, this assembly ensures optimal torque conversion, smooth mobility, and resistance to shock loads.
Key Structural Components
Sprocket Wheel
Material: Forged alloy steel (ISO 683-1 standard)
Teeth Profile: 9–11 teeth (heat-treated to 55–60 HRC) with induction-hardened flanks
Role: Engages with track links to propel the excavator.
Hub Assembly
Construction: Precision-machined ductile iron (Grade 450-10)
Mounting: Bolted to the planetary gear carrier via high-tensile ISO 10.9 bolts.
Planetary Reduction Gearbox
Gear Ratio: 18:1–22:1 (model-specific)
Gears: Case-hardened 20CrMnTi planetary gears running on tapered roller bearings.
Sealing System
Primary Seal: Labyrinth + triple-lip oil seals (NOK or Parker Hannifin)
Protection: IP69K-rated against mud, dust, and submersion.
Flange & Bearing Housing
Bearings: Oversized Timken®/NSK tapered rollers (Dynamic Load Rating: 800+ kN)
Housing: SAE G3000 cast iron with anti-corrosion coating.
Technical Specifications
| Parameter | Value |
|---|---|
| Compatibility | Hitachi EX1200-6 (2008–2016) |
| Part Number | 4661591 (OEM) |
| Weight | 200–220 kg |
| Oil Capacity | 9–11 liters (ISO VG 68) |
| Torque Capacity | 120,000 Nm (peak) |
| Operating Temp | -30°C to 120°C |
Failure Signs & Maintenance
Symptoms: Grinding noises, track slippage, oil leaks, uneven sprocket wear.
Lifespan: 8,000–12,000 hours (subject to operating conditions).
Maintenance: Biannual oil analysis + seal inspections.
Global Replacement Options
OEM Parts
Source: Hitachi Construction Machinery (Japan/Netherlands)
Warranty: 12 months (global coverage).
Aftermarket Alternatives
Top Brands: EVER-POWER (China), Komatsu Group (India)
Standards: ISO 9001-certified manufacturing; RoHS-compliant materials.
Cost: 30–40% lower than OEM.
GEO-Optimized Purchasing Guide
North America/Europe: Ships from US/EU warehouses (5–7 days delivery).
Asia-Pacific: Sourced via India/China suppliers (sea/air freight options).
Critical Note: Verify model suffix (-6) compatibility – EX1200-5 ≠ EX1200-6!
Why Choose This Assembly?
Durability: Forged components withstand 40+ ton operational weight.
Efficiency: Precision-ground gears reduce energy loss by 15%.
Global Logistics: DDP (Delivered Duty Paid) support to 100+ countries.
