4661485 Boom Cylinder Seal Kit for Hitachi Excavators ZX200 ZX210 Series Repair
4661485 Boom Cylinder Seal Kit Critical Compatibility
4661485 Boom Cylinder Seal Kit designed exclusively for boom cylinders in Hitachi’s HCM-9G hydraulic system. Ensures zero leakage during heavy lifting and deep excavation. Certified for all sub-models including:
- Standard: ZX200-3, ZX200LC, ZX210-3, ZX210LC-3
- Specialty: ZX210W (wheeled), ZX240-AMS (hybrid), ZX210-HCME (emissions-compliant), ZX210H (high-altitude)
4661485 Seal Kit Technical Specifications
| Bore/Rod Size | Ø140mm (5.51″) / Ø95mm (3.74″) |
| Working Pressure | 35 MPa (5,077 PSI) │ 42 MPa peak |
| Temp Range | -40°C to +130°C (-40°F to 266°F) |
| Primary Seal Material | FKM Fluoroelastomer (85D hardness) |
| Secondary Seals | HNBR80 O-rings (oil-swell optimized) |
| Wear Band | Carbon-reinforced PTFE (CoF ≤0.018) |
| Cylinder Stamp Requirement | ”HCM9G-140/95″ cast marking |
Seal Kit Contents
| 4-Lip Piston Seal (FKM) | 42 MPa dynamic sealing (patented wedge design) |
| Hydraulic Scraper (HNBR) | Removes micro-contaminants ≥5μm |
| Zero-Friction Wear Ring | Carbon-PTFE composite (0.08mm clearance) |
| Pressure-Actuated U-Cup | Prevents blowout during hammer operation |
| Triple-Action Buffer Seal | Dampens pulsations from hydraulic breakers |
| Anti-Extrusion Rings (PEEK) | Withstand side loads in tight-tail-swing models |
| Gland Seals (FKM High-Temp) | +130°C steam-cleaning resistant |
Performance Validation
✅ Zero Drift Under Load: <0.5° boom sag with 8-ton suspended load
✅ 40,000-Hour Service Life: PTFE wear bands reduce cylinder scoring by 60%
✅ Extreme Environment Proof: FKM seals outperform NBR in arctic/desert conditions
✅ Hammer-Ready Design: No failure at 180 bpm impulse frequency
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