71400282 Hydraulic Cylinder Seal Kit for Hitachi FH300 Excavator Repair
71400282 Hydraulic Cylinder Seal Kit Product Overview
Restore Hitachi FH300-1/FH300-2 excavators with 71400282 Seal Kit! HNBR/FKM seals for 35 MPa mining operations. ISO 9001 certified. 24-month warranty.
Technical Specifications
| Pressure Rating | 40 MPa (5,800 PSI) continuous │ 58 MPa surge (hammer mode) |
| Temperature Range | -30°C to +140°C (-22°F to 284°F) |
| Primary Seal Material | Cast Polyurethane (AU95) (hydrolysis-resistant) |
| Static Seals | FKM90 Fluoroelastomer (high-temp gland seals) |
| Wear Components | Carbon-PTFE Composite Bushings (CoF ≤0.03) |
| Buffer System | PEEK-Aramid Hybrid Rings (60MPa extrusion resistance) |
Seal Kit Contents
| Pressure-Actuated U-Cups | 58MPa burst resistance (AU95 compound) |
| Thermal-Compensating Rod Seals | Auto-adjusts for -30°C to +140°C expansion |
| Quadra-Lip Wiper System | ISO 4406:18/16/13 particle exclusion |
| Low-Friction Guide Bands | Bronze-PTFE composite (reduces rod wear by 45%) |
| Shock-Absorbing Buffer Rings | PEEK-aramid blend (protects seals from 180G impacts) |
| Anti-Extrusion Washers | Prevents seal blowout at 58MPa surge |
| Gland O-Rings (FKM) | Seals gland cover to cylinder barrel (swell-resistant) |
Performance Validation
✅ Zero Cylinder Drift: Maintains position within 0.8° after 48hrs
✅ Mine Duty Endurance: 14,000-hour service life in Australian iron ore operations
✅ Hammer/Vibratory Ready: Withstands 58MPa surges from Rammer G150/G200 breakers
✅ Contaminant Defense: 4-stage wiper blocks 99.2% >10μm particles
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