8605261 Steering Cylinder Seal Kit for Case Wheel Loader 521G 621E 621F 721E 721D
8605261 Steering Cylinder Seal Kit Critical Compatibility
8605261 Steering Cylinder Seal Kit – Factory Replacement for Case 521G/621E/621F/721E/721D Wheel Loaders with hydraulic articulation:
- Core Models: 521G • 621E • 621F • 721E • 721D
- Cylinder Markings: Requires “CASE-STEER-7” casting ID
- Exclusions: 521F (use 8605103) │ 721G (requires 8605400)
8605261 Seal Kit Technical Specifications
| Bore/Rod Size | Ø100mm (3.94″) / Ø55mm (2.17″) |
| Operating Pressure | 35 MPa (5,077 PSI) continuous │ 42 MPa peak |
| Temperature Range | -40°C to +130°C (-40°F to 266°F) |
| Primary Seal Material | HNBR90 (Hydrogenated Nitrile) |
| Static Seals | FKM Fluoroelastomer (85 Shore A) |
| Wear Band | Bronze-Filled PTFE (CoF ≤0.028) |
| Articulation Angle | ±45° continuous oscillation rating |
Seal Kit Contents
| Dual-Action Piston Seal | 42MPa pressure-rated HNBR90 compound |
| Rod Scraper System | 3-stage wiper (blocks >10μm contaminants) |
| Low-Friction Guide Band | PTFE-bronze composite (0.05mm clearance) |
| Anti-Extrusion Rings (PEEK) | Prevents seal blowout during full-turn impacts |
| Rotary Joint Seals | FKM static seals for articulation points |
| Buffer Seals (HNBR) | Absorb pressure spikes from uneven terrain |
| Grease Capsule | Case Ultra-Tac Assembly Lube (P/N 87418301) |
Performance Validation
✅ Zero Steering Drift: Holds articulation angle within 0.5° after 24hrs
✅ Shock Load Protection: Withstands 42MPa impacts during high-speed pivot turns
✅ Contaminant Defense: Triple-lip scraper exceeds ISO 4406:18/16/13 cleanliness
✅ Arctic Reliability: -40°C cold-start capability
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