71445777 Bucket Cylinder Seal Kit for Fiat Hitachi FH130-3
Critical Compatibility
71445777 Bucket Cylinder Seal Kit exclusively designed for Fiat Hitachi FH130-3 repair, ensuring seamless fit and reliable operation in construction, agriculture, and light mining applications:
- Applicable Models:
- Fiat Hitachi FH130-3 (Standard Configuration)
- Compatible with standard-reach buckets and optional heavy-duty buckets
Technical Specifications
| Operating Pressure | 28 MPa (4,060 PSI) continuous │ 42 MPa (6,090 PSI) surge |
| Temperature Range | -20°C to +100°C (-4°F to 212°F) (with Arctic-grade seals) |
| Dynamic Seal Material | HNBR85 (hydrolysis-resistant nitrile – 25% better abrasion resistance than standard HNBR) |
| Static Seal Material | FKM75 Fluoroelastomer (ozone/chemical-resistant – withstands hydraulic oil additives) |
| Wear Components | Carbon-PTFE Composite Bushings (CoF ≤0.03 – 30% lower friction than generic) |
| Extrusion Resistance | PEEK-Woven Fiber Rings (55MPa yield strength – resists gasket blowout under surge) |
Seal Kit Contents
| Component | Engineering Purpose |
|---|---|
| Heavy-Duty U-Cups | Primary pressure sealing (42MPa burst resistance – tested to 55MPa) |
| Thermal-Compensating Rod Seals | Auto-adjusts for -20°C to +100°C expansion (prevents cold cracking/hot leakage) |
| 3-Stage Dust Wiper System | Blocks >12μm contaminants (ISO 4406:19/17/14) – 99% efficiency in dusty sites |
| Low-Friction Guide Bands | Carbon-PTFE composite (reduces rod wear by 50% vs. aftermarket) |
| Shock-Absorbing Buffers | PEEK-woven fiber blend (protects seals from 150G impact shocks – common in light digging) |
| Anti-Extrusion Washers | High-strength polyamide (prevents seal blowout at 42MPa surge pressures) |
| Gland O-Rings (FKM) | Seals gland cover to cylinder barrel (swell-resistant in hot oil – 500hr immersion tested) |
| Assembly Paste | Hitachi Hyd-Lube 300 (P/N HT-7728, synthetic grease with moly) |
| Cylinder Honing Stone | Precision Rz ≤1.6μm bore finishing (prevents post-install micro-leaks) |
Performance Validation
✅ Zero Leakage Under Load: Passes 72hr pressure test at 50MPa (7,250 PSI) with no visible seepage
✅ Long-Term Endurance: 8,000-hour service life in European construction sites
✅ Extreme Condition Ready: Withstands -20°C cold starts (no cracking) and +100°C oil temperatures
✅ Dust Defense Superiority: 3-stage wiper system reduces rod scoring by 70% vs. generic kits
Frequently Asked Questions (FAQ)
Q: Do you have any other excavator model repair seal kits ?
A: Yes. As the professional excavator seal kits manufacturer, we produce all the excavators repair seal kits, standard sizes and also support customization. Please tell us the part number seal kit you want.
Q: I can’t find the model I want. Are all your seal repair kits here?
A: No. We have more than tens of thousands seal kits. Here only a small part of them is shown. We have stock of all the seal kits for construction machinery. Please contact us!
Contact Us
For more information or to request a quote, please contact us or directly email [email protected].
