4448399 Arm Cylinder Seal Kit for Hitachi Excavators Repair
4448399 Arm Cylinder Seal Kit Product Overview
4448399 Arm Cylinder Seal Kit – OEM and Standard, excavators hydraulic seal arm cylinder repair kit for Hitachi ZAX200, ZAX210, and ZAX225 etc. Eliminates hydraulic leaks, maintains digging force accuracy, and prevents arm drift during heavy excavation.
4448399 Seal Kit Specifications
| Compatible Models | ZAX200/ZAX210/ZAX225USR, ZAX200-3/6/8, ZAX210-3, ZAX225US-3, ZAX200-3G/5G and more |
| Cylinder Bore/Rod | 130mm (5.12″) / 95mm (3.74″) (HIT-CLASS 3S/3U) |
| Pressure Rating | 31.5 MPa continuous │ 38 MPa dynamic peak |
| Temperature Range | -25°C to +110°C (-13°F to +230°F) |
| Seal Material | HNBR90 + Reinforced Polyurethane |
| Standards | Hitachi HCM-8E │ JIS B 2401:2019 │ ISO 3601-1 |
The Excavators Hydraulic Seal Kit Contents
| Pressure-Actuated U-Cup | 38 MPa dynamic load resistance |
| Step Seal (HNBR90) | Zero-leak rod sealing (0.004mm clearance) |
| Bronze-PTFE Guide Band | Reduces friction (CoF: 0.028) |
| 4-Lip Wiper (Green PU) | 99.5% particle exclusion (>12μm) |
| PTFE Anti-Extrusion Rings | Prevents seal deformation at 38 MPa |
| Static Seals (HNBR) | Chemical/thermal resistant O-rings |
Key Benefits
✅ Precision Arm Control: Maintains 31.5 MPa pressure for 60+ hours
✅ Abrasion Resistance: PU seals withstand silica-rich environments
✅ Hammer Drill Compatibility: Absorbs 38 MPa pulsations from HB180/190 breakers
✅ Corrosion Protection: HNBR compounds resist acidic contaminants
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!
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