4448398 Boom Cylinder Seal Kit for Hitachi Excavators ZAX200
4448398 Boom Cylinder Seal Kit Product Overview
4448398 Boom Cylinder Seal Kit performance for Hitachi excavators repair (ZAX200/ZAX210/ZAX225USR, ZAX200-3/6/8, ZAX210-3, ZAX225US-3, ZAX200-3G/5G etc). Prevents boom drift, hydraulic leaks, and power loss in demanding operations. Compatible with 12+ major Hitachi variants.
Hydraulic Seal Kit Specifications
| Compatible Models | ZAX200/ZAX210/ZAX225USR, ZAX200-3/6/8, ZAX210-3, ZAX225US-3, ZAX200-3G/5G etc |
| Cylinder Bore/Rod | 145mm (5.71″) / 110mm (4.33″) (HIT-CLASS 4S/4U) |
| Pressure Rating | 32.4 MPa continuous │ 40 MPa dynamic peak |
| Temperature Range | -25°C to +110°C (-13°F to +230°F) |
| Seal Material | NBR90 + Polyurethane + Zinc-Plated Steel Backup |
| Standards | Hitachi HCM-9F │ JIS B 2401:2019 │ ISO 3601-1 |
4448398 Seal Kit Contents
| Steel-Reinforced PU Seal | 40 MPa shock load resistance |
| NBR90 Step Seal | Zero-leak rod sealing (0.005mm clearance) |
| PTFE Coated Guide Band | <0.025 friction coefficient |
| 5-Lip Wiper (Green PU) | Nano-particle exclusion (99% >15μm) |
| Anti-Extrusion Rings | Zinc-plated steel, prevents seal blowout |
| HNBR O-Rings | Chemical/UV resistant static seals |
| Matches Hitachi Drawing HCM9F-BOOM-SK05 | |
Key Benefits
✅ Eliminates Boom Drift: Holds 32.4 MPa for 72+ hrs (per JIS B 8393 leak test)
✅ Enhanced Contaminant Defense: 5-lip wiper exceeds ISO 4406:19/17/14 cleanliness
✅ Hammer Drill Compatible: Withstands 40 MPa pulsations from HB205/210 breakers
✅ Corrosion Protection: Zinc plating prevents saltwater degradation
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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