4391321 Boom Cylinder Seal Kit for Hitachi EX750-5 EX800H-5 Excavator
4391321 Boom Cylinder Seal Kit for Hitachi EX750-5 EX800H-5 Excavator. Premium aftermarket replacement for hydraulic cylinder repair. Please confirm the OEM part number and machine.
Brand: WINSCHEN
Country of Origin: China
MOQ: 1 SET
Dispatch time: 1-3 business days
SKU: HIT-4391321
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4391321 Boom Cylinder Seal Kit for Hitachi Equipment
Eliminate hydraulic fluid leaks and restore the massive lifting power of your heavy-duty excavator with the WINSCHEN premium 4391321 Boom Cylinder Seal Kit. Engineered specifically to withstand the extreme operational pressures, massive heavy-duty payloads, and highly abrasive environments of large-scale quarrying and mining, this high-quality aftermarket repair kit ensures your Hitachi equipment operates safely and efficiently with zero pressure loss.
Key Features
- Manufactured to strict OEM dimensions, ensuring a precise and seamless fit for the boom hydraulic cylinders used in large-class Hitachi EX750-5 and EX800H-5 excavators.
- Constructed from advanced elastomeric, polyurethane, and heavy-duty PTFE materials to provide exceptional resistance to high hydraulic pressure spikes, continuous rod friction, and extreme thermal variations common in mining applications.
- Effectively eliminates internal fluid bypass and external leakage, preventing boom drift and maintaining highly responsive, consistent lifting force for massive bucket loads.
- This comprehensive seal kit includes all essential precision components—such as heavy-duty rod seals, dust wipers, buffer rings, and O-rings—required for a complete and reliable boom cylinder overhaul.
- A cost-effective, highly reliable aftermarket alternative that meets or exceeds original equipment standards, significantly minimizing your machine’s routine maintenance downtime and maximizing quarry production.
Compatible Equipment Models
Excavators: EX750-5, EX800H-5
Seal Kit Related Parts
| Part No | Qty | Parts name |
|---|---|---|
| 0379806 | 1 | Bushing |
| 0417405 | 1 | Ring |
| 4094949 | 1 | Packing, U-Ring |
| 0242505 | 1 | Ring, Back-Up |
| 0242506 | 1 | Ring, Wiper |
| 4438196 | 1 | Ring, Wiper |
| A811190 | 1 | O-Ring |
| 0257007 | 1 | Ring, Back-Up |
| 0645006 | 1 | Seal, Cushion |
| 0257010 | 1 | Ring, Seal Assy |
| 0645008 | 2 | Ring, Slide |
| 4199817 | 2 | Ring, Slide |
| 4251767 | 4 | Ring, Wiper |
Specifications
| Part Number | 4391321 |
| Part Type | Boom Cylinder Seal Kit / Service Kit |
| Application | Hydraulic Cylinder Rebuild |
| Brand | WINSCHEN |
| Country of Origin | China |
| SKU | HIT-4391321 |
| MOQ | 1 SET |
| Delivery Time | 1-3 business days |
To ensure proper fitment, please verify your machine’s exact model and original hydraulic cylinder configuration with our support team prior to purchasing. We offer fast global shipping to keep your heavy machinery operating efficiently.
Related Hitachi Seal Kit Categories
Browse more Hitachi replacement parts or compare other hydraulic cylinder seal kits. For fitment confirmation, send the OEM part number, machine model through our inquiry form or WhatsApp.
| OEM Part Number | 4391321 |
|---|---|
| Equipment Brand | Hitachi |
| Product Type | Boom Cylinder Seal Kit |
| Condition | Premium Aftermarket Replacement |
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