Wholesale Excavator Parts Hydraulic Seal Kit fit Hitachi Digger
High-performance Hitachi Excavator Hydraulic Seal Kit designed for leak-free operation, precise cylinder fit, and long-lasting durability. Perfect for boom, arm, and bucket cylinder rebuilds, ensuring reliable performance in demanding construction environments.
| Material | NBR/ PTFE/ ACM/ VMQ/ FKM/ HNBR/ EPDM/ Silicone and etc |
|---|---|
| MOQ | 5 Pieces |
| Pressure | Up to 690bar(10000psi) |
| Working Temperature | -40–120℃(according to the material) |
| Color | Black/Orange/Brown/White/Brown |
Quick Quote Request
Kinton Seals is trusted by professionals worldwide for providing high-quality seal kits for excavators, dozers, loaders, and other heavy machinery, ensuring reliable performance and long-lasting durability.
The Hitachi Excavator Hydraulic Seal Kit provides a complete sealing solution for maintaining the efficiency and reliability of hydraulic cylinders. Designed to prevent fluid leakage, protect pistons and rods from wear, and sustain consistent pressure, this kit ensures your excavator delivers maximum digging force and lifting capacity.
Hydraulic seals are essential for keeping hydraulic systems contamination-free and maintaining smooth cylinder operation. With a full range of seals included, this kit supports complete cylinder maintenance, reducing downtime and extending machine life.
Manufacturing Process
Before being assembled into complete kits, every seal undergoes strict quality-controlled production steps, ensuring consistent performance and reliability.
Step-by-Step Manufacturing:
Precision Material Weighing
Each raw material block is carefully weighed with high-accuracy equipment before processing. This ensures that every seal ring starts with the exact material volume required for its specific size and application, preventing inconsistencies in density or performance.
Mold Preparation & Material Placement
After weighing, the prepared material is positioned onto the appropriate mold. Our workshop is equipped with a wide variety of molds to match different seal ring diameters and cross-sections. The correct mold selection guarantees precise shaping, while careful placement avoids defects such as uneven thickness.
High-Pressure Compression Molding
The molds are then set under specialized compression machines, where controlled pressure and temperature are applied. This process allows the material to be fully formed into a durable seal with consistent hardness and elasticity. Strict monitoring ensures every batch meets dimensional accuracy and structural integrity.
Rigorous Quality Inspection
Each batch of seals undergoes rigorous testing after molding. Technicians check for dimensional accuracy, surface smoothness, hardness, and sealing resilience. Any defective products are filtered out, ensuring that only seals with stable performance and long service life proceed to packaging.
OEM Compatibility & Fitment
Our Hitachi hydraulic seal kits are suitable for a wide range of excavator models, including:
- EX60, EX120, EX200, EX300, EX350 series
- ZX70, ZX120, ZX200, ZX240, ZX330, ZX350, ZX470 series
- Compatible with boom, arm, and bucket cylinder rebuilds
- OEM reference part numbers available upon request
Designed as a direct OEM replacement, the kit ensures accurate fit and optimal performance.
| part numbers | ||||||||
|---|---|---|---|---|---|---|---|---|
| 4255532 | 4352341 | 4352354 | 4352357 | 4369901 | 4465644 | 4485612 | 4639939 | 4640107 |
| 4640118 | 4649745 | 4649751 | 4649752 | 4652906 | 4448400 | 4448398 | 4448399 | 4647596 |
| FYA00001398 | YA00003778 | YA00001392 | YA00001400 | YA00001396 | YA00000745 | ZAX330 track adjuster seal kit | ||
| EX60-2 Arm cylinder seal kit | EX60-2 Boom cylinder seal kit | EX60-2 Bucket cylinder seal kit | ||||||
| EX215 Arm cylinder seal kit | EX215 Boom cylinder seal kit | EX215 Bucket cylinder seal kit | ||||||
| EX215 Center joint seal kit | EX215 Swing motor seal kit | FH200-2 Arm cylinder seal kit | ||||||
| FH200-2 Boom cylinder seal kit | FH220 Gear pump seal kit | FH220 Main pump seal kit | ||||||
| FH220 Center joint seal kit | FH220 Travel motor seal kit | FH270-3 Center joint seal kit | ||||||
| FH330 Main pump cylinder seal kit | FH330 Center joint seal kit | FH330 Travel motor seal kit | ||||||
| ZX30U Center joint seal kit | ZX130 Arm cylinder seal kit | ZX210 Arm cylinder seal kit | ||||||
| ZX210 Boom cylinder seal kit | ZX210 Bucket cylinder seal kit | ZX350LCH-5G Bucket cylinder seal kit | ||||||
| EX350-5 boom seal kit | ZAX200 bucket seal kit | ZAX330 boom seal kit | ||||||
If you can't find the serial number you need, please contact us.
Quality Assurance
Every kit is tested and verified to meet or exceed OEM performance standards, ensuring:
- Leak-free performance even under high hydraulic pressure
- Long-lasting wear resistance in demanding applications
- Accurate fitment to reduce errors during installation
- Reliable operation in heavy-duty construction and mining environments
Maintenance Recommendations
To maximize the efficiency of your Hitachi excavator’s hydraulic cylinders:
- Inspect seals regularly for leaks, cracks, or wear
- Replace seals during scheduled cylinder maintenance or rebuilds
- Use only approved hydraulic fluids and maintain correct system pressure
- Keep cylinder rods clean to avoid contamination and premature seal damage
Material Overview for Seal Kits
Each seal kit is composed of selected elastomers and polymers, chosen for their performance under different working environments:
Nitrile Rubber Buna(NBR, BUNA-N)
Temperature Range:-30 to 125 ℃
Hardness:60-90 Shore A
Color: Black
Use: Oil & Water Resistance Situation Advantage: Excellent oil resistance, performance and stability, widely used, cheaper
Fluororubber(FKM,FPM)
Temperature Range:-20 to 250℃
Hardness:70-90 Shore A
Color: Black/Brown/Green
Use: Oil & Chemical Resistance Situation
Advantage: Wear resistance, acid and alkali resistance, high temperature resistance situation
Silicone (VMQ )
Temperature Range: -60 to 225 ℃
Hardness: 50-70 Shore A
Color: Red/Black/Blue/White/Transparent, etc
Use: Heat& Food Situation(FDA, RoHS Approved)
Advantage: Good heat resistance, cold resistance, lubrication oil resistance, water resistance safety & reliable to human body
Ethylene Propylene Rubber(EPDM, EPM)
Temperature Range:-50 to 150 ℃
Hardness: 60-90 Shore A
Color: Black
Use: Ozone, water vapor situation
Advantage: Excellent oxidation resistance ozone resistance and erosion resistance
Perfluoroelastomer(FFKM, FFPM)
Temperature Range: -42 to 327 ℃
Hardness:60-95 Shore A
Color: Black / White
Advantage: Long-term, proven performance, can mean less frequent seal changes, repairs and inspections, increasing process and equipment uptime in productivity and yield.
Neoprene Rubber(CR )
Temperature Range:-30 to 125 ℃
Hardness:60-90 Shore A
Color: Black
Use: Oil & Water Resistance Situation Advantage: Excellent oil resistance, performance and stability, widely used, cheaper
Application Scenarios
- Heavy construction projects requiring continuous hydraulic reliability
- Mining, quarrying, and material handling operations
- Excavator repair and maintenance workshops performing cylinder rebuilds
- Earthmoving, trenching, and demolition environments where hydraulic performance is critical
Contact & Ordering
For inquiries or orders, please contact our sales team. Provide your excavator model and cylinder type for accurate kit selection and prompt delivery. We offer professional support and export-ready packaging for global customers.
At Kinton Seals, we understand that reliable delivery is just as important as product quality. Our goal is to ensure that every order of Seal Kits for excavators, bulldozers, wheel loaders, and other heavy machinery reaches our customers safely, on time, and in perfect condition.
Packaging & Protection
- Standard Export Packaging – Each seal kit is carefully packed in moisture-proof and dust-proof bags, ensuring seals remain clean and undamaged during storage and transportation.
- Layered Protection – Kits are placed in sturdy cartons, and for bulk shipments, cartons are further reinforced with pallets and stretch film to minimize impact during handling and transit.
- Customization Options – We provide OEM/ODM packaging services, including branded boxes, barcodes, and special instructions, helping partners strengthen their brand presence in local markets.
- Extra Protection – For bulk shipments, cartons and pallets are reinforced to reduce the risk of damage in transit.
Order Processing & Lead Time
- Standard Seal Kits – For large quantity orders, lead time is usually 7–10 working days, as each kit requires precise matching of every seal, followed by labeling and packaging.
- Custom Seal Kits – For tailored requirements or non-standard models, production and assembly typically take 15–30 days, especially if new tooling or mold development is required.
- Sample Orders – Small batch or sample kits can often be prepared faster, subject to stock availability.
Delivery Options
- Air Freight for urgent orders
- Sea Freight for bulk shipments
- Courier Express (DHL, FedEx, UPS) for small packages and samples
Quick Quote Request
Kinton Seals is trusted by professionals worldwide for providing high-quality seal kits for excavators, dozers, loaders, and other heavy machinery, ensuring reliable performance and long-lasting durability.
