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4669228 Hitachi EX1200 Arm Cylinder Aftermarket
4669228 Hitachi EX1200 Arm Cylinder Aftermarket
Replacement Arm Cylinder for Hitachi EX1200 Mining Excavator.
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OEM Part Numbers: 4669228, 4682481.
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Machine: Fits Hitachi EX1200-5 / -6 / -7 series.
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Durability: Induction hardened rod for mining environments.
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Fitment: Direct drop-in replacement.
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Warranty: 1 Year Factory Warranty.
The EX1200 Arm Cylinder is a premium aftermarket hydraulic replacement specifically engineered for the Hitachi EX1200 Mining Excavator series (EX1200-5, EX1200-6, EX1200-7). Manufactured by SEIGO Machinery, this heavy-duty cylinder serves as a direct, high-performance replacement for OEM Part Numbers 4669228 and 4682481.
Designed to match the rapid cycle times and high breakout forces of Hitachi’s giant excavators, our Arm Cylinders feature reinforced tube walls and upgraded seal packages to withstand the abrasive conditions of open-pit mining and mass earthmoving.
Technical Specifications
| Feature | Specification |
| Part Numbers | 4669228 / 4682481 |
| Machine Compatibility | Hitachi EX1200-5 / EX1200-6 / EX1200-7 |
| Position | Arm Cylinder / Stick Cylinder |
| Bore / Rod Diameter | Standard OEM Dimensions |
| Rod Material | 42CrMo4 Induction Hardened (Rock Impact Resistant) |
| Sealing System | NOK / Parker (High-Temp & Mining Grade) |
| Tube Material | ST52 / E355 High-Tensile Honed Tube |
| Warranty | 12 Months / 2000 Hours |
| Condition | 100% New Manufacturing |
Key Features & Durability
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Hitachi Mining Spec: Engineered strictly to the specifications of the EX1200 series. The cylinder geometry provides the exact range of motion and digging force as the original Hitachi component.
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Dual Part Number Match: Fully compatible with both 4669228 and 4682481, covering different generations of the EX1200 fleet to simplify your parts inventory.
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Hardened Protection: The piston rod undergoes deep induction hardening and micro-polishing to resist scoring from coal dust and rock debris, significantly extending seal life.
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High-Pressure Reliability: Equipped with advanced buffer seals to handle the intense hydraulic pressure spikes common in Hitachi’s “Full Power” digging modes.
Applications
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Open-pit coal and iron ore mining
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Large-scale quarrying operations
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Mass excavation projects
FAQ
Q1: Is 4669228 the same as 4682481?
A: Yes. Hitachi issued 4682481 as a production revision of 4669228, but the cylinders are dimensionally identical and fully interchangeable. Our shipping label lists both numbers.
Q2: Does this cylinder fit EX1200-5, EX1200-6, and EX1200-7?
A: Yes. All three EX1200 generations use the same arm cylinder design. Confirm your machine’s serial number with our engineering team before ordering for peace of mind.
Q3: How long is the lead time to Australia?
A: Standard production: 3-4 weeks. Sea freight Shenzhen → Perth/Brisbane: 10-14 days. Total lead time DDP Australia: 5-6 weeks. Air freight option available for mining emergency at 2-3 weeks total.
