The YNF16838 (9257552) Arm Cylinder Seal Kit and DU Bush is designed for Hitachi ZX330-1 excavators, providing a complete sealing and bushing solution for the arm (middle boom) hydraulic cylinder. Manufactured with premium rubber, polymer materials, and durable DU bushings, this kit ensures leak-free performance, smooth arm operation, and long-lasting durability under heavy-duty working conditions.

• Compatible with Hitachi ZX330-1 excavators

• Direct replacement for OEM part number 9257552

• Includes a full set of seals, O-rings, wear rings, and DU bushes for comprehensive arm cylinder maintenance

• Made with high-quality NBR, PU, PTFE materials and durable DU bushings resistant to wear, heat, and hydraulic oil

• Ensures stable, leak-free operation of the arm (middle boom) cylinder

• OEM-standard dimensions for easy installation and precise fit

• Suitable for both routine maintenance and full cylinder overhaul

• Enhances arm cylinder durability and overall excavator performance

• Machine model: Hitachi ZX330-1

• Component: Arm (Middle Boom) Hydraulic Cylinder

• Ideal for construction, mining, heavy-duty earthmoving, and demolition operations

• Installation guidance and technical assistance

• Pre-shipment photos and size confirmation

• Stable long-term supply for distributors and repair shops

• Custom cylinder seal kits and DU bush sets available upon request

• Seals and DU bushes packed individually in protective bags

• Export-standard cartons for safe shipping

• Optional neutral or YNF branded packaging

Q1: Can this kit fit other Hitachi models?
A: It is designed specifically for ZX330-1. Please provide OEM numbers or photos for compatibility verification.

Q2: What is the expected service life?
A: Typically 12–24 months, depending on working conditions and maintenance.

Q3: Can I combine this kit with other parts in one shipment?
A: Yes, mixed orders are fully supported.