The YNF17479 Arm Cylinder Seal Kit is designed for Hitachi EX100-5 excavators with a 75 mm rod diameter, specifically for the arm hydraulic cylinder. This seal kit provides a complete sealing solution to prevent hydraulic oil leakage, maintain stable pressure, and ensure smooth arm operation under demanding working conditions.

• OEM-equivalent replacement for 4379261

• Compatible with Hitachi EX100-5 arm cylinders (75 mm rod)

• Complete seal kit including oil seals, O-rings, and backup rings

• High-quality materials resistant to hydraulic oil, heat, and pressure

• Precision-manufactured for OEM-standard fit and reliable sealing

• Ensures smooth arm movement and leak-free performance

• Suitable for cylinder overhaul, repair, or preventive maintenance

• Long service life in heavy-duty construction environments

• Machine model: Hitachi EX100-5 excavator

• Component: Arm Cylinder Seal Kit

• Used for sealing the arm (middle boom) hydraulic cylinder

• Suitable for construction machinery maintenance and repair

• OEM number and model compatibility confirmation

• Technical support for installation and application

• Stable supply for dealers, workshops, and service centers

• Custom seal kits available upon request

• Seals packed in individual protective plastic bags

• Export-standard cartons for safe transportation

• Neutral packing or YNF-branded packaging available

• Supports combined shipment with other excavator spare parts

Q1: Is this seal kit suitable for the original EX100-5 arm cylinder?
A: Yes, it is manufactured according to OEM specifications and fits the original cylinder.

Q2: Does this kit support high-pressure hydraulic systems?
A: Yes, all seals are designed to withstand high pressure and heavy-duty operation.

Q3: Can this seal kit be used for preventive maintenance?
A: Yes, it is ideal for both routine maintenance and cylinder repair.