PU/NBR seal components for Hitachi arm cylinder

Mid-arm cylinder rebuild kit Hitachi EX150-5

Hydraulic seal set 4389720 for Hitachi excavators

Arm Cylinder Seal Kit 4389720 for Hitachi EX150-5 Excavator YNF16370

Durable arm cylinder seal kit 4389720 for Hitachi EX150-5; OEM-quality repair for excavator hydraulic system.

Direct replacement for Hitachi part number 4389720
Specifically engineered for EX150-5 arm hydraulic cylinder
Complete kit includes piston seals, rod seals, dust seals, wear rings
Built from high-performance PU, NBR, and PTFE materials
Ensures leak-free, high-pressure performance in rugged environments

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Arm Seal Kit Description

The YNF16370 arm cylinder seal kit, compatible with OEM part 4389720, provides a complete solution for rebuilding the arm hydraulic cylinder of the Hitachi EX150-5 excavator. The kit contains precision-manufactured sealing components that restore full hydraulic function, reduce internal leakage, and protect the cylinder’s structural integrity. Made from materials like PU, NBR, and PTFE, it withstands pressure fluctuations, hydraulic oil exposure, and mechanical stress. Ideal for repair workshops, fleet maintenance operations, and B2B parts suppliers, this kit is a key inventory item to support fast turnaround repairs and extend machine life.

Arm Cylinder Seal Kit Technical Sheet

Parameter	Description
Machine Model	Hitachi EX150-5
OEM Part Number	4389720
YNF Part Number	YNF16370
Product Category	Arm Cylinder Hydraulic Seal Kit
Material	PU, NBR, PTFE
Operating Pressure	Up to 350 bar
Temperature Range	-30°C to +110°C
Components Included	Rod seal, piston seal, dust seal, wear ring
MOQ	5 Sets
Brand	YNF
Origin	China
Shipping Method	Air, Sea, Express
Payment Terms	T/T, L/C, Western Union

Arm Cylinder Seal Kit Applications

Application Industry	Description
Excavator Repair & Service	Hydraulic seal restoration for mid-arm cylinder
Heavy Equipment Maintenance	Prevents fluid leakage and extends cylinder life
Aftermarket Parts Supply	High-demand spare for Hitachi EX series
Construction Machinery Shops	Stocked for frequent repair needs

Hitachi Arm Seal Kit YNF16370 Detail Display

FAQs

Related Knowledge:

Cylinder seal kits must match specific bore and rod dimensions to ensure proper compression.
Regular seal replacement helps avoid internal fluid bypass and cylinder scoring.

Related Products:

Boom cylinder seal kit 4389719
Bucket cylinder seal kit 4389721 for EX150-5
Control valve repair kit for Hitachi ZX series

FAQs:

What’s the difference between boom and arm seal kits?
Each kit is tailored to cylinder dimensions and operating loads of its specific application.
Are the seals suitable for bio-oil hydraulic systems?
Standard kits are for mineral oils; bio-oil compatible materials are available upon request.

Request Price for Seal Kit 4389720

The YNF16370 arm seal kit is trusted by excavator repair professionals for its OEM-grade reliability and long-term durability. Compatible with Hitachi EX150-5, it’s the perfect solution for mid-arm cylinder maintenance. Contact us today to secure your inventory and get the best wholesale deal.

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