New Excavator Hydraulic Cylinder Oil Seal Kit R290‑9 R300‑9 R305‑9 Arm Cylinder Seal 31Y1‑30111

Keywords: 31Y1‑30111, Arm Cylinder Seal Kit, Hydraulic Oil Seal Kit, Hyundai excavator seal parts, R290‑9 seal kit, R300‑9 arm cylinder seal, R305‑9 hydraulic repair kit, Excavator cylinder sealing spare parts

🔹Product Overview

This hydraulic arm cylinder seal repair kit, part number 31Y1‑30111, is a complete sealing maintenance set designed for Hyundai excavator R290‑9, R300‑9, R305‑9 arm (dipper) cylinder. It contains piston seals, rod seals, wear rings, O‑rings, dust seals and all required gaskets to rebuild the arm hydraulic cylinder. Made of high‑quality oil‑resistant rubber and PTFE composite material, our seal kit delivers excellent pressure‑resistance, anti‑wear and high‑temperature resistance. It is a perfect replacement to fix hydraulic oil leakage, cylinder pressure loss and slow arm movement faults.

🔹Detailed Specifications

🔹Key Features & Advantages

✅ Full Complete Seal Accessories Each kit contains every sealing component you need for one arm cylinder overhaul, no missing parts, convenient for one‑stop repair.

✅ Exact OEM Size Matching Manufactured strictly according to original cylinder specification, perfect fit for cylinder rod and groove, no trimming required during installation.

✅ Premium Sealing Raw‑Material High‑grade NBR, PU and PTFE sealing material, outstanding hydraulic‑oil corrosion resistance.

✅ High Pressure & Temperature Resistant Stable sealing performance under heavy‑load, high‑pressure and continuous‑operation working conditions.

✅ Excellent Anti‑Leakage Performance Effectively solve internal leakage, external oil seepage, arm dropping and insufficient cylinder power problems.

✅ Long Service Life & Wear‑Resistant Good anti‑friction property, reduce abrasion between seal and cylinder rod, extend overhaul cycle.

✅ 100% Pre‑packing Inspection Every seal kit is checked for part completeness before shipment, ensure zero‑shortage.

🔹Application Scope

Compatible with Hyundai excavator models for arm (stick) cylinder repair: ‑ R290‑9 ‑ R300‑9 ‑ R305‑9 Ideal for hydraulic cylinder maintenance, leakage troubleshooting and cylinder rebuild work on construction sites.

🔹Our Company Advantage

We are a professional supplier of full‑range excavator spare parts. We provide various hydraulic seal kits, piston pumps, hydraulic cylinders, engine parts and undercarriage components for Hyundai, Sany, Komatsu, Cater-pillar,  and other excavator brands. ‑ Large stock of Hyundai excavator seal kits ‑ Factory‑direct competitive price ‑ Fast shipment for in‑stock goods ‑ Support mixed‑order & one‑stop spare‑parts procurement ‑ Professional part‑number matching technical service

🔹Packaging & Shipping ‑

Independent sealed plastic bag + shock‑proof inner box for seal kit ‑ Outer reinforced carton for long‑distance sea‑transport protection ‑ Multiple shipping solutions: sea freight, air freight, express courier for small trial orders ‑ Export documents (Commercial Invoice, Packing List) can be provided.

🔹Contact Us

If you need more boom, arm, bucket cylinder seal kits or overhaul spare‑parts for Hyundai R‑series excavators, please send your parts list to us. We will send you our best quotation promptly