This hydraulic arm cylinder seal kit is aftermarket replacement parts for Hitachi ZAX350H-3 excavator arm (dipper) cylinder.
It includes all necessary rod seals, piston seals, wear rings, backup rings and O-rings to overhaul the arm cylinder. Effectively stop hydraulic oil leakage and recover cylinder power for heavy-duty digging work.
Made from high-grade PU, NBR and PTFE composite materials, excellent wear resistance, high pressure & temperature resistance, long service life for mining, quarry and construction sites.
Precision machined to match OEM specifications, direct fit without modification, fast on-site cylinder overhaul.

✅ Application: Hitachi ZAX350H-3 Excavator
✅ Product Name: Arm (Dipper) Cylinder Seal Repair Kit
✅ Material: PU + NBR + PTFE + Backup Rings
✅ Function: Repair leaking arm hydraulic cylinder, restore cylinder pressure
✅ Features: Anti-leakage, wear-resistant, high pressure resistant, easy installation
✅ Package: Complete full set seals for arm cylinder overhaul