4355083 Original Excavator O-ring for ZX220W-7

The original O-ring 4355083 is designed specifically for the Hitachi ZX220W-7 (approximately 22 ton class) wheel excavator and is a key static seal at the connection of the hydraulic system pipelines, cylinders, or valve blocks of this model. Its universal number 4355083 is the unique identifier for Hitachi genuine parts, ensuring a perfect match with the dimensional tolerances (such as inner diameter and wire diameter) of the host sealing groove to achieve zero leakage. In addition to ZX220W-7, this sealing ring may also be compatible with ZX220-7, ZX240W-7, and other similar series of equipment with the same hydraulic interface specifications. However, it is strongly recommended to verify the specific model of the host and this universal number when ordering.

This product is a black O-ring with a smooth surface and a prominent green dot mark on the ring body, which usually indicates that it is made of high-quality hydrogenated nitrile rubber (HNBR) or fluororubber (FKM) material. This material has excellent high pressure resistance (up to 30MPa), hydraulic oil resistance, high temperature resistance (-30 ℃ to 150 ℃) and aging resistance. Its precise cross-sectional diameter and inner diameter ensure uniform deformation after installation, effectively filling the micro gaps between metal mating surfaces, forming a reliable sealing barrier, and complying with international sealing standards such as ISO 3601 or JIS B2401.

It is recommended to combine regular maintenance of the equipment every 500 hours of operation to check whether the O-ring has hardened, cracked, permanently deformed, or surface worn (scratched). Once signs of seal failure are found or disassembled for maintenance, it must be immediately replaced with original 4355083 parts. Before installation, it is necessary to thoroughly clean the sealing groove and mating surface, remove old sealant and impurities, and apply an appropriate amount of clean hydraulic oil compatible with the system on the new O-ring to assist in installation. It is strictly prohibited to use sharp tools to forcefully pry it in. When stored, it should be placed in the original factory sealed packaging, away from light, moisture, heat sources, and ozone environment to maintain its material elasticity and sealing performance, thereby extending the maintenance cycle of the hydraulic system.