YA00006597PS Genuine Hitachi hydraulic cylinder seal kit for Hitachi excavator ZX330LC-5G

Part number YA00006597PS is a dedicated overhaul repair kit for the arm cylinder of Hitachi ZX330LC-5G/ZX330-5G excavators. It is compatible with models with the same arm cylinder like ZX330-5G/ZX330LC-5G and ZX350-5G/ZX360-5G. It fits the arm cylinder with a bore diameter of 170mm and a rod diameter of 115mm, a rated working pressure of 31.5MPa, and is suitable for the hydraulic system of the Isuzu 6HK1 engine. Made of a combination of NBR nitrile rubber (oil - resistant, temperature - resistant from - 30℃ to 120℃) and FKM fluororubber (high - pressure resistant, chemical - resistant, suitable for high - pressure oil circuits), the kit includes 80-100 seals such as main oil seals, piston seals, dust rings, O - rings, wear rings and buffer rings, covering key parts like the cylinder barrel, piston, piston rod and end cover, preventing internal and external leakage and ensuring stable arm movement.

Its core function is to carry out overhaul and seal renovation of the arm cylinder. The main oil seal adopts a double - lip structure (oil - proof and dust - proof), the piston seal uses a combined seal (two - way sealing to prevent high - pressure internal leakage), the wear ring reduces the wear between the piston and the cylinder barrel, and the buffer ring reduces the reversing impact. All seals have a dimensional accuracy of ±0.05mm, a hardness of 70±5 Shore A and a tensile strength of ≥18MPa. They are suitable for working conditions with heavy dust, vibration and large temperature differences, with an operating temperature of - 40℃ to 120℃ and an average service life of ≥8000 hours. They can effectively prevent failures such as oil leakage, slow movement and pressure loss of the arm cylinder, ensuring the efficiency of the hydraulic system and the operating performance of the arm.

Before replacement, release the pressure of the hydraulic system. When disassembling the oil cylinder, remove the oil pipes and fixing bolts in accordance with specifications (torque 8-12N·m), and clean the surfaces of the cylinder barrel, piston and piston rod (free of burrs, scratches and oil stains). When installing, apply special hydraulic oil to the seals (do not use grease), install the main oil seal, dust ring, piston seal, wear ring, etc. in sequence, and tighten the end cover bolts symmetrically (torque 10-14N·m). After installation, conduct a pressure test at 31.5MPa (no leakage) and test the flexibility of the arm movement. This repair kit can reduce the leakage failure rate of the arm cylinder by more than 90%, reduce hydraulic oil loss by 40%, increase the response speed of the arm movement by 15%, extend the service life of the oil cylinder and hydraulic components, and reduce maintenance costs and downtime.