4116290 Original Excavator Hydraulic Retaining ring for ZX350-7

The original hydraulic retaining ring 4116290 is a key hydraulic system fixing component for the Hitachi ZX350-7 (approximately 35 ton class) crawler excavator. This retaining ring is designed specifically for the Kawasaki hydraulic system of ZX350-7, mainly used at the end of the stick cylinder piston rod to fix the sealing component or piston guide ring, preventing internal component displacement from causing oil leakage. The compatible models include ZX350-7, ZX360-7, ZX380-7 and other similar series excavators. The common number can refer to page E1783 of the Komatsu standard parts catalog (such as KOMATSU standard parts), but to ensure compatibility and reliability, it is recommended to prioritize ordering and replacing with Hitachi original part number 4116290.

This product is of the shaft retaining ring type, made of high-strength spring steel (such as SUS304 or alloy steel) precision stamped and formed, with an outer diameter specification of Φ 45mm, and designed with a double hole positioning structure for easy installation using specialized snap spring pliers. The surface has undergone black nitriding treatment, resulting in high hardness, strong wear resistance, and excellent anti-corrosion performance. It can work stably for a long time in hydraulic oil media and harsh working conditions. Its C-shaped opening design can provide uniform radial clamping force, effectively locking the end components of the piston rod and preventing seal displacement. As an original component, its dimensional tolerances and mechanical properties have been rigorously tested, making it a core safety component to ensure the sealing of the ZX350-7 hydraulic cylinder and reduce unplanned shutdowns.

In daily maintenance, it is recommended to check whether the retaining ring has cracks, deformations, weakened elasticity, or surface corrosion every 500 hours of work or during hydraulic system maintenance. If any abnormalities are found, they must be immediately replaced with original 4116290 parts. It is strictly prohibited to use substitutes that do not match the size or material. Thoroughly clean the piston rod slot before installation to ensure there are no impurities; During installation, use specialized snap pliers to smoothly press the retaining ring into the groove bottom, ensuring that it is fully engaged and not lifted. Long term storage should be placed in a dry environment to avoid collisions and maintain its geometric accuracy and performance. Regularly lubricating the hydraulic system and keeping the oil clean can indirectly extend the service life of the retaining ring.