Hitachi excavator accessory 4245797 walking reducer edge cover screw; drain plug

4245797 is a drain plug (PLUG) used on the Final Drive of Hitachi excavators. It is installed on the edge cover of the walking reducer. Mainly used for: discharging gear oil inside the walking reducer, serving as a gear oil level inspection port, sealing the inside of the reducer to prevent gear oil leakage and external impurities from entering. The walking reducer is equipped with a planetary gear mechanism inside, which requires regular replacement of gear oil to maintain good lubrication and heat dissipation. The oil drain plug is a critical component that can be opened during maintenance.