Hitachi Oil Seal (a) - 313-050
Genuine Hitachi part 313050 — Oil Seal (A). Precision replacement oil seal used in the gear/hammer section of Hitachi/Hikoki rotary hammers to stop grease and oil leaking from the slip‑clutch / gear area; the parts lists show it as a single seal (quantity 1) for those assemblies.
Example models (listed in Hitachi/Hikoki parts diagrams): DH38YE2, DH38YE3 , DH38MS , DH40MR, DH40MRY, DH40MEY and DH45MR. These are original Hitachi fitments shown on the model parts diagrams.
What you’re getting: the exact Hitachi 313050 oil seal specified for the gearbox/second‑gear area — a direct, like‑for‑like replacement to restore sealing performance on your rotary hammer. Ideal when replacing worn seals as part of basic repairs using genuine Hitachi power tool parts.
Compatible models this part will fit:
