Hitachi 321-640 Spare Part - Fan

Genuine Hitachi cooling fan — part 321-640 — a direct replacement impeller for Hitachi/Hikoki rotary hammers. This compact cooling fan is an original Hitachi component designed to restore proper airflow over the armature and bearings, helping stop overheating and reduce premature wear during heavy use.

Made to the same fit and form as the factory unit, the part is supplied as a single molded fan (easy to install where the original mounts to the motor/armature shaft) and is recommended when the existing fan is cracked, missing blades or badly worn. This item is listed in the DH40MRY parts breakdown and shown as the fan for that model.

Fits / compatible models (as listed by Hitachi parts diagrams): DH40MRY (rotary hammer) — also referenced alongside H45MR in Hitachi/Hikoki parts listings. If you need a reliable original Hitachi replacement to get your tool back to working order, this is the matching part you want on hand. Hitachi spare parts are intended to match factory tolerances and mounting points.