Hitachi 334445 Spare Part - GEAR BOX ASS'Y

Hitachi gear box assembly — part no. 334445

Restore drive and torque in your Hitachi 18 V combi/impact drill with the genuine Hitachi gear box assembly (part no. 334445). This factory-assembled gear unit replaces the internal two-speed transmission that transfers motor power to the 13 mm chuck, eliminating symptoms like gear slip, grinding or loss of drive so your drill returns to smooth, consistent performance.

What’s included and key details: metal gearbox housing with precision steel gears and bearings, pre-assembled selector/gear train ready to drop into the tool, designed to use the drill’s original fasteners and seals. The assembly is built to handle typical jobsite loads and the hammer/torque demands of Hitachi 18 V impact/combi drills.

Example fitment: fits Hitachi / Hikoki DV18DL2 and DV18DSDL series drills (and compatible DV18DBDL/DV18DL variants); intended for the 18 V two‑speed models that use a 13 mm chuck and the factory gearbox arrangement (no‑load speeds and torque ranges match the original drill specification).

Why buy this part: if your drill shows reduced torque, slipping between speeds, or noisy/worn gearing, replacing the gearbox assembly with this genuine Hitachi unit restores original gear ratios and mechanical reliability without machining or modification. This is a direct replacement among common power tool parts for the DV18 family of Hitachi/Hikoki drills.

(Note: this listing describes the gear box assembly as supplied by Hitachi/Hikoki under part number 334445 for the models shown.)