Genuine Makita 221437-0 — Spur Gear 17 (17-tooth) replacement: precision 17-tooth spur gear designed for the gearbox/geartrain in several Makita impact drivers and impact wrenches; it meshes with the internal gear (part 227316-0) and is shown as a factory part in Makita parts diagrams.
Fits models such as DTW180 / DTW181 impact wrenches, DTD155 and TD111D impact drivers — check your tool’s parts breakdown for the same part number to confirm fit.
Typical gearbox usage calls for two of these 17‑tooth spur gears in the assembly (Sold Single), so inspect both gears during repair and replace any worn mates for reliable meshing.
If you work with Makita parts, this genuine Makita 221437-0 is the exact factory callout for the applications above and slips straight into the original geartrain without modification.
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