Genuine Makita part 227316-0 — "Internal Gear 43". Precision internal ring gear that installs in the tool’s gearbox/bearing box and meshes with the spur/planet gears to restore proper drivetrain engagement and hammer/impact action. It’s supplied as the single replacement internal gear shown in Makita’s exploded diagrams, so you get a direct-fit, original Makita component that drops into the factory gear train without modification. This part is used on a number of compact impact drivers and impact wrenches — examples include DTD157, DTW180, DTW181, TW161 , TW160DZ and TD111D. This genuine Makita item is listed in Makita spare parts documentation under part number 227316-0 and is the correct replacement when the internal ring gear in the bearing/gearbox shows wear, broken teeth, or causes slipping/noisy operation.
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