Original Makita helical gear — part no. 226589-2 (Helical Gear 37). Precision-cut helical gear for the gearbox of Makita hammer/impact drills: it replaces worn or chipped gear teeth and restores the correct gear mesh and smooth operation in the transmission assembly. The part is listed on the Makita parts diagram as "HELICAL GEAR 37" and is the direct-fit gear used in the gearbox assembly of the older HP-series hammer drills.
Fits (examples): HP1630, HP1631 and MT814 / MT815, M8100 / M8101. Use this part when the internal gearbox shows stripped or missing teeth, grinding under load, or excessive play.
Notes and specifics: Makita lists this as item "Helical Gear 37". If your drill’s gearbox shows a 37-designation gear, this original Makita gear will restore the intended tooth profile and fit.
What you’re getting: an original Makita replacement helical gear manufactured to the same profile used in the factory gearbox assembly — ready to drop into the gear train to stop skipping teeth, eliminate noise from a damaged gear, and return the tool to proper mechanical function.
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