Original Makita Internal Gear Case Assembly — part no. 135718-5 — a direct replacement listed for Makita DTW1001 and DTW1002 brushless impact wrenches.
This precision die‑cast gear case houses the reduction gears and bearing seats that keep the anvil/hammer train aligned and protected; it’s supplied as a complete internal gear case assembly (the parts diagram shows the included spur gear and O‑ring in the assembly).
Fits Makita high‑torque models with 19 mm drive (DTW1001) and 12.7 mm drive (DTW1002), so it’s the correct replacement when the front housing is cracked, threaded bosses are damaged, or drivetrain alignment is affected.
A genuine Makita part, 135718-5 restores correct fit and gear alignment quickly and is listed in Makita parts — ideal if you need a straightforward replacement to get your impact wrench back in service. Makita parts.
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