Genuine Makita 143976-9 — Bearing Box Complete: a factory replacement front bearing housing that supports the spindle/anvil and holds the front bearings and seals as a ready-to-install subassembly, restoring smooth, concentric rotation and proper impact action.
This part is listed as "BEARING BOX COMPLETE" in Makita parts diagrams and fits several Makita brushless impact drivers including DTD154 / DTD170 / DTD171. This is the exact original Makita component shown in the tool breakdowns, so it drops into the front of the tool to eliminate play and front-end noise.
If the front of your impact driver has excessive play, grinding, or uneven bit rotation, replacing the bearing box with part 143976-9 returns proper alignment and reduces wear on the anvil and gears — a simple, direct repair using genuine Makita power tool parts.
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