Genuine Makita 631729-3 — electronic controller (speed / regulator) assembly for restoring the electrical control of a compatible Makita saw. This replacement module is listed in Makita service diagrams for the SP6000 165 mm plunge-cut circular saw and is also shown as fitting the CA5000 / SP6000 groove cutter.
The part is the internal control PCB / motor-regulator assembly used in the tool’s handle/cord area (mounted as the factory controller), and it restores electronic on/off and variable-speed behavior when the original controller has failed. This genuine Makita item appears in Makita parts listings for those models.
If your SP6000 or CA5000 is losing speed control, cutting out, or won’t power up reliably, swapping in 631729-3 replaces the tool’s original control electronics and gets the saw back to normal operation. This is a direct, model-referenced repair part for Makita parts users who need reliable parts for power tools.
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