Original Makita controller 631656-4 — direct replacement control module for Makita HR4001C and HR4011C SDS‑max hammer drills.
This original Makita controller is a 110 V control unit that manages the drill’s electrical/speed functions; the module is compact (approximately 60 × 105 × 60 mm) and lightweight (about 0.26 kg)
Sold as the single controller assembly (631656‑4) for the HR4001C/HR4011C model family, it’s the part you’d use to restore proper electronic control when the existing controller fails or exhibits intermittent speed/power issues. This genuine Makita item appears in official Makita parts breakdowns for those models.
If you’re repairing a hammer drill and need to replace just the control module, this part is listed in Makita parts listings for the HR4001C and HR4011C and is categorized with electrical control power tool parts for those models.
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