Genuine Makita Field Assembly 110V (stator) — part number 628941-4. This is the original Makita replacement field winding used in the motor of the HM1810 demolition/rotary hammer. It restores the stationary coil pack that the armature spins inside, so it’s the correct part when a tool shows reduced power, heavy sparking at the commutator, or overheating caused by a damaged or shorted winding.
Key details: the unit is the 110 V field assembly specified for the HM1810; it’s built with tightly wound copper coils on a laminated steel core and insulated for heat resistance to handle heavy-duty hammering and extended jobsite use. It’s a direct-fit replacement designed to drop into the HM1810 motor housing and line up with the original brush holders and bearings.
Why this part matters: replacing a failed field assembly returns correct magnetic flux and torque output so the hammer regains full impact energy and smooth running under load — a straightforward repair choice when the motor winding itself is the failure point rather than brushes, armature, or gearbox.
If your tool is a Makita HM1810 and it runs on 110 V, this original Makita 628941-4 field assembly is the specific replacement you’ll want to restore motor performance.
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