Genuine Makita armature / rotor — part no. 619190-4
Bring a stalled rotary hammer back to life with this original Makita armature (rotor) assembly, part 619190-4. It’s the rotating core that carries the commutator and shaft — a direct replacement designed for Makita SDS+ rotary hammers such as the BHR240 and compatible HR240D variants.
Key specifications (metric)
- Overall length: 129 mm.
- Lamination (stack) length: 30 mm; lamination (stack) diameter: 31 mm.
- Commutator diameter: 15 mm.
- Bearing center distance (between bearings): ~86 mm.
- Shaft/drive: 7‑tooth (7‑spline), right‑hand orientation (fits the tool’s original gearbox coupling).
What you’ll get and why it matters
- Complete armature/rotor assembly with commutator and shaft built to Makita’s original specification — replaces a burnt or damaged rotor to restore motor torque and smooth running.
- Ideal when the tool shows heavy sparking at the brushes, loss of speed under load, or a noisy/imbalanced rotor.
Fits (example models)
- Makita BHR240 (18 V SDS+ rotary hammer) and HR240D/HR240 variants commonly listed for this part.
Quick tip
- When replacing the armature, inspect the carbon brushes and bearings and replace them if worn to avoid repeat failures.
(Part identification and dimensions are taken from Makita parts listings and parts diagrams for model BHR240/HR240D.)
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