Description
Overview:
This Genuine Makita Armature Assembly (115 V) is the rotating motor core that drives your angle grinder. Built with copper windings on a laminated steel core and a precision commutator, it restores smooth power delivery and correct motor speed when the original armature is worn or damaged. It is designed specifically for 115 V versions of the Makita GA4550 and GA4550R, ensuring a direct, reliable replacement without modification. Manufactured to Makita standards, OEM No. 517991-3, it withstands continuous use in grinding and cutting tasks where torque, balance, and durability matter. Choose this part to resolve symptoms such as arcing at the brushes, loss of power, or overheating, and to maintain consistent performance from your grinder.
Key Features:
- Genuine Makita part for assured fit and performance (OEM 517991-3)
- 115 V specification for correct operation on 115 V machines; not suitable for 240 V tools
- Copper windings and robust steel laminations for durability under heavy loads
- Accurately balanced rotor to help reduce vibration and improve tool control
- Restores speed, torque, and consistency when cutting or grinding
- Direct replacement for the original armature-no rewiring or alterations required
- Helps minimise downtime with straightforward installation by competent users
- Supports long service life when used with healthy carbon brushes and bearings
Typical Applications:
Replacement armature for maintaining or repairing 115 V Makita angle grinders used in metal fabrication, construction, masonry cutting, site work, and workshop tasks. Suitable for restoring reliable power delivery and smooth running after failures caused by overload, dust ingress, or wear.
Also known as:
Armature rotor, motor rotor, grinder rotor, Makita rotor assembly, GA4550/GA4550R rotor, electric motor armature for angle grinder.
Fits Models:
GA4550, GA4550R
Alternate Part Numbers:
517991-3, 517991 3
Product Specifications
| L&S Part No. | 517991-3 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Makita |
| OEM No. | 517991-3 |
| Unit of Sale | 1 |
| Machine Type | Angle Grinder |
| Fits Brands | Makita |
| Key Features | - Genuine Makita part, OEM No. 517991-3 - Designed for 115 V Makita GA4550, GA4550R - Copper windings on laminated steel core - Direct replacement, no modifications needed - Reduces vibration, improves tool control |
