Description
Overview:
This Genuine Makita Armature Assembly (MPN 513791-9) is the rotating core of the electric motor that drives your hammer drill. Built around a hardened steel shaft with a laminated steel core, copper windings, a precision-machined commutator, and an integrated cooling fan, it restores smooth power delivery and reduces sparking when your old armature is worn. Designed for Makita hammer drills, it offers an exact fit and factory-level performance in 110 V machines. Ideal for keeping your Makita HM0870C or HM0871C working at its best, it helps maintain reliable drilling and chiselling under constant load. As a Genuine Part, it matches original tolerances for balance, alignment, and electrical performance, supporting long service life when paired with correct brushes and bearings.
Key Features:
- Genuine Makita OEM part for assured fit and performance (MPN 513791-9)
- Correct specification for 110 V tools used on site transformers
- Precision-balanced rotor minimises vibration and brush wear
- High-grade copper windings and laminated core for durability under load
- Varnish-insulated windings for heat and abrasion resistance
- Restores torque, speed stability, and consistent hammering action
- Direct replacement to reduce downtime; straightforward to fit with basic tools
- Compatible with original Makita bearings and carbon brushes (check condition when replacing)
- Helps prevent overheating, excessive arcing, and loss of power from a worn armature
- Genuine Part labelling supports accurate identification and service manual referencing
Typical Applications:
For replacing a failed or sparking armature in Makita demolition and hammer drills used for chasing, anchor drilling, light breaking, renovation, and construction tasks. Suitable when experiencing reduced power, burning smell, or visible commutator wear, restoring dependable on-site performance.
Also known as:
Armature rotor, motor armature, rotor pack, commutator rotor, rotating core, drill motor rotor.
Fits Models:
HM0870C, HM0871C, HMJ0870, HMJ0871C
Alternate Part Numbers:
5137919
