Makita 454 heavy-duty lithium electric drill, multiple failure points,
1. The carbon brush is disconnected and the carbon brush is stuck
2. The rotor is broken
3. The stator silicon steel sheet falls apart
4. The switch cap is missing.
The rotor was rewound, new carbon brushes were replaced, the stator was rebonded, the appearance was deeply cleaned, and finally the function was perfectly restored, and the drilling efficiency on the wood was very high.