Repairing Angle Grinders

A local fabrication shop gave me a literal trunk-full of broken tools. In the pile were these 8 Makita 9005B angle grinders. Some of the issues are obvious but I'll be troubleshooting and testing to determine why they all failed. See links below for the parts and tools I used:

Mobil Polyrex EM Electric Motor Bearing Grease:
https://amzn.to/3NitdFl (affiliate*)

Makita Carbon Brushes (CB-124):
https://amzn.to/4bSZlsL (affiliate*)

Makita Stator / Field Coil (520085-5):
https://amzn.to/4dDgLLh (affiliate*)
-OR
https://www.ebay.com/itm/196363994392

Makita Side Grip (152492-0):
https://amzn.to/3K2p9ql (affiliate*)

Mini Bearing Puller & Bearing Separator Kit:
https://amzn.to/3R66KwT (affiliate*)

Ring Terminals:
https://amzn.to/3UXIXkS (affiliate*)
-AND
https://amzn.to/4aj0hoZ (affiliate*)

*Purchasing from these Amazon affiliate links earns my channel a small commission. Think of it as a tip that doesn't cost you anything. Thanks for the support!

Видео Repairing Angle Grinders канала Mike attempts