So earlier this week I thought I fried one of my NTM 270s. It got so hot that it almost burned my hand and was making this subtle clicking noise while running. So I benched my board and found that the can was slipping back and forth and thought the bearings were toast or something. That was when I found this grub screw:
You can see it there lurking just between the can spokes on the far right of the motor, covered in dirt and contempt. It was loose, and it was causing basically all of the problems. I tightened it up and reassembled my board and took it out for a spin this morning. No more over heating or funny business.
I guess that after loosening that grub screw you’re supposed to be able to drop the can off the shaft to clean the stators? Maybe I’ll take a closer look sometime.
Hopefully this will help somebody out who’s having the same issue.