My 1978 Intramotor Gloria Scout was making some grinding noises intermittently while riding, usually at higher speed. When I stopped riding, the front wheel hub was very hot to the touch. Hottest in the center but also all the way out to the axel nuts. I'm guessing it's a wheel bearings issue, but could that cause the hub to get so hot?
When stationary, the wheel spins freely and does not make any unusual noise. Front brakes seem okay, maybe a little sticky but nothing major.
The wiki article on Repacking Cup and Cone Bearings is informative, but how do I know if I should replace my bearing cups, cones, and balls vs. just cleaning, re-greasing, and reassembling.