Bosch 4000 arbor won't spin

[908525]

My saw suddenly stopped working partially through ripping a 2x4. The motor hums and the blade will spin just slightly(like a 1/2" at a time) when turned on. The arbor won't turn under finger pressure.
I haven't found this specific issue in the forum and am in the process of disassembly which may reveal the problem but if anyone has some insight it would be greatly appreciated. Thank you.

[gettes]

It was the bearing on the field side of the armature. It is frozen up solid with a bulge on the side. My new question is do I need to disassemble everything on the blade side to get the armature out? I was going to replace both bearings while I had it apart. Thanks in advance for any help.

[Tinkerdave]

Hi gettes,No you should just be able to take the brushes out and remove the four screws that hold the motor housing to the front bearing housing and slide the housing off the armature. You really don't need to replace the larger front armature bearing as this almost never goes bad.Make sure your blowing the motor out with compressed are on a regular bases as this keeps saw dust from clogging the cooling vent in the rear of the housing. Hope that helps.Good luck.
Tinker