(ET) Overhaul

[Chris Zach <czach computer org>]

After thinking about waiting a week for a new motor I decided to try and 
overhaul this one. So I pulled it apart.

The brushes are about 30% gone; no real problem there. However the wires 
in the motor were toast near the brush assembly, and the overtemp 
breaker in there was welded closed. I would guess the PO overloaded it, 
then really overloaded it when the contacts welded.

The commutators were filthy, so I hit them with brake cleaner (the 
universal cleaner o' crud) and cleaned out the spaces between the 
commutator bars. Should work a lot better if it works at all.

It's possible the problem is that the common wire was shorting against 
the field coils; the wire was pretty badly burned. So I clipped it down, 
soldered a new wire to the coils and to the common and covered the joint 
with thermal shrink tubing. No shorts at this point; I'll wire up the 
rest of the show tomorrow morning.

If this totally doesn't work, then it's a shorted half of the field 
coil. Maybe I can re-wire it to allow reverse, will have to think about 
that.

Chris