My old craftsman shop vac started to smell "hot", like the motor was burning
out. I removed the top cap over the motor, and verified that the brushes were
fine. On further inspection, I discovered that there were two wires that had
broken loose from their commutator connection. I carefully heated the wire end
with my soldering iron, then scraped the insulation with a knife, and scraped
the connection point on the commutator, and then soldered them back in place. It
now seems to be working fine. FWIW.
Wish you coulda posted that like a week ago, when my 5-buck metal-can
garage sale Shop Vac let the magic smoke out, just as I started the
quarterly cobweb harvest. I already blew 40 bucks at Menards buying the
replacement. (which, to my pleasant surprise, is backwards-compatible
for accessories and filters, despite being 20? years newer. Good thing,
because I already had a double-length hose, round brush, semi-hepa
filters, etc, from the old one.)
Maybe before I pitch the carcass of the old one, I'll open up the motor
box and see if it was the same problem with mine. A spare can and motor
could come in handy, if I ever need to suck up anything real horrible.
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