(ET) Another mower motor blows.

[Chris Zach <cz alembic crystel com>]

Well, had the usual deck motor failure. This seems to happen every other 
year or so with tall thin motors:

Mows fine one weekend.
Start mower next weekend, tractor pulls huge amount of current. Blade is 
stopped.

Blade free-wheels, wiring to motor is smoked.

Take motor top off, commutator is burned, and armature is obviously 
shorted. Motor destroyed.

Any idea why this happens? The inside of the motor was dry, no problems, 
plenty of brush. It's as if the laminates just decide to fail and burn 
everything up.

Now to buy some more motors, my supply is low. This never happens to fat 
motors, they just have the magnets deglue and shatter all along the 
inside. Once again no reason, is there a glue that will hold them?

C