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A peek
at the original schematic may provide the clues. At least during the GE
production, the motors used in the E-15 and larger tractors have a very heavy
field winding , that possesses few turns, in series with the armature. I'm not
very up on my DC motor theory, but have dim recollections of this type of
winding being used for either speed stabilization, or to cancel the effects of
armature reaction.The placement of it will favor efficient armature rotation in
one direction,and less efficiency in the opposite rotation.
One of the
real EE types on this list will certainly clarify this. :)
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