I would try to clean/buff/shine up the commutator to remove any oxidation or oil or crud. To test for shorts in the armature place an ohm meter lead on the armature shaft then place the other lead on the commutator segments and there should be an OPEN circuit IE NO shorts. The brushes should be clean with enough length remaining so the hold down springys are pushing them tight to the commutator. An Ohm meter from frame to the input stud should show continuity and extreme LOW resistance. CAUTION when trying to jump with a battery and cables have it tight in a vice cuz it kicks in hard n fast. The bushings have to be in good enough shape so the armature isn't dragging.....It should turn free n smooth by hand and exhibit no burned smells..
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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