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 - Oliver 550 Purchaser Checklist - by Greg Sheppard. Pound for pound the 550 is better than anything I've seen. It has great power for its size and can really hunker down and lug. Classified as a 3-bottom plow depending on soil conditions. I personally don't think it can be beat for a utility tractor in the 40 HP range. They are extremely thrifty on fuel, at least my DSL is. Most drive train parts are fairly easy to get. Sheet metal is probably the hardest thing to
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