Yup , center bearing. IH tractors use very similar starter,(along with a lot of other machines) and some have center bearings and some don't. The smaller tractors like a Farmall C did not use one and I have seen starters on H Farmalls that did not. Some times the drive end housing is machined and holes with tapped threads for the bearing, and some are not. I installed a lot of them over the years and it really helps those 6 volt grunting starters. When you throw the juice to that starter the magnetic fields push and pull that armature toward the pole shoes. If the armature touch's or even gets closer it affects the torque delivered by starter. I have been around a few WC's and know they never had an extra lively starter either so I think a center bearing would be good for that starter. Also, a lot of the commentator end frames do not have replaceable bushings in them and a center bearing will support that armature much better even if that end is worn. Those end frames are expensive to replace if worn and no bushings in them.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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