The rear main is a standard lip style seal. The bore that it is seated in is half in the block and half in the main cap. In you are looking at replacing the main bearing without splitting the tractor you can try just dropping the main bearing cap and reinstalling it. If the seal is still in good shape you may get by. On the other hand the seal probably has been in the engine as long as the bearings so there is a chance that it will leak after you are done.
There are also two rubber plugs that are installed between the block and the main cap. You nee a couple of guide pins to locate the rear main when installing and then the plugs are pushed into the holes where the guide pins are used.
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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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