The packing is a normally graphite impregnated rope-like material. It is compressed under the packing nut to seal between the turning impeller shaft and the housing. It is pre-formed and you place it around the shaft. You can buy it from your CaseIH dealer packaged individually. The newer ones are white instead of black but they have worked as well for me. Sometimes several pieces are needed - it depends on the condition of the old packing. Like piston rings, stagger the gaps so a better seal is formed. The nut needs to be snug but not excessively tight. That only causes premature wear of the shaft. Make sure there is enough packing in place to allow for future adjustment of the nut.
On the pin, there are two ways you can find it. From the outside, it is at the transition between the front of the generator pulley and the back half of the water pump drive pulley. It may even appear as a machining burr or even an old paint run. From the inside, remove the seals and bearings and clean it really well with solvent to reveal the other end. This will help you locate it to drive it in from the outside. Note: The hole for the pin is not perpendicular with the hub centerline and I don't remember which way is slopes. Sorry.
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