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Probably old hat by now, but there is a spacer/sleeve on the crankshaft behind the pulley, and I believe the seal rides on that spacer. There is also an o-ring behind the spacer which prevents oil from leaking out between the shaft and spacer. If this O-ring were to leak the oil would appear to be coming out from the shaft behind the pulley, or even from the nut side of the pulley. You will want to rule that out first, or just replace the O-ring with the seal to be sure.
It is theoretically possible to pull out the spacer without removing the cover, but you would have to get a grip on it without marring the surface on which the seal rides. The spacer is not all that tight and could probably be removed with just fingers. The pulley is tight and you will need a 2 bolt puller with the right metric bolts. there is a keyway in the pulley but not the spacer.
In fact, with the right hooks, and with the spacer removed, you could probably pull the seal without removing the cover.
If you pull the cover, its the governor springs you have to worry about. if you don't watch it you will stretch them and then have all kinds of problems getting the rpm to be stable. You can access both springs before the cover is lose, but its hard to unhook them. I think one accessible from the side cover plate below the injector pump and the other by removing the stop lever assembly from the top of the cover. Its even harder to hook the springs back up, and I have had better luck connecting at least one spring while the cover is not quite on yet.
The cover has a coolant passage or two around the water pump, so be sure to clean the old gasket off uniformly everywhere and check the surface near the coolant passages. they could be rather narrow from corrosion. a water leak there will not be immediately evident and would result in water in your crank case.
All the parts are Kubota, so you can get them at a tractor place online. 5432 might be the V1501 engine (L345?) but look it up because that is only a vague memory.
Disclaimer: I usually can't remember what I had for breakfast, so all of his may be wrong. In any case, start with the pulley and have a good look before you pull the case.
Also, how is your oil pressure? If the front seal is bad it might be because the front bearing is bad and the shaft is vibrating. Anyway, hope this helps someone BEFORE they re-power.