Of course there is a big difference between the 3010/4010 and the 3020/4020 PTO"s on the 10"s it requires splitting the tractor and removing the speed gears and shift pins (I just finished locking a 4010 into 540 only),,on the 20"s you can swap the stub shaft o-ring quickly with out loosing much oil, but to change the shaft seal draining the oil is a must, unless you can hang it up by the draw bar. If you wipe the seal area clean and let the PTO run a bit you will be able to see which place the oil is coming from,,My guess is the outer area, which would be the "seal" and not the stub shaft o-ring,,and yes you will probably need a "ready sleeve" to make the repair last, the seal area will be worn badly from all the dirt and grit that has been packing in there over the years.
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