Here is the method I used to drive the outer pinion shaft out of the clutch unit:
I'll assume that you have the final drive housing off the tractor and have removed the brake band.
The toughest part of the job was separating the clutch unit from the outer pinion gear shaft. In theory, the clutch unit should slide off the end of that shaft - mine didn't! The clutch is keyed to the shaft with a large woodruff key, and rust had built up where the shaft and clutch join. Needless to say, we had to drive the shaft out of the clutch. Start by removing the cover for the pinion shaft outer bearing.
BTW, the brake drum is an integral part of the clutch unit - they are bolted together. Don't try to separate them while still inside the final drive housing.
We built a tool to drive the shaft out of the clutch - essentially the opposite of a pulling tool. We welded a short length of pipe to a 1/2" piece of flat stock long enough to bridge two of the bolt holes that secure the housing to the rear end, and drilled two holes to line up with the bolt holes. The we cut a piece of round stock to fit between the flat stock at maximum extension from the end of the housing and the end of the outer pinion gear shaft - ie, it fit into the bushing on one end and the piece of pipe on the other. Then we attached the tool with two bolts and put increasing tension on the bolts, whacking the center of the tool every now and then with a BFH. This arrangement drove the pinion gear shaft out of the clutch in about 3 minutes! The outer pinion shaft bearing will come out with the shaft.
There is a downside to this approach: the woodruff key tears a groove in the oil seal that's just outboard of where the shaft and the clutch are joined, so you will need a new seal unless you are lucky enough to be able to separate clutch and shaft by hand. I'd replace the seal anyway.
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