Hey Hugh, Going from memory alone as my books are at the shop.
On the large frame tractors 06,56,66 the front pump powers the TA, P/S, brakes, lube, feeds the oil cooler, Ithink that's all. The rear pump powers the 3pt and remotes.
On the 656, the front pump powers the P/S thru a flow divider and then the remotes. The piggy back pump powers the 3pt and the internal plumbing is such that the rear pump can feed thru a check valve into the remote circuit when the hitch is not being used> Not the other way around because of the check valve.
On the 504, I don't think the hitch pump can feed into the remote circuit but I am not sure.
As far as the semimounted plow, have NO experience. We always used chisel plows and heavy disc harrows around here.
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