I guess you could say that some pumps are "bi-sezual". They can go either way. This would apply to gear pumps. Not sure about vane or piston pumps. The Prince pump is a gear pump.
On a Super A and any other tractor not using planetary hubs, the bull gears are the final reduction. You would need a large displacement motor to get the slow speeds when the motor is on the same axis as the center of the gear.
My 400 creeper drive is rotating the pinion gear which is about 25% of the diameter of the bull gear.
I will be drawing Hy-Tran from the rear frame. It holds fifteen gallons. It is unlikely I will ever overheat the fluid. The Hy-Tran will shed its acquired heat through the rear frame and center section.
You could engineer the system that you described. You will need to know the cubic inch displacement of both the pump and motor. You will also need to know the pump RPM and the desired wheel RPM. On top of that, foot-pounds of torque for both units have to be known. Engineering considerations that may be difficult to estimate are the energy losses that heat the oil.
To be honest, I did not do the calculations on the 400. I have at least four pumps that I can substitute. I started with the smallest. The Prince pump/motor was a given design factor due to its splined bore. See my previous thread from yesterday.
IH made a Hydro-Creeper for the Super A. The tractor's hydraulic system output was sent to a small motor that delivered power to a reduction gearbox that slid over the PTO shaft. The operator would lock open the engine clutch, select first gear, and send hydraulic power to the Hydro Creeper. These unit were used with transplanters. I think I have a picture. I will post it later after I upload it to Photobucket.
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