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I've never converted a garden tractor to power steering, but have considered doing it to a 317 Deere. If you are able to find one, look at a 400 Deere. They have a valve in the drag link that controls oil flow to the steering cylinder mounted on the front axle. That would be one way of doing a conversion, and I have seen some of the parts on ebay from tome to time. Look also at a 430 Deere, if possible. They use a Char-Lynn (I think) steering valve that is part of the steering column, and the oil from that valve feeds the steering cylinder up front. With this sytem, there is no mechanical linkage between the steering wheel and the front wheels. I may be possible to get these components fom a wrecked 430. Is your tractor a hydrostatic? If it is, it may be possible to use the oil supply from the hydro that goes to the hydraulic lift valve. You would feed the power steering sytem from that source, and then feed the lift valve with the return oil from the steering unit (of either type mentioned above). If it is not a hydro, or the hydro is not ported for external hydraulics, a car power steering pump should do nicely. Surplus Center at Omaha, Nebraska has some steering valves of the type mentioned for the 430. They may all be too big, but a call to Surplus Center's tech people should provide more info. Those steering valves are rated as to how much oil they displace for each revolution of the steering wheel, and you use that figure with the bore and stroke of your steering cylinder to arrive at a number of turns "LOCK TO LOCK" of the steering wheel required to go from a full left turn to a full right turn.
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