No problem with what you said, John. I really wanted to reinforce the message to talk to someone who knows that tractor before spending the money. I did a DTAC search on the issue and was surprised to see such a blunt message saying "don't do it". Usually, the message is more like "we don't recommend it, but if you really insist, here's what you have to do".

My recollection on this issue (goes back at least a dozen years, and was different brands to boot), was there definitely would be a time when the fan motor would slow down or stop. I'm thinking about when you lower the planter and markers, there would be very minimal pressure required, so the oil would go through that valve before the motor valve.

If the tractor has the right valves, an open centre system can work running a motor and lift cylinders at the same time, but I don't think this tractor does.