Here we go again......
I've been running a PTO powered hydraulic winch since 1989. Controlling it is not a problem. Transfer case in neutral, auto transmission in drive, engine running about 1500.
I use the hydraulic valve down by the side of my driver's seat to go forward, backward(pull) or neutral. The pump is rated to put out 20GPM@1500PSI at 1500rpm.
I kept it simple, but I could have gotten fancy and had a speed control on the winch.
The pump is larger than I really need, but when I was designing the system, I did not know as much about hydraulics as I should have, so I just went overkill.
When I asked the guy I bought the winch from about the size of the tank, he told me without a big cooler, it needed to have a gallon per GPM for continuous duty.
That way, any given part of the oil had time to sit in the tank and lose some heat before being used again.
I went with a custom built 30 gallon tank that sits under my toolbox.
Which is the reason my winch is not operable now for the first time in 27 years. It seems that the tank has gotten a hole rusted in it on the bottom. I will pull the tool box and the tank after Turkey season and either get a new bottom welded on, or a new tank built.
Had I gone with a standard off the shelf tank, I could have just swapped it out by now.
I always wanted a belt driven PTO pump so that I could back the truck up with the winch in gear without turning off the PTO. And found some places that sell kits.
But the capacity is not what I like, and it is a much more complex system. I'm happy with what I have. Its pulled out everything I ever hooked it to.
Once you get the pump, PTO adapter, and tank figured out, your options are fairly unlimited. With the proper hoses and valves, you can have front and rear winches, a dump bed, lift gate, even jacks on all four wheels if you wanted to get crazy enough.
Run a couple of remote disconnects, and you could have a log splitter on a trailer that was powered by your truck.
Here is a link to some info about my setup.
https://ck5.com/forums/threads/hydraulic-pto-winch-pics.249796/