Hydraulic winches specifically for the Fourtrak use the transfer case for their pump, on the rear of the transfer case is an aluminium cover plate shaped something like a bra. This is removed and the pump is simply bolted on in place of the cover, the tank can be placed anywhere within easy range of the pump, but, the oil level should be higher than the pump too prime it.

Aftermarket winches use the power steering pump, the pressure pipe is tee'd into the pressure outlet of the power steering pump, this gives the feed.

Both systems feed a set of valves to control the direction of the winch, simple types use a handle to control the valve directly, other systems rely upon remote solenoids to control the valve.

Both systems have their benefits, but the steering pump type often provide the pressure, but not the flow capacity to operate the winch at its optimum, therefore it will be slower, and not have as much pulling power as it was designed for. Look at the winch manufacturers specifications, this will give a pressure, and flow requirement for the winch to operate correctly. Hydraulic winches are the better system as they give a constant pull, and you do not have to keep stopping to let the motor cool down, and give the battery time to recharge. The only disadvantage is that the engine needs to run to operate the pump.