Sure you can add another pump, you'll need to get one that has the correct rotation direction to match the rotation of the engine. You will need to make a bracket to mount the pump and a tank, you'll need to make up hoses or hard lines to connect the pump to the tank and to your loader valve. I'm not sure what this will buy you in the end versus what it will cost but you can be the judge of that. I actually did this to my old Simplicity Sovern garden tractor. I added a pump, tank and valves to operate a FEL, BH, and 3-point hitch I made for it.