It is very important that you DO NOT simply cap off the hydraulic lines going in and coming out of your pump (unless you don't want the pump anymore).
One line (usually the larger one) is the suction line coming from the oil reservoir, the other one is the pressure line coming out from the pump and usually goes to the control valve (usually 1 or 2 handles to control the loader). From the valve block there is a line that returns to the oil reservoir. This completes the circuit and allows oil to circulate from the tank to the pump to the valve and back to the tank.
If the valves are going to stay with the tractor, your best bet is to simply cap the lines going out from the control valve block. This prevents oil from getting out if you happen to move one of the levers. It is important to keep the pump suction and outlet lines connected to the tank and valve block.
The tank might be built into the loader frame, so if the loader frame comes off, the tank comes with. In this case, I would suggest taking the drive belt off the pump so it's not spinning. Spinning the pump without a supply of oil will wreck it for sure.
Hope this helps. If you have any more questions, just email me and I will try to help.