Once the pump is pushing fluid, it does not take all that many pumps to make anything move if things are working right.
again, this could be as simple as the hoses are connected backwards on one of the pumps…
that is a good idea to confirm pump operation, connect a cylinder directly to the hand pump output port.
You could raise the cab this way, by connecting the output line from the hand pump to the port on the frame rail that feeds the base end of the cab cylinder and the cab latch. It is on the frame rail near the front of the fuel tank…
unfortunately lowering the cab afterwards is the advanced class and will be a little messy as you would then have to loosen a fitting(BUT NOT REMOVE IT) enough to allow fluid to leak out slow enough to not trip the cab safety with too much flow. Once the fitting is loose, you must push the cab back over the balance point and it will come down as the fluid leaks out of that loosened fitting.
How loose does the fitting need to be? good question. I guess you could learn this by lifting the cab a few inches with the hand pump then loosen the output fitting on the pump to let the fluid leak out and practice lowering the cab that way till you get a feel for what is needed… You will need something under the pump to catch the fluid… Messy but it would work.