Re: big wheel and hydraulic steering
it's mechanical advantage, if the pump is sized to move the ram a greater distance per rotation it will be harder to turn the pump. The larger wheel will make it easier to turn the pump.
Some pumps have an adjustment knob underneath that changes the angle of the swash plate, thereby changing the volume of the pump per rotation. If you have this try turning the knob one way or the other and see how it feels.