The power steering and hydraulic pump are one and the same There is a priority valve on the hydraulic pump that determines the amount of pressure going to the steering system. The pressure hose going from the pump to the steering gear should have a Tee in line. Remove the cap and install a pressure gauge. The pressure should be about 900 PSI at full steering lock. If it is lower you will have to remove the counterweight to get access to the pump so you can adjust the pressure.
To access the wheel cylinders remove all of the nuts holding the drive wheel on and hit the steel on the inside of the drive tire to loosen up the cones around the wheel studs, then remove the tire.