The picture I posted was a manual steering box, not a PS steering box. Toyota's use ATF instead of power steering fluid, which is basically the same thing; it is a hydraulic type fluid. For some reason Power Steering, fluid may make the power steering on a Toyota start leaking at the seals on both the pump and box, but it does not always do it.
Toyota power steering boxes are lubed by the ATF, not gear oil. If the system is full and bled, the steering box is full of fluid (ATF). Air does and will be trapped in the PS box and needs to be bled. The way you do that is to loosen the adjusting nut 3-4 turns, move the washer up under the nut to the nut (the washer has a built in O-ring on the inside hole), start the engine and let it run until the bubbles stop coming out around the threads of the stud. While it is still running, tighten the nut and washer down to the box housing, hold the stud in place with a screwdriver. Some years of the IFS steering boxes have a bleeder nipple like the brakes have. My 90 had one.
