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I have a 91 F350 4x4 with the 7.5. When I bought the truck, the guy told me the power steering pump was bad. I changed the pump, went through the bleed procedure. Nothing. I hear the pump running. It just has no assist to turning at all. Drained the power steering fluid, tried type F tranny fluid, and still nothing. Even jacked up the front end, tires will turn, but still no assist. It has the vacuum style pump. Any ideas why Im not getting any assist at all?
the high pressure side does the assist. I would pull the lines off and blow them out with a air compressor. if that dont work mix some Marvel Mystery oil with the fluid and let it run for 5 or so minutes then drain and put fresh fluid, If that dont work replace it.
Can't you see fluid circulating in the reservoir?
If a line was blocked (I can't see how, under that pressure ) there would be nothing coming from the return line and the noise from the pump would be unbelievable.
Maybe it's just time for a sector box?
Theres just the normal hum coming from the pump. Cant really tell if the fluid is moving in the resivoir or not. When I get some time, Ill try a new box and see what happens. Just trying to avoid it unless I have to.
If the high side line was plugged the pump,would be squealing like a pig under a gate. Pull the return line and plug the return port on the pump housing just hold the return line over the filler housing run the engine and see if it moves fluid. I have seen new / reman pumps that where bad right out of the box.