Replaced PS Pump on 02 Windstar, but still now power steering

The power steering has been acting up on my 02 windstar, so i replaced the power steering pump, but its still stiff and very hard to turn... Anytime in the past whenever i had a ps problem, i'd replace the pump of whatever vehicle and all would be fine.. but not this van... What other component could be the issue that my steering is acting this way..
 
in the begining of it acting up, it would get tight, like the ps would just vanish, than show right back up again, but no longer... it's gone for good..
 
there is no leak, i used a new ps pump, pulley, fluid... you can see the fluid flowing when you look in the resevoir...
 
 
any help would be highlly appreciated..
 
 
 

Could be a dead rack.. Sometimes as they start to go bad, you'll get a 'sleepy rack' where the P/S has high effort cold, or may be in one direction only during R/L turning and then as the fluid heats the rack will work as it should.. Any indication prior to the complete assist failure? how many miles on the van?

93k..
 
 
and yes, it would only do it steering right at first, now it's no bueno either way... R or L...
 
 
possibly have a link to a breakdown of this rack? or a link to some simple instructions.. ?
 
i should be able to replace it but have never done one...

Breakdown 'as in' rack removal? If so i can send you the rack replacement instruction.. I does require that the rear of van's sub frame be lowered a few inches to gain access, and for clearence to get the rack out..