Power steering issue.

have you rechecked that filter screen again?

my best guess would be more paint is clogging it.

how did you bleed the system? did you lift the truck off the ground, with the engine running, and turn the wheel lock to lock several times?

are you sure that ATF fluid is recommended by KW, and not specific power steering fluid?

 

KW is typically ATF.

Wondering if you've got some contamination blocking off the ports in the power steering box?

 

www.straightlinesteering.com/Troubleshooting%20Guide%20info.htm#Highsteering

Give them a call, they rebuild steering gearboxes, they may be able to help you.

They rebuilt my gearbox last April and I haven't had any issues with it.

 

there is a way to reverse flush, but you need some sort of machine to do that, as you would never be able to build up pressure by yourself.

what you can try to do is (you will need a wet vac for this), is to drain out all the fluid (save what you can), and using a wet vac, attach it to one end of a hose and suck it out. do this for all the hoses you have, that you can easily disconnect.

you may (i would think) be able to use the blower side of that vac and push out fluid as well from the pump and hoses.

i'd not recommend an air hose such as from a shop air compressor, that may be too much air being forced into the system, and may blow things left and right, damaging many things as well. a shop vac has power, but not as much as 90 psi out of an air hose.

a power flush would be cleaner and faster, ans safer

maybe an oil change shop, that does ATF flushes can be of some help.

other than all of this, then a trip to a truck repair shop would be your best bet.

 

You can't test the steering pump free flowing like that, it's not a valid test. You need to load it or dead head the pump to relief pressure to make sure it is capable of the pressure and flow needed based on demand. Only do this with the proper equipment for your safety. You need a pressure and flow meter with a shutoff In line that is rated for say 5000psi.

I would say you likely have a floaty or an object blocking flow somewhere in a line or fitting. Have you replaced all the hose assemblies yet? Check all the fittings at the pump and gear too. Make sure all the openings and ports are clear where every line attaches .This is where items will get cought. I have also seen hoses collapse inside especially at bends.