I finally found the answer to my problem.

These past couple of years been trying to fix a Hydraulic vales and system on an old IH. skid steer loader. After taking it to the master dealership mechanics hoping they would go threw it and fix it threw the years (which they did not do). Posting and asking for help on this hydraulic valve base and in yet no body really helped me out. Only Yesterday Tractor board gave me some ideal what I was going for. the problem is finally has been solved. When the person who owned it last before going to the salvage yard with it should had taken the long sleeve port diverter out of the Valve controller unit. This takes that out let and changes all that fluid to flow to the back to additional spool. When they kept the back attachments they should had pulled this sleeve out. Then should had put the short plug back in to the valve body unit. This the would plug that port and then take away that hose that ran to the back which leaked all the fluid in the skid steer. Who would had ever thought of this.
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Not certain what your problem is or was. What you are saying is the valve was set up as a power beyond valve and you not have it back to a standard valve. It would seem that removing the rear attachment as you call it and plugging the lines would work but if they removed the attachments and just coupled the hoses and let the valve have open flow you would have problems. Anyway glad you found your problem. I stil want to come to the valey and look you up one of these days .
 
I had a similar problem with my 400. They took the power steering motor off the tractor and put it on a different tractor. They left a plug in a passage and none of the valves worked.
 

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