Hydraulic question

Ive a 574 IH, with a front end loader, plumbed into the tractors one pump, tractor was in good shape till loaned out, person left parking brake on which lead to the issue at hand.....
I replaced pump, and in the process cleaned out all cavities of debris, transfer screen as well, replaced MCV pump, and put it back together...(MCV, was pulled apart and cleaned as well)
Everything seems to work,but when using loader to lift front of tractor, it will not hold at all...as soon as you release the loader arm, it drops....
any ideas?
 

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