Deutz 6806 hydraulics poor after steering redone

[lagarto]

Had this old tractor for a year (all fluids/filters changed then), all went well until steering/ hydraulic cylinder started leaking, had it repaired, back on, steering now works poorly, lift not at all now. bled the steering cylinder, beld steering pump (lots of foam, intermittent spraying), bled the pipe at the main pump but it was full and pushing out fine, no air there. 2 mechanics told me they suggested bleeding at the main pump (did as said) and removing 16 bolt panel under seat, drain the fluid, look for a filter in there to the left and clean it.There is no filter under that panel that I can find unless it is accessable under the outer left side under a female hex bolt, but I looked completely inside this drained area and saw nothing like that. I have the hydraulic manual , which is basically pictures and no explanation. Anyone experienced with these Deutz?