2004 bobcat 331 hydraulic issues-weak to little function

morning guys new to me machine here Bobcat 331 hydraulic issue 3600 hours 2004 model machine appears to have no to minimal hydraulic function (tracks try to turn but will not, blade will only go up or down when a pilot stick is also activated. blade moves better when i try to move a track. it seems when 2 functions are attempted the other hydraulics work better but minimally at best. i am going to pull the pump and check the coupling and then do a system test. anyone have a schematic for the hydraulics? thanks john