ford 720 loader on a ford 4000 light industrial

Front mounted pump . Is there another filter besides the spin-on up by the controls? How much fluid does this system take...different from rear hydraulics. On the loader the frame itself is the tank
Thanks.Also any idea type of pump looks round not square vane or piston and possible rebuild kit although does not leak a little jerky when cold .. no drift when holding a 250 lb hog up to dress....
thanks Sue

ford 720 loader on a ford 4000 light industrial