Your welcome, the picture is of my dog Joey, a Husky Chow mix and a smart sucker too.
On a closed center system such as yours you can normally hear the hydraulic pump kick in and out of stroke when idling. By that I mean that raising an implement the pump clatter will increase somewhat and the noise will dissipate when the hitch stops moving. Or does your pump continuously clatter loudly without any let up? Also does the 3pt hitch work properly when the tractor is warmed up?