I am guessing they had a front mounted snow blower that ran off the front PTO at some point?That appears to have the same loader as my "77" B7100.,
The difference being ..mine runs off a seperate crank mounted pump.
Yours looks like it had something mounted on front bumper area at one time.
I'd rather that mine ran off the tractors pump vs this bumper mounted thing.
Is there a reason some used a seperate pump?
perhaps some were factory installed loaders and others installed by dealers?
Where do the lines that power the loader attatch to Your Tractor?
Not sure but it looks like a clean professional install. The loader's right upright/ vertical pillar just after the hydro controls is the reservoir. So the pump runs off a v-belt to the crank& fan pulley -> hydro out to the control valve -> individual cylinders <- back to the control valve -> reservoir -> low pressure return line to the pump.
The loader doesn't share any hydro with the trans, separate pump on the right side of the engine just behind the exhaust manifold.