What can a blocked case drain cause s250

[burrell creek s250]

Hi all. I purchased a new hi Mac Australian slasher. It is set to run off low flow. It has case drain hose and worked perfectly. More on that later. Upon first use I noticed hydraulic oil on left and right of machine on ledge below fan vents on s250. It was not huge amounts and when I ran machine without attachment couid not see any evidence. Could a blocked case drain filter cause this . There is no oil below cab. I have not checked case drain filter as yet. Perhaps a seal in fan allowing hydro oil through. I am not a mechanic so any ideas appreciated. Did not appear as I lost much oil according to float in hydro guage.

 

[mocus250]

check the gearbox for the cooling fan. it high behind the seat back up kinda high

 

[mocus250]

you've probably figured it out by now, but Another thought is to check the hydraulic oil radiator lines. They too are up high behind cab. If its a Duetz powered machine, there are oil cooler lines for engine up there too.