My tc18 ran fine till yesterday when I started loosing power in the hydraulics and HST at the same time after heavier use. Related or not, I also noticed a hydraulic fluid leak that seems to be coming from somewhere under the diesel tank that's dripping on the gear box right behind the starter (yannmar 18hp motor). This morning I ran it and started out fine, but quickly lost power again. First tractor so need help figuring this one out.