Hi Folks I have a well used 743 that I only use occasionally on my property, generally its been pretty good. Its done a lot of work, about 8000 hrs. Yesterday it suddenly pissed hydraulic fluid....everywhere, massive leak. After inspection I have traced it back to the cooler, under the radiator. I wiped things down, briefly ran the engine (~ 5secs) with exhaust and inlet filters removed, and the doors under the cooler. From the back, the LHS coupling appeared to be the leak spot, new fluid all over it and surrounds. There was a lot of crud built up around the end so I assume it may have been leaking slowly for a while. The two pipes were tightly fitted, not loose, and dont appear damaged etc. I have removed the cooler and will give it a good clean up for inspection. Any ideas as to what might have happened ?? Cracked cooler? Hose join leak? Excessive pressure??