I have a 6000 commander. That runs great it has a new hydraulic pump up front. I have never had any trouble from the tractor l until the other day and noticed a large amount of hydraulic fluid coming from the rear end housing. I took the floor out of the tractor and found a vent where most of the fluid is coming from. It also has some coming from what looks to be a bolt on the top of the axle housing.What could be causing this problem, and where could the fluid be coming from? I have a service manual, and cant find anything in it that shows me what could be causing this. It does not take long before I don't have power steering or brakes. Any help would be greatly appreciated!!