I have a Case 1530 in which I would like to drain & replace the hyd fluid. I have located the vent cap on the left side of the uni-loader but have not been able to locate the actual fill port. There is a fill port toward the back which I initially thought was for the hyd fluid but when I took the cap off it smells like gas so I'm not sure. There is another fill spout on the right side of the uni-loader which I have been using as the gas fill port but not sure what the fill port on the left is. I did purchase a set of books for the uni-loader but none of them provide a description of where & how to replace the hyd fluid. I expect that they assume that this is covered in the operator's manual (which I do not have). If someone in the forum has knowledge to share on this issue it would be most welcome.