I have two Gravely 260Z mowers. The owners manuel is not clear to me how to properly check the hydraulic fluid. The book doesent say weather dip stick should be screwed all the way in or just set on top of the fill tube to check it as it makes over 3/4" differance. I know on some engines they tell you to screw the dip stick in and others say not to screw it in. With all the 4 cycle motors I have, 3 generators, UTV, 4 mowers etc. I wish they would post it on the dip stick. Its hard to keep track of all them and worse when you have some one else check it for you.