Don't know about the dipstick for hyd fluid on a CK, but on mine, the hole is a little too small. It has a tendency to hold a bubble of fluid at the top which will then cling to dipstick on way out making it look way over full. Easy to think mine has too much in it - just have to make sure there is no fluid right at that opening & read again.
My oil was pretty dark after about 15 hrs, then after 1st change, probably 10 hrs it no longer looked newish at all.
If you're really worried about it, a jug of Rotella from WM & a Wix oil filter from NAPA/O'Reily/wherever isn't much $.
Raise your bucket about halfway, raise the 3pt. Check hyd fluid. Then, with machine still off, ground both & check again. You'll see why you always want to check with machine sitting same way.
Wherever you park the machine at end of day, make that a nice level area. That way you're always doing these checks on a cold machine in the same state. Will be easier to notice if something is changing.
Good luck with the front axle oil.....if yours is anything like mine there is no rhyme or reason to that nearly impossible to read tiny orange plastic dipstick.....any excess will just seep out, so I err to too much there. But sometimes that stick is bone dry, sometimes it says too much. Why its made needing thread in to check is a mystery to me.....