Traveling down hill with anything in the loader bucket, make sure you are in 4 wheel drive. (Off pavement)
Your new tractor has brakes on the rear axle only.
I also thought it would be good for hay.
But, I don’t anything about hay, except it’s expensive at the big box stores.
The owner also lives out of state.
I took the entire valve kit to the shop.
It was easier to let them disassemble it and not worry about leaks.
R&R the valve is not too bad.
I was proud of myself for not having
left over parts or unused hoses.
I would suggest removing the spool valves and take it to your local hydraulic shop for testing.
Three years ago they were $3700 at Kubota.
Both times I had this problem it was the spool valve.
Why do you have to get off your tractor?
I have owned 3 Kubotas, at different times, with Quarter Inching position control, but didn’t dismount to readjust bush hog after turning.