Had this issue with a brand new dk45se. On this particular tractor, after removing the operators seat you can unbolt the MLS and pull it right out. Whole thing is about the size of a beer can, maybe a bit bigger. There is a needle valve held down by a spring, you can see it clearly on the side of the MLS valve itself without having to disassemble it further. The needle was sidways in its slot, obviously an issue from the manufacturer of the MLS valve. I simply removed the spring and needle, set the needle in, properly seated, threw it all back together and the problem was solved. No special tools needed for this exercise. I was working with Kioti at the time to try and solve the problem, This particular dealership was admittedly only sufficient for basic service, but they were allowing me to do the work in my own shop while they would provide me with any parts needed. I reported back with the findings and they sent me a brand new, $800 MLS valve in exchange for the one I had sorted out. There was nothing more wrong with that MLS valve after repair, the needle valve seat look fine and 3 point hitch functioned as it should, but they obviously needed the MLS valve for a number of reasons.
At any rate, that's one possible issue. I hope this is helpful.
