Since purchased used, did the previous owner provide you with an owner's manual? I ask because I have a JD L130 lawn tractor that has been in the family since 2005. Purchased new by my FIL, passed to my BIL, now mine. Each has promised that they would give me the owner's manual that was filed away "somewhere". I've put 400 hours on the machine and still have not received the owner;s manual.
Sadly, I don't believe that Kioti provides online manuals for their machines.
Hopefully, someone can provide the information that you need.
After thinking a bit, it's cold out where I'm at. Could it just be cold hydraulic fluid? Does it quiet down after warm up? Do all functions work properly?