Hi Dennis, welcome.
It would be great to have a pic of the valve lever layout but I don’t think you can post pics as a guest.
How many levers do you have? Have you tried moving them slowly to test their function?
Mini excavators are all pretty much the same and follow standard operating conventions.
What are the names of the manuals you have for it?
Some info: “18 HP mini excavator with 2100 RPM engine, backfill blade and 16in. bucket. 9 RPM platform swing speed and a backhoe volume of nearly three cubic feet. Digging arm swings 50 to the right and 45 to the left. 30 gradeability ensure performance in hard-to-reach areas.”
Pretty sure it’s the (older model) Yuchai YC15-6 with the Laidong engine.
Does it look anything like this?