it is a CK30 HST. What I'm impressed with is how smooth and quick the hydraulics, I have already made quick work of a couple oak tree stumps. I learned alot here on this board with opinions and comparisons. I am fortunate to have worked at a John Deere dealer years ago so I had a fairly decent idea of sizing. This machine is a far cry from the JD 650-1050 style machine of years past