I checked last night. The knob is cranked as far as it will go and the bracket holding the springs is pulled up tight against the seat frame. The springs are stretched as far a they can be pulled. I sat down and bounced just a bit and it was very easy to bottom the seat but it seemed to squeak a bit. I lubed it up with WD40. Bad Idea. Now it bottoms even easier but at least it doesn't squeak.. I am going to see if I can find stronger springs or perhaps add a couple of smaller diameter springs inside the factory springs. The springs just aren't strong enough. I'm not going to spring for an air ride seat. I'd like to but...
more info, for what it's worth.
Spoke to my dealer this morning and asked about this issue. He said he is aware of the problem and has a lot of fella's complaining about the same thing. There is not, at this time, a fix from kubota but it is being addressed.