machmeter62, Yes Kubota has replaced many valves *early on* but it's a different story now. At first, the dealer will say that they never heard of anyone having the problem with the valve (but you get talking to the mechanic in the shop... after awhile they'll say that they HAVE changed a couple of these valves). Next they'll tell you that you have an "economical" tractor and that's the valve you get. After that doesn't work, the dealer will finally "look into it"... I was told that the dealership can not "OK" the replacement valve, the area rep is doing it on a case by case basis and he'll be here next month. I got busy and called him 2 months later, "oh, he never showed up"... something about he'll be by soon. (I guess they don't have phones in this town).
Another month goes by, finally given the same line "Economical tractor" from the "area rep" (I did not get to talk to him this is what the dealer said) but they (Kubota) would pay half for the valve ($150 of the $300) and the dealer would "help" me on the labor costs!!! (gee, thanks but no). So, from another dealer, I got the address to customer "service" (& I use that term loosely) and got no reply at all from my letter. I guess I should have sent it as a certified letter.
So I'm trying again before the warranty runs out next year with another dealer who said bring it in and I'll take a look at it. 60 miles away and I have to borrow a truck and trailer, but first I'm going to try what has been said above... but I'm pretty sure with the 1" valve, this tractor will be far from any STANDARD tractor that I know of.
Side rant: 16K for a tractor is NOT economical when I still can not afford a box blade of my own. The valve can not be used for grading (wasn't that one of the purpose of a tractor?)