I hate the system they used on the 3350 for the regen process. Overcomplicated, IMO, but the new software fixes it for most of them. For some, they can't fix it, so they throw parts at it (and Kubota's tech guys will advise them to do this because I am not sure they know how to fix the "problem" either). Again, it's a weird system. A mechanically injected diesel but it has a separate fuel pump to dump fuel directly into the exhaust, as well as a blower that forces air into the exhaust-both combined are supposed to raise the exhaust DPF temperature. They went through the system in depth when I was at the tech update and honestly...I got lost in all of the garbage that's involved. They also have mentioned that some people are reluctant to raise the engine RPM enough for the systems to actually work, and those are the folks who're most likely to have issues. Do not be afraid to go wide open throttle, it will not hurt anything and actually is BETTER for it. The engine is designed for it specifically.
You can thank the good old US EPA! Send your congressman a letter. I do, and I think they are probably throwing them in the trash as soon as they see my name on it, tired of hearing from me. The government knows it was a total screwup. They know that diesels are ruined forever, or at least until (1) someone comes up with a better way to reduce NOx and soot to an EPA mandated level, or (2) the mandates are nullified. (1) is probably going to happen sooner than (2) if I know our government.....
So said dealer put $4k into repairs. Did they not file the warranties? No pre-approval? The way it was written in the post, that's what it sounds like to me. That's not entirely Kubota's fault. Without seeing the actual claim(s), the fault could be placed anywhere. Keep in mind that the guys at Kubota Warranty department are bean counters and have no clue what a DPF is, or much anything else for that matter. And as of recently, they're really sticklers for doing things BY THE BOOK, in other words, if an owner has a problem that's not a big problem and continues to use it, then brings it in at their convenience-which might be outside of Kubota's timeframe that is alotted to a potential warranty claim (I think 3 days according to the warranty statement), they are rejecting them-which means either the owner or the dealer has to eat it. And chances are good that the dealer's not going to eat very many of them. They can't afford to, and they shouldn't have to because the dealer didn't build and design the equipment in question. And the owner shouldn't have to either unless it was something in a "gray area"-which happens a LOT. So my advice here is to read the warranty statement and heed to it. The little green/white booklet that goes with every new tractor, and it's also available online at Kubota's web page.
The fact that they're buying it back speaks volumes. I mean I worked for JD for quite a number of years and they NEVER bought tractors back-not $20k tractors and not $250k tractors, not a single one. They told us to fix it and if we couldn't they'd send THEIR techs out (which no dealer wanted) to help you fix it. They were jerks about it too. If they saw something in the dealer that they didn't like, the dealer could lose his dealer because of it, and it could be something as simple as not properly marking the floor walkways or work areas. If customer wanted/demanded a new tractor because of a major defect (and I have personally been through this), JD will tell you nicely to go pound sand. I hated JD for that reason (and many others). So saying that you should've went green means nothing to me. Lawn & garden stuff is completely different....they used to have the "John Deere Promise"-and we did some of that stuff, mostly hand held stuff-and I certainly do NOT miss any of that, mostly because with today's required labor rates, it makes no sense to fix something if it costs less to just replace it. Enough of JD.
They are taking the implements and attachments back because they don't work quite right on a B2650. I would not worry about what they do with them. They'll handle that. They may send them to one of their training centers and use them for training, or they may send it back to Japan for the engineers to deconstruct and help them design a new/improved one. What do you care. You're getting a new one. I would be ecstatic!