As a tractor owner. Two things, the DPF & SCR (>=75hp) on a tractor is not a great idea --
1) Tractors are typically owned by low margin businesses (i.e. farmers) that need to be repaired in the field AND need to be repaired quickly, else you loose a crop. Adding complexity to tractors literally can cost the farm.
2) The actual emissions reduced is questionable. Tractors run significantly less than a truck, like 50-100x less often. Further there are at least 2x more trucks sold per year
3) To run the SCR system, the engine had to run hot for like 20 minutes burning extra fuel and required DEF (yet more input costs)
3) The emissions they are trying to reduce with the these are likely not excessively harmful from a tractor; largely because most tractors who need an SCR system is >75hp, which also means they're typically used on a large farm (100+ acres). Which dissipates the risks substantially.
For reference my 2022 Kubota tractor repeatedly had issues with the DPF / SCR system, mostly the software to enforce environmental rules. This lost us ~$20k one year due to the tractor being knocked out for a week (I was mid-cut for 140 acre hay, rained & rotted in the field post-cut).
For reference, I was very much ready to bypass the SCR system, but decided against it to keep the warranty. It had nothing to do about "right to repair", I figured out exactly how to bypass it.
I've watched youtube videos where the farmer is complaining that his million dollar combine has to do a regen cycle. Each hour that machine is running is costing the farm hundreds of dollars in depreciation.
> For reference my 2022 Kubota tractor repeatedly had issues with the DPF / SCR system, mostly the software to enforce environmental rules. This lost us ~$20k one year due to the tractor being knocked out for a week (I was mid-cut for 140 acre hay, rained & rotted in the field post-cut).
That's infuriating. This kind of thing is why I specifically sought out a late '90s-early '00s Kubota, which has been great. Granted, I'm not doing anything commercial with it, and it hasn't been completely without issues. I had to make some compromises up front, I was initially looking for an L3710 DT but settled on an L3010 HST because the price was right and it was local. Added rear remote hydraulics last year, welded up some rust in the floor pan and repainted the bodywork. This year I will have to tear it all down again and split it to fix a hydraulic leak coming from the clutch housing (suspect front driveshaft seal). Still need to fabricate some brackets to hang the backhoe subframe. Need to put new ends on the tie rods because they're rattling like crazy. So it's not maintenance free, but the tradeoff I made is that there isn't anything on this machine that I cannot repair. Everything can be rebuilt, parts are available. In retrospect, would an older, simpler machine be a good tradeoff in your situation? So far I probably have 50hr/yr invested in tractor maintenance, but that includes some big ticket items so maybe over time that'll average out to ~10hr/yr. I could see how this might factor in the tradeoff.