For the platform and price it's hard to beat. Some tractors just don't play nice with the emissions systems and it's a hard issue to really diagnose for dealers.

Our dealer said they’ve never seen DEF concentration issues outside of fuel contamination. I’m nearly certain the tractor uses the NOx sensor to calculate concentration so a plugged injector, bad pump, hose failure, and concentration all trigger the same code series. You’ll probably need a tech with the EST software to clear the code and run a test if the tractor has already derated. If it’s still running fine check the injector and hope that’s the problem. We’ve switched to the cheap DEF (premium has some additive that made it foam bad and get sticky)and keep the tractor idled up at all times. Seems to have helped alot.

Thanks for the info my friend, I really enjoy the tractor when its running right. I’ll keep after it.

Cleaning the injector helps delay the issue but it hasn't completely solved it. I talked with one of our local techs for about an hour about the issue and potential solutions and he had some thoughts. He mostly works on the sub-150hp machines and he said this problem is really hit and miss. They've had machines go out that never throw codes and some that have chronic issues. His best guess is it relates to operating temperature and idle speed. We've been doing a test where we blocked off half the radiator with cardboard to force higher operating temperatures. We used to do this in the winter only but have had the cardboard in since shortly after I filmed this video. the goal is having the temp gauge at least halfway up under any load condition. We also are avoiding low idle like the plague and time will tell.

Tractor threw a bearing in the mid-range of the transmission. Managed to make it's way all the way into the pan intact and the fluid was free of metal debris. Doesn't appear to effect performance but it'll be a $7,000+ job to pull it all apart at some point and put things to right. Kinda a freak deal in my opinion. Tune from Reimer fixed the emissions issues and otherwise it's been a good tractor. I've also got a 105A which sucks for operator comfort but the extra power pays for itself fast.

I've got two theories. One is the wiring isn't done great on the machines causing intermittent faults that trip the emissions up. Every time the dealer reset the computer the code would come back with everything still testing good on our machine. Second is design parameters for the emissions system don't line up with actual use, ie these machines get idled alot and the engineers designed them like a combine running full tilt for most of their lives. The diagnostic process the dealers use just can't seem to pinpoint the issue so they never really find a good solution.