So there is an Exhaust Filter Cleaning Mode Switch that has the following 3 positions:
1. Parked
2. Auto
3. Disabled
I normally leave mine in Auto.
There are also 3 indicators in the instrument panel that are normally not on. They are:
1. Exhaust Filter (Restriction)
2. High Exhaust Temperature
3. Exhaust Filter Disabled
So at 115 hours, the High Exhaust Temperature light came on. The engine did not automatically rev up to 1800 RPMs, or anything like that, but I kept the RPMs up anyway, but after about 20 minutes, I was done doing what I needed to do, so I moved the switch to disabled and shut down the engine after a few minutes of letting the exhaust cool down. I moved the switch back to Auto after shutting it down.
Next time I started it back up, after about 10 minutes, it kicked into cleaning mode again, and I just let is complete this time, which took maybe 30 minutes. I was cutting a field, so no big deal.
My understanding is that it is only if you constantly prevent it from doing the auto exhaust filter cleaning for an extended period of time, say 500 hours, the following will take place.
The caution light (!) and exhaust filter restriction light will come on, and engine power is reduced, and the instrument cluster will start beeping at you. The tractor now requires a parked cleaning before full power can be restored.
1. You now have to stop the tractor, put transmission in park, disengage PTO, and set engine to 900 RPM.
2. Press and hold the exhaust cleaning switch in the parked cleaning position for 3 seconds and release
3. Engine speed will ramp up to 1800 RPM and the parked cleaning symbol on the switch will begin flashing
4. The process will take 30-45 minutes, during which time the information display in the dash will go from 1 to 100 for prep stage (engine rpm increasing and temp gets to where it needs to be), and then again from 1 to 100 during the actual cleaning stage.