That pressure differential switch is the primary control that tells the ECU to do a regeneration cycle I'm surprised to hear that we can run our tractors without it plugged in without the ECU timing out and kicking into limp-mode. Either way, the DPF would eventually plug up limiting power to the point where the tractor wouldn't make power. That said, with the plasma table expected to come in next April, my Tinker-Time will be spent trying to learn the software and immediately making some of the upgrades I hand made for my tractor like the steering cylinder guards, the skid-plate out of heavier material, a insert for the brush guard that works with the headlights, and some other stuff before I turn my attention toward a DPF delete kit.
That said, since it is winter right now, one thing I do suggest to anybody who runs their tractor in lower than freezing temperatures
and is experiencing frequent regenerations cycles as a result of their tractor never warming up, is to swap out their thermostat for a warmer T-stat. Running too cold and having regeneration cycle problems was a real problem for the first few years of Tier IV engines and their field repair in fleets was to pop in warmer T-stats. In our case with the NX tractors (and l suspect any Kioti tractors that take the same part number T-stat as our NX tractors) a Stant 48808 is a drop-in replacement. Do not worry that the bypass is a little longer and stronger than stock as the T-stat works great even in high 90 degree temps here in Minnesota. Don't reuse the existing stock T-stat gasket, it'll leak even with RTV, so make a new one or get a new one.
