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Once these parts are removed, you will need to have your ECU flashed or tuned so that it does not look for these parts. Contact Us. For a better experience, please enable JavaScript in your browser before proceeding. Out of these nine that I have tested, you can easily have your pick if DEF is what you have been looking for in a tractor. Many diesels use both a DFP and either EGR or SCR to control pollution as they are aimed at two completely different forms of emission and each pollutant tends to form under different combustion conditions. One important maintenance task that Kubota owners need to be aware of is diesel exhaust fluid (DEF) yes, Kubota tractors need DEF! DEF is necessary to make sure that what exists in the diesel tractor engine is harmless when released into the environment. The engine may overheat due to a failed cooling fan. Sisu, an AGCO company with the diesels used in many of AGCO brands (Massey, Challenger for 2) started using DEF for Tier 3, primarily for the fuel economy advantage. In the US the EPA has not yet said anything about following the European standards but Europe may have more concern because of the higher traffic density and the high percentage of diesel cars in much of Europe. However any temperature over 86F you risk some evaporation due to DEF being almost 2/3 water. JavaScript is disabled. Power cord/circuit analyzer waterproof combo? However, we do not recommend that you do this unless you are absolutely sure that you will never need to use theDEF system and that it is legal in your state or country. The DOC-only engine models complement an initial line-up of Tier 4 engines from Kubota that utilized diesel particulate filters (DPF). Total:1,245 (members:43, guests:1,202). The way they do that is to deny the engine some oxygen, which is why they re-circulate the exhaust, since it is some O2 with mostly CO2. The DEF system is required by law in some states, but not all. The temperature at which DEF combines with NOx exhaust right out of the cylinder head with the valves wide open is between 1400-1600 F. The chemical reaction takes place at much hotter temperatures than on a hot sunny day. When you get to the regeneration step is when it changes the way you can use the machine. A diluted DEF without the mixture of 32.5% urea can be damaging to DEF and SCR but cases of that happening are rare. #1. However, most of their tractors fall just under the threshold for emissions requirements. It doesn't matter who does the work either, if I change the oil on it and don't correct the emissions system before returning it to service they can fine me. Classified as Minimum Risk for Transportation.