Diesel emissions
1. diesel engines produce NOX which like cow farts are bad for the environment, to reduce NOX due to high combustion temps so a exhaust gas recirculation (egr) was introduced to ad cooled oxygen depleted gas to the intake to cool the combustion but this created more soot.
2. To reduce soot a diesel particulate filter (dpf) was added which needed to run hot especially during regen, more heat more NOX so the SCR was added to inject urea to convert the NOX into nitrogen and water.
Some manufactures went with a lean fuel system to be able to eliminate the expensive dpf and instead run a diesel oxidation catalyst (DOC) and scr with def.
Massey Ferguson 4707, 4708, 4709 and 4710 all use the 33AWIC engines with different fuel maps in the ECU,
The 4707 is a detuned 4710 without the emissions so I chose to purchase a 4707 and install the 4710 fuel map.
I hope I got this emissions info right.