As far as I know the emission regs don't apply to stuff under 80 hp but I could be wrong.
I can tell you this... if I have a choice between an engine with DEF and an engine with EGR... I'll take the one with DEF every single time without a second thought. EGR is a nightmare that doesn't work and never will work on a diesel engine (reliably). With DEF you essentially have a Tier II engine with aftertreatment and Tier II engines were about as good as diesel's got in most respects.
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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