Actually there were several different versions of the 404 engine and the ones with the small pump work out better in a 4020 because of the better low end power they offer,, the 7020 has the big pump and and was strong when run at higher RPM's but doggy on low RPM's the best up grade engine for a 4020 is a 4240 engine then turbo that..466cid and great low end power plus it will fit in nice and clean..and this engine was in 6620 combines so they are readily available..in the $3500 range..
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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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