504 is a step up from an H for sure! Live hydraulics, IPTO, TA, factory 3 point with draft control. For my uses, an H or M would only be for antique tractor pulls. Which I am shopping around for.
I have a Farmall 504 diesel that I put a Koyker 220 loader on in 2008. I am the 3rd generation owner. It has done almost everything that I ever threw at it. Sometimes I felt it was a little gutless, but its over 50 years old and needs an inframe OH and inj pump work. I have maintained 50 acres with it for the past 8-9 years.
It will pull a 10' disc, it will run a 6' rotary cutter, it will run a 88" flail mower, it will run a 66" drum mower, it will run a Vermeer 504C round baler, and the list continues. It will out work a H and is about the same size and weight.
The only downfall is the C153 gas engine. I don't think its a sleeved engine and if it needs rebuilt, it will require machine work. This is what El Toro was in reference to. Personally I would not ever entertain the idea of a gas tractor if I was going to actually work it. Gassers have at least 2:1 fuel consumption over a diesel.
The D188 is sleeved. The D188 is a tough little diesel! Keep it at 1800-2200 and it will work as long as you can stay on it and use less than 2 gallons/hr.
I do not believe that the 504 is "more complicated" to work on. It just has more parts because it is more of a true row crop tractor. Hence TA and draft. Not saying the letter series are inferior, in any way. All I'm saying is the 04/06 series have more features that make working a tractor more efficient than the letter series. Which is true for most makes when the next generation of tractor went into production.
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