It's all well and good that you want to update equipment but you do not say what your budget is. Buying any used tractor especially one that is 30, 40, or more years old is a gamble even if it is a 4020. We have run an 8430 articulated and it has had the engine replaced with a new at the time 50 series motor, hi-lo redone, and new axle bearings being of the major updates done. It has served us well given the number of hours on it. There were improvements made on the 40 series articulates given the serial number including the hi-lo and a crankshaft driven oil pump. The late 40 series articulates command more money too versus an 8430. I would take thorough stock of the situation including the fact that after a few years you know your 8430 versus a freshly painted 8440 that could be hiding expensive problems under the new paint. History is so important when looking at an older used tractor so I would be reluctant to move the 8430 unless you find a well known replacement. 4520's are nothing special especially when going up against an IH 1066 but they have served their owners well enough when taken care of. Your 2640 and 2510 are decent enough tractors without seeing them for myself and knowing what problems may pop up in the future. The tractors I would be looking at moving are the 2840 and 2940 but they do not command much money in terms of trade. You certainly would not get a 4020 even up for one of the two and maybe not the two together depending on the 4020 in question. Again, it comes down to what kind of money you have to make these moves. With the price of milk where it is presently are there other areas where that money might be better spent. Without being close to your situation you might be better off keeping what you have save one tractor or so.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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