a 4020 is one of the easiest tractors to split,if it's a narrow front end you should get a set of splitting stands some where, if it's a wide front wedge a couple 2X4's between the front frame and the axle to keep the front end from rocking, put a floor jack under the rear as close to the split area that you can,remove the hood and cowl,steer lines, pressure and return lines I un-hook all the wires forward to the Gen &fuel sender and lay them back over the cowl,6 oil pan bolts (3/4" wrench),6 bell housing bolts 1 1/8" wrench) water sender (don't forget this one) look it over as you go apart, you will loose a gallon of oil here and there , just enough to mess up the floor....
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