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In addition to the shifter boots, water can infiltrate the hydraulic sump through a leaky master control spring boot, or a missing dipstick. Shifter boots are #1 concern though. Often times when people drain the hydraulic sumps on these tractors, it's overlooked that there are TWO drains. One is under the transmission. The other is under the rear end housing. BOTH drain the same sump, but it takes BOTH being opened to drain all the oil. Leave one or the other, and you leave about 2 gallons of old oil in the system. To flush, I've drained hydraulic sumps, filled with several gallons of diesel fuel (or mineral spirits) and then GENTLY drove the tractor a few minutes (with NO load) then drained again. I do so with 3-point lift in down position. You will be astounded at how much crud that will wash out. Allow it to drip dry. Diesel fuel is a light-weight lubricant. It won't harm gears and such so long as it's just used to flush system. Re-fill with proper amount of correct oil. Filter is accessed behind the right side inspection cover, located near where your right foot would sit on the running board. SOME earlier models didn't have a filter/screen.
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