My tractors are similar, but not “Super” sized
Removing the filter will allow some fluid to drain. Under the filter is a pipe plug with a square female recess. Use a ratchet or breaker bar inserted into the plug and remove. Be prepared for ~ 6 + quarts to drain
I have changed the hydrostatic fluid probably 3 times in 25 years and many more just filter changes. Last drain was this (2020) spring. Fluid appeared like new. I have never removed the rear cover to clean the differential
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1863, 1864, 48" and 54" mower decks, 54" snow plow, 451 snow blower, TracVac 580
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