No oil at all? If you had nothing but clear water I might consider removing the deck and having a look. More than likely though, you had some water followed by a "chocolate milk" fluid come out.??. If the tractor sit outside (and even if it doesn't) water finds its way into the rear end. Drain the fluid, pore in 3-4 gallons of kerosene and drive it slowly in 1st for 2-4 minutes (don't put any load on it or let it get hot). Drain it again - if the fluid is filthy repeat. When the kerosene comes out pretty clean, refill with 90 wt and you should be good to go. With oil prices as they are you can expect to drop some change on both kerosene and oil (it take 6 gallons)to re-fill. After a good cleaning you can also probably expect to change a lot of the seals (transmission shafts, breaks & axels), because the kero and new oil will remove all of the gunk that was previously plugging the leaks. After the cleaning, change your fluid every year if the tractor sits outside or you use it hard, every 2-3 years if it is inside and you use it for light work. If you take care of the transmission and use it correctly you will likely never have a problem with the rear-end.
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