Zen, here are a couple of pictures of my 284.
First picture – there are actually 4 drain plugs for the transmission/rear end. While you are laying under the tractor, I suggest that you also clean out the bell housing Weep Hole.
Second picture is the drain plug for the hydraulic sump. I only tried draining it once from there because of the mess that was made. I usually draw it out through the hole with the dipstick. It takes a lot longer, but I hate cleaning up messes.

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