That fill plug does both- The transmission and hydraulics are one common reservoir. The dipstick, if you haven't found it yet, should be on the right side by your heel. If it shows that it's about 1/2" low, on both our 165 and 285 that's about 1 gallon. Should be pretty similar for yours as well. The modern day oil is MF Perma-Tran III. You can use any trans/hydraulic oil that meets the Massey specs, although I can't say what those are. If you don't know when the last time the oil was drained or it's a new to you tractor, I'd recomend draining and re-filling it. There are 2 drain plugs that you have to pull out to drain it all. Have 2 5 gallon pails on hand because it should hold right around 8 gallons. There is a wire mesh screen inside, to get to it you remove the PTO shifter plate by your left heel. That screen is the only filter in the system, so if the chunks of metal are too big from grinding gears and such, it really should be flushed out as Aaron said with diesel fuel and then refilled after it drains all night. The filter is something that can be removed, rinsed out, and then put back in. There should be a safety wire holding the bolt that holds it in place, you have to replace that wire as well. Donovan from Wisconsin
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