This is on a non-serviceable one.
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Do was you want. But non-serviceable to me would mean the oil is good for the life of the mower. So to me you are just looking for problems by changing the oil. All you are doing by changing the oil is disturbing the metal chips that form in the bottom of the case. Yes they are there but to remove them you would have to disassemble the complete transmission. Leave well enough alone because it was designed that way. Kubota knows what they are doing.
I made contact with Kubota few months back , they said you can drop the pan and drain oil that way. But use extreme caution so that nothing falls out of place. They said it does have a replaceable filter inside. I didn't mention pumping the oil out to them at that time.
