Bobcat 763 Chain Case Drain Plug?

I recently drained the fuel tank, and just backed the end of the machine over a slight drop off, and could easily get to the stoppers. I pulled down the metal pin in the middle with a pair of plyers and it came out ok. Just push the plug back in first, and then push the pin back up. It does not seem to leak. I want to drain my case next also. Does not appear to be gasket? Can one clean it out ok from the middle cover? My 1993 machine must be before all the safety switches, as it will start no matter where the bar, brake or seat is.
What is the service interval for the chain-case fluid / oil??
 
I take off the front chain case cover and use a suck bucket to suck out the oil with the shop vac.
THAT oil appears to be BAD as it gets. I'm afraid to know what mine looks like. I am certain that a few may need to be drained & refilled as well. How much fluid is supposed to be in there? 7, 8 or 9 gallons?? I have (2) 753's, (1) 751 & (1) 863. I don't like the added expense of changing it all out, but I really don't want a bunch of surprises later on, either.
 
THAT oil appears to be BAD as it gets. I'm afraid to know what mine looks like. I am certain that a few may need to be drained & refilled as well. How much fluid is supposed to be in there? 7, 8 or 9 gallons?? I have (2) 753's, (1) 751 & (1) 863. I don't like the added expense of changing it all out, but I really don't want a bunch of surprises later on, either.
seems that we manged to over complicate this. its a chain case. drain the oil wash out with diesel. and fill it back up,
 

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