420 Steiner rear axle question

[slgrafton]

Hey guys, I have a Steiner 420 that I am working on. I pulled it out of the weeds about a week ago. It had been sitting outside for 3-4 years. I have managed to get it running and turning but not moving. While taking a look at the rear axle, I saw a drain plug (of course) and another open machined hole. I cannot find any info about this. I have attached a pic hoping someone can tell me what the hole is for and how to close it up. It does not appear to be threaded.

 

[Raw Dodge]

Hey guys, I have a Steiner 420 that I am working on. I pulled it out of the weeds about a week ago. It had been sitting outside for 3-4 years. I have managed to get it running and turning but not moving. While taking a look at the rear axle, I saw a drain plug (of course) and another open machined hole. I cannot find any info about this. I have attached a pic hoping someone can tell me what the hole is for and how to close it up. It does not appear to be threaded.<img src="http://www.tractorbynet.com/forums/attachment.php?attachmentid=457567"/>

M. I have 2 steiner 420s,and I have no idea what that hole is,it looks like it may have been a vent hole but it's at the bottom .those trans axles were mounted in many different configurations ,I have no idea what it is,but I know your hydraulic oil will just pour out that hole,so you can't leave it...