Two plugs for the same thing????

[smokeys427]

I found this on Michigan Irons site.... It does appear to show a fill plug on the front of the Trans. My CK20 has the fill on the front of the tranny as well and has a red cap, on the right hand side of the tractor and the level check is on the left hand side (also on the front of the tranny).

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Rancho

Rancho and Patches, it seems like you guys are correct as that is the fill plug I used and yes, it did show to bring it up to specs VIA the sight glass on the side. My DS3510 does not have a dip stick either just the sight glass. Also Rancho, that pic that you included shows the plug just like what I was talking about. I'll tell ya reading this manual sometimes makes no sense at all.
I just filled it from the top because that seemed the obvious place. But this is coming from a guy that got off a old trusty Ford 8N.
Thanks for everyone here for jumping in and helping out