The hydraulic oil appears nice and yellow-gold in the sight glass. Filter seems to be just shy of $100 online. Does that sound right?
Drive oil specification is unclear. I guess I need "EP" GL5 80w90 oil. Is this any different than regular 80w90? Can I just get this on amazon/autozone?
I was able to order a belt locally from a dealer (a rental place, real nice guys), unfortunately they know nothing about Gehl excavators, other than what's actually available in the parts book. They weren't even aware that they made excavators. Belt ended up being $65 out the door. I'll probably need to remove the radiator in order to install it.
I do agree that it likely hasn't been properly serviced properly. It seems like it could be a very nice machine.
How much fuel does this thing use at idle? It seems like the fuel gauge is still at full, but I'm thinking that can't possibly be right. Also not sure how to test the indicator lights.
Swing gear seems to be a tiny bit sloppy (I'd say maybe 6" either way, fully extended). Is that cause for concern? Personally it doesn't bother me.. but I don't want it getting worse.