I just bought the 590 CK turbo 4 bucket exstend a hoe 4000 hours needs paint, one of the loader bucket hoses has a drip under full pressure everything so far is great. I do not know what year it is. Can I tell from the sr# JJG0206848
You might look at equipment parts source. They have a chart with a lot of years listed.
Can always phone the dealer as well. Afraid I'm ignorant on this other than all case serial
numbers seem to start with JJ.