JD 690B excavator help...please!

We have a small Cat, and it is 24v.How old is this machine? If you grab the serial number, Cat should have all the info available. How are the tracks, and pads? Sometimes the parts are worth more than the machine to some buyers. I just bought new tracks(chains and pads) for our Hitachi EX1800. They were well over 100 grand, and 3 months away(luckily, they left Japan before all the disasters).
Advertise it in the trade mags as well as Craigslist, e-bay, etc. Someone will buy it, don't you worry.