Maybe Dick Bargeron "rbargeron" will see this post and reply. He has owned two L345DT's and is apparently a big fan of this old workhorse. He was very helpful to me when I owned one. Mine was a 2WD without a loader and in pretty rough condition, so what I paid for mine and sold it for wouldn't be much help to you. I would say that 1700 hours is not very many for a tractor of that vintage. I can also say I never had any problem getting parts for Larry while I owned him. Good luck.
edit: While we're waiting for Dick to weigh in, here's a thread you might want to review.
Hi - the thread BillG linked above covers a lot of what I'd still recommend today about what to look for. If you posted some pictures we might be able to guess at a price range. Here's a link to my current L345 that I recently fitted with a new FEL. This one is a "B+" restoration so might have a market value around $10k maybe? Value of a 30-year-old tractor depends 100% on condition. Take care, DickB