Mine has 1450 hours on it according to the meter. I know that doesn't mean much, I've only had it since 1400 hours. So, what kind of life it had before me - I don't know. I assume it's stayed on somewhat flat ground. The stickers for the Deere dealer in Seward, NE (about 70 miles away from me) are still on it. Part of those 50 hours was when I left the key on and it ran the meter until the battery died. The shop I used to work at took sealed bids to mow the property in the summer. I got the bid the first summer I worked there and I mowed the road ditch with that 317. At times I had to lean over to get the uphill tire to stay on the ground. I would say probably half of the hours I've put on were from that - I made some good money at $85 every time - and it took less than an hour!
It uses some oil, and I should probably change it more often. After I get my 300 back together (which should be soon) I'm planning on sending the 317 down the road, as I have my eyes set on a 400 that needs an overhaul.
The 317 has been a good tractor. I haven't done much to it. I did a full service when I got it, and replaced the front wheel bearings. I rebuilt the 41" mower deck - new blades, spindle bearings, tensioner idler, and both belts. I have done nothing other than mow with it and air up the occasional flat tire. It's a real horse whether mowing or blowing snow, and now with my new weight bracket I should be able to handle anything winter can throw at me! But, we've had two storms here in central Nebraska all winter totaling probably less than 12". I guess we're due! I wanna try out the new weights and lights!!!
I've got half a mind to sell it to my cousin cheap since his series II is currently stuck due to sitting outside for many years - otherwise his is a fresh rebuild that the previous owner never could get running. My cousin is kinda nervous about a series I with that many hours on it thought