Hiya,
Looks very clean, sure looks a lot cleaner than my '88 318 that has just under 600 hours on it.
Couple things for you to check when you get there to look at it:
Looks like the deck height is set up wrong and it's rolling on the wheels. There is a turn screw on the rear that is the travel limiter for the mid lift, the deck is designed to hang in the air and the wheels are for anti scalp. With 2K hours on it, check the spindles on the deck and the idler pullies, especially the "Mule drive" as Deere calls it.
May want to ask if the coil in the the pto clutch has been replaced, common to see them go. (FYI, never flip the pto switch at anything more than 1/3 throttle, they last longer that way. (mine is original)
There should be a clear tube coming out of the transaxle with a short glass section, that's the fluid level indicator. The fluid should be clean and at the proper level. The manual calls for either Deere fluid ot type F transmission fluid so don't be suprised if you see pink fluid. Peak your head under the tractor in front of the rear wheels, look through the lower screen at the hydro filter, make sure it's not the original.
And FYI
There was a Dtac on these for a starting problem, Deere still offers the kit if you find that one diesn't have it installed. (starter relay to lessen the amperage draw through the ignition switch which was the cause of a lot of "The wiring problems" mentioned above)
The Onan is pretty bulletproof if you keep the oil clean and the cooling fins clear of chaffe and clippings. a unit with 2K hours, I would expect some oil past the valve guides and a little smoke here and there. There is also a hydro fluid cooler to keep clear, see the manual.
Bottom line, do the research, check it out carefully and you should be OK. The 318 was Deere's appology for the 317 and they over built everything on it to regain customer confidence. It is equivelant to what Deere offers with the x700 series today.
My 2 cents,
Tom