Hello Chris, glad you posted here about this tractor. After I got your email I replied - but your ISP wouldn't accept it.
I'm a fan of this Kubota model. I had an L4150 myself for a few years. They have the very smooth and reliable F2803 5-cylinder engine. Everything on these machines is over-built - very nice units.
With no loader and with turf rubber it is admittedly a slow seller. Does it have a ROPS or canopy? Any extra hydraulic remotes? (valve levers beside the driver's seat?) Do we know if the fluids have ever been changed? Are the clutches ok (any sticking or chatter?)
An average L4150 with 4wd, turf rubber, mechanical shuttle (clutch-type) and no loader might bring around $4k-$6k. Low hours can add 30% or more if the buyer considers what a new machine of similar weight & power would cost. Take care, Dick B