Dunno. My Dad was getting a filter for it, and had Kubota run the number; mine came up as an '87.
Mine is HST 4wd, but has no power steering. I am slowly changing from Turf to R4. I have R4 rim/tire on the back, w/turf on front right now. My rear turfs got a nail, but the side wall was too weathered to remount safely. I put TnT on it a couple years ago. Three years ago I added the loader; I got a Bushhog.
Yes, the front is light with a mower mounted on the back. Even with weight on the front, it is still light...
These things are tanks compared to the other smaller Kubota's. Like I mentioned though, I feel the 19hp is a bit under powered for the size of the tractor. Note they have 29hp(
B2910) in the same size tractor these days.
Mine works its little heart out though! Biggest spot I have problems is mowing my Dad's property. It has thick tall grass in the fields that just bog me down, even with the smaller 48" rear rotary mower.