The R310 was not a big seller in the USA and had a relatively short production run. We sold some R410s and quite a few R510 back in the 1990s. The R310 was rated at 26.6 gross hp, came standard with a .4 cu yd bucket, had an operating weight of 4980 lbs (w/ 2 post rops) and had a rated tipping load of 2900 lbs. They were cute little machines and nice to run. When the 20 series came about in the late 90s, Kubota no longer offered this size in the US. To this day the R420 is the smallest here.