These machines were/are pretty much bullet proof IF it was cared for/maintained properly. Things to look for would be leaking front axel seals, where the front wheels turn on the axel, this was very common and a relatively cheap fix. Earlier models had an issue with the backhoe cracking on the crowd stick around the pin that held it to the boom, Kubota fixed this by welding in a flat-plate of steel that reinforced the stick and stopped the cracking, check the loader and hoe for excessively loose pins/ lots of play, check for missing grease fittings, and check all fluid levels. When I am looking at used equipment I like to see it with the original paint as well, this really will give an idea of how the machine has been treated. Also I would be much more comfortable buying the machine from an original owner or a dealer that may have knowledge or some sort of service record of that machine opposed to a rental yard that had every homeowner/contractor that has never run a backhoe learn on the one you may be purchasing. Hope some of this info helps and good luck!