Ive worked on construction equipment for 20+ years.. There are 2 brands of backhoe I would try to avoid if I was going to buy one. JCB being one of them and terex the other... The terex is a good strong heavy machine and there is no one specific problem they have but they are more problem prone IMO than other brands such as deere and cat. They are not as hard as JCB to get parts for but again, not as easy as finding a Deere or Cat part. I like a lot of the Terex equipment. Their cranes are good, the manlifts are good, the backhoes would not be my first choice and their rubber tire loaders are at the bottom of any list.
That is very low hours on the one you are looking at. Unless its just too good of a deal to pass up id suggest to look at another one...