Thanks. I did not realise the chassis on the 6620 was different to the 73/7620's. I don't think we get that 6620 here in NZ though, at least not from what I have seen available. However, it looks to have the same engine as the 73/7620.I think SSdoxie is right about the Tier 4 criteria, because the 7320 and 7620 appear to be the same tractor. The 6620 is a slightly smaller tractor in length, width, weight, tire size, etc.. The 6620 does have the advantage in that it can be fitted with a frame mounted backhoe from Kioti, but not the 7320. Although I'm sure an aftermarket backhoe could be found if the need was there.
Take care
870Wing