Long-term test: John Deere 7530 A 7t tractor rated at 175hp and capable of boosting to just shy of 200hp – it sounds like the ideal mid-weight workhorse. But does John Deere’s 7530 live up to its impressive on-paper billing? Nick Fone takes a look at the long-term performance of a tractor that, three years ago, plugged a glaring gap in the John Deere line-up and has since gone on to enjoy significant sales success