Long-term tractor test: Claas Axion 830 When unveiled at the end of 2006, the five-model Axion family showed how Claas was clearly putting its own stamp on a previously inherited tractor offering with a newfrom- the-ground-up range. Now, four years down the line, there are over 500 Axions at work in the UK – but what are they like to live with? Mervyn Bailey finds out