20 years ago, Claas claimed to have introduced the world’s first four-rotor rake – namely the Liner 3000. The aim was to eliminate a bottleneck, allowing the capacity of ever-larger forage harvesters to be realised. The manufacturer says that its current four-rotor Liner 4000 and 3600 models still follow this mantra. Following its introduction in 1999, Claas says that its engineers doubled the productivity of existing twin-rotor rakes with the Liner 3000. In a single pass, the machine could mop up 12.5m of grass into a single, central swath. Two years later, in 2011, the Liner 3000 was replaced by the Liner 3500, followed by the Liner 3600 in 2015. At the heart of every Liner, says Claas, is the rotor dome assembly that’s “permanently lubricated in an oil bath”. All integrated tine-arms employ a patented attachment system. The manufacturer says that the integrated pre-defined bending points are located outside the rotor dome. This is to protect the dome components. Of course, Claas doesn’t just have a lengthy legacy when it comes to rakes; it also has a significant history in the self-propelled forage harvester sector. It all started for Claas with the 120hp Jaguar 60 SF (pictu...