Kuhn Farm Machinery will introduce a new range of twin rotor rakes as it launches a number of new grass harvesting machines at this year’s Grassland & Muck event.The GA 8713 and GA 9513 extend Kuhn’s range of semi-mounted twin rotor Gyrorakes that now includes models with working widths ranging from 5.5 to 9.3 metres. Characteristically well-built, Kuhn’s latest Gyrorakes have been developed to provide the performance and reliability required for UK-specific conditions.The patented Masterdrive two stage gearbox is a key attribute on the new machines. Using bevel and ‘spur gear’ reduction, this feature is exclusive to Kuhn Gyrorakes and is a significant factor in their reliability and suitability for intensive work. The gearbox is totally enclosed for minimal maintenance and – with no crown wheel and pinion – it is designed for reliability under intensive use, with reduced potential for wear and lower risk of breakdowns.The two new Gyrorakes also feature tangentially mounted tine arms and double curved arms to optimise raking performance. They also boast excellent ground following at high speeds – a characteristic that is made possible by Kuhn’s three dimensional rotor articulation and the six-wheel undercarriage on each rotor (including a bogie axle).Windrow width can be adjusted from 1.40 to 2.30 m to ensure compatibility with the pick-ups of the largest balers and raking height is easily adjustable. A pivoting headstock and good ground clearance for headland turning aid manoeuvrability whilst safety in transport is ensured by hydraulic rotor locking.Kuhn’s Gyrorake range also includes fully mounted single rotor models with working widths from 3.2 to 4.5 metres.Grassland & Muck 2014 will also see Kuhn launch new developments in round balers, bale wrappers and centre pivot mowers.