The Claas Arion 520 is a row-crop tractor produced from 2007 to 2011 as part of the Arion 500 Series. It features a John Deere 4.5L 4-cylinder turbocharged intercooled diesel engine rated at 120 hp (89.5 kW) with Tier 3 emissions compliance. The tractor has a 24-speed Hexashift partial power shift transmission with power shuttle, four-wheel drive, power steering, and optional pneumatic trailer brakes. It includes a standard cab with air-conditioning. Hydraulics are open center type with optional load sensing and up to 6 valves. The rear PTO offers 540/1000 rpm with optional 540E/1000E speeds. Dimensions include a 100.8 inch (256 cm) wheelbase, 192.5 inch (488 cm) length, and 116.6 inch (296 cm) cab height. Operating weight is 12060 lbs (5470 kg) with ballasted weight up to 14163 lbs (6424 kg) and max capacity of 19400 lbs (8799 kg). Front tires are 14.9R28 and rear tires 18.4R38. Related models include the Claas Arion 510 and Arion 530.