The Claas 11509820 is a genuine OEM thermostat designed to regulate engine temperature in various Claas agricultural machinery. Featuring an 83°C opening temperature, this critical component ensures optimal engine performance and efficiency. It is compatible with a wide range of Claas models including Arion 400, Axion 800/900, Xerion 4000/5000 tractors, Lexion 700 series combines, and Jaguar 800/900 forage harvesters.