Technical manual on the electronic and pneumatic architecture of Claas Axion tractors, models 810-850, written in English. The manual details the component layout of the pneumatic and electronic systems, including the control modules (ENG, TR, REH, HYD) and their communication via the CAN bus networks (Powertrain, Claas Vehicle, Hydraulic). It explains fault management, error code display, and function distribution for the Hexashift and Cmatic transmissions.