Agricultural machine with PTO torque limiting feature

A drive assembly for an agricultural machine comprising:

• a driving engine;
• a power take off (PTO) output shaft connected to the driving engine for driving an attachment;
• a drive transmission positioned between and interconnecting the driving engine and wheels that support the agricultural machine on the ground;
• an electronic control unit;
• an input device connected to the electronic control unit for operating the electronic control unit;
• a sensor that determines the torque transferred between an attachment and the PTO output shaft;
• and
• an actuator coupled to the electronic control unit for changing the transmission ratio of the drive transmission, thereby setting the propulsion speed of the agricultural machine such that the torque transferred between the PTO output shaft and an attachment does not exceed a pre-determined value, the electronic control unit being adapted to receive data from the input device and to calculate the pre-determined value based on the data received, and to control the actuator accordingly wherein the input device comprises a key, at the actuation of which the input device takes an actual torque value measured with the torque sensor as a nominal torque value and sends information about the attachment to the control unit.