The TERRIA is easily operated using 3 double-acting spool valves. Clearly labelled valves are located on the drawbar to control the various functions.

1st spool valve: Folding the stubble cultivator and setting the triggering pressure for the stone protection system

2nd spool valve: Controlling the chassis when raising and lowering the machine at the headland

3rd spool valve: Setting the working depth using the jockey wheels and rear roller, as well as releasing the transport interlock