An implement detection system on a tractor having a linkage system for attaching an implement thereto. The linkage system comprises a lifting cylinder having a position sensor and a pressure sensor and the system further comprises a tractor control unit which records a cylinder pressure and a lifting height. The control unit has recorded parameters relating to an implement of minimum weight as selected from a range of implement weights recommended for the tractor. The parameters comprise a cylinder pressure value pL which is measured at a comparative height value hcomp and to determine whether an implement is attached, the linkage is moved to the comparative height hcomp and the current pressure p is measured, or the linkage is moved to the pressure limit value pL and the current height hc recorded. If the current pressure is higher than the pressure limit value pL, or if the current height hc is lower than the comparative height hcomp, a signal is sent to the control unit that an implement is attached.
