An agricultural baler (70) comprises a shaft (3) for coupling with a PTO (15), a flywheel (2) connected to the shaft (3), and a plunger (13) connected to the flywheel (2) via a crank (6). The agricultural baler (70) further comprising an auxiliary motor (5) connectable to the flywheel (2), the auxiliary motor (5) is adapted for rotating said flywheel (2) depending on a control signal (S). Means are foreseen for determining a position (6) of the crank (6). A motor controller, connected to the said means and to the auxiliary motor (5), being provided with an algorithm for determining the control signal (S) for automatically rotating the flywheel (2) to a predetermined launch position.
