CONTROL FUNCTIONS CONTROL FUNCTIONS 2) 2) The swivel angle of the swashplate ( 13 ) is steplessly variable. Controlling the swivel angle of the swashplate changes the piston stroke and therefore the displacement. The swivel angle is changed hydraulically by means of the stroke piston. The swashplate is mounted in swivel bearings for easy motion and it is kept in balance by a spring ( 2 ). Increasing the swivel angle increases the displacement; reducing the angle results in a corresponding reduction in displacement. 5 4 3 2 6 1 7 8 9 13 10 12 11 2-6