COMPONENT OPERATION / Pump Device Delivery Rate Increase/Decrease Operation The main pump delivery rate is changed by changing the swash plate (3) angle (displacement angle) and changing plunger stroke. Servo piston (2) is moved by pressure oil from the regulator and the swash plate (3) angle (displacement angle) is controlled. As swash plate (3) is connected to servo piston (2), the swash plate (3) angle is changed by the movement of servo piston (2). 1 T142-02-01-001 1 - Shaft 3 - Swash Plate 5 - Cylinder Block 6 - Valve Plate 2 - Servo Piston 4 - Plunger 3 T3-1-3 2 6 5 4