Hydraulic Pump Spare Parts Repair Kit CYLINDER BLOCK For Rexroth AP2D25 Excavator Pump Parts Actuate the swash plate and adjust pump displacement Linked to the swash plate, the servo piston moves linearly back and forth under pilot oil pressure to alter the tilt angle of the swash plate: A greater swash plate angle raises pump displacement and delivers higher output flow. A smaller swash plate angle lowers pump displacement and reduces output flow. Implement load sensing and