Excavator REXROTH A10VSO PUMP PARTS A10VSO63 Cylinder Block Excavator Pump Parts Drive swash plate movement and vary pump output displacement Joined to the swash plate, the servo piston makes linear reciprocating strokes actuated by pilot pressure oil to adjust how much the swash plate tilts: Greater tilt angle increases pump displacement and boosts outgoing flow. Reduced tilt angle decreases pump displacement and cuts outgoing flow. Enable load sensing and power modulation