Excavator Pump Parts AP2D36 Piston shoe 2.409-00140 Set of 10pcs Excavator Parts Force Conduction and Self-Adaptive Angular Movement The piston creates reciprocating linear motion inside the cylinder block, and the swash plate is an inclined fixed component. By means of spherical hinge connection, the piston shoe swings freely following swash plate angle variation and transfers piston axial thrust smoothly onto the swash plate. Without piston shoes, point contact will appear