AP2D-36 Return Plate AP2D36 277-4111G Compatible with Hyundai DH80 S80 Main Pump ZX70 Main Pump Hold every piston shoe captive and prevent separation off the swash plate. Under high pressure impact during cylinder block high‑speed rotation, spring force pushes the cylinder block to press piston shoes firmly against the swash plate inclined surface. The set plate encircles piston shoe tails to restrict outward flying motion, guaranteeing continuous fitting between piston shoes