Excavator Parts SA8230-03340 SET PLATE RETAINER FOR MAIN PUMP FITS EC55B AP2D25 Pump Parts

Excavator Parts SA8230-03340 SET PLATE RETAINER FOR MAIN PUMP FITS EC55B AP2D25 Pump Parts

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 and swash plate friction surface and maintaining oil film.
It evenly distributes acting force and makes piston shoes synchronously track swash plate angle variation. Uniform limiting structure keeps all piston shoes at consistent tilt angles, producing steady piston reciprocation and lowering flow pulsation and abnormal noise.
It assists hydrostatic support oil film formation for piston shoes. Oil grooves machined on plate body direct high‑pressure oil from pistons toward piston shoe bottom surfaces. The formed hydrostatic oil film effectively relieves wear between piston shoes and swash plate.

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