Excavator Pump Parts A10VS063 Piston Pump Spare Parts Set Plate Retainer Plate Rexroth R902503255

Retain all piston shoes to stop them from detaching from the swash plate. While the cylinder block rotates fast under high pressure impact, springs push the cylinder block so piston shoes are pressed onto the swash plate inclined surface. The set plate encloses piston shoe tails to prevent outward escape, ensuring piston shoes continuously fit the swash plate friction surface and maintain oil film integrity.
It balances force across all components and synchronizes piston shoe angles with the swash plate. Uniform restriction creates equal inclination angles for piston shoes, enabling steady piston reciprocation and reducing flow fluctuation and mechanical noise.
It contributes to forming hydrostatic bearing oil film under piston shoes. Precision cut oil grooves guide high‑pressure piston oil to piston shoe undersides. The generated hydrostatic film reduces abrasive wear between piston shoes and swash plate assembly.

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