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Excavator Hydraulic Pump A10vno 45drs52L-Vrc12h00-S4558 Axial Piston Variable. Perfect OEM Direct Replacement, 1:1 Interchangeable Strictly follows original OEM dimension & mounting standard of A10VNO 45DRS52L-VRC12H00-S4558, identical flange, spline shaft, oil port layout; dire. Heavy-duty Wear-resistant Core Components, Ultra-long Service Life Key parts (plunger, retainer, distribution plate) adopt carburizing quenching alloy steel + copper alloy, high wear & impact resistan. Stable Variable Control & Low Noise Operation Optimized swashplate variable structure, stepless flow adjustment following load demand, stable hydraulic output with no surge pressure; precision fit red.