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Factory Replacement 6251511001 Oil Pump Heavy Duty Construction Machinery 6D125 Diesel Engine Lubricating Oil Pump. Perfect OEM Direct Replacement, 1:1 Interchangeable Strictly follows original OEM dimension & mounting standard of 6251511001 pump, identical flange, spline shaft, oil port layout. 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.