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Thrust Plate Pressure Plate

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The pump has (top to bottom) the thrust plate, pressure plate, ring and rotor with vanes, and then the driveshaft that is keyed into both the rotor and the beltdriven pulley. On the left is the original assembly and the larger parts on the right will increase the oil volume to help with the ram as well as boosting the volume at low engine rpm. This is helpful in rockcrawling since turning big tires requires extra fluid even though the engine is at low rpm.