KYB PSV2-55T Tandem Hydraulic Piston Pump Aftermarket Repair Part For Construction Machinery Product Description: The KYB PSV2-55T is a tandem variable-displacement piston pump widely used in compact hydraulic excavators and other construction machinery. The suffix "T" stands for "Tandem" (indicating a dual-pump configuration), enabling the delivery of independent and ample hydraulic power within a compact footprint to operate the excavator's left and right travel systems,