A method of operating a hydraulic pump to provide fluid to a hydraulic tool for performing a work operation on a workpiece includes operating a high-flow piston to supply fluid from a tank to a work port via a first flow path and operating a high-pressure piston to supply fluid from the tank to the work port via a second flow path. An unloading valve is actuated to selectively couple the first flow path and the second flow path based on a first threshold pressure. An end of the work operation is determined based on a second threshold pressure.