Abstract: A method of extending a jack including the steps of: first stage pumping by passing pressurized fluid at a first pressure and a first volume to a jack cylinder primarily by movement of a piston; and second stage pumping by passing pressurized fluid at a second pressure and a second volume to the jack cylinder primarily by movement of a rod connected to the piston.

Abstract: A hydraulic jack includes a frame and a pump connected to the frame. The pump is connected to the frame. The pump includes a rod, a housing, and a piston, with hydraulic fluid being in the housing. The rod has a cross-sectional area and has a longitudinal axis. The housing has an end through which the rod slides and has an interior wall. The piston is coupled to the rod. The piston establishing a rod side chamber and a piston side chamber within the housing. The piston having a plurality of biased check valves fluidically coupling the rod side chamber with the piston side chamber.