The document provides instructions for removing and installing a piston pump on a 257D Multi Terrain Loader. It lists required tools and outlines 34 steps to disassemble the pump, including removing valves, cartridges, seals and bearings. It then describes 27 steps to reassemble the pump, starting with pressing bearings back into place and ending by torquing the housing bolts. Diagrams illustrate each step for clear guidance on the pump assembly and disassembly process.