The document provides instructions for disassembling and assembling the piston pump (hydrostatic) of a 256C Skid Steer Loader. The disassembly procedure involves removing components like valves, coils, cartridges, seals and O-rings. The assembly procedure instructs to install these components in the reverse order and apply thread lock compound and heat bearings during assembly. Precise measurements are required to center the swashplate.