This document provides instructions for disassembling and assembling the piston pump (hydrostatic) of a 242D Skid Steer Loader. The disassembly process involves removing 34 individual components in a specific order, including valves, cartridges, seals, and housings. The assembly is then carried out in the reverse order, taking care to properly install new seals and apply thread locking compound as needed. Precise measurement and centering of parts like the swashplate is required during assembly to ensure correct functioning of the pump.