The document provides instructions for disassembling and assembling the main hydraulic pump on a M317D2 Wheeled Excavator. It lists 34 steps for disassembly, including removing bolts, valves, pistons, springs, and other components. It then lists 36 steps for reassembly, instructing technicians to clean parts, apply threadlock, and reinstall components in reverse order of disassembly using the provided tools. Technicians are advised to mark parts for orientation during reassembly to prevent mixing of components.