1. The document provides instructions for disassembling and assembling a piston pump used in a hydraulic excavator fan.
2. The disassembly process involves using various tools to remove over 30 individual parts from the pump in sequential order.
3. Reassembly requires carefully installing each part in reverse order, ensuring proper placement of seals, bearings, springs and other components.
4. Cleanliness is emphasized throughout to prevent contamination during assembly.