Official Factory Schematic
Humminbird HDR400_GI
Schematic & Maintenance Notes for Humminbird HDR400_GI
This official exploded parts diagram illustrates the internal assembly and factory key numbers for the Humminbird HDR400_GI. Use the schematic to identify worn drive gears, pinions, drag stacks, anti-reverse pawls, line rollers, and spool bearings.
1. Find Your Key Number
Cross-reference the circled key number on the diagram with the factory parts list.
2. Order Replacement Parts
Search the corresponding OEM part number on Mike's Reel Repair for genuine factory stock.
3. Clean & Lubricate
Use specialized low-viscosity spool oil on bearings and PTFE reel grease on gears.