Hydroboost Plumbing Diagram - 1999 Superduty Booster, Saginaw Pump, -6AN Fittings

This document is a color-coded plumbing schematic for a hydroboost power brake/steering conversion. It illustrates the hydraulic line routing between a Saginaw power steering pump (labeled "Saginaw box" near the pump/reservoir at lower left), a 1999 Superduty hydroboost unit mounted behind the steering column, a steering gear box labeled "4x4x2 Box," and a fluid cooler at the lower right. Three hose colors trace the circuit: red (high-pressure supply from the pump to the hydroboost and on to the steering box), green (a second pressure/return path between the hydroboost, steering box area, and pump reservoir), and blue (low-pressure return line routed through the cooler back to the reservoir). Each port is called out with its thread size and the adapter fitting part number needed to convert it to -6AN: 18mm x 1.5 uses FBM2609, 16mm x 1.5 uses FBM2608, 5/8-18" ports (on both the pump and steering box) use FBM2694, and the 1/2-20" port uses FBM2963. A reader can learn which AN adapter fittings to buy for each port and how to route the hoses when installing a 1999 Superduty hydroboost with a Saginaw pump and 4x4x2 steering box.