Mack 8813-387481 Steering Pump Shaft Assembly

Mack 8813-387481 Steering Pump Shaft Assembly is a replacement shaft component identified by part number 8813-387481, linked to the 387481 Vickers Steering Pump Shaft in Mack truck hydraulic steering systems. Within the steering pump, the shaft serves as the drive element that transmits rotational motion from the pump input toward the pump internals, enabling the hydraulic pressure needed to provide steering assist. The 8813-387481 designation uniquely identifies this Vickers-based shaft configuration, supporting precise identification for maintenance, repair, or overhaul of compatible Mack truck steering pump assemblies that rely on the 387481 shaft family. Correct installation and alignment of this shaft are essential for reliable hydraulic performance and consistent steering feel, making exact-part replacements critical for maintaining serviceable steering systems in affected Mack vehicles and minimizing downtime during repairs. It is used within the Mack and Vickers pump lineage, where the correct shaft tolerances and surface finish contribute to smooth operation and long service life.