2719-328344
King Pin Set
Mack

A worn king pin set compromises steering geometry and axle alignment on heavy‑duty trucks. This assembly governs the pivot point between the steering knuckle and axle, absorbing vertical and lateral loads while allowing controlled articulation. Replacing the set restores proper camber and caster, reduces steering looseness, and minimizes tire wear caused by wandering or misalignment. The components are manufactured for durability in harsh road conditions, with hardened pins and closely matched bushings designed to resist pitting from grit and road salt. When installed with fresh bushings, you gain smoother steering response, improved feedback, and longer life for the knuckle, tie rods, and associated steering hardware. Regular inspection and proper lubrication are essential; inadequate lubrication or contaminated seals accelerate wear and can cause binding during steering maneuvers. Verify compatibility with your axle model and ensure correct pin diameter and mounting pattern before installation. Correct torque on mounting hardware and proper seal alignment help maintain contaminant exclusion and fluid retention in the knuckle area. For best results and ongoing support, consult Source One Parts Center for fitment guidance and maintenance recommendations.