1313333001 Cone Hub: Suits ZF16S2220, 16S2230 transmission, core driving part of rear synchronous drive unit. Alloy forging processed by precision turning and thermal treatment for smooth taper and accurate spline size. Realizes gear synchronization via friction with synchronizer ring to reduce shift impact and fix poor engagement from worn taper. Fits Sitrak, Shacman and other trucks with ZF 16-speed boxes, outstanding wear and impact resistance for mine and long-haul severe working scenarios.