The ball-shaped cup coded K 28041 is a key interface element in the rocker arm assembly of the ZV40/48 diesel engine. Designed to provide a smooth contact surface between the pushrod or adjustment screw and the rocker arm, it accommodates slight angular movements while minimizing friction and wear. Its spherical shape allows for even distribution of force, reducing stress concentrations and extending component life. Precision-manufactured from hardened materials, this cup ensures quiet, smooth rocker arm operation and contributes to the longevity of the valve gear system.