The Rotation Chamber Bushing (OEM Part No. 3128310276) is a bearing spare part compatible with the Simba M4C underground drilling rig. Manufactured from alloy bronze, it is designed for the rotation chamber assembly wear bushing position. The bushing reduces friction between moving components, supports smooth rotation movement, and improves mechanical stability during drilling operations. Its wear-resistant bronze construction provides reliable performance under continuous load and harsh underground mining conditions. This OEM replacement bushing ensures accurate fitting, extended service life, and improved efficiency of the rotation chamber assembly.