The Hydraulic Cylinder (OEM Part No. 3128321900) is a spare part compatible with Boomer 291, Boomer 281, and Boomer-282 underground drilling rigs. Manufactured from high-strength alloy steel, it is categorized as a hydraulic component used in the hydraulic actuation system at the boom movement position. This cylinder converts hydraulic pressure into controlled mechanical motion, providing precise boom positioning and reliable force transmission during drilling operations. Designed for heavy-duty mining environments, it delivers stable hydraulic performance, high durability, and long service life, helping maintain smooth operation and productivity of underground drilling equipment.