The Hydraulic Cylinder (OEM Part No. 3128309386) is a spare part compatible with F9-11, S7D, ROC-D7-11, ROC-D9-11, and S7D-1 underground drilling rigs. Manufactured from high-quality steel, it is designed as a hydraulic component for the hydraulic cylinder assembly position in hydraulic control and actuation systems. The hydraulic cylinder converts hydraulic pressure into linear mechanical movement, providing precise control, positioning, and operational support for drilling equipment. Its durable construction ensures reliable performance, high load capability, and long service life under demanding mining and tunneling conditions. This OEM replacement hydraulic cylinder helps maintain efficient and stable drilling operations.