The Sensor Set (OEM Part No. 3128314772) is a replacement electrical sensing assembly designed for position detection and limit-switch control in underground drilling equipment. It is compatible with selected Epiroc / Atlas Copco models, including Boomer 104, Boomer K41, Boomer M1D, Boomer S2, Simba H1257 and Simba S7D. The 3128314772 Sensor Set works with the machine control system to detect component position and support reliable limit-switch functions during equipment operation. It is suitable for routine maintenance and replacement when the existing sensor assembly becomes damaged, faulty or no longer provides reliable position feedback. The 3128314772 Sensor Set helps maintain stable control-system performance and reliable drilling equipment operation.