The LiftMaster K39-10167 Clutch Disc is a genuine OEM replacement component for select LiftMaster medium-duty commercial door operators. Installed within the operator’s clutch assembly, it provides controlled slip to protect the motor and door system from overload by allowing the drive to give way when an obstruction or excessive resistance is encountered. This replacement disc helps restore smooth, reliable operation and proper overload protection on units that show signs of clutch glazing, chatter, or inconsistent slip.
Commonly used on LiftMaster medium-duty MJ (jackshaft), MH (hoist), and MT (trolley) operators, the K39-10167 supports a wide range of commercial and light industrial applications where dependable clutch performance is required. For installation, disconnect power and follow the operator’s service manual to access the clutch assembly, replace the worn disc, and reassemble. After installation, adjust the clutch per LiftMaster specifications so it slips only under abnormal load. Always use lockout/tagout practices and verify compatibility with your exact operator model and part diagram before ordering.