The LiftMaster 11-9030 Limit Shaft is a replacement component for LiftMaster commercial door operators in the H (Hoist), J (Jackshaft), and T (Trolley) families. This shaft interfaces with the operator’s limit switch assembly, rotating to drive the open and close cams so the door stops at the correct travel limits. Replacing a worn or damaged limit shaft restores reliable limit control and helps ensure consistent door positioning on sectional overhead doors, rolling steel doors, and grilles commonly powered by LiftMaster H, J, and T series operators.
Installed within the limit mechanism of the operator, the 11-9030 Limit Shaft is used during setup and service to calibrate door travel. After installation, the open and close limits must be reset per the operator’s manual. For safety, disconnect power and follow lockout/tagout procedures; service should be performed by qualified personnel and in accordance with applicable standards such as UL 325. Confirm compatibility with your specific LiftMaster H, J, or T model by referencing the operator’s parts diagram or service documentation before ordering this replacement part.