MGJ – Medium-Duty Gear-Reduced Jackshaft Operator for Rolling Grilles and Shutters
Combining compact convenience with robust gear-driven performance, the MGJ operator is ideal for rolling grilles, shutters, and sectional doors with high or vertical lift. Its wall-mounted design frees overhead space, while the worm-gear-in-oil-bath reducer and sealed bearings ensure smooth, durable operation. Standard features include intuitive push-button controls, automatic Timer-to-Close, and UL 325 compliance.
Key Specifications
Voltage: 115 V single-phase
Drive Reduction: heavy-duty worm gear in oil bath
Duty Cycle: up to 12 cycles per hour
Control Station: configurable one- to three-button Open/Stop/Close
Programmable Timer-to-Close: 1- or 15-second increments
Security+® Technology: supports up to 20 remotes and unlimited DIP switch controls
Drive Reduction is a heavy-duty, wormgear-in-oil-bath speed reducer.
Apply Open/Close/Stop functions with the standard three-push-button control station. Controls with one, two and three buttons are available.
Receive notifications when routine maintenance is required on your Commercial Door Operator.
Improve durability with the NEMA 1 type electrical box construction with a powdercoat finish.
Sealed roller bearings in gear reducer.
Mount on the left or right side of the door. No rails to hang, the operator simply mounts on the wall and attaches to the door shaft through chain and sprocket. (3900 can mount directly to shaft)
Enable limit setting for ease of installation and adjustment to ensure accuracy even after a power failure.
Automatically close the door with Timer-To-Close (programmable in 1-second or 15-second increments).
Ensure peace of mind with a LiftMaster® two-year warranty.
