The LiftMaster MGJ Medium-Duty Gear-Reduced Jackshaft Operator is designed for commercial applications that require a gear-reduced drive system for reliable and controlled operation.

This model is ideal for rolling steel doors, grilles, shutters, and high or vertical-lift sectional overhead doors used in medium-duty environments. With a maximum of 12 cycles per hour and up to 50 cycles per day, the MGJ delivers consistent performance while maintaining durability and safety.

The floor-level emergency disconnect allows manual operation during power outages or emergencies. 

Key Features

• Gear-reduced jackshaft operator for medium-duty commercial use

• Suitable for rolling steel doors, grilles, shutters, and sectional overhead doors

• Rated duty cycle: up to 12 cycles per hour / 50 cycles per day

• Wall-mounted design

• Floor-level emergency disconnect for manual operation

• Solid-state medium-duty logic control board

• Programmable timer-to-close (5–60 seconds)

• 3-button control station (Open / Close / Stop) 

Specifications

• Radio receiver: Security+Ⓡ  315 MHz

• Voltage: Single-phase 115V

• Control circuit: 24V NEC Class 2

• Drive reduction: Sealed roller bearings in gear reducer

• Construction: NEMA 1 electrical box, heavy-duty 11-gauge steel frame with powder-coated finish

• Warranty: 2 years 

Installation Features

• Universal mounting: Yes

• Maximum door height: 14 ft standard (additional capability available)

• Maximum door width: 22 ft

• Maximum allowable door area: 320 sq. ft.

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Price available upon request. Contact us for a custom quote.