Jackshaft Operators

Commercial garage door openers - Liftmaster LGJ

LIFTMASTER MODEL LGJ

Model LGJ is a light-duty gear-reduced jackshaft operator for rolling grilles and shutters. It features an internal door lock sensing circuit, a compact design and a floor level disconnect.

  • Motor: Powerful 1/4 HP, 115V single phase motor with instant reverse and internal automatic reset thermal overload. Removable without affecting limit switch settings.
  • Wiring Type: The Model LGJ is easily wired for C2 or B2 wiring. The operator is pre-wired to accept a sensing device, photoelectric control, radio controls and most types of access control equipment.
  • Operator/Motor Control: Solid State Circuit (G2) with Door Lock Sensing Circuit (NEMA 1 enclosure).
  • Control Circuit: 24V NEC Class 2.
  • Floor Level Disconnect: Floor level disconnect provides emergency manual operation.
  • Drive Reduction: Heavy-duty wormgear-in-oil-bath speed reducer.
  • Push Button Station: 3-button station for OPEN/CLOSE/STOP functions is standard for all operators. Controls with one, two and three buttons are available.
  • Construction: NEMA 1 Type electrical box with durable baked-on powder coat finish. Easily converted for right or left mounting.
  • Warranty: 2-year warranty
Commercial garage door openers - Liftmaster MJ

LIFTMASTER MODEL MJ

Model MJ is a Medium Duty Logic jackshaft operator. It features a compact design, an adjustable friction clutch, a standard solenoid brake and a high-starting torque motor.

  • Motor: Powerful 1/2 HP, 115V single phase motor with instant reverse and internal automatic reset thermal overload. Removable without affecting limit switch settings.
  • Operator/Motor Control: Solid-state Medium-Duty circuit board.
  • Control Circuit: 24V NEC Class 2.
  • Floor Level Disconnect: Floor level disconnect provides emergency manual operation.
  • Brake: Heavy-duty solenoid actuated brake standard.
  • Drive Reduction: First stage heavy-duty 4L V-belt; second stage and third stages #48 chain.
  • Construction: NEMA 1 Type electrical box, heavy-duty 11-gauge steel frame with durable baked-on powder coat finish, all reduction sprockets drilled and pinned to shafts.
  • Friction Clutch: Adjustable friction clutch helps protect against major damage to door and operator should the door meet an obstruction.
  • Radio Receiver: 315MHz radio receiver is integral to the Medium-Duty logic board. Accepts up to 20 Security+® remote controls and unlimited DIP switch remote controls.
  • Warranty: 2-year warranty.
Commercial garage door openers - Liftmaster MGJ

LIFTMASTER MODEL MGJ

Model MGJ is a Medium-Duty Logic gear-reduced jackshaft operator for rolling grilles and shutters. It features a compact design, a floor level disconnect, a high-starting torque motor and a heavy-duty wormgear reducer.

  • Motor: Powerful 1/2 HP, single phase motor with instant reverse and internal automatic reset thermal overload. Removable without affecting limit switch settings.
  • Operator/Motor Control: Solid-state Medium-Duty circuit board.
  • Control Circuit: 24V NEC Class 2.
  • Floor Level Disconnect: Floor level disconnect provides emergency manual operation.
  • Drive Reduction: Heavy-duty wormgear-in-oil-bath speed reducer.
  • Push Button Station: 3-button station for OPEN/CLOSE/STOP functions is standard for all operators. Controls with 1, 2 and 3 buttons are available.
  • Construction: NEMA 1 type electrical box with baked-on powder coat finish. Easily field converted for right or left mounting.
  • Radio Receiver: 315MHz radio receiver is integral to the Medium-Duty logic board. Accepts up to 20 Security+® remote controls and unlimited DIP switch remote controls.
  • Warranty: 2-year warranty.
Commercial garage door openers - Liftmaster 3900

LIFTMASTER MODEL 3900

Model 3900 is a light-duty jackshaft operator for light-duty commercial sectional applications only. It features a compact design ideal for limited height, cathedral, or obstructed ceiling installations. It may be used on standard and high-lift (maximum 7 ft. high-lift) sectional doors measuring up to 14 ft. high and up to 18 ft. wide, but not exceeding 180 sq. ft. or 650 lbs.

  • Motor: Heavy-duty 24VDC motor provides ultra-quiet operation, along with variable speed smooth start and stop.
  • Compact Design: Ideal for limited height, cathedral, or obstructed ceiling installations; mounts on the left or right side of door and attaches to the torsion bar.
  • Push Button Station: 1-button station for OPEN & CLOSE functions with type B2 control wiring is standard for all operators. Controls with 1, 2 and 3 buttons are available.
  • The Protector System® Safety Sensors: A "non-contact" photo safety sensor designed to sense an obstruction and signal the door operator to reverse to open.
  • Warranty: Lifetime motor warranty.
Commercial garage door openers - Liftmaster 3950

LIFTMASTER MODEL 3950

Model 3950 is a jackshaft operator for commercial rolling sheet door applications – ideal for self-storage facilities. It features a compact design ideal for public, boat, and RV storage facilities. It may be used on commercial rolling sheet doors with live or dead shaft measuring up to 12 ft. high and up to 14 ft. wide, but not exceeding 650 lbs.

  • Motor: Heavy-duty 24VDC motor provides ultra-quiet operation, along with variable speed smooth start and stop.
  • Installation Flexibility: Comes standard with both live and dead shaft sprocketing.
  • Push Button Station: 1 APBS1 single push button station for OPEN & CLOSE functions with type B2 control wiring is standard for all operators. Controls with 1, 2 and 3 buttons are available.
  • Compact Design: Wall-mount installation – mounts on left or right side of door using standard mounting brackets. An optional mounting bracket, 3950MB (see below), provides additional mounting flexibility either inside or outside the door opening.
  • Installation Flexibility: Comes standard with both live and dead shaft sprocketing.
  • Push Button Station: 1 APBS1 single push button station for OPEN & CLOSE functions with type B2 control wiring is standard for all operators. Controls with 1, 2 and 3 buttons are available.
  • The Protector System® Safety Sensors: A "non-contact" photo safety sensor designed to sense an obstruction and signal the door operator to reverse to open.
  • Warranty: 2-year warranty.
Commercial garage door openers - Liftmaster J

LIFTMASTER MODEL J

Jackshaft (J) style commercial door operators are optimal for industrial applications. Doors used with this operator should be balanced with the ability to be manually lifted by hand in an emergency or power outage. The operators are typically mounted to the wall when used with smaller sectional overhead doors with a vertical or high lift and mounted to the wall or the front of the hood when used with rolling doors and grilles. J operators are attached to the door jackshaft to indirectly drive the door.

  • DUAL VOLTAGE CONNECTIONS
  • FLOOR LEVEL DISCONNECT
  • CONTROL FUNCTION SELECTOR DIAL
  • TIMER-TO-CLOSE
  • CONTINUOUS-DUTY HIGH-STARTING TORQUE MOTOR
  • MOTOR REMOVABLE WITHOUT AFFECTING LIMIT SWITCH SETTINGS
  • ADJUSTABLE FRICTION CLUTCH
  • MID-STOP
  • MAXIMUM RUN TIMER
  • DELAY-ON-REVERSE CIRCUIT
  • 3-BUTTON CONTROL STATION WITH MAINTENANCE ALERT SYSTEM (MAS)
Commercial garage door openers - Liftmaster DJ

LIFTMASTER MODEL DJ

Door Lock Jackshaft (DJ) style commercial door operators are ideal for shopping mall applications with lighter rolling doors and grilles. Doors used with this operator should be balanced with the ability to be manually lifted by hand in an emergency or power outage. These operators include a door lock sensor to prevent damage to the door and operator caused by attempts to automatically open a locked door. The operators are typically mounted to the wall when used with smaller sectional overhead doors with vertical or high lift and mounted to the side, or the front of the hood, when used with rolling doors and grilles. DJ operators are attached to the door jackshaft to indirectly drive the door.

  • DUAL VOLTAGE CONNECTIONS
  • INTERNAL DOOR LOCK SENSOR
  • FLOOR LEVEL DISCONNECT
  • CONTROL FUNCTION SELECTOR DIAL
  • TIMER-TO-CLOSE
  • CONTINUOUS-DUTY HIGH-STARTING TORQUE MOTOR
  • MOTOR REMOVABLE WITHOUT AFFECTING LIMIT SWITCH SETTINGS
  • ADJUSTABLE FRICTION CLUTCH
  • MID-STOP
  • MAXIMUM RUN TIMER
  • DELAY-ON-REVERSE CIRCUIT

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