Model MT
Medium-Duty Trolley Operator
for Standard Lift-Sectional Doors

Standard Features:

• Motor:
  Powerful 1/2 HP, single phase motor with instant reverse and internal automatic reset thermal overload. Removable without affecting limit switch settings.
• Auxiliary Reversal System:
  Designed to protect the door and door operator from damage; if a closing door strikes an obstruction, the Auxiliary Reversal System will detect the slip of the clutch and reverse the door to the full open position.  This system is not a substitute for a safety sending device such as a photo cell or reversing edge.
• Wiring Type:
  All operators are factory preset to C2 wiring providing momentary contact to open and stop, with constant contact to close.  Momentary contact to close (B2 wiring) can be easily set. The operator is pre-wired to accept a sensing device, photoelectric control, radio controls and most types of access control equipment.
• Rail Assembly:
  High strength dual L-rail track with exclusive nylon quiet gliding chain guides on rail spacers for quiet, smooth operation.  Includes quick-mount header bracket which provides fast, swing-up installation.
• Operator/Motor Control:
  Dependable dual relay system (NEMA 1 enclosure).
• Control Circuit:
  24V NEC Class 2.
• Drive Reduction:
  First stage heavy-duty 4L V-belt; second and third stages #48 chain; output on trolley #48 chain.
• Emergency Disconnect:
  Spring-loaded disconnect for emergency manual operation.
• Pushbutton Station:
  3-button station for OPEN/CLOSE/STOP functions is standard for all operators.  Controls with on, two and three buttons are available.
• Construction:
  NEMA 1 type electrical box, heavy-duty 11-gauge steel frame with baked-on powder coat finish, all reduction sprockets drilled and pinned to shafts.
• Bearings:
  Heavy-duty, oil filled bearings.
• External Radio Control Terminal:
  External terminals provide quick, convenient connections for universal radio controls.
• Friction Clutch:
  Adjustable friction clutch helps protect against damage to the door and operator should the door meet an obstruction.  Works in conjunction with the Auxiliary Reversal System.

Clearance and Mounting Details

Click above image to enlarge

If you would like more information on LiftMaster Products, please email us or complete our "Request Information" form.