LiftMaster MH

liftmaster mh opener


The Model MH is a medium-duty hoist operator, as manufactured by The Chamberlain Group, Inc. and is for use on vertical or high lift sectional doors or small rolling doors and grilles. It is rated for 12 cycles per hour during peak periods up to 50 cycles/day.



    • Drive system : chain hoist


    • Voltage/phase : 115 V/1 ph


    • Horse power : ½ h.p.


    • Minimum sideroom required: 18″


    • Solid-state Medium-Duty Logic circuit board.


    • High-starting torque operator with instant reverse.


    • Capacitor start on single-phase.


    • Motor is removable without affecting limit switch settings.


    • Heavy-duty solenoid brake


    • First-stage heavy-duty 4L V-Belt; second and third stages #48 chain.


    • Heavy-duty oil-filled bushings.


    • Adjustable friction clutch helps protect against damage to the door and operator should the door meet an obstruction.


    • Provides emergency manual operation using an electrically interlocked floor level disconnect and chain hoist mechanism.


    • Motor overload protection.


    • NEMA 1 type electrical box, heavy-duty 11-gauge steel frame with baked-on powdercoat finish, all reduction sprockets drilled and pinned to shafts.


    • Integrated Timer-to-Close (TTC) allows programming from 5 to 60 seconds in 5-second increments. Allows for timed automatic door closure after the door reaches the full open position (Requires monitored safety devices, with CPS-U, CPS-UN4, or CPS-EI).


    • Integrated 90-second maximum run timer


    • UL and CSA listed.


  • 2-year warranty.




CPS® Commercial Protector System® 

The presence of primary entrapment protection is standard CPS-U for all modes. Primary entrapment protection devices are monitored continuously to ensure safe operation of the door and limit door opener functionality should an obstruction be detected or in the event of device failure. Optional LiftMaster Monitored Entrapment Protection devices, CPS-UN4, CPS-RPEN4 and CPS-EI, are designed to work in conjunction with LiftMaster commercial door openers to provide enhanced door safety and a broad range of modes and features to end users. Either monitored photo-sensor or monitored 4-wire sensing edge (in conjunction with the CPS-EI Edge Interface) protection may be selected, but one must be detected by the LiftMaster Logic 4.0 or Medium-Duty Logic circuit board in order to unlock full functionality.



Garage doors and garage door openers can be dangerous if not installed and verified by a professional and not used properly. Children must be supervised by an adult when they are inside or in proximity of the garage.



    • LiftMaster MH door openermh operator


    • Chain Tensioner


    • 3-Button Control Station


    • 3-channel 315MHz receiver included (transmitter in option)


    • Hardware bag for installation (includes all necessary hardware for installation)


    • Hoist Chain



3-Button Open/Close/Stop Remote Control (333LM)

  • Red, yellow and green actuators for easy identification
  • Accommodates commercial operators requiring open, close and stop functions or three-channel light control
  • Easy code selection, 9-position trinary DIP switches with 19,683 changeable codes per channel
  • Red LED indicates battery strength and signals sent transmissions
  • Includes 12V battery and directional visor clip

Liftmaster Garage Door opener 333LM 3-Button Open/Close/Stop Remote Control

3-Button Remote Control 315MHz (373LM)

Our basic 3-button remote control isn’t so basic. It can operate up to 3 garage doors or gates, and/or turn your garage door opener lights on/off. You can also use it as an extra remote control to turn on lights or small appliances inside your home – all from the comfort of your car.Get additional access and security with our 3-button remote control. Use it to open and close 3 garage doors or gates, or as an extra remote to turn interior lights and small appliances on inside your home.

373lm remote

373LM LiftMaster 3-Button Remote Control

3-Button Visor Remote Control (893MAX)

This powerful multi-door control can operate up to 3 garage door openers, gate operators, or MyQ®enabled light accessories. Plus, it’s compatible with all LiftMaster® garage door openers manufactured since 1993.

3 button remote

3-Button Mini Remote Control (893LM)

Mini 3-Button Remote Control 315MHz (890MAX)

Are you always on the go? Our mini 3-button remote control is a miniature version of our 3-button remote control, and just as powerful. It can open and close 3 garage doors or gates, turn opener lights on/off, and/or turn on lights and small appliances in your home. And the best part is that it can fit almost anywhere – in your purse, your pocket, or even on your keychain.Get control on the go. Our mini 3-button remote control is small enough to fit in your purse, in your pocket, or on your keychain, and can operate 3 garage door openers or gates, or lights and small appliances.

3 button 890 max

3-Button Mini Remote (890MAX)

Wireless Keyless Entry System (877MAX)

Open or close your garage door without using a remote control or key. The LiftMaster® Wireless Keyless Entry System can open the door using a private 4-digit code you program directly into the unit. You can also program it with temporary access codes for visitors or delivery and service personnel so they can gain access to your garage without having to give them your personal code. Plus, it works with all LiftMaster® garage door openers manufactured since January 1993.

keyless 877max

Wireless Keyless Entry System (877MAX)

Wireless Keyless Entry System 315MHz (377LM)

Access your garage and home without the use of a key or a remote control. The LiftMaster® Security+® Wireless Keyless Entry can open your garage door using a code that you program directly into the unit. There is also a temporary password option that enables family, friends, or service people to enter the garage/your home without giving them your personal code.

    • Backlit keypad which makes numbers easy to see, even in the dark.
  • One-button-to-close feature makes it easier than ever to close your garage door.

877 keyless entry system

Wireless Keyless Entry System (877LM)


Commercial Protector System® (CPS-UN4)


CPS-RPEN4 Retro-Reflective Photo Eye makes installs faster and simpler, by only having wiring on one side of door and Reflector on the other. Range of 50 feet in most cases. NEMA-4 rated.

retro-reflective photo eye

Liftmaster CPS-RPEN4 Monitored Retro-Reflective Photo Eye

Sensing Edge

If CPS-U / CPS-UN4 photo sensors are present, a non-monitored 2-wire electric edge or pneumatic (air hose) edge may be used as ancillary protection devices.

(65-8202) Pneumatic Sensing Edge Kit with exterior air switch, 2-wire coil cord and 14′ air hose.

(65-5202) Pneumatic Sensing Edge Kit with exterior air switch, 2-wire  take-up reel (20′ extended) and 14′ air hose.

Rolling Door Interlock Switch

Interlock switch disables the operator control circuit when a manual door lock is engaged, preventing damage to the door and operator.

Chain tensioner

(71-6023)For 1″ shafts. Recommended to properly tension drive chain between operator shaft and door shaft.

(71-6125) Same as 71-6023, but for 1-¼” shafts.

Antenna Extension Kit

The antenna extension kit can be used with EXT-ANT for maximum radio receiver range.

86LM (15′)


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