LiftMaster Commercial Operator Model 3900, 24V DC *DISCONTINUED*

This item is obsolete and is no longer available for purchase.


Product Description

LiftMaster Light Duty Jackshaft Operator

DISCONTINUED, replaced with model OCOM-LJ8900W-LM.

  • The Model 3900 is designed for use on light-duty commercial standard and high lift (5 ft. high lift max) sectional doors. Maximum recommended duty cycle: 10 cycles per hour
  • Heavy duty 24V DC motor provides ultra quiet operation, along with variable speed smooth start and stop
  • 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)
  • Cable tension monitor eliminates cable throw and will reverse the door when excessive slack is detected
  • Provides easy, emergency manual operation using a readily accessible disconnect
  • Accept up to 20 remote controls and unlimited DIP switch remote control with our Security+ radio technology
  • Protector System Safety Photo Cells
  • 2 year warranty

  • Note: Over the Road freight charges apply.


This item is obsolete and is no longer available for purchase.

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IMPORTANT NOTE REGARDING LOCAL PICKUPS: DDM is considered a life-sustaining company because we are an internet retail company that provides essential products. Due to the recent outbreak of Coronavirus, however, we are changing our local order pickup policy at our West Chicago location. To pick up an order you will need to order first. The quickest way is to order in advance through our online shopping cart. There you can select the local pickup option. Or, you can call 630-293-1337 for assistance, to confirm availability of parts, and to place your order. Once ordered, your parts will be available for pickup in the lobby of our north side front entrance. Longer items will be picked up on the south side loading dock. Please honor the six foot social distancing rule. Thank you for your patience and understanding as we all navigate this challenge together. More information is available on our blog titled DDM Adjusts to the COVID-19 Coronavirus. In the same article you will also find documentation and an answer to the question: "Is a garage door repair company a life sustaining business?"