How to Adjust a LiftMaster Motor So the Belt Fits - DDM Garage Doors Blog

Posted December 11th, 2020 at 6:33 pm by Dan Musick

Customers sometimes ask if they can substitute a different v-belt for their operator. In this video, we demonstrate how to adjust a LiftMaster motor, so the belt fits properly, even if it is a different length.

If a v-belt is too tight or too loose, you can adjust the motor to get the proper fit.

Here are the steps for adjusting a LiftMaster motor so the v-belt fits properly.

  1. Unplug the power or flip the circuit breaker.
  2. Loosen the four bolts that secure the motor frame to the operator frame. Loosen the nuts just enough to allow the motor to slide.
  3. Install the new belt.
  4. Raise and lower the motor as needed for the belt to fit snugly, but not too tightly.
  5. Align the motor pulley, v-belt, and the larger clutch pulley.
  6. Level the motor.
  7. Tighten the four nuts and bolts.
  8. Restore the power and test the operator.

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PLEASE NOTE: COVID has interrupted global supply distribution chains resulting in unprecedented delays on incoming door and dock industry products. The result is limited availability of many products, three month delays on incoming shipments, and an inflationary rate of over 50% just this year on many of our products.

PLEASE NOTE: DUE TO COVID-19 SHIPPING TIMES ARE NOT GUARANTEED, EVEN ON NEXT DAY AND SECOND DAY SHIPMENTS. NORMAL TRANSIT TIMES DO NOT APPLY.

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