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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