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Make sure you reinstalled the segmented wheel on the motor shaft correctly, position does not matter but it must be fully seated on the shaft so the sensor portion reads the segments. The segmented wheel is part of the RPM sensor, it confirms rotation of the motor and without it the opener thinks it is jammed, it will travel a few inches, reverse, travel a few inches and stop.

Also check any wiring inside that you may have taken loose, it is easy to forget to plug things back in, also many of the plugs just fit over pins and can easily be installed one pin off leaving one pin outside the connector.
 
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