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Ampflow motor

We recently encountered a strange issue with a 4QD-300 driving an Ampflow A28-400-F24 motor.

Forward operation worked as expected but in reverse a very slight pulsing or oscillation of the motor speed could be detected at throttle openings between 10% and 20% with no load.

This problem only appeared when half speed reverse was enabled, it could be cured by removing the half speed reverse link.