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Did you ever hand crank the jack when the battery was disconnected?
If so, the shaft might no longer be in sync with the limit switches. That would cause the shaft to jam in the tube so tight that is can't be adjusted up/down any more, and the non-metal gears may be stripped. I had that problem and called H&H Engineering. They fixed it under warranty. If possible check your Jack's service manual or look it up on-line.
Very important that the "timing" or "Sync" is maintained between the shaft and limit switches. And the instructions don't stress this fact enough.
Good Luck & Let us know the cause and the solution.
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