The motor is a pump and it pushes hydraulic fluid into the jacks after the controller board electrically opens the valves in each jack hydraulic line. It may be the controller did not open the valves or tried but was unsuccessful. It would be rare for all the valves to go bad at once, but maybe a control wire broke or power was lost.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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