I had a similar problem. There is a gear on the end of the motor that turns the gear to lift the step (all enclosed) Turns out that the gears were never greased with axle or front wheel bearing grease. Greased it with Lithium 1200a and works fine.
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2005 30' Rexhall Vision, W-22 chassis, 19.5 tires, 208'' factory WB, 6000 CCC
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