Being it works good in one direction I would think the motor. On mine it is a reversible motor. There are also 2 sprockets that run the chain. If the pin is sheared on one that would cause the problem. you can remove the panel above the bed a watch everything. Around 2015 they started using a different vendor that they say is a better unit.
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Dennis & Linda Ward
Paola, Kansas
Montana 3735MK Legacy Edition
1200 watts of Solar
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