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Hi! My name is ***** ***** I can assist you with this. I may need some additional information from you first in order to give a complete answer.
Is this a Popup trailer?
I am not aware of any chain that has to do with the leveling legs. These are gear driven. And there are no "safety levers" on these. If the gears and pins are intact the leveling legs should move. They are slow and the movement may be almost not noticeable. It takes a lot of cranking to move this up and down.
It may help if you can attach a photo of the area in question so I can see what part he may me talking about here. Use the paperclip Icon. All follow ups are included in our fee. The pins are those that hold the gears to the shaft. If those shear, then the gears just spin on the shaft and nothing happens.
Just checking back in to see if you were able to resolve this issue or do you still need some additional input from me here?
Thanks for letting me know..........get back to me if you need more later and thanks for bringing your question to Just Answer.
FYI.........Stromberg-Carlson make a complete replacement system for about $575 or you can upgrade to Bulldog individual motor units that are heavy duty for about $800.