Scissor jacks unscrewing

Discussion in 'General Camper Setup / Take Down' started by JimmyM, Jun 26, 2017.

  1. tombiasi

    tombiasi Well-Known Member

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    I didn't mean for you to get your shorts in a bunch it's just a claim like that has to have questions asked.
     
  2. JimmyM

    JimmyM Well-Known Member

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    Agreed. I think it stems from the "nut end" having a roller thrust bearing.
    I got a quick video of it. It's definitely backing out. Slower this time.
     
  3. tombiasi

    tombiasi Well-Known Member

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    Damn! I have never seen that in my life. The thread shouldn't allow this. Did someone replace the threaded shaft?
     
  4. JimmyM

    JimmyM Well-Known Member

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    I know! Right? Completely agree with you. Sooo messed up. They're factory screw jacks. Only lubed by me. That's it. Last year, it would spin back quicker, but still...
    I know it only happens when the ground and camper are close together due to the angle of the arms vs. screw. But it shouldn't do it in ANY case. There's a relationship between the pitch angle of the screw and coefficient of drag between the nut and screw. But I find it hard to believe that the screw/nut interface is THAT friction free.
    But there's no doubt it's happening.

    If anyone is interested in what lube I used... Lith-ease grease stick.
    https://www.amazon.com/gp/product/B000Q6JUB8/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
     
  5. giadiep

    giadiep Active Member

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    Just hit it with a can of brake cleaner, then see if it holds. Brake cleaner should remove the grease.
     
    Last edited: Feb 26, 2018
  6. JimmyM

    JimmyM Well-Known Member

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    That's what I was hoping.
     
  7. tombiasi

    tombiasi Well-Known Member

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    If you determine that the lube was causing this I'm buying some of that immediately.
     
  8. mstrbill

    mstrbill Active Member

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    I thought Silicone spray was the lube of choice for the stabilizers. Prevents dirt from building up on the screws.
     
  9. crackerJack

    crackerJack Well-Known Member

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    Crazy......idk
     
  10. Haybale

    Haybale I'd rather be camping!!

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    To much lube on the screw...

    Brake cleaner should be fine to clear it. Or simply put a little bend in the screw...
     
  11. JimmyM

    JimmyM Well-Known Member

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    I don't think I'm emotionally or psychologically capable of bending the screw to stop it from unscrewing. [:P]
     
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  12. ezakoske

    ezakoske Active Member

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    I'd just replace them if degreasing them doesn't do the trick.
     
  13. FarmerDave

    FarmerDave Active Member

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    Had the exact same thing happen with a TT. You could see the screw winding backwards with weight on it. Wasn't my trailer so I don't know how it got solved.
     
  14. Rusty2192

    Rusty2192 Well-Known Member

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    1C3E9A62-491F-445D-81AF-7B0733CE6B06.jpeg
     
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  15. Joeman55

    Joeman55 New Member

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  16. Joeman55

    Joeman55 New Member

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    I'm trying to get all that white lithum off my rear Jayco screw jacks. They both spin back down once I take the jack handle off.
     
  17. RollTideRick

    RollTideRick Member

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    These locks are available... Screenshot_2018-08-16-17-03-58.png
     
  18. WrkrBee

    WrkrBee Well-Known Member

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    A screw is nothing more than a wedge wrapped around a rod. The pitch of the screw is the same as the angle of the wedge. If you reduce the friction on the top and bottom of the wedge and the downward force generates enough force to create the needed 90 degree force, from the angle of the wedge, the wedge will move (or the screw will turn).
     
  19. RollTideRick

    RollTideRick Member

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    Dedicated my life to building hotrods and working in the Collision Repair Industry, I have possibly used every jack invented. I think Air Bags would be awesome on my Pup but the wife said "Enough of all of the gadgets"
    WrkrBee that's what I was going to say!
     
  20. Sjm9911

    Sjm9911 Well-Known Member

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    To be honest , I'm pretty mechanical , and have no clue as to what that means.
     

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