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  1. #1
    Rolling Along cfowler55's Avatar
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    Pin box deflection

    So , I have had some squeaking noise I thought was due to the RotaFlex pin box. When we got home from our latest trip , I decided to measure how much movement there is in the pin box from loaded to unloaded. My preliminary measurements came up with 5/8” from the front of the box to a marked spot on the cap. My question is , is this too much?
    Thanks , Charlie
    Vickie & Charlie
    2019 310GK-R
    2020 RAM Longhorn DRW Cummins /Aisin

  2. #2
    Rolling Along
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    That's a good question and one I would ask Grand Design about.

    Full-time Traveling Family ,'21 Momentum 395MS-R, '21 F450 King, 2000watts solar, Dual Victron MP-II 12/3000 2 x 120v, 1220ah LiFePo4

  3. #3
    Big Traveler
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    On a previous brand trailer, up to a half inch was the max allowable deflection. More than half would indicate a broken weld or crack.
    Agree with Yankee, get on the phone with GD
    2018 Dodge 3500 6.7 Cummins SRW w/Aisin
    2021 Reflection 303RLS
    New to RV'ing since 1997

  4. #4
    Site Sponsor JCR GD's Avatar
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    FYI Lippert info. Change should not be more than 1/4" - 1/2" (according to Lippert)
    Click image for larger version. 

Name:	UD Flex Guide.pdf 
Views:	95 
Size:	97.1 KB 
ID:	40379
    Last edited by JCR GD; 05-03-2022 at 08:15 AM.
    Jim (& Sharon)
    2015 GD Momentum 385TH - SOLD
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    2017 RZR XP 1000 EPS SE

  5. #5
    Rolling Along cfowler55's Avatar
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    Quote Originally Posted by JCR GD View Post
    FYI Lippert info. Change should not be more than 1/4" - 1/2" (according to Lippert)
    Click image for larger version. 

Name:	UD Flex Guide.pdf 
Views:	95 
Size:	97.1 KB 
ID:	40379
    Thanks for this info and diagram. I did take the rotating portion on the box apart today and cleaned and lubed it really well. Maybe that will cure the squeaking. Plan is to wash 30 days on the road off of the exterior tomorrow. Did roof today. Then I’ll move it to the garage and measure following the diagram.
    Charlie
    Vickie & Charlie
    2019 310GK-R
    2020 RAM Longhorn DRW Cummins /Aisin

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