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TOPIC: Flexair Pinbox Rubber Plate Slipping

Flexair Pinbox Rubber Plate Slipping 2 weeks 2 days ago #1

A short time ago I saw some posting on the rubber plate slipping and how Lippert was very concerned and was quickly willing to replace it. I have attached a couple photos to verify my understanding of the slipping phenomena.

I wasn't able to edit the orientation of the photos, so please do the best you can.
How serious is this issue? Is it so bad as not to tow the trailer? I personally don't think so.
Thanks for the help.

Steve Blomquist
2017 3401RL
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Flexair Pinbox Rubber Plate Slipping 2 weeks 2 days ago #2

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Lippert replaced my original failed TriGlide with a Flex Air. After the first 80 mile trip the rubber insert rotated about 20 degrees. I called Lippert and they insisted on replacing the complete hitch.
The new FlexAir had the same problem. So now I use a three pound hammer and a block of wood when necessary to re-position the rubber block. Probably now have 20000 miles since replacement and no problems. Needs adjustment about every 2500 miles.
I was told that the rubber block is held in place by compression (about 100psi) in assembly. My buddy had the same problem and used his tractor bucket to compress the rubber block to disassemble the lower pivoting jaw. He then glued the rubber in place, reassembled and no more problem. Get a hammer and wooden block and don't worry about it too much!

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2012 RW31SL chasing 2013 GMC 2500HD Duramax 4WD SRW

North Left Coast, WA

Flexair Pinbox Rubber Plate Slipping 2 weeks 1 day ago #3

Thanks for taking the time to post. I agree this isn't an immediate problem. If the rubber plate were to migrate and depart the hitch entirely the pin would be free to rotate until it hit the lower jaw. It would make a lot of racket but and it would need to be replaced ASAP but still vigilance is key.

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