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Open Roads Forum  >  Fifth-Wheels

 > Pinbox moves?

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Lightning55

Pleasanton, CA

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Posted: 09/27/20 10:52am Link  |  Quote  |  Print  |  Notify Moderator

A friend has a Jayco 5th wheel that's about 4 years old and noticed that the pinbox seemed to move up and down over bumps. He couldn't remember ever noticing this before. Suspicious that something wasn't right, he raised and lowered the trailer off the truck and measured that the pinbox moved up and down 1/2 inch from the cap of the 5th wheel. He says it doesn't seem to pull any differently but I don't think this is normal. I'm no expert but it seems to me that the pinbox should remain firm with the trailer and not move, even slightly. Sounds to me like the pinbox is loose or broken away from the frame work of the trailer. Unfortunately, you can't see up in there without removing all the paneling around the pinbox which isn't as easy as it sounds. Does this sound like something serious?

MFL

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Posted: 09/27/20 11:05am Link  |  Quote  |  Print  |  Notify Moderator

If the pin box bolts are tight, the FW frame may be cracked. While there may be a small amount of frame flex, it should not move a half inch. If something is loose/cracked, it will worsen over time, and become serious.

Jerry





fj12ryder

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Posted: 09/27/20 01:11pm Link  |  Quote  |  Print  |  Notify Moderator

If I noticed my pin box moving a 1/2" I would be pulling body panels to check things out.


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Lightning55

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Posted: 09/27/20 07:00pm Link  |  Quote  |  Print  |  Notify Moderator

Wow....150 views but only TWO opinions??

12th Man Fan

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Posted: 09/27/20 07:03pm Link  |  Quote  |  Print  |  Notify Moderator

What is the pin weight of his rig? Mine is about 4000 lbs and it moves about half inch when I set it on the hitch and it has done it since it was new.

If he can see it moving when he hits a bump I suspect he has a bigger problem and he Needs to find out for sure.


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Edd505

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Posted: 09/27/20 08:14pm Link  |  Quote  |  Print  |  Notify Moderator

There is a tolerance for movement, I do not know what it is. I was at a rally two years ago when one of the attendees had this issue. It was taken back to the factory and the front cap removed for measurements, they welded additional bracing to eliminate the amount of flex.


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Old-Biscuit

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Posted: 09/27/20 09:23pm Link  |  Quote  |  Print  |  Notify Moderator

When I inquired with factory rep 'What amount of flex' was normal he stated 1/4" MAX
More then that then pin box support structure or frame rails are under sized/braced

Should have your friend remove the overhang panel and visually inspect supports/frames/bracing when hitching & unhitching his 5vr


Is it time for your medication or mine?


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pinesman

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Posted: 09/28/20 06:34am Link  |  Quote  |  Print  |  Notify Moderator

Where should the measurement be taken? I have an extended pinbox so the closer to the end of the pinbox, the more pronounced the flex

MFL

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Posted: 09/28/20 06:45am Link  |  Quote  |  Print  |  Notify Moderator

pinesman wrote:

Where should the measurement be taken? I have an extended pinbox so the closer to the end of the pinbox, the more pronounced the flex


Pin box styles vary, but with most extended pins, I'd measure between pin box and lower front of FW over hang (normally front cap bottom).

Jerry

Lightning55

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Posted: 09/28/20 08:24am Link  |  Quote  |  Print  |  Notify Moderator

He measured the half inch movement about the half way point of the pinbox just under the front edge of the trailer cap. It's probably more movement at the tip of the pinbox.
He said the weight of the pinbox is probably less than 2000 lbs.
We attempted to remove some of the body paneling around the pinbox to see but stopped because we were certain that we'd create some damage to the thin aluminum panels trying to remove them. I think he's going to call the dealer next.

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