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Old 09-25-2021, 05:11 PM   #1
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Join Date: Jul 2018
Posts: 16
5th Airborne Elite Rotating Pin Box failure

Anyone heard of a pin box failure under normal conditions?

As we pulled up to the campground yesterday we heard unusual noises coming from the hitch & pin box area.

After disconnecting the TV, I checked all the bolts and none were loose.
Using a strong light I carefully inspected the hitch, pinbox and mounting wings on the trailer.

What i found was shocking to say the least.
Stress cracks about 2" long on each side of the pinbox, half way between the kingpin and mounting point attachement to the frame.
They start on the bottom and go up. I'll try to post some photos.

The trailer weighs 13,340 lbs fully loaded acording to CAT scale measurement last month.
Pin weight is 2,420.
The Reese Airborne Rotating PB is rated for 16k tow and 3.2k pin weight.
I've not taken it offroad and keep within speed limits.

The cracks are bad enough that I'm not going to risk towing it back home.
I'll have to remove the PB for a temporary repair just to get home, and later source a new PB.
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Old 09-25-2021, 07:16 PM   #2
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Sounds like an overheated weld made the steel brittle....
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