Renze
Super Member
It sure looks like it. The weld broke clean off the plate, with little penetration. Looks like a top down weld instead of an underhand weld with the trailer rolled in its side for access.
Hitch failure on a Diamond C FMAX 212
- Thread starter nisaacs
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It sure looks like it. The weld broke clean off the plate, with little penetration. Looks like a top down weld instead of an underhand weld with the trailer rolled in its side for access.
Think overloading by a couple tons helped?
Hay Dude
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I have overloaded my much “lower quality” Kaufman and haven’t experienced and weld failures or broken goose neck hitches.
Yet.
Topzide
Platinum Member
A proper weld with penatration, in theory, is stronger than the metal around it. Overloading would cause bending or axle failures if welded correctly. Metal should have torn instead of weld popping apart!
Look at pic #4 it’s a 30k trailer that weighs 11620 so yea 2 11K machines plus attachments puts it a couple tons over.
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Axle, brake and tire failures are ok as long as it doesn’t bow or have a weld failure. What is the engineered “safety margin” when overloading?
It has two 16,000 lb axles which = 32K. Add a significant amount of tongue weight to that number. That exact trailer is also available in a 40K GVW configuration. So, trailer empty weight = 11620. Add two 11K lb. machines. Throw in 1000 lbs of attachments for good measure. 34,620. A trailer whose frame can support a GVW of 40K should not be cracking with that weight. Even if the max GVW on that frame was only 30K, not 40K, it should still not be cracking like that with a little extra weight on it.
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Hay Dude
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Maybe some wild-eyed cowboy drove it across a bumpy field overloaded going way to fast?
We all blamin DC, but usually its operator error
We all blamin DC, but usually its operator error
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They need establish QC on their welding process starting with independent 3rd party NDT on safety items.
How many posts are on TBN where the claim is you can’t run this trailer or that trailer because it’s not DOT legal? Now, you all are defending an overload. 
aesanders
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No one is defending an overloaded trailer. What people are pointing out is a trailer shouldn’t split in half at a weld because it is overloaded. Especially when the exact same trailer can be outfitted with larger axels and increase the load capacity. Huge difference.
OP
nisaacs
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Since we are on the subject.
This guy is having a bad day. He made the mistake of posting on a trailer forum I frequent and brought out all the weight police
He might over load and might not, maybe he hauls off highway like I do. Whatever the case is, it should not have happened. That frame flange looks awful thin for 12k axles.
This guy is having a bad day. He made the mistake of posting on a trailer forum I frequent and brought out all the weight police
He might over load and might not, maybe he hauls off highway like I do. Whatever the case is, it should not have happened. That frame flange looks awful thin for 12k axles.
RandyT
Elite Member
Lets concentrate all the weight of the trailer on a 4 inch wide strip of the frame and then wonder why it broke.
Well, where should the failure occur? Don’t stress failures always occur at the weakest point whether that point be tires, axles, fasteners or welds? How does exceeding the manufacturers rating not increase the likelihood of failure?
mrmikey
Elite Member
Really tho.
Looks like a poor design to me, having no doubler for the walking beam mount. Not only that but i looks as if they welded across the flange of the frame, hard to tell for sure tho.
Walking beam looks a bit funky too but it could be an optical illusion.
Not sure what posts you're referring to. I have no control over what others post. Anyway, you must have missed part of what I posted. That trailer frame is not overloaded. They sell that exact trailer frame with a rating of 40,000 GVW.
The trailer in question is manufacturer speced at 30K GVWR, not 32, not 40. If you want to argue about something, how about the gooseneck to frame design.
Renze
Super Member
...without gusseting the I beam so so all the weight pushes into the vertical flange..
OP
nisaacs
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Just to compare, my 16k Lamar dump uses a heavier I-beam/flange and add a 3/4" plate at the spring hangers.
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