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Old 02-22-2016, 11:08 PM   #43
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My guess would be weld stress. A heavy piece of metal like that needs to be preheated before welding then slowly cooled to prevent stress cracks like that.

Probably skipped or shortcut the process.
(Monday morning mistake?)
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Old 02-23-2016, 05:11 AM   #44
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For your safety and all those around you, discontinue using the hitch and replace it.
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Old 02-23-2016, 07:55 AM   #45
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On the cause side, I would be curious to know more about your setup. What are you trailer model, tow vehicle, tires and age of hitch? I would hope that the hitches can handle much more than our normal loading.
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Old 02-23-2016, 08:21 AM   #46
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DANGER, DANGER Will Robinson!!!
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Old 02-23-2016, 09:34 AM   #47
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Several years ago I was fueling when I noticed something didn't look right on my reese WD ball mount. It was a 3" crack just like this one.....
Long story short, after deciding to end the days travel, the hitch didn't make it much farther than the edge of the parking lot!
Why chance it, stop and replace it!
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Old 02-23-2016, 09:39 AM   #48
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Looking at an enlarged image, it appears the ball itself looks loose, not that that caused the crack.....
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Old 02-23-2016, 09:39 AM   #49
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Stress cracks were probably caused by bad Marathon tires.
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Old 02-23-2016, 09:49 AM   #50
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Quote:
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Stress cracks were probably caused by bad Marathon tires.
Yep that is the obvious cause.
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Old 02-23-2016, 10:04 AM   #51
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good advice from the board

Many good comments here already. The ones I would parrot are:

1. Not minor, get it corrected now.
2. Check to make sure the ball is tight. Photo looks like it is loose. A loose ball will cause impact loads and could be the cause of your troubles. Certainly when you get the new head make sure the ball is torqued properly. Search here on the forum for the torque spec and how to get it done - that's been discussed over and over.
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Old 02-23-2016, 10:09 AM   #52
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Ryan, could you post an image of your rig from the side. Just interested in seeing your whole set up. Thnxs
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Old 02-23-2016, 11:27 AM   #53
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Odd that impact loads would start the crack there. Would have thought it would have opened up in the corners. Preheat? Would have thought the greater mass of the head would have been what needed to be heated and not the stinger tangs, which is where the crack is. This looks like turning or sway control stress. It also looks like either the weld had poor penetration on the stinger tang base metal or the metal has fatigued/work hardened. Betting the latter would be why welding cracks sometimes does not make a permanent repair. Pat
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Old 02-23-2016, 03:53 PM   #54
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The hitch will crack like that when you drop a fork in the black tank.
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Old 02-23-2016, 03:53 PM   #55
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Quote:
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Stress cracks were probably caused by bad Marathon tires.
That is a good one. I thought someone would say something about having an HA or a PP hitch, or maybe, "You been running with your fridge workin?"
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Old 02-23-2016, 04:24 PM   #56
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Quote:
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Poor weld, IMO
That's a good weld, it did not crack, the base metal cracked.
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