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Old 04-11-2013, 02:25 PM   #1
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'12 26BH A-Frame Damage -- Is repair required?

After our last trip I noticed the damage to the A-Frame of the TT. Funny thing is I don't recall doing it. You would think if ever I turned sharp enough to press a hole in the A-Frame I would have felt or heard it, but nothing. Looking at the hitch head and trunion carriers I see no damage either -- its baffeling. The TT was at the dealer for a warranty repair to the DVD/CD player, I guess they could have done it with the forklift. Again I don't recall seeing it when I picked it up either so even if they did I could never prove it.

Anyway, have a look -- is this something I need to have a plate welded on to repair? Or can I simply sand the little surface rust and paint over so it doen't continue to rust and let it be? If I do add a plate shoudl it be on the inside of the frame or outside? As you can see the damaged area is small, about the size of a quarter, so there is still a lot of intact steel in the area.

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Old 04-11-2013, 03:05 PM   #2
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That is an interesting one. Did you maybe make a sharp turn and it came in contact with the frame?

I am no expert, but the weight is all on the top and not the bottom. I would think you could have a welder "fill" it, then grind smooth and repaint.
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Old 04-11-2013, 03:31 PM   #3
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Very interesting damage, I cannot foresee how your TV could have done that. I would also suspect the dealer with their fork truck style unit, may have done it. But as you say, that would almost be impossible to prove.

Because where the damage it is at, I would strongly consider having a welder weld on a piece of angle iron, to reinforce the damaged section. If the damage was any further back, I would absolutely have it welded up. The top of the A frame is under compression forces and the bottom is experiencing tension (pulling forces). I could foresee under the strains of heavy loads, rough terrain, and the WDH, stress cracks could grow furthering additional damage.
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Old 04-12-2013, 08:25 AM   #4
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That was hit by something going forward not back from the hitch...must have been a second party involved.. like when on the dealers service lot...
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Old 04-12-2013, 07:55 PM   #5
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I tend to agree that it would pay to have a certified welder address the damage..., the rounded corners of a steel tube are critical to the strength integrity of the steel tube.

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Old 04-12-2013, 08:55 PM   #6
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Just my two cents, but based on the location of the damage I don't believe it is in the load path and probably won't cause any issues. I did a simple shear and moment diagram and the values are pretty low in that area of the frame. The frame was designed to handle a higher load around the axle. Take a look at the diagrams I attached. The moment values are much higher around point B (the axle) than point C (hitch).

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I can't answer how it happened, but hopefully this helps you understand the level of risk......which I believe is low.
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Old 04-12-2013, 10:18 PM   #7
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I agree with pjsl01, but his answer is loaded with more statistical data to back him.

My original thoughts though were if it was on my trailer in that location, I would just sand it and paint it to protect it from rusting.
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Old 04-12-2013, 10:24 PM   #8
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Pjsl01, glad to see that you did an analysis on the frame. My only additional 2 cents would be the analysis was done on a static load. Unfortunately, our TTs are on the road, with a very dynamic load, due to the road conditions and the WHD stresses. These are similar conditions that make some peoples rear TT bumper fall off after many miles of having a clamp on bike carrier connected to them.

If it was my TT, for peace of mind, I would weld it up.
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Old 04-13-2013, 05:05 PM   #9
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I would hook up the TV and back it up jacked knive and see if any part of the hitch would hit that part of the tongue. If it is not Evan close to that part of the tongue I would take it to the dealer and show him.

I would weld it up and grind it smooth and repaint.
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Old 04-13-2013, 09:24 PM   #10
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Quote:
Originally Posted by pjsl01 View Post
Just my two cents, but based on the location of the damage I don't believe it is in the load path and probably won't cause any issues. I did a simple shear and moment diagram and the values are pretty low in that area of the frame. The frame was designed to handle a higher load around the axle. Take a look at the diagrams I attached. The moment values are much higher around point B (the axle) than point C (hitch).

Attachment 7342Attachment 7343

I can't answer how it happened, but hopefully this helps you understand the level of risk......which I believe is low.
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