"[D]isingenuous...."
It you truly doubt "lateral loading" pull the lynch pin securing the link between the upper and lower lift arms on either (or both) or your MX6000. Now set the stop watch on your phone and go out and whatever you might want to do with your tractors. Post back with honest information regarding the time it takes for the link(s) to disconnect.
Oh, interesting. When you said you've previously seen it happen a few times on left arms, I was working toward the theory that it was due to the different type of retainer on that side. But from this comment, now I'm questioning that.
Wow! And you claim to have been or are an engineer ... of what? Perhaps you engineered paper bags or something. Your lack of understanding of the application of engineering principles is spectacular. Who were these four companies you worked for, and what was your engineering discipline? You are so enamored with erroneous issues that you can't see the woods for the trees.
If you look at the picture you can see the bolts and the securing plate that is bent from the completely seated position.
That was certainly the case with use of my rear blade in this situation. Rocks and hidden tree stumps. I generally don't go crazy reversing with the blade, but I was using a lot of effort dragging it in forward.
I've spent the last 12 years looking at firearms that have been returned by customers with all manner of stories as to how the firearm was destroyed and how it wasn't the customer's error, incompetence or abuse that did it. One of the things you rarely have access to in an analysis is the truth as to how the product was used, but you can show that if the product is used as designed, it's not possible to cause the damage shown. I'm not making any statement as to the validity of the OPs statements re use.
Again, how does any of that result in a lateral force to the rock shaft if the 3-point linkage is fully present and adjusted correctly. Remove the stabilizers from the 3-point and I can see this being possible. But with them present and adjusted there's no way to laterally load the rock shaft without damage the stabilizers, which you have stated were present, and weren't damaged.
I'm interested in the facts and the truth, nothing else. I want to know how this happened because I'm naturally inquisitive and I'm invested in this because I basically have the same tractor as you. In no way do I think you're being misleading, at least not intentionally, and if a defect caused this it should be repaired under warranty.
Further to my theory of the case:
Post back after you've pulled the lynch pin and headed out to work.
You and rbargeron are seeing what happens correctly. A heavy side draft and or angled force can place a side load on the arm which tries to push it off the rock shaft.
I think you and loggin have it. As long as the lift rods are hanging perfectly vertical they don't exert a side load on the arms. But if they are spread apart at the bottom, weight on the implement causes a horizontal component of force pulling the arms apart. The more angle of spread, the larger the side force, but I wouldn't expect a large load.
I'm not going to entertain your ridiculously foolish idea of an experiment. If you think about vibration and the constant loading and unloading of the rock shafts during use, a two year old would soon figure out that the lift arms would/could vibrate off the pins. The fact that the hardware on these tractors relating to lateral loading of the 3-point linkages is so minimal should be evidence enough that lateral loading is not a thing.
