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I have the same loader and the arm also broke at the same place back draging. I did away with the hollow pipe in the middle and welded plate all around the arm and replace the pipe that it welds on the inside of the arms and does not gop all the way thru. I have broken most of the front end loader parts and re frabricated every thing heavy duty. The metal is very pourous and cheap. Not like american steel.
I guess all the metal is that recycled stuff. Because when you look at the metal it is pourus. The arms on the loader were not pourus just thin. The pipe they had going from one end to the other where the lines lay on top of had some very weird looking metal. I will put photos of the finished job in a few days. I am redoing all the lines now. I welded these plates all around the arm and it holds up good now. I also ran 2 pipes going across instead of one.
I am confused. Your first quoted post does not match the pics in the second. Someone has SEVERELY abused that loader and tractor in the second post. It has been rebuilt beyond recognition. You say you have a GB built loader on a 4500 and that is clearly not the case in the pics. I have been in this business a long time and have NEVEr seen a loader destroyed like the one in your pics.