Also, he cut out two arms made of 1 3/8" solid steel that were welded to the mounting plates. He modified the mounting plates by adding 1" threaded rods that clamp the axle housings rather than sinking bolts into threaded holes. I took the tractor to a good machinist friend who happens to work on heavy equipment, and is perfectly happy with cutting steel that's several inches thick. All of the forces generated by that backhoe are carried by a few bolts that span a little more than one square foot and are also placed onto the rear differential and axle housings. This, in my opinion, is the result of a very weak mounting scheme from John Deere. Fortunately, the other bolts going into the rear end were still OK. That hogged out all threaded bolt holes in the rear axle housings. Upon further examination it became clear that the prior owner had run the backhoe quite a bit while all the plate mounting bolts were loose. So I managed to find a model 48 backhoe that was missing the plates, so I got a great deal, or so I thought! When I mounted the backhoe, I noticed that the plates were loose. I will reiterate the essential need for a subframe on these tractors! When I acquired my 4600, it had the backhoe plates mounted on the tractor, but I didn't get a backhoe.
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