I have a 70 loader on my 855, and a 420 loader on my 4310. The 4310 uses those QA brackets that you show. I even have a set in the junk pile that I replaced because the previous owner had strained them. Looked like he lost a pin and then put the bucket in a tiwst. The loader was fine, but the brackets don't tke much lateral stress.
I would have to do some measuring and take some photos, but I think that they would mount on the 70 loader. However, they fit a bucket with a completely different back side profile. I know this because my 70 loader came with a 72" material bucket which was too much for the 855, so I bought a new 60" bucket for it instead. Yesterday I dragged to the old bucket out of the brush so that I could weld the lips and bullet locators on it and use it on the 4310 (the old bucket has a smooth edge and the 4310 bucket has teeth mounted, so it would have been convenient to have both toothed and smooth edges available). The 70 loader bucket has a short backside vertical protion, angling up and away from where those QA mounting bracklets would meet the bucket plate at the top edge. So, I think that they would fit, but the 60/70/70A loader owners would probably render their current buckets non-operational.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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