One of those castings, the rear one I believe, was broken when I bought my tractor, probably because of excessive loading of the front loader bucket.
The pivot tube is supported by castings at the front and rear. The front beam axle pivots around a steel tube ( tubing so that the hydraulic pump shaft can go through it). One other consideration is the capacity of the front axle pivot assembly. My TO-35 does not have power steering, and with the bucket installed the steering gets a bit heavy, and the rear traction suffers too. I usually don't keep the bucket on the loader, except when I need it. It's a well built loader, and has a bucket that dumps via a hydraulic cylinder. Apparently they were fairly common, since I saw a replacement hydraulic pump ( front of engine mounted) in a surplus catalog that was identified as being suitable to replace the one that came with the Wagner loaders. I believe the nameplate says " Wagner Iron Works". My 1955 TO-35 has a Wagner front end loader. I still have the phone number of the guy I bought the Freeman from and will confirm the tractor model it came off of for reference. Although it was probobly worth it, I wasn't ready to spend another thousand at the time after rebuilding the motor. I ran across a box style loader arm style at a local dealer but he wanted $1000.00 for it. Mine has a box style lower frame but a tubular style lift arm. I was just looking at other posts here on the TO35 and have noticed that they all have box style loader arms which are a much heavier duty loader. I'm sure there are others out there from other manufacturers but I'm only familiar with the Freeman other than the Genuine Massey Ferguson early model 32 that I have mounted on my 135. I can get the model number off it and some basic dimensions to see if it would fit. It has single acting lift cylinders and has an auxiliary pump mount that replaces the front axle pivot pin which is driven off the front pulley. Its not an extremely heavy duty loader but would be a lot better than a shovel. The loader has a trip bucket with manure tines. It looks like the TO35 is a much heavier duty tractor. I picked up a Freeman loader several years ago that I believe came off a TO 30 which I think would fit.