I wish they would have been invented back when I was working on a lot of cat equipment.
The 631 and 657 scrapers had a bad habit of getting cracks in the cross tube that joins the goose neck of the bowl to the tractor the tube was about 18 to 20 inches in diameter with an opening under where the goose neck joined it. By the time you got your head and one arm up in there, there was little room for anything else. The best way to repair them was to break the machine down and remove the draft arms from the tube remove the goose neck form the tractor and flip the thing upside down. About a weeklong process when all was said and done. But I was known to be a glutton for punishment. I made me a leather sock helmet and mounted cutting goggles to it similar to the ones you can buy like this.
I would reach up in there armed with a full set of leathers and the sock helmet gouge out the cracks with a torch to about an inch deep clean them out with a bur on a die grinder. Change to a #10 lens and weld up the crack then form a pair of half rings about 2 inches wide and an inch thick and weld them over the weld where the crack once was. Turning a 4-to-5-day job sometimes requiring 3 men an overhead crane and a huge forklift into a 1-man job taking at most 2 days, guess who never got the extra money the company was saving though. But to be fair I did make $5.00 an hour more than any of the other contract welders

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