Thanks Vigo. yeah--that bolt is a mystery. A guy on a FB kubota B site that just bought a B7100 has one on his tractor, but neither of us can figure out what it was for. he thought it might have acted like a set screw on a draw bar.Not sure on whether the washer NEEDS to be bsp but i know you can get a big assortment of copper sealings rings cheaply on Amazon. I bought an assortment a while back and will probably never run out.
The bent thing with thread damage is used to tighten the 3pt arms inwards, taking side-to-side slack out of the 3pt so attachments can't swing/bang back and forth. Leaving it as is would just mean you couldn't shorten that link any more, but i doubt it would actually fail. I'm not sure what they're called when used in that function right there but generically it is a turnbuckle.
The bolt in the last pic probably doesn't belong there and may have just been used as a hitch pin stuck through some clevis hitch like a yard cart. Hard to tell without knowing how long it is on the other side.
thanks for the advice on the copper washers.
Speaking of amazon...does anyone have a good source for kubota parts? I'm gonna need a new gas cap, new drawbar (mine was missing), rear PTO shield (or shroud?), PTO cap, air filter, and I'd probably like to replace that broken part on my 3pt hitch.
thanks,
b