1 a pair of 12 inch adjustable wrenches to move the top link length
2 extra top link and side link pins IN the tool box on the tractor. this includes the 3pt attach pins and big nuts that hold them.
3 extra grease gun and a bunch (case) of tubes. it goes pretty fast
4 many extra clips and pins. They seem to enjoy leaping free!
5 good hearing protectors. Droning noise causes permanent damage. I have a set of 33db muffs on each tractor, 2 pairs in the truck and several in the shop / barn.
6 enough fuel cans to fill the tank from empty... plus one.
7 info locked tight in your brain on how to bleed the system AFTER you run to totally dry. It will happen, usually when you are farthest from any reserve can and have to cross a muddy field and then it will rain! (or is that just my luck?).