If you're just hooking a spring to the throttle arm on the pump, the constant swiveling motion is wearing on the hook end of the spring, causing it to eventually get thin and snap.(Been there, done that)
What I did to cure the problem is this: Weld (2) 1/4 or 5/16 washers together, attach the washers to the throttle arm with a bolt thru one hole (use a self locking nut and leave the bolt loose enough so the washers are free to swivel as the arm moves).
Hook the throttle spring thru the hole in the other washer.
Now when the throttle arm moves, the swiveling motion is at the bolt thru the washer, and the spring does not get worn at the end.
BTW, this was on Mack engines, but you should be able to adapt it to others.
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If you can't shift it smoothly, you shouldn't be driving it.
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