Fill it just to the top of the narrow part of the neck. Anything that gets above that, to the top 1-1/2 or so (the wider part of the neck), will just run out the overflow tube. Have the tractor level when you fill it. This will help keep you from getting air pockets in the sides of the radiator or especially at the back of the head. The coolant will expand when it heats up and the first time it will push up into the wide part of the neck and overflow through the tube. That is normal, and it will fall to its natural level when it cools. But it will overflow even more if you have any air in there, as the air will expand more with heat than the coolant will and will force out too much of your coolant. After filling from empty, I like to go out first thing and run the tractor up a little incline to get any trapped air out of the back of the head, and then alongside that incline in both directions to do the same thing with the radiator. If the level drops off any, I fill it back to the neck as described and let it heat up. You'll notice the level drop after the first time it cools own. Notice where that level is, then top it off to the top of the narrow part once more. If it falls to that same level the next time it cools down, that'll tell you the level you want to keep it at.
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