Dude?,,,where ye be from,,the left coast? Seriously now,,,I can't be wrong,,cause I'm just stating a fact,,,,,,all tractors are not made the same in this regard,,,let me tell about mine,,,ok dude??,,,,on mine, there is a screen in a slot in front of raditiator,,thats the way they make them,,,the screen has much bigger holes than a screen in a screen door,,but it is pretty heavy duty,,,,now,,like I said,,I put a window screen over that,,it clogged up in less than an hr and tractor started over heating,,,,,took that crap out and just blow raditiator out every two-three hrs now when mowing,and have been doing it for three years now[I mow about 10 acres of grass with it and hog,about 5 times a year],no more over heating,,MY,,problem solved,,,,,,now on MY tractor,,,you have to shut tractor off,,raise hood,,,loosen air intake hose,[thats why you got to shut tractor off],,,pull that factory screen up,,[thats why you got to loosen air intake hose],,than clean off that screen door screen,,and in the conditions I cut in,,,you would need to do that about every 45 min or so,,,plus on top of that,,,you are hopeing the heat gage is accurate,,so's you will know when to stop and do this,,,plus,,you are not supposed to shut off a hot motor untill it cools to normal operating temp.......
Now on yanmars,,this maybe a much more simpler process??? don't know,,and on modern,18,000 tractors,,I'm sure it is,,,just relating my experiences,,,so you see dude,,I can't be wrong,,,,I'm up to bat again,,made it to first base for second time!! happy trails,,,the thing