I have a 1520 also and just this last weekend it started to run hot with the 5' brushhog. as I read this post I thought i got screwed when I read that a 1520 was rated at 23 and 18 hp cuz the dealer said it was 35 engine and 28 pto. went back th NH site and yes it is 35 engine and 28 pto. so using the 5hp/foot of cutter would still be ok with the 5' hog. Better yet, the radiator discussions were good . didn't realize the fines could build up and not even be able to see them. will blow out rad next weekend with leaf blower. Once again TBN to the rescue.![]()