450 and SA and brush hogs

P and R Pete · Jul 21, 2008

My father-in-law and I swapped brush hogs, because my King Kutter was twice the weight of his AVCO, and I have a Super-A, and he has a 450.

Here's the deal. The KK has shear-pins rather than a clutch, and he keeps breaking them. 5 today, he said, while mowing a horse pasture that was just a formality in the mowing- there was nothing tough to pull it through. I never broke one when pulling it behind my SA, but then, I have to mow in 1st gear, and he tells me he mows his pasture in 3rd gear.

Is there anything inherent in mowing with his 450 in 3rd gear that would be hard on the shear-pins?
He's getting pretty fried, and I don't want to have to swap them back.

Hayfarmer · Jul 21, 2008

I run a 5 foot KK on my JD 430, I think it is only about 25 hp. It could be using the wrong shear bolts in the KK, maybe wrong grade, I think it called for grade 5 in mine. I have broken very few shear bolts except hitting big rocks. I think there were different gear boxes on the KK that they could be ordered with, a 35 hp and heavier 55 hp. I suspect on your superA, when you engage it it pulls your motor down some and that takes up the shock, on the 450 with more hp, it puts the shock on the shear bolt.

Janicholson · Jul 22, 2008

Putting 4 times as much material through the mower will make it work 4 times harder! Just need to deal with the fact that it is not at the same speed, but expected to do the job. Drop a gear and save the gear boxes. JimN

P and R Pete · Jul 22, 2008

Thanks, gentlemen.
I"ll ask him about the grade. For all I know, he"s buying the ones designed for a snow blower that they have at the local Do-It Center. I would expect they"d want to shear pretty easily.

Yeah, it"s all hills here. The KK was WAY too heavy for my SA. I truck along pretty good with the AVCO.

450 and SA and brush hogs

P and R Pete

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Hayfarmer

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Janicholson

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P and R Pete

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