MF brush hog

Donald Lehman

Well-known Member
I have a MF brush hog model 84. Serial # 1136-00001.

The tag says manufactured by EL Caldwell and Sons Inc., Corpus Christi, TX.

All I know is Pop bought the thing about 1963 or 1964 and I believe it was used at the time, but I can't remember for sure.

What can you fellows tell me about what years it was made?

Also, what grade shear bolt should be used? I have been using grade 5's but they seem to shear much easier than I remember them shearing when Pop used it.
 
You did not say what you are cutting with the old rotary cutter,

But believe me, it's much easier to change a shear bolt from time to time, than to replace busted gears, gearbox casing or stripped out u joints,

Are you pulling the old cutter with a larger higher hp tractor than was used years ago?
 
Light brush, and yes, higher HP. That's part of it. But Pop used to cut any thing he could push over up to several feet tall (including white birch up to a couple of inches in diameter) with the front axle of the tractor. Just seems they shear pretty easy. I'll stick with grade 5 for the reason you mentioned. But I was just wondering if they used a special shear pin. And yes, he used to ease into that size stuff pretty slowly.
 
I did find a picture of a old MF 84 rotary mower parts manual (no on-line manuals). For a shear bolt you want to use a Grade 2 bolt (not a grade 5), and yes they are supposed shear easy .I had one mower that I got tired of continuously replacing shear bolts on so I put a slip clutch on it. The slip clutch sure beats dealing with shear bolts all the time.
 
(quoted from post at 09:26:11 05/10/16) We had a Massey-Ferguson (Caldwell) Model 65. Toughest darned machine we ever owned. Wish I still had it.

AGCO has the online parts book for that one, I guess they didn't sell very many 84's.
 

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