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ROTARY MOWER, SHEER PIN OR SLIP CLUTCH

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Steve in Oregon

06-03-1999 12:10:40




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I have a 1960 Massy Ferguson 25 and have been warned that the PTO shaft is a weak link. I am planning on buying a rotary mower soon and want to know whether a slip clutch of a sheer pin will be easier on my PTO.
Thanks for the advice. Steve




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B.C.

06-09-1999 12:01:52




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 Re: ROTARY MOWER, SHEER PIN OR SLIP CLUTCH in reply to Steve in Oregon, 06-03-1999 12:10:40  
The right slip clutch is a bunch nicer than shear pins. Like others have said, it needs to be adjusted and maintained properly but it's a lot nicer to live with, especially if you need driveline protection. I think the spring loaded ramp types are the best.

If you forget and use a grade 8 bolt for your shear pin you might get some interesting results.



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John

01-30-2004 04:22:46




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 Re: Re: ROTARY MOWER, SHEER PIN OR SLIP CLUTCH in reply to B.C., 06-09-1999 12:01:52  
please help me. My sheer pin snapped off of my cub cadet snowblower. My neighbor said that I could just hammer the remainding part out and replace it. But I tried to and it won't budge. Is it screwed on? My neighbor said it shouldn't be threaded just smooth. It's making the right side of the auger not work. It's free wheeling. What should I do?



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Robert

06-09-1999 10:07:03




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 Re: ROTARY MOWER, SHEER PIN OR SLIP CLUTCH in reply to Steve in Oregon, 06-03-1999 12:10:40  
I have bush-hogged for years and never had the privelege of trying a hog with a clutch. i recently bought a new 5' hog for my MF 50 (1959) with shear bolts, largely because of the cost, the simplicity and my experience. i agree that it is more trouble and that you have to carry additional tools but so what? Like any other task you just organize for the one you are doing - put all the stuff in one bag and leave it where you can get it easy. One important point however is don't use number 5 bolts. Use only grade 2 or you will not really be using it effectively - the no. 5 won't break easy enough. If you break a number 2 you shouldn't be in there in the first place. I have only broken one all spring in about three full days of cutting.

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Mike

06-07-1999 07:30:12




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 Re: ROTARY MOWER, SHEER PIN OR SLIP CLUTCH in reply to Steve in Oregon, 06-03-1999 12:10:40  
I have a shear pin on my 6 foot bush hog. I've hogged 30 acres and not broken the pin. Other years, I've done the same work and broken 4 pins. Takes about 5 minutes to replace the pin. Grade 5 bolts are sold by the pound. I don't think it's a big deal.

If you store your equip outside, you have to keep the spring type slip clutches well lubed. Rust build-up on the drive surfaces can increase the slip point tension.

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Paul Fox

06-03-1999 14:48:00




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 Re: ROTARY MOWER, SHEER PIN OR SLIP CLUTCH in reply to Steve in Oregon, 06-03-1999 12:10:40  
A slip clutch, properly adjusted, is fine for the PTO and a LOT easier on the operator!

Shear pins are a pain in the butt. If you get a soft one, it breaks too easy, ya gotta carry a handful of spares, a punch and a hammer every time you mow, ya gotta shut down and wait for everything to stop spinning to replace them...WAY too much trouble for me.



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