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Overrun vs. slip clutch

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10-12-1998 06:50:35

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I bought a used 25 HP Satoh tractor. It was suggested to me to buy a "slip clutch". I was told there was only one size and it would cost around $20. When I called the stores, they asked if I wanted a "slip clutch" or an "overrun "adapater" and there were two diameters given.
I'm confused. By the way, the bushog does NOT push the tractor forward as I've heard about with Ford 8N, but a "clicking noise" is heard until the bush hog stops turning.

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Paul Fox

10-12-1998 13:09:51

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Re: overrun vs. slip clutch in reply to jd, 10-12-1998 06:50:35

: I bought a used 25 HP Satoh tractor. It was suggested to me to buy a "slip clutch". I was told there was only one size and it would cost around $20. When I called the stores, they asked if I wanted a "slip clutch" or an "overrun "adapater" and there were two diameters given.
: I'm confused. By the way, the bushog does NOT push the tractor forward as I've heard about with Ford 8N, but a "clicking noise" is heard until the bush hog stops turning.

Based on your "clicking" noise, I'd say you already have an overrun clutch, probably built into the PTO on the tractor. An "overrun" clutch is designed to transmit power in one direction of rotation, and "rachet" in the other, to prevent the sort of "pushing" you mention from the flywheel effect of the blades on a bush hog or other large rotating mass. A slip clutch is a friction device, and is designed to slip in EITHER direction (but primarily in the "driving" direction) to prevent damage if the rotating mass is stopped suddenly. A good example of this would be a PTO-driven rototiller that jams a rock between the tines and the frame. Two entirely different animals, with different applications.

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10-16-1998 09:33:19

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Re: Re: overrun vs. slip clutch in reply to Paul Fox, 10-12-1998 13:09:51

: : I bought a used 25 HP Satoh tractor. It was suggested to me to buy a "slip clutch". I was told there was only one size and it would cost around $20. When I called the stores, they asked if I wanted a "slip clutch" or an "overrun "adapater" and there were two diameters given.
: : I'm confused. By the way, the bushog does NOT push the tractor forward as I've heard about with Ford 8N, but a "clicking noise" is heard until the bush hog stops turning.

: Based on your "clicking" noise, I'd say you already have an overrun clutch, probably built into the PTO on the tractor. An "overrun" clutch is designed to transmit power in one direction of rotation, and "rachet" in the other, to prevent the sort of "pushing" you mention from the flywheel effect of the blades on a bush hog or other large rotating mass. A slip clutch is a friction device, and is designed to slip in EITHER direction (but primarily in the "driving" direction) to prevent damage if the rotating mass is stopped suddenly. A good example of this would be a PTO-driven rototiller that jams a rock between the tines and the frame. Two entirely different animals, with different applications.

Great advice, thanks. I think I'll do without the $90 overrun adatper/ slip clutch!

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