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Override cluth

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shan

08-16-2001 07:42:02




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what does a override clutch for a PTO shaft do and should i get one for my H i have a 7 ft woods finish mower i use???? me again shan




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Craig

08-16-2001 16:41:04




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 Re: override cluth in reply to shan, 08-16-2001 07:42:02  
Hi, I lost a freind a few year ago from not having a overide clutch. the mower push the tractor over a bank and it rolled over, he was thrown in to the mower blades. Moral to this story is for all to use a overide clutch on these older pto's Craig



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PaulH

08-16-2001 15:07:13




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 Re: override cluth in reply to shan, 08-16-2001 07:42:02  
Whether you need the overrun clutch depends on the inertial forces created by the mower. The H PTO is driven through the transmission, and any torque applied to the PTO shaft will be transmitted back to the transmission, even though the clutch may be disengaged. You need an overrun clutch when using a brush-hog type mower on the H. These mowers have tremendous inertia, and will push the tractor right into a fence, road, pond, or wherever it's pointed, even though you have pushed in the clutch. I pull a six foot King Kutter rotary mower with my M, and the shaft spins for several minutes after I disengage the PTO. Finish mowers have multiple spindles and much lower spinning masses. I have a five foot Woods belly mower (belt driven, 3 spindles) on a 100, and have no problem with not using an overrun clutch on this setup.

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Farmall Paul

08-16-2001 08:54:00




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 Re: override cluth in reply to shan, 08-16-2001 07:42:02  
Shan- I just got an over-running clutch for my mower. I was interested to see how it worked, so I took it apart. They have a collar that is splined for the PTO that has 4 slots. It goes into a receiver that has some sawtooth cuts machined into it, and has a splined PTO shaft on the other end. The four slots in the collar had four keys with little curved springs (kinda like a leaf spring) that push the keys out against the receiver part. The keys will lock in the sawtooth cuts when you try to turn the collar one way, but will 'ramp' off if you turn the other way. This way when your mower keeps turning the over-running coupler will slip and not push the trans gears in the tractor. It's a simple idea and seems to work well.The stories about mowers pushing tractors into ponds/fences are SCARY. Paul+

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