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Ford Tractors Discussion Forum

Do I Need an Over-Riding Clutch?

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Ian in Tennessee

11-05-2004 15:13:52

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I learned today that I have an over-riding clutch on the PTO of my '55 640. (Up til now, pathetic newbie that I am, I thought it was an adapter from the smaller PTO to the larger size.)

A friend dropped by and said I needed it to keep bush hogs and the like from forcing the tractor forward until the implement spins down. I thought that was only true while the tractor was in gear. If the 640 is in neutral, it's not a problem, right?

I don't own a bush hog, but I'm getting ready to run my new PTO chipper and will, of course, only run it in neutral. So I guess my other two questions are:

Is there any advantage to keeping the ORC on the tractor?

Could it prevent the shaft from being damaged if the chipper binds or would the belts on the chipper slip first?

As usual, many thanks in advance.


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Ian in Tennessee

11-07-2004 08:14:38

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 Re: Do I Need an Over-Riding Clutch? in reply to Ian in Tennessee, 11-05-2004 15:13:52  
thanks to all who answered.

Guess I'll keep the ORC. Especially since I already cut down the shaft to fit . . .


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11-05-2004 19:03:57

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 Re: Do I Need an Over-Riding Clutch? in reply to Ian in Tennessee, 11-05-2004 15:13:52  
You realy only need an overiding clutch with a bush hog or simler type equipment that can push you when you try to stop, I have found that on some mowers the PTO shaft is to long to use the clutch. You wouldn't need it with a wood chiper.

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11-05-2004 17:05:25

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 Re: Do I Need an Over-Riding Clutch? in reply to Ian in Tennessee, 11-05-2004 15:13:52  
If you have a live or independent PTO, you don't need an ORC. The early Fergusons (TO-20, -30) and the Ford 2N, 9N, & 8N. have the PTO driven through the transmission. When you step on the clutch with the PTO being driven, if the device driven by PTO has a large ammount of rotating mass, it will continue to rotate and drive the transmission and hence the rear axle. So you don't slow down like you might expect and are likely to hit something. With the ORC, it automatically disconnects the driven device from the PTO shaft so this can't happen. I don't know what kind of PTO drive you have on the Ford 640. I would think it might be live and if so, you don't need an ORC.

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11-06-2004 04:03:34

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 Re: Do I Need an Over-Riding Clutch? in reply to Jerry/MT, 11-05-2004 17:05:25  
For the 100 series Fords, you need a model number of x6x or an SoS tranny (models x71 or x81) to have live pto. All others, such as x4x (his 640) are non-live.

He does not have live pto.

He is basically correct that he doesn't need the ORC for his one application, but does if he uses a pto implement while driving.... It doesn't hurt to leave it on as long as he gets the pto lengths right.


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11-06-2004 19:10:54

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 Re: Do I Need an Over-Riding Clutch? in reply to paul, 11-06-2004 04:03:34  
Thanks, Paul. I'm not familiar with these models of the Ford line.

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11-07-2004 07:41:35

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 Re: Do I Need an Over-Riding Clutch? in reply to Jerry/MT, 11-06-2004 19:10:54  
One of the few things I am familiar with! ;)


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L Schulte

11-05-2004 16:42:29

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 Re: Do I Need an Over-Riding Clutch? in reply to Ian in Tennessee, 11-05-2004 15:13:52  
I would leave it on, it has a shear pin, if something get loct up in the cillper it should shear. Just a extra safety precaution.

If you ever use a mower you will need it.

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