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Ford Tractors Discussion Forum
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PTO Override clutvh (coupler)

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GlenIdaho

01-30-2007 21:44:42




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I just read the message from Milton concerning his 850 and the recommendation that was given for the PTO override coupler. I know this is going to be a dumb question, but here goes anyway. I know that the coupler will spin freely when the implement speeds exceeds the PTO speed. I am guessing this is to prevent the implement from reaching a speed that may cause failure and cause injury. Is this a correct guess. If not, could someone tell me the purpose and benefits? I have an 850 and a bush hog and auger. Thanks, still learning.

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Jerry/MT

02-01-2007 18:14:28




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 Re: PTO Override clutvh (coupler) in reply to GlenIdaho, 01-30-2007 21:44:42  
The over running clutch (ORC) is used on PTO driven implements that have a high rotational inertia to prevent driving the tractor when one is attempting to slow down or stop with a tractor having a transmission driven PTO. The rotating inertia of, say a rotary cutter, will continue to drive the tractor forward even though the operator has disconnected the engine from the driveline by depressing the clutch pedal. The ORC only transmits torque from the PTO to the implement and not vice versa. If you didn't have an ORC and had a rotary cutter and you wanted to stop near a pond and depressed the clutch, the inertia of the rotary cutter will drive the rear wheels even though you had the brakes on and you might end up in the pond. if you have live or independent PTO's, you don't need an ORC.

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twin

01-31-2007 11:43:41




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 Re: PTO Override clutvh (coupler) in reply to GlenIdaho, 01-30-2007 21:44:42  
I have a 1970 3000 diesel and it requires a ORC. I originally installed it on the PTO outshaft but after talking with Hub City learned that it can be installed on the implement input at the gearbox. The level of deflection is not as great aftwards on my 3000 and I installed it adjacent to the gear box but had to disassemble unit and change the direction of the internal dogs. Works a whole lot quiter with almost no vibration. Of course if you have several implements that you use it might not be practical to purchase more than one ORC. Without an ORC you will be running over the fence cause you can't stop the tractor on a dime when you have all that energy (centrifigal force)of the bush hog pushing, even when you hit the brakes.

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GlenIdaho

01-31-2007 09:21:05




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 Re: PTO Override clutvh (coupler) in reply to GlenIdaho, 01-30-2007 21:44:42  
Thanks fellas. Now I know what was going on when using my brush hog. Looks like another purchase needs to be made.



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Oldmax

01-31-2007 05:13:18




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 Re: PTO Override clutvh (coupler) in reply to GlenIdaho, 01-30-2007 21:44:42  
Some of the newer tractors have built in overiding coupler I know my 1715 has one which I have to replace because it is damaged .



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kc5gxc

04-23-2007 19:52:47




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 Re: PTO Override clutvh (coupler) in reply to Oldmax, 01-31-2007 05:13:18  
I am curious...how did you damage it? I got a 1715 and it sure is a good working machine. I really like it and it has to work hard around here. I ain't got much fenders left...ha ha.
Pete in MS



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guest

01-31-2007 04:01:51




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 Re: PTO Override clutvh (coupler) in reply to GlenIdaho, 01-30-2007 21:44:42  
Exactly right.

Think of the hog as being a huge flywheel
directly connected to the transmission.
Get it running, and decide that you need to stop
before running into a ditch, pond, car, person,
animal, etc. Stepping on the clutch, turning off
the motor, to avoid and the tractor keeps going
foreward as if it is posessed.
While most old tractors are posessed, it is the
missing ORC that is the cause.

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Bob

01-30-2007 22:04:46




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 It's an OVERRUNNING coupler. in reply to GlenIdaho, 01-30-2007 21:44:42  
Used with a tractor with non-live (transmission-driven) PTO, the overruning coupler prevents the inertia (kinetic energy) stored in an implement such as a rotary cutter from "backfeeding" and continuing to drive the tractor's forward (or rearward) motion after the clutch is depressed.

It is a SAFETY DEVICE to prevent the tractor an operator from continuing onward into a HAZARD, even though the traction clutch has been depressed.

AN "ORC" has NOTHING to do with preventing the IMPLEMENT from reaching a speed that may cause failure and cause injury.

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