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Tractor Talk Discussion Forum

ORC for an Independent PTO

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Jerry/MT

05-22-2005 21:41:12




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I have heard some discussion regarding the damage that some independent PTO are subjected to from being shut off with high inertia rotating loads on the PTO, e.g. rotary cutters. Appparent the clutch pack in the independent PTO has to stop the rotation of the mower/stumpjumper/driveline and this imposes some high loads that can damage the clutch pack. This could be stopped by an ORC. So my question is these: Has anyone of you folks had any experience with this ? If so, how do you prevent it? Do you use an ORC?
Thanks in advance.

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Jerry/MT

05-24-2005 13:04:58




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 Re: ORC for an Independent PTO in reply to Jerry/MT, 05-22-2005 21:41:12  
Thanks for the input Hugh and Dieselrider. I do not disconnect the PTO under power so I guess I should be OK. Just wanted to check on other folks experience in this matter. Thanks again.



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Dieselrider

05-23-2005 03:45:33




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 Re: ORC for an Independent PTO in reply to Jerry/MT, 05-22-2005 21:41:12  
I agree with Hugh, that's what I do is idle her down before disengaging the ipto. I found this out with my JD and my rotary cutter. I was used to just shutting it off with my other tractor that doesn't have a brake but, with the brake on the JD it would stop so quick the shear pin would break. So it dawned on me to idle down before disengaging or replace alot of shear pins. Although an ORC should also work.

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Hugh MacKay

05-23-2005 02:10:49




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 Re: ORC for an Independent PTO in reply to Jerry/MT, 05-22-2005 21:41:12  
Jerry: Most IPTO have a brake to stop shaft when disengaged. I would think the brake is what would suffer the most damage. Most of the implements being built in the past 40 years have built in ORC. I'm thinking now of ones I owned like baler, haybine, forage harvester, etc. I have never owned a rotary cutter, but understand most don't have an ORC. The few times I've run something like this I always made a practice of throttling down before disengaging IPTO. Most of the IPTO out of the 1950s and early 60s brake could be controlled by not completely disengaging PTO. Example of this is Farmalls 300 through to 560. You could feel presure at both ends of PTO lever travel. At the engaged end it was clutch pack and at other end it was brake. There is a halfway point where shaft turns relatively free. The later hydraulically controlled IPTO didn't give you much control over this.

My practice over the years was always throttle down regardless of implement before disengaging IPTO. It served me well, I had little IPTO problems with 6 IPTO tractors and close to 75,000 hours of use. The only exception was Farmall 560D, but one must remember that IPTO was engineered for about 70 hp and my 560 was cranking 90 hp. Those problems had nothing to do with ORC. I think if you use care and throttle down especially with those high momentum implements, you will have few problems.

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