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Harry Ferguson Tractors Discussion Forum
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How to get slower ground speed without slowing PTO

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Blue Camel

09-03-2003 11:34:18




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Has anyone ever heard of slowing down a TO-20 without slowing the PTO shaft by putting smaller diameter tires or wheels/tires on the rear? Has anyone done it? I have a friend who has a TO-20 and is using a small sickle mower with it. The mower is having trouble keeping up and so he is thinking that slowing the ground speed of the tractor might be the answer.

Let me know what you think - Thanks

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Jerry/MT

09-03-2003 18:33:49




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 Re: How to get slower ground speed without slowing in reply to Blue Camel, 09-03-2003 11:34:18  
Blue Camel:
The PTO speed is independent of the ground speed and directly proportional to the engine speed. An independent or a live PTO's speed is also directly proportional to engine speed. The only thing I can think of that will give you some lower gears is a Sherman Transmission which is an add on to the tractor to give you some differnt gear ratios. I don't know if they are still being made but you might find one in an older tractor or check the salvage yards. Good Luck!

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Rotten Robert

09-03-2003 17:13:57




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 Re: How to get slower ground speed without slowing in reply to Blue Camel, 09-03-2003 11:34:18  
You say a ferguson TO-20? If this is a tractor with both a engine and ground speed selector lever put it in engine PTO, down shift s necessary for control in tight areas and with no tach run about 3/4 throttle. I pulled a NO. 5 JD sickle bar on a 8N when I was a kid with no problem. Ran it in 3rd gear.



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Ken n Alabama

09-03-2003 15:13:33




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 Re: How to get slower ground speed without slowing in reply to Blue Camel, 09-03-2003 11:34:18  
I have the same problem. The PTO is regulated by the engine RPM. In order to get the PTO speed where it needs to be to operate many implements, including the mower, the RPM must be 'bout half way (I don't have a Tach). That RPM carries a lot of ground speed even in first gear. I have been looking for a way to slow it down as well. I have heard everything from replacing the gears (expensive!) to using smaller tires. I haven't heard a good solution yet. If you hear one, please pass it along!

Ken

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Jerry/MT

09-03-2003 11:42:58




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 Re: How to get slower ground speed without slowing in reply to Blue Camel, 09-03-2003 11:34:18  
Blue Camel:
Seems to me that downshifting would be a lot easier and cheaper!



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Blue Camel

09-03-2003 14:47:51




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 Re: Re: How to get slower ground speed without slo in reply to Jerry/MT, 09-03-2003 11:42:58  
Yes, that would be cheaper but it also slows the PTO down proportionately. (Besides, he is already in 1st gear) If he had live PTO, then simply shifting up or down would change the ground speed without changing the PTO speed. As it is, he is trying to get by with using his older tractor and is doing some thinking outside the box to find ways to make it more useful to him.



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Terry G

09-03-2003 14:56:01




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 Re: Re: Re: How to get slower ground speed without in reply to Blue Camel, 09-03-2003 14:47:51  
If this is the case, how fast does the PTO turn when the transmission is in neutral? I always thought the pto speed was independent of the ground speed of the tractor.
Terry G



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John

09-03-2003 15:24:05




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 Re: Re: Re: Re: How to get slower ground speed wit in reply to Terry G, 09-03-2003 14:56:01  
Just thinking more about your problem, is this friend of yours using something odd in the way of a mower, because every mower for a tractor I have seen that is PTO driven will comfortably cope with cutting. just one other way to change speed I just thought about is try to get different size pulleys for the mower, in fact some mowers I have seen do have a fast and slow drive built in,and you change the drive belt into the next groove to change speed...just a thought....Best of luck with it...John

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john(UK)

09-03-2003 15:17:58




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 Re: Re: Re: Re: How to get slower ground speed wit in reply to Terry G, 09-03-2003 14:56:01  
It is independant of the ground speed of the tractor, its driven by the engine so it works in relation to engine speed, maybe they are getting mixed up with ground speed PTO as fitted to some early 35 models. You used to be able to get 9 x 28 tyres at one time they had a smaller rolling radius than 10" or 11" x 28, maybe if you could find some of those that might do the trick, only other way would be to fit a reduction box of some make, that would do it but it may be too drastic then.

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Blue Camel

09-03-2003 18:26:16




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 Re: Re: Re: Re: Re: How to get slower ground speed in reply to john(UK), 09-03-2003 15:17:58  
Thanks for all the input. Just to clarify, I am not saying that my friend's tractor has a ground speed PTO. It is just that when you have the tractor engine at PTO operating speed, even 1st gear is too fast for him at that engine RPM. Without independent PTO he cannot increase the PTO speed by increasing throttle without also increasing the ground speed which defeats his purpose. As someone's comment inferred, it may well be that he simply needs to do some work on the sickle bar mower as many people are able to use them without any trouble.

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John

09-04-2003 11:16:47




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 Re: Re: Re: Re: Re: Re: How to get slower ground s in reply to Blue Camel, 09-03-2003 18:26:16  
Actually even if he did have independant PTO it would still not work out, because you still use the engine speed to control the pto speed its just that you can control driving the PTO independantly you can stop and start it no matter what the tractor is doing but you cant change the PTO speed without changing the engine speed. and very often a sickle bar mower will be running too fast if it is running at PTO speed, so has he tried slowing the engine down to see if he can get a compromise on speeds between the mower and the tractor. Sickle bar mowers can shake too much at PTO speed so you run the engine speed untill it runs comfortably.

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