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Implement Alley Discussion Forum

Help me understand PTO speeds

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BobinIL

01-03-2018 07:34:36




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I apologize if this has been beat to death on here but I want to understand how the 1000 rpm PTO works vs the 540 rpm PTO. The way I understand it is, On the Tach of the tractor there is a line that says (PTO) it is usually around 1400-1800 rpm engine speed depending on the brand of tractor. so if I run my tractor up to this mark lets say 1800 rpm engine speed my PTO shaft will be turning either 540rpm or 1000rpm depending on which shaft I have. So if I have a mower set up to spin the blades at 500rpm for optimal performance the mower gear box would be almost a 1 to 1 gearing for a 540 PTO. But if I put an adapter on to hook it up to a tractor with a 1000 PTO at the designated 1800 rpm engine speed I will be turning the mower blades twice the RPM recommended causing possible mayhem. Therefore I would have to reduce the engine speed to about 900rpm to make the mower blades turn at the correct speed.

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rustyplow

01-03-2018 10:07:11




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 Re: Help me understand PTO speeds in reply to BobinIL, 01-03-2018 07:34:36  
I had an IH 826 for awhile that I did just that. made up a shaft to run the haybine and baler off the 1000 pto No one run it but me. I wouldn't want to put anyone else on it unless I was sure they knew what they were doing.



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paul

01-03-2018 08:53:51




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 Re: Help me understand PTO speeds in reply to BobinIL, 01-03-2018 07:34:36  
Well, yes, but generally 540 pto is for smaller stuff under 75hp, and 1000pto is for bigger tractors and implements over 75hp.

So, it's not real common to be doing it the way you say. Sometimes we run a 540 implement with a bigger tractor with an adaptor from 1000, and then as you say you need to ripen the throttle about 1/2 speed or bad things can happen.

If you have a tractor near that 75hp size and it came with interchangeable output shafts, they are geared differently and will spin the correct speed at pto settings.

Paul

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Texasmark1

01-08-2018 07:50:34




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 Re: Help me understand PTO speeds in reply to paul, 01-03-2018 08:53:51  
I had a JD 4010, about 70 hp and a 4020, about 100 hp. One of them, maybe both, but at least one had a spare PTO shaft that you could easily exchange if running a 1000 implement.

Only 1000 rpm implement I recall, many many years ago was a neighbor's belt driven hammer mill, which as I recall was driven by his JD B off the right side of the tractor using about a 20' 6(ish)" wide belt.



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DeltaRed

01-03-2018 07:40:28




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 Re: Help me understand PTO speeds in reply to BobinIL, 01-03-2018 07:34:36  
Yep,you got it. to run a 540 rpm implement on a 1000 rpm tractor,you will need to cut the tractor rpm in half. Run it at half throttle.



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Texasmark1

01-15-2018 07:03:15




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 Re: Help me understand PTO speeds in reply to DeltaRed, 01-03-2018 07:40:28  
I had an 8' twin blade mower that I ran behind my tractor with the 1000 PTO shaft adapter....now that I recall the instance, it was on the 4020. I did as you said, cut the rpms down to half normal PTO speed and away I went. Just happened to be this mower and this tractor whereby I got high centered on a terrace and before I could realize what was happening, I took out the center gear box. Finding a replacement at a reasonable price was impossible. No I don't remember why my protective device failed, nor which kind it was, slip clutch or shear bolt.

After that occurrence, I paid more attention to gearbox rating vs driving tractor hp and ensuring that the protective device was functioning properly.

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rrlund

01-03-2018 08:10:41




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 Re: Help me understand PTO speeds in reply to DeltaRed, 01-03-2018 07:40:28  
Depends on the tractor and which shaft you have in it. My 2-135 White runs the 1000 shaft at 2200 engine rpms,and the 540 shaft at 1700 engine rpms.



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