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Tractor Talk Discussion Forum

PTO/RPM

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oldcraneguy

04-01-2007 08:22:34




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Not being a farmer Ive not delt with tractor PTOs much and Im curious, one of our little tractors (jinma 23hp} has a 540 and 1000 rpm pto. Is that full throttle rpms? and which is more appropriate for a 4' bush hog? Or is it just a matter of how heavy the brush is or vibration. Most of the stuff we cut with it is light and cuts fine in 1000 range at half throttle. Just wondering if there are any set rpms for particular attachements? thanx Don

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paul

04-01-2007 14:00:34




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 Re: PTO/RPM in reply to oldcraneguy, 04-01-2007 08:22:34  
Most typical implements are designed for 540 pto speed, and you will blow things apart running them at full 1000 rpm. Can be very dangerous.

Rated pto speed is typically as slightly less than full throttle, as you';ll see on the tach.

If the tractor can pull it, running at 1/2 throttle in 1000 rpm mode is ok with the typical 540 rpm implement. Just do not forget, & go to full throttle!!!!!

I repeat, that can be very dangerous.


--->Paul

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135 Fan

04-01-2007 10:06:57




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 Re: PTO/RPM in reply to oldcraneguy, 04-01-2007 08:22:34  
Like old said, use 540 only. There should be a selector for 540 or 1000 rpm if it's the same shaft. 1000 rpm is usually only used on tractors approaching 100 hp for implements like large balers and such. 1000 rpms on a compact tractor would be used for things like a belly mower etc. A 540 shaft is 1 3/8 six spline and 1000 is 21 spline I believe. All compact implements that go on the 3 pt. should be 540 rpm unless they are a special attachment that runs at 1000 rpm. Your manual should specify engine rpm for 540 pto rpm. If you don't have the manual and the tach doesn't say, it is usually about 3/4 throttle or slightly more if heavy going. Dave

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Pete in MD

04-01-2007 09:23:02




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 Re: PTO/RPM in reply to oldcraneguy, 04-01-2007 08:22:34  
Look at your tach. There should be a mark,[PTO], for engine RPMs to give you 540 or 1000 RPMs at the PTO.



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oldcraneguy

04-01-2007 09:28:39




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 Re: PTO/RPM in reply to Pete in MD, 04-01-2007 09:23:02  
Never even thought bout checkin the tach for a pto setting, I'll check it out when I get back up there, bet I could find this info in owners manual if I dig that thing up...lol thanx Don



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RP3

04-01-2007 09:22:24




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 Re: PTO/RPM in reply to oldcraneguy, 04-01-2007 08:22:34  
The orginal "standard" PTO speed was 540rpm and the gears to drive it were designed to give this speed at an optimum rpm for the particular engine of the tractor (generally at about 3/4 throttle).

SInce horse power is torque x rpm, at 540 rpm the torque required to deliver really high levels of power to an implement would require an enormous PTO shaft to prevent twisting it off. Therefore, the 1000rpm PTO standard was developed.

At the higher shaft speed, only about 1/2 of the torque is needed to deliver the same power to the implement. The implements that use it are designed for the higher speed and compensate for the higher rpm with their internal gearing.

A 4 foot mower will likely be designed for a 540rpm PTO speed. I suspect the shaft will not even fit to the 1000 output shaft on the tractor.

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gene bender

04-01-2007 09:03:18




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 Re: PTO/RPM in reply to oldcraneguy, 04-01-2007 08:22:34  
The pto shafts should be different sizes for the 540 to the 1000 so you cant get the wrong speed on the unit you are using. Just what kind of mower are you using. Better check to make sure you have the correct set-up. Using wrong speed can be danger.



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oldcraneguy

04-01-2007 09:23:05




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 Re: PTO/RPM in reply to gene bender, 04-01-2007 09:03:18  
The bush hog weve got is old and rusty with no identifying marks or tags, it came with the 8n we bought that now has a box blade on it. the reason Ive been running it in the 1000 range is just to keep engine revs down and still cut the weeds, I typically run the engine at 13-1400 rpms, it cuts fine with little vibration.n If I get into heavier weeds I usually just drop the tractor down a gear.

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old

04-01-2007 09:39:15




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 Re: PTO/RPM in reply to oldcraneguy, 04-01-2007 09:23:05  
It that hog was used with an 8N then it was made to be run with a 540 PTO and if your running it on a 1000PTO your looking for big trouble. Slow it down or you may end up haveing a blade go fling which will not be good. Those blade can and do brake some times and if your does and its spinning twice as fast as it should and it hits some thing or some one that would be bad news. I once had a blade brake on my hog and we never did find the part that broke. So what I'm saying is STOP useing the 1000 RPM PTO on that brush hog before you or some one else gets hurt

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buickanddeere

04-01-2007 12:52:55




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 Re: PTO/RPM in reply to old, 04-01-2007 09:39:15  
He's using the 540 shaft with the pto shifted to 1000rpm but runnung the engine at 1/2 rpms. Works good with pto generators overnight with light loads etc.



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olddog

04-01-2007 14:58:29




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 Re: PTO/RPM in reply to buickanddeere, 04-01-2007 12:52:55  
Probably 'hoggin' along @ half thottle on a 4' brushhog, listening to the hog and engine, you would be able to judge how hard (even as a novice) you were working the system. However, I would respectfully DISAGREE with you about running a generator designed for 540 on 1000 rpm at 1/2 throttle. Mebbe "light loads" for light bulbs, etc, but how about a bulk tank full of milk (store shelf value $3000/5000 or more)! Don't care how many HP your tractor has at half throttle, the governors are still too slow for electric(ity). BTDT, as a serviceman for Mueller bulk tanks. When you have the contactors chatter (and burn out; to include any solid state PC Boards) on a compressor and every light in the barn flashing (and everything else that's running) ,you will see my point. Pay the man. That's some money you have saved. RUN THE STANDBY GENERATORS AT THE CORRECT RPM!!!! Lord, I 'poligize to the starvin' pygmys in NewGuinea fer me rant on this'un, but hope to save a contactor,compressor or2, or your $)

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buickanddeere

04-02-2007 07:43:39




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 Re: PTO/RPM in reply to olddog, 04-01-2007 14:58:29  
I said light loads. Eg. yard lights, pipe heat trace, house furnace, fidge or well pump. Any dingaling that tries running large or large conpressor motors or heavy loads with the 1/2 engine rpm 1000rpm on a 540rpm generator deserves what they get.



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