pto ?

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pto ?

Postby mike p » Wed Apr 20, 2011 3:58 am

so im told my 1959 800 case on LP is a 55 HP
im wanting to conect pto to a line shaft to run my wood shop so what rpm do i need to get 200 pto speed ?
& what HP will i have at 200 pto speed?
thanks
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Re: pto ?

Postby Gary Dotson » Wed Apr 20, 2011 5:50 am

You need to determine the engine RPM at 540 PTO RPM and just do the math. Does the tractor have a working tach? If not, the info would be in the owners manual, if you have one of those. You could also use a hand held tach to find your RPM. It's hard to guess the HP at that RPM, not a lot, I'd say.
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Re: pto ?

Postby Eugene » Wed Apr 20, 2011 8:50 am

Sounds like an interesting project. Do you have photos and an explaination on how the set up and wood shop works?

((Some guesses)) Most tractors, 540 pto rpms is at or very close to engine full throttle. The desired 200 rpms is 37 percent of 540. If the engine's full throttle setting is 2000 rpms - 37 percent of 2000 rpms is 740 which is a bit above engine low idle.

If you can find the horsepower/torque chart for the engine you can get a good idea of the available hp. Another wild guess - probably 25 - maybe 35 hp on the pto at 200 pto rpms.

Hand held tach and some throttle adjustments would be required to get exactly to 200 pto rpms.
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Re: pto ?

Postby Eugene » Wed Apr 20, 2011 5:55 pm

What originally powered the line shaft in the wood shop?

Suggest trying to determine the minimum amount of torque in foot pounds to power the line shaft/shop. Once the torque is determined then you can figure out the required horsepower at the 200 rpms.
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Re: pto ?

Postby mike p » Wed Apr 20, 2011 7:12 pm

well im setting up my planer a 1925 cresent orignaly took a 15 hp motor that i dont have , but this model also came in line shaft drive & it has the flat belt pulley on it
i allso have an air compressor that requires a 15 hp motor that i dont have & a hal brown tablesaw 1913 that s line driven. im looking for an old big jointer. my wood lathe & 2 metal lathes are line driven
so a line shaft looks like the ticket 25-30 hp would probly be enough as dont run all at once .
i thought the LP tractor at fast idle or a little above would be fair on fuel . & LP is a lot cheaper than gas.
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Re: pto ?

Postby Jim Becker » Wed Apr 20, 2011 10:17 pm

My thoughts are similar to what Eugene said. The reference I checked said the Case 800 engine runs at 1800 rpm. To get 200 rpm at the PTO, the engine would have to idle down to about 650 RPM. Even IF it would idle that low, and IF it had as much torque at that speed as it does at 1800, the horsepower would only be 37% of the rated 55 which is about 20. In reality, torque at that speed would be probably 1/2 or 1/3 of that it is at 1800. In other words, it might be good for 7 to 10 horsepower at the speed you are looking at.

If you want this to work, what you need to do is put a speed reduction between your PTO and the line shaft. I suggest you use a heavy roller chain and sprockets of an appropriate size.
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Re: pto ?

Postby Eugene » Thu Apr 21, 2011 9:03 am

I looked for a photo of a "speed Jack" on the internet. Couldn't find one.

A speed jack is a manual transmission converted to handle either a tractor pto or tractor belt on the transmission input. The output end of the transmission was converted to power either a grain auger or elevator. The speed jack was mounted in a metal frame, transportable, and staked to the ground when in operation. There use to be a number of speed jacks in the Midwest during the 1950's and 60's.

I have several old Popular Mechanics books in which farmers used pto powered manual transmissions to power any number of farm implements. They also use old differentials to change the power direction and as a speed reduction.

While back was talking to a neighbor who was installing a cedar (tree) chipping mill. The mill could be powered with an electric motor or tractor pto powered. Electricty is a much cheaper power source.
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Re: pto ?

Postby mike p » Tue Apr 26, 2011 5:24 am

Electricty is a much cheaper power source.
not when you need 2 15 hp motors & multiple 2 hp & have none
most of this equipment was factory set up as line shaft drive
then a 3ph RPC
to have that id need 220 v in shop $500. to power co
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Re: pto ?

Postby SONNY » Tue Apr 26, 2011 11:36 am

Not all tractors run at actual 540 rpm.---MOST run from 450 to 500 range wide open, MM tractors ran at 650, so you need to do tach. test on the tractor in question, and do the math from that figure!---also how sensitive is your governor? ---if it is not super sensitive at low rpm, you wont have any luck in controlling the shaft.---you need to put in some sort of speed reducer to at least keep half throttle on the tractor for best control and economy plus having plenty of power for even speed on the shaft!---I can be done, AND will work! (I have done it before). thanks; sonny
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