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Tractor Talk Discussion Forum

Pump requirments

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Truth seeker

03-05-2006 10:25:08




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Hi!
I'm still toying with the idea of a trucktor. (NO its not a tractor REPLACMENT)
What GPM and PSI would a hydrualic pump need to power a hydraulic motor, to turn a PTO to run, say, a square baler? a Brushhog? etc.? Thanks!




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Bob

03-05-2006 13:29:09




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 Re: Pump requirments in reply to Truth seeker, 03-05-2006 10:25:08  
Many mower-conditioners use a pump that slides over the tractor's PTO and delivers oil back to a motor that operates the conditioner.

If you could find a bashed-up conditioner that has a working pump and motor, you could use them for the uses you mention.

Typically, the mower conditioner's hitch tongue serves as the hydraulic oil reservoir, which has a lot of oil capacity, and a lot of exposed surface area to radiate heat. For your application, you would likely need an oil cooler.

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Coloken

03-05-2006 12:18:56




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 Re: Pump requirments in reply to Truth seeker, 03-05-2006 10:25:08  
IHC did this at one time. Pump on the PTO, motor on the bailer. Instead of engine. You are talking large HP requirements and much money..



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RustyFarmall

03-05-2006 14:53:47




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 Re: Pump requirments in reply to Coloken, 03-05-2006 12:18:56  
Ken, are you sure about that? I think it was the IH electral generator that was used to power an electric motor on the baler.



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woodache

03-05-2006 12:12:32




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 Totaly Impractial thats why Re: Pump requirments in reply to Truth seeker, 03-05-2006 10:25:08  
Totaly Impractial thats why its NOT done. 1. its going to be expensive, a pump large enough and the correct type to run a baler that may only require 25 HP could run as much as $10,000 USD a motor could cost up to $5,000. Of course you may have obtained some surplus for a pickup price but what about repairs.
2. There is just to much power lost as heat in that type of Hyd system.



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Bob

03-05-2006 13:31:53




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 Re: Totaly Impractial thats why Re: Pump requirmen in reply to woodache, 03-05-2006 12:12:32  
Woodache,

For one example where it IS done, and IS practical to run a PTO load hydraulically, see my post above about mower-conditioners. For example, a 14' or 16' conditioner would certainly require as much HP as a baler.



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MN Bob

03-05-2006 11:45:20




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 Re: Pump requirments in reply to Truth seeker, 03-05-2006 10:25:08  
If you are going to use a truck to run these, I have a suggestion. If you do not already have the tructor built. How about the salvage yards for a truck that had PTO option? Then using the parts salvaged, you could build one, that might be simpler. Just a thought, but you will still need to adjust to the correct PTO speed, 540 or 1000?



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J. Schwiebert

03-05-2006 11:12:47




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 Re: Pump requirments in reply to Truth seeker, 03-05-2006 10:25:08  
Also remember all pumps are rated on theoretical displacement and rated GPM are at one speed which you will see if you use the formulas that were posted. Also hydraulic motors are rated the same way. Use 85% effeciency to do your calculations. Also how long are you going to be turning the PTO? Heat disapation will be a factor. Gear pumps and motors will have more pressure capacity and will cost more money. You will need at least 3 times pump output for reservoir size or a huge cooler plus you might still need a cooler since you are thinking of continous duty application while the PTO is running. Also what type of motor are planning on and have you calculated the horse power necessary. Remember hydraulic motors are rated in either inch pound or larger ones foot pounds of torque/ Your turn for questions?

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Joe(TX)

03-05-2006 10:42:27




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 Re: Pump requirments in reply to Truth seeker, 03-05-2006 10:25:08  
There are a lot of variables. How much horsepower do you need? What is the motor displacement? 540 or 1000 rpm pto? Pump rpm? pump displacement?
You have to match the pump and motor to the application.

psi X gpm / 1714 = hp
cu in X rpm / 231 = gpm



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Truth seeker

03-07-2006 09:21:36




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 Re: Pump requirments in reply to Joe(TX), 03-05-2006 10:42:27  
Hi!
Sorry that I haven't replied sooner!
I'd probably use a 500rpm pto speed. I don't NEED, it to power a baler, BUT it would be NICE to have the capability to run one. But I'd at least like it to be able to power a bushhog, tedder, rake, spreader, or maybe even a drum mower! I'm not 100% sure what type of motor, but the above list kinda shows what I'm thinking of.
The engine in the trucktor (to be) is a 90hp toyota 22r.
I like the idea of finding a bashed up conditioner!
Thanks for all of your responses! Thanks Joe(TX) ! I found some on ebay that I think would be sufficient!

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