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PTO Horsepower and Generator Question
My John Deere 4410 is equipped with the ehydro trans. and is rated at 28.5 hp PTO horsepower. Equipped with the power reverser transmission it is rated at 30 PTO horsepower.
My question is.......if the tractor sits stationary running a PTO generator; would my ehydro equipped 4410 develop the rated 28.5 PTO hp or the 30 PTO hp that the power reverser equipped tractor would develop. I understand that there is going to be a PTO hp loss due to the ehydro trans. and parasitic power train loss; but it this PTO hp loss all the time or when the ehydro trans is operating too.
I always thought that the PTO was hard geared to the engine, where as the ehydro runs off the hyd. pump which caused the parasitic hp loss. I would think that my 4410 parked with the gear range selector in Neutral would make the full 30 PTO hp. Which is the case? Can one of you shead some light on this issue as I would like to get the largest possible PTO generator my tractor can safely run without overloading it.
It would be for emergency use only which has been once in 11 years that a generator was needed. We get very little snow. Hooking up the tractor to a PTO generator mounted on steel rails or heavy pallet/wood blocks would be very simple and straight forward. I already keep about 100 gallons of diesel stored at the house anyway; it gets used in the tractor so it won't sit long enough to go bad. I plan to run the generator maybe 8 to 12 hours in any given day MAX, so I would not run up a ton of hours on my tractor over a period of years. I purchased a Generac 5 Kw gas generator back in 1994 after a freak ice storm took out the power for months around here for many. I have never used the generator since. If I had to use the this generator in the event of a power outage, I have doubts about how readily this generator would start after setting for so long. I always have a certain amount of gas on hand but not enough to last for very long if needed. I would think, in my case the PTO genny would be the way to go.
All I would need to do is hire an electrician to install a switch panel and hook up for the genny. What do you guys think? Is my reasoning sound, and to recap; what are your thoughts on actual PTO hp. produced from a stationary tractor. Sorry about the lengthy post.
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PTO Horsepower and Generator Question
By the way. I just realized that the above post is my 800th post. 
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PTO Horsepower and Generator Question
On average, I have been burning about 2.5 gallons per hour. I put about 50 hours on her so far this season and figure I will probably put another 10 - 20 before winter. Then it will probably sit for most of the winter. I imagine that I would go through a 100 gallons a season. I also keep 10 - 15 gallons of green dyed road taxed diesel too so I can put off a trip to the Flying J since it is a 70 mile round trip. I can save about 15 -20 cents a gallon there.
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PTO Horsepower and Generator Question
Harvey,
I am on the same sheet of music with you right down the line! Great minds think alike ehh? At least when my CRS is not flaring up. 
But Harvey.........you forgot to say what you thought about my big question. Does the ehydro tractor PTO still produce 28.5 PTO hp even though it is parked in neutral. Or does it produce the 30 PTO hp that the power reverser transmission tractor makes?
I have been thinking more about it now and I see that the hydro pump is hard linked to the engine and is turning all the time, so maybe that is where the 1.5 hp goes. I guess I am thinking that I can get away with a 15kw PTO generator or if I can find one a 14kw. Monday I will call my dealer and ask them this question as well. Thanks for the reply Harvey.
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PTO Horsepower and Generator Question
I did found the horsepower to kW requirement formula I was looking for. Granted these formulas are applicable for marine generator use, but kW is a kW and hp is hp. Should be the same requirements for our tractors. According to this formula (predicated upon an 80% generator efficiency rating) a 17kW generator would require 28.5 PTO hp. The chart states to use 93% efficiency if unknown so I use 80% to be safe. Just the size I was looking at. 17kW should be more than plenty for my needs. But it would still be interesting to find out exactly how much hp is lost with a stationary tractor? Sorry if I am getting into too much nitty gritty. I guess my test pilot and maintenance background is slipping through. Reminds me of when I used to do maximum power checks at altitude and having to figure the engine and aircraft torque factors using the charts and formulas. Don't miss that one bit either
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PTO Horsepower and Generator Question
Doc, I bought a 20 ton log splitter from Harbor Freight with Honda 5 hp engine. Get the Honda those things run for ever and are real good on gas consumption. Mine has a 1 gal. tank and will run all day and not run out. I think I paid about $850 for mine but that was about 8 or so years ago. I would take a look at the hyd. control valve though. The valve that came on mine was an El Cheapo and jammed up after 2 seasons. I had to install a new valve and has been running good every since. When you do your 50 hour tractor service, save the hyguard oil. It makes GREAT hyd. log splitter oil. That is what I did with mine. As soon as you get one, everyone around you will want to borrow it. I learned my lesson on loaning stuff out. That is fodder for another thread.
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PTO Horsepower and Generator Question
Dave,
Harbor Frieght is online. With shipping charges and taxes they are usually a little cheaper but not always. Homier also sells this kinda stuff too. www.homier.com
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