PTO Hydraulic Pump - How much does it change the output HP?

MinnesotaJ · Jul 5, 2017

Question for you guys, as I am trying to think bout the physics of my tractor. I have a Massey Super 90, which is rigged up with a hydraulic pump to operate the loader. I want to attach a bush hog and tiller to the tractor on occasion. A couple questions:

- How much do you think routing the power through the pump impacts the PTO HP? It is tested at 68HP from the PTO. I have to imagine that if I hook an implement up through the PTO pump, I'm no longer at 68HP. Think I lose 20%? 50%?

- I bought a male spline that is compatible with my pump as well as the implements, but I don't see any way for the spline to lock into the tractor. Is there a way around this? Different spline?

Thanks in advance. I always appreciate any advice I can get here.

old · Jul 5, 2017

Hyd pump will not impact HP any as long as your not using hyd powder all your doing is pretty much free spinning the pump when you not using hyd power. As for the adapter yoU have it is likely to have a bolt hole to hold it on if it does not cause a PROBLEM WITH THE PUMP THAT IS OR YOU MAY NEED A DIFFERENT ONE

Aaron SEIA · Jul 5, 2017

I'm with Old. You may lose a horse or two just from spinning the pump, but if you are not using any hyd functions, you really aren't using power. I would be worried a little about hanging a PTO shaft on the end of a longer shaft to go through the pump. I see bad drive line wobble leading to catastrophic failure of the adapter.
AaronSEIA

buickanddeere · Jul 5, 2017

How about adding the factory pump and not use a pto pump? Parts source is here . http://www.yesterdaystractors.com/Massey-Ferguson-Super-90-Tractor-Parts.html

David G · Jul 5, 2017

I doubt you would lose more than a fraction of HP due to pump idling, but will lost HP to work pump.

Rule of thumb, is 1HP per 1 GPM @ 1500 PSI.

MSM · Jul 5, 2017

If you decide to go this route with the pto through shaft,remember to shorten the drive shafts on your pto equipment so you don't bottom the shafts out or break the pto stub shaft on the tractor when you raise the implement...

gene bender · Jul 5, 2017

Where did that come from because if thats true when i raise my cult on the Cub the tractor would stop moving as i raise it

David G · Jul 5, 2017

Put a flow and pressure meter on it, bet you can calculate the HP needed, I bet there is a pretty good pressure spike when first lifting the cultivator and getting the flow going. Hydraulics is just like electrics, compare it to locked rotor amps, versus running amps.

rrlund · Jul 5, 2017

My 1365 Oliver has a PTO pump for the loader. It's not even noticeable when I engage the PTO.

jm. · Jul 5, 2017

73 years old and just MY EXPEIENCED talking you do not want to do what you are doing. The up and down of the implements on the longer shaft will wreck things pretty quick. As for power loss you would never notice it but from physical los of pto shaft it could get costly quick.

Traditional Farmer · Jul 6, 2017

With an open system it won't take much HP to let it run when not using it but if you have a good strong pump and go to lift something heavy you'll notice the change in the engine buts only while the lifting is happening,on the other hand if its constant like a hydraulic motor running something it'll be pulling all the time.

MinnesotaJ · Jul 6, 2017

Thanks, everyone. Really good advice. I am going to be careful with this, make sure the PTO shaft lengths are OK, and start figuring out how to do more of a factory-type system so I don't have to mess with this long-term.

PTO Hydraulic Pump - How much does it change the output HP?

MinnesotaJ

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old

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Aaron SEIA

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buickanddeere

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David G

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MSM

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