Power Beyond - Operation Question

[jenkinsph]

I should point out that using the hydraulics with heavy loads while driving on grades is a good reason to have the higher horsepower tractor models. For example a 4720 will do a better job of maintaining its speed under travel with a high hydraulic load than a 4120 will.

 

[AKfish]

AKfish,
The difference is the 110tlb has a much larger hydraulic system about 30 gpm at a maximum pressure of 3000 psi while having a relatively small engine at 43hp. So the hydraulic system is a major load on the 110. My 4520 with 60 hp has a 17 gpm pump running at a maximum pressure of 2500psi. This is what makes the difference in your case.

Steve, I can appreciate the power requirement's necessary to drive a 24gpm system @ 3000psi versus a 17gpm system @ 2500psi.

Most definitely, a 43hp tractor is going to labor to maintain that flow level versus a 60hp machine having to maintain a lesser flow level.

However, the real basis for my pessimism with Dave's idea is pretty simple and it's based upon the "open system" sump of these machines.

Try this on your 110 -- lower the stabilizers, move the tractor forward @ 1,300-1,400rpm and retract both stabilizers. What happens?

Dave's tractor is a 3720... with approx. 8.6 gpm implement pump capacity @ 2500psi.

AKfish

 

[Spudland_Dave]

So, my question remains unanswered - in a real world application - what work would/could be accomplished...?

AKfish

I concur.....

About the only thing I can say is this real world example. The chute rotator hyd motor on my snowblower is of similar size & type I would need to run what I have envisioned...currently Its plumbed into the 3rd SCV and I can use the motor no problem while using the blower & tractor in motion... Now of course I only use it momentarily...so like you said..in the real world, what would sustained use do?
I also got 2 roads I can go with this project..
A) Mechanical drive...I hate to do this because I prefer to have the variable speed of hydaulic drive.
B) Self contained hydraulic system, PTO drive...

I'm in no rush to find out...with a family addition scheduled for delivery mid July, fab time will be virtually Zero i'm sure. This was more a theory of operation question, and It looks like I'm not the only one wondering!