PSI/RPM curve for BX 25

[prichard]

What about the curve? What pressures in between?

 

[Luke'sScreenName]

My MX4800 is the same way. Always makes me chuckle when someone regurgitates the TBN dogma that RPMs don't dictate hydraulic force.

 

[dodge man]

There are a couple of things at play here, pressure and volume. I'm not sure but at idle even if the pressure is enough to run the hydraulics, my guess is the volume isn't enough. I know on my BX the hydraulics prettty much won't do anything unless you bring the engine up off idle to maybe 1800 rpms. Of course this thread is 6 years old also, but still relevant.

 

[Luke'sScreenName]

What about the curve? What pressures in between?

Here is the data points for my MX.



And a few hundred PSI make a much bigger real-world difference than one might think....

 

[David_Kb7uns]

For the first 1/4 to 1/3 throttle ALL hydraulic flow goes to power steering and charge pump circuit with barely any flow going to loader and then 3 point hitch.

Once you get flow above the flow required by the power steering you will start to see movement on the loader and 3 point hitch.

David

 

[Luke'sScreenName]

For the first 1/4 to 1/3 throttle ALL hydraulic flow goes to power steering and charge pump circuit with barely any flow going to loader and then 3 point hitch.

Once you get flow above the flow required by the power steering you will start to see movement on the loader and 3 point hitch.

David

That is not the case with either of the kubota's with loaders I have owned. :confused3: maybe I'm misunderstanding.

 

[4570Man]

That is not the case with either of the kubota's with loaders I have owned. :confused3: maybe I'm misunderstanding.

Our tractors have separate pumps for the steering.

 

[David_Kb7uns]

That is not the case with either of the kubota's with loaders I have owned. :confused3: maybe I'm misunderstanding.

Yes you are misunderstanding, my L3130 has a 2 section pump. First section is power steering and GST transmission supply, second section is implement/ loader.

Some of the larger Kubota TLBs have a third section for the backhoe swing.

David

 

[Luke'sScreenName]

Our tractors have separate pumps for the steering.

Sure. I assumed the BX25 had 2 pumps also... That's what I get for assuming.

 

[DK35vince]

My MX4800 is the same way. Always makes me chuckle when someone regurgitates the TBN dogma that RPMs don't dictate hydraulic force.

Lifting something to heavy and my loader will go into relief at idle, increasing RPM's makes little to no difference in lift power.