Priority Flow Divider Temporary Bypass??

Iplayfarmer · Feb 27, 2009

Is there a way to temporarily bypass a priority flow divider valve?

Here's the scenario. As discussed briefly over in the "Build it Yourself" forum, my tractor has a 4.8 GPM Hydraulic pump. 1.8 GPM goes to the power steering, and 3 GPM goes to the Loader, 3 pt., etc. I'm adding a Backhoe, and I won't be steering when I'm using the backhoe. Is there a way to modify the system so that when I'm using the backhoe, I can flip a switch or open a valve to get all of the hydraulic fluid flow to the backhoe?

kennyd · Feb 28, 2009

I would suggest a PTO pump...

Iplayfarmer · Feb 28, 2009

kennyd said:
I would suggest a PTO pump...

You're cheating.

I already know I can use a PTO pump. I'm just trying to explore this other option a bit. Mostly I'm just trying to understand it a little more.

RickB · Feb 28, 2009

You could put a manual diverter valve in the priority flow connection and divert that flow to a T in the backhoe supply. I can't imagine why that wouldn't work. Shouldn't be too much $$ to find out firsthand.

Iplayfarmer · Feb 28, 2009

RickB said:
You could put a manual diverter valve in the priority flow connection and divert that flow to a T in the backhoe supply. I can't imagine why that wouldn't work. Shouldn't be too much $$ to find out firsthand.

Makes sense. Would I actually need a diverter on both lines? One to send fluid from the power steering and one on the regular circuit to accept the fluid.

kennyd · Feb 28, 2009

I think Rick is thinking to put it just after the pump, before the PD so the whole pump output bypasses the tractor and goes to the BH. If you did this then all the hydraulic functions on the tractor would be inoperative and you would need to make sure the PRV's on the BH valve are set properly to avoid pump damage.

Iplayfarmer · Feb 28, 2009

kennyd said:
I think Rick is thinking to put it just after the pump, before the PD so the whole pump output bypasses the tractor and goes to the BH. If you did this then all the hydraulic functions on the tractor would be inoperative and you would need to make sure the PRV's on the BH valve are set properly to avoid pump damage.

I hadn't thought of bypassing the whole thing. It's not a bad idea. Part of the problem there is that I will be using the loader for part of the stability when I'm using the backhoe. Disabling it would be a problem.

The idea has got me thinking, though. Maybe I'll come up with something.

J_J · Feb 28, 2009

Iplayfarmer said:
I hadn't thought of bypassing the whole thing. It's not a bad idea. Part of the problem there is that I will be using the loader for part of the stability when I'm using the backhoe. Disabling it would be a problem.

The idea has got me thinking, though. Maybe I'll come up with something.

You could use something like this.

Burden Sales Surplus Center Item Detail

RickB · Mar 1, 2009

kennyd said:
I think Rick is thinking to put it just after the pump, before the PD so the whole pump output bypasses the tractor and goes to the BH. If you did this then all the hydraulic functions on the tractor would be inoperative and you would need to make sure the PRV's on the BH valve are set properly to avoid pump damage.

Actually, that is not what I was thinking. I proposed diverting the priority flow and combining it with the backhoe supply. Priority flow would be that portion of pump output sent to the power steering system by the priority valve.

quarencia · Mar 1, 2009

RickB, Are you proposing what is in the attached drawing? Most cuts and subs I've seen with Priority Diverters use the output from the power steering to charge the HST. I think cutting flow from the HST, even when you aren't moving, might be bad.

If Iplayfarmer's profile is correct, he has a Massey 1215. I'm not familiar with the flow paths on the 1215. Would want to make sure he doesn't cut fluid supply to the HST though. If his priority flow is ONLY feeding PS, then the diverter idea sounds pretty good.