HELP! Hydraulic flow advice!!

[Jtullis13]

Ok so I have several questions for the Hydraulic Specialist in this forum. I have a Yanmar 2210d that has a Koyer 120 loader that has a Dinoil valve on it. Initially the loader was plumbed from the gear driven hydraulic pump on the engine. The loader valve outflow powered the 3point, and the 3 point dumped back into the sump. Everything worked good. I wanted to add a PS kit from Fredricks/Hoye. This is how it was suppose to be plumbed, hydraulic pump to a divider valve (FRC51), the divider (FCR51) has 2 outflow ports that can be regulated by an external knob. One outflow supplies the PS, the other outflow supplies the loader valve. The loaders outflow still goes to 3point. The loader function and PS function are mediocre set up this way in my opinion, no offense Aaron. I was hoping for more function of both, but I also realize I haze a small tractor with small hydraulic pump. Anyways my thought was to plumb it the initial way it was, pump to loader, loader outflow to 3point, use the Power beyond to supply FCR51 valve which powers the PS, the other port on the FCR51 goes to sump. This way I now have individual 100% PS function and 100% loader function as long as I am not using the loader and PS at the same time. The loader takes priority over the PS. So when using the Loader I loose PS function, I am fine with that. The question is, my 3point no longer works unless I use my loader at the same time. So is the power beyond taking the flow from my loader valve outflow and not letting my 3point get any fluids while operating?? And by activating my loader I know stops flow from the power beyond, but does that allow the loader valve to direct fluid to the outflow of the loader valve to my 3point now?? Is there any way to get my 3point to work with the power beyond set up this way and not having to use the loader to get the 3point to work? Also could I be causing any back pressure by having it set up this way? Or causing any damage to anyting? Any help would be appreciated!! Thanks ahead of time! I tried to upload a diagram but wasn't sure how to get it to load, sorry.

 

[J_J]

If your hyd system is open center, the pump fluid passes through all valves in neutral, All valves should be in series.

The PB from each valve will pass the flow to the next valve.

So, if you do not have 3pt operation with the loader in neutral, you have things plumbed wrong.

When you are using the loader at max flow, the pump flow is going to the loader cyl and the cyl flow is going to tank.

When the loader is in neutral, the flow passes through the loader valve and goes to the next valve.

The PS should have priority.

 

[Jtullis13]

Thanks for responding JJ. I was hoping you would see this. Ok so I understand what you are saying about the flow in series, but I am not sure how else to plumb it. It was initially set up as this. Pump to loader valve with PB capped off, loader valves to loader functions, loader valve outflow to 3point. I thought I could use the PB to supply flow for the PS and have PS to sump and 3 point is still supplied by loader outflow. What do you suggest as a alternative to get the 3point working and have PS function? Thanks

 

[J_J]

Your loader should have been plumbed from pump to loader then from loader PB to 3pt.

If you capped the PB, the pump flow would exit the tank /out port to tank and no 3pt.

Your pump flow should go into the splitter and the priority circuit feed the PS.

The other side of the splitter will feed the loader and the loader PB should feed the 3pt.

If you have adjustable flow for the PS, then adjust the flow/speed to suit your needs. Feed more or less to the loader corcuit.

 

[Jtullis13]

Ok thanks JJ. So one more question. If I set it up that way where do I send the outflow from the loader valve? Send that to the sump tank?

 

[J_J]

The loader tank flow should go to the tank/return hose.

All tank/out ports from each valve should go to tank. PS out flow should go to tank.

You need a PB adapter in the PB port and then connect that port to the next valve IN port be it a remote valve or the 3pt. .

 

[Jtullis13]

Yep that is correct JJ. But if I hook it up the way you suggest I will loose some loader response. So here is my next question for you. What if I have pump to loader valve, PB to splitter valve, splitter to PS & 3pt, loader outflow to sump line or tank. The PS outflow to sump. This way would I have 100 loader response back, good PS flow and the 3pt would be slower but still work? How does that sound and would it work? Thanks.

 

[J_J]

You can do whatever, but I say steering should have priority.

If you are using all the pump flow for loader, you will have no steering no 3pt.

What is the problem with feeding the PS about 1 GPM with the rest of the flow going to the loader.

Most people don't use max flow on their tractors, only what is necessary to get the job done.

 

[Jtullis13]

I understand JJ. And with that the PS would still have priority over the 3pt. I know I would lose PS function when using the loader and I'm ok with that. But at least the loader and PS would be responsive at separate times and I would still have 3pt function just at a slower response. I was trust trying to get better or original loader response back and have good PS function too. The way it was designed affected loader response and poor PS function. So all in all the last method I sent should would on paper? Just need to try it.

 

[oldnslo]

for safety reasons the steering should always be the first item to receive flow. If something happens in one of the valves before the steering circuit while you are driving down the road you loose all steering.

There are more expensive and elaborate priority control valves that would allow flow to steering on demand and also provide full flow to your FEL when there is no or little steering demand. These are used on higher HP ag tractors and construction equipment.