third function value help with Kubota

[ovrszd]

I installed my Kubota OEM 3rd function using the kit supplied. Since the hoses were also supplied it was almost impossible to mess it up.

My 3rd function is fed from the loader valve PB. My 3rd function PB port feeds my 3pt.

My Grapple gets fed after the loader. I have enough flow with my tractor that I can use all three functions at once. The 3rd function being the slowest and having the least power while the loader functions are activated.

I can park my tractor with Grapple open and it never closes. I can also grip a large log and carry it or block it while the Grapple is holding it with no bleed off. The only time I have to repeat the grip on something is if carrying loose brush that compresses as it's carried. In that case might have to bump the close button once in a while to tighten grip.

 

[bandaidmd]

I installed my Kubota OEM 3rd function using the kit supplied. Since the hoses were also supplied it was almost impossible to mess it up.

My 3rd function is fed from the loader valve PB. My 3rd function PB port feeds my 3pt.

My Grapple gets fed after the loader. I have enough flow with my tractor that I can use all three functions at once. The 3rd function being the slowest and having the least power while the loader functions are activated.

I can park my tractor with Grapple open and it never closes. I can also grip a large log and carry it or block it while the Grapple is holding it with no bleed off. The only time I have to repeat the grip on something is if carrying loose brush that compresses as it's carried. In that case might have to bump the close button once in a while to tighten grip.

So the factory valve is always pressurized and uses solenoids instead of levers to select which port opens. I think i like that set up.

 

[J_J]

Nothing is pressurized until a cyl develops the pressure.

In an open center hyd system, fluid is always flowing through all series connected valves.

 

[ovrszd]

So the factory valve is always pressurized and uses solenoids instead of levers to select which port opens. I think i like that set up.

It uses solenoids, opened/closed by two buttons on the joystick. When neither button is pushed the fluid goes to PB.

As JJ said, there's no pressure until the flow meets resistance. So when neither solenoid is closed flow continues to the next item in line, which in my case is 3pt/rear remotes

Hmmmmm,,, now I had to think about this a little. bandaidmd, I think your interpretation is accurate. I think you understand what's happening. Just that hydraulic guys like JJ think differently than we do so his interpretation of pressurized is different than possibly ours. :thumbsup:

With a diverter valve system one or the other is susceptible to pressure/flow, but never both at once.

 

[J_J]

If you have a double solenoid valve, it will have 4 ports, and work the grapple when the button is selected.

If your valve has 6 ports, it is a diverter valve and uses the curl circuit for hyd.

I just can't see any 3rd function valve or diverter valve installed before the loader. The service guys from Messicks says it isn't so.

So someone is saying that the pump flow goes into the 3 function valve first. Show me some pictures. Please.

 

[beemerphile]

I just can't see any 3rd function valve or diverter valve installed before the loader. The service guys from Messicks says it isn't so.

So someone is saying that the pump flow goes into the 3 function valve first. Show me some pictures. Please.

"Someone" pulled this from his loader manual and the hose routing matches what is installed on "Someone's" machine. "Someone's" machine has the self-leveling valve. Unlike the standard valve, the self-leveling valve is supplied (the pump port) from the bottom. The PB (nearest) and tank (rear most) ports are both on top. The pressure line runs from pump to block inner port to 3FV to loader to block outer port to rear of machine. The instructions assume that one is adding the 3FV to an existing loader installation. The instructions say to disconnect the pump line hose. Figure 4 shows Hose (1) running from the pump block to the inlet of the 3FV. Hose (2) runs from the PB of the 3FV to the inlet (pump port) of the loader valve (where the pump line was removed in the above instruction). The PB line from the loader valve to the pump block is unchanged. The tank lines are merged.