3-Point Hitch Kubota B3000 crazy hydraulics

[CHDinCT]

Depending on what he wants to spend to fix this issue, I agree with Verticaltrx that buying a PTO driven hydraulic pump and tank would be the ideal fix. This adds a separate, dedicated pump for the sprayer that's run off of the rear PTO. Might be tricky figuring out where to mount the hydraulic oil resevoir though.

Something like this for the pump depending on the GPM required to run the sprayer.
Surplus Center - 3.6 CU IN PRINCE HC-PTO-7A PTO PUMP 540 RPM

And one of these tanks again depending on how much oil the sprayer requires. A larger reservoir will allow the oil to run cooler. Surplus Center

If the OP is serious for this option, I would suggest he start a thread in the hydraulics section to get help with spec's and how to hook it all up.

 

[B3000]

Turning off the spray pump to use the 3pt hitch is not an option in this case. It's just not practical.

The spray pump needs a maximum of 4 gpm. It has its own needle valve bypass to set its operating speed. The B3000 tractor hydraulic system puts out 9.1 gpm.

That should be enough excess if I knew how to plumb in the correct control valve for the sprayer pump and not have it connected to the remotes.

Maybe this will never work, but its fun to try and figure it out!

 

[CHDinCT]

Turning off the spray pump to use the 3pt hitch is not an option in this case. It's just not practical.

The spray pump needs a maximum of 4 gpm. It has its own needle valve bypass to set its operating speed. The B3000 tractor hydraulic system puts out 9.1 gpm.

That should be enough excess if I knew how to plumb in the correct control valve for the sprayer pump and not have it connected to the remotes.

Maybe this will never work, but its fun to try and figure it out!

Just checked the Kubota web site and of your 9.1 GPM total flow, 3.9 GPM is dedicated to power steering with the remaining 5.2 available for all hydraulic functions. That would mean there'd be 1.2 GPM theoretically available for other functions besides the sprayer. But, I think once you send fluid to your sprayer, any excess may just go back to the tank, unless like stated above, you feather the valve. Don't know enough more to give you any advice on hydraulic solutions (other than the separate PTO pump) but someone who frequents the hydraulics forum above might. Good luck.

 

[J_J]

There are flow dividers to provide two outputs. Some are priority, and other dividers are equal flow for both outputs.

For instance, your sprayer needs 2 GPM, and your tractor pump puts out 6 GPM. Then since the sprayer will always get the 2 GPM priority flow, the other 4 GPM is available for the other hyd on the tractor.

If you decrease engine rpm, you will decrease the hyd for the other tractor functions.

You could also get a 12V pump for the sprayer. I have one of those pumps mounted on a 25 gal tank .

 

[aczlan]

If you put something like Surplus Center - 3/8" NPT 30 GPM ADJ PRIORITY DIVIDER VALVE RD537 inline before the 3 point valve, you can have 4gpm go to your sprayer through the priority port and the rest going to the 3 point valve.

Aaron Z