Kubota Hydraulics

[davisgary2]

I am attaching a Fisher MM1 plow to my Kubota L3200. I am having trouble figuring out the hydraulics. I used the single acting cylinder on the plow and attached to my loader valve and it goes up and down fine. I attempted to connect the single acting angle cylinders to the ports on the loader valve and they fight each other. I have to disconnect one line and remove the quick connect fitting to relieve the pressure. Very little knowledge of hydraulics here I thought I would have problems with the up down not the left right. Any help would be appreciated.

 

[KyleH]

Are you trying to use single acting cylinders for the angle of the blade? And you mention using the loader valve to control it, you have the loader removed?

 

[davisgary2]

Yes the loader is removed and I am trying to use the single acting pistons 1 Right 1 Left on the plow.

 

[sidecarist]

The kubota loader valve has a regeneration circuit on the curl function. as far as I know there is no way to disable it. The regeneration circuit is incompatible with the single acting angle cylinders on the plow.

I had this problem and wound up adding a separate valve for the angle functions it was powered by the power beyond port. It's been 20 years since I did it, and no longer have the tractor...

Not much direct help I guess, but hopefully helps you save some troubleshooting time.

 

[davisgary2]

Thanks I remember reading about regeneration but forgot the terminology. Will give me another place to start looking.

 

[KyleH]

Adding a third function valve would allow you to control the cylinders, but it may be cheaper/easier to find a double acting cylinder to take the place of the two single acting cylinders.

 

[davisgary2]

Just started reading on the regeneration. Seems to be a lot of post that indicate that putting in a double acting cylinder may not solve the problem and the cylinder may act funny ???

 

[MtnViewRanch]

Use the up-down of the joystick for the left-right motion of the plow and use the left right motion of the joystick for the up-down motion of the plow. Be sure to use the right hand curl motion as the down motion of the plow. This is not intuitive, but it costs you nothing and everything will work.

 

[davisgary2]

I will try that tomorrow thanks will let you know if it works out.

 

[LD1]

Dont know if/when kubota changed valves, but....on my old L3400....which was the predecessor to the L3200.......there was a second detent position for the curl circuit. When pushing the joystick to the right to "dump" the first position you come to is regen. Keep pushing further right, and its no longer regen.

My new MX5100 is a regen only valve, and would not work with a plow (or my grapple diverted).

SO try pushing a little harder to the right. IT may just work. IF there is nothing there though......use up and down for the blade angle as mentioned. Will be awkward to use at first, but you should get used to it pretty quickly.

 

[davisgary2]

Thanks for the replies. Apparently mine has regen all the way. Putting the angle hoses on the up down circuit and the lift piston on the curl worked fine. I will deal with that rather than adding a third function.
Thanks again for the help.

 

[LD1]

I wonder when kubota started doing that.

I like the regen feature alot for loader work....but would much prefer that 3rd position for normal operation. I have had my old L3400 stuck before and that was the only thing that saved me. Pushing backwards out was not an option. But was able to curl the bucket a bit, plant in the ground to lift the front axle, and dump to inch forward about a foot at a time. Regen didnt have the power to do it.

 

[cmhyland]

I use a double action cylinder for the blade angle on mine... I have a 7 myers plow cut down to 6ft and it's never been a problem.... so just using a single double action cylinder .... I use it off the loader controls of a 2000 B2910....

Regards,
Chris

 

[LD1]

I use a double action cylinder for the blade angle on mine... I have a 7 myers plow cut down to 6ft and it's never been a problem.... so just using a single double action cylinder .... I use it off the loader controls of a 2000 B2910....

Regards,
Chris

NOthing wrong with a DA cylinder to control angle, but there are a few downsides to be aware of.

1. Speed of the angle will be different. It will angle faster one direction and slower the other.
2. Along the same lines as speed, power will be different.
3. Cannot use a crossover style relief valve to protect the cylinders and hoses on a single DA setup.

 

[cmhyland]

NOthing wrong with a DA cylinder to control angle, but there are a few downsides to be aware of.

1. Speed of the angle will be different. It will angle faster one direction and slower the other.
2. Along the same lines as speed, power will be different.
3. Cannot use a crossover style relief valve to protect the cylinders and hoses on a single DA setup.

Hi LD1,
Speed in angle isn't enough of a difference to notice, Power is not a problem for me as it will angle from one side to the other rolling 2 ft of snow in front of it...
How does the crossover valve work?

Regards,
Chris

 

[LD1]

In a two cylinder setup with single acting cylinders, the crossover will dump oil from one cylinder to the other if you hit something too hard. It's typically adjustable. Set around 3000psi.

When you hit something with the edge of your plow, think about how a floor jack or bottle jack work. The cylinder becomes the little pumper, and the plow is the handle. Hit something with the edge, and that cause quite a bit of pressure in the cylinders and hoses.